AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON FEBRUARY 19, 1997

                                                REGISTRATION NO. 333-
================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   ----------

                                    FORM S-1
             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

                                   ----------

                            JENNER TECHNOLOGIES, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

                                   ----------


CALIFORNIA (PRIOR TO REINCORPORATION)
  DELAWARE (AFTER REINCORPORATION)
   (STATE OR OTHER JURISDICTION
 OF INCORPORATION OR ORGANIZATION)

                                      2834
                          (PRIMARY STANDARD INDUSTRIAL
                           CLASSIFICATION CODE NUMBER)
                                                               68-0292466
                                                            (I.R.S. EMPLOYER
                                                          IDENTIFICATION NUMBER)

                                   ----------

                       2010 CROW CANYON PLACE, SUITE 100
                          SAN RAMON, CALIFORNIA 94583
                                 (510) 824-3150
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINICIPAL EXECUTIVE OFFICES)

                                   ----------

                 ANTHONY E. MAIDA III, CHIEF EXECUTIVE OFFICER
                           JENNER TECHNOLOGIES, INC.
                       2010 CROW CANYON PLACE, SUITE 100
                          SAN RAMON, CALIFORNIA 94583
                                 (510) 824-3150
       (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING
                        AREA CODE, OF AGENT FOR SERVICE)

                                   ----------

                                   COPIES TO:
  BLAIR W. STEWART, JR., ESQ.                       LAWRENCE B. FISHER, ESQ. 
     TIMOTHY STEVENS, ESQ.                   ORRICK, HERRINGTON & SUTCLIFFE LLP
WILSON SONSINI GOODRICH & ROSATI                       666 Fifth Avenue       
    Professional Corporation                     New York, New York 10103-0001  
       650 Page Mill Road                               (212) 506-5000          
  Palo Alto, California 94304                     
         (415) 493-9300                                                      
                                        
                                   ----------
                     
    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:  As soon as
practicable after the effective date of this Registration Statement.

    If any of the securities  being registered on this Form are to be offered on
a delayed or continuous  basis  pursuant to Rule 415 under the Securities Act of
1933, check the following box. [x]

    If this Form is filed to  register  additional  securities  for an  offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list  the  Securities  Act  registration  statement  number  of the  earlier
effective registration statement for the same offering. [ ]

    If this Form is a  post-effective  amendment  filed  pursuant to Rule 462(c)
under the  Securities  Act,  check the following box and list the Securities Act
registration  statement number of the earlier effective  registration  statement
for the same offering. [ ]

    If delivery of the prospectus is expected to be made pursuant to Rule
434, please check the following box. [ ]




                                             CALCULATION OF REGISTRATION FEE
=============================================================================================================================

  TITLE OF EACH CLASS             AMOUNT              PROPOSED MAXIMUM         PROPOSED MAXIMUM            AMOUNT OF
  OF SECURITIES TO BE             TO BE               OFFERING PRICE              AGGREGATE              REGISTRATION
      REGISTERED               REGISTERED(1)            PER SHARE(2)          OFFERING PRICE(2)               FEE
- -----------------------------------------------------------------------------------------------------------------------------
                                                                                              
Common Stock, par
value .001 per
share(3)                        2,875,000                 $ 8.00                 $23,000,000              $  6,969.70
- -----------------------------------------------------------------------------------------------------------------------------
Redeemable Common
Stock Purchase
Warrants(4)                     2,875,000                 $  .10                 $   287,500              $     87.12
- -----------------------------------------------------------------------------------------------------------------------------
Common Stock, par
value .001 per share,
issuable on exercise
of Redeemable Common
Stock Purchase
Warrants(5)                     2,875,000                 $11.20                 $32,200,000              $  9,757.58
- -----------------------------------------------------------------------------------------------------------------------------
Representative's
Warrants(6)                       250,000                 $.0001                 $        25                  --
- -----------------------------------------------------------------------------------------------------------------------------
Redeemable Common
Stock Purchase
Warrants issuable upon
exercise of
Representative's
Warrants                           250,000                 $  .14                 $    35,000              $     10.61
- -----------------------------------------------------------------------------------------------------------------------------
Common Stock, par
value .001 per share,
issuable upon exercise
of Redeemable Common
Stock Purchase
Warrants issuable upon
exercise of
Representative's
Warrants                           250,000                 $11.20                 $ 2,800,000              $    848.48
- -----------------------------------------------------------------------------------------------------------------------------
Common Stock, par
value .001 per share,
issuable upon exercise
of Representative's
Warrants(7)                        250,000                 $11.20                 $ 2,800,000              $    848.48
- -----------------------------------------------------------------------------------------------------------------------------
   TOTAL                            N/A                     N/A                   $61,122,525              $ 18,521.97
=============================================================================================================================

                                            (Footnotes appear on following page)

    THE  REGISTRANT  HEREBY AMENDS THIS  REGISTRATION  STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER  AMENDMENT  WHICH  SPECIFICALLY  STATES  THAT  THIS  REGISTRATION
STATEMENT SHALL  THEREAFTER  BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE  SECURITIES  ACT OF 1933 OR UNTIL THE  REGISTRATION  STATEMENT  SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION,  ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.

================================================================================





(continued from previous page)
(1) Pursuant  to Rule  416,  there are also  being  registered  such  additional
    securities as may become issuable pursuant to the antidilution provisions of
    the Warrants, the Representative's  Warrants and the Warrants underlying the
    Representative's Warrants.
(2) Estimated solely for the purpose of computing the amount of the registration
    fee pursuant to Rule 457.
(3) 2,500,000 shares of Common Stock and 2,500,000 Warrants are being registered
    under this  Registration  Statement.  For  purposes  of  calculation  of the
    registration  fee,  each  share of Common  Stock has been  assumed to have a
    proposed  maximum offering price of $8.00, and each Warrant has been assumed
    to have a proposed  maximum  offering price of $0.10.  Also includes 375,000
    shares of Common Stock which the Underwriters have the option to purchase to
    cover over-allotments, if any.
(4) Includes 375,000 Warrants which the Underwriters have the option to purchase
    to cover over-allotments, if any.
(5) Includes  375,000  shares of Common Stock issuable upon exercise of Warrants
    which the Underwriters have the option to purchase to cover over-allotments,
    if any.
(6) In connection with the Registrant's  sale of the Securities  offered hereby,
    the Registrant is granting to the Representative of the several Underwriters
    (the  "Representative")   warrants  (the  "Representative's   Warrants")  to
    purchase  250,000  shares of  Common  Stock  and/or  250,000  Warrants.  The
    purchase price per Representative's Warrant is $.0001.
(7) The maximum exercise price of the  Representative's  Warrants will be $11.20
    per share of Common Stock and $.14 per Warrant based on the proposed maximum
    offering price of $8.00 per share of Common Stock and $0.10 per Warrant.








Information   contained  herein  is  subject  to  completion  or  amendment.   A
registration  statement  relating  to these  securities  has been filed with the
Securities  and Exchange  Commission.  These  securities may not be sold nor may
offers to buy be accepted prior to the time the registration  statement  becomes
effective.  This  prospectus  shall  not  constitute  an  offer  to  sell or the
solicitation of an offer to buy nor shall there be any sale of these  securities
in any State in which such offer,  solicitation  or sale would be unlawful prior
to registration or qualification under the securities laws of any such State.










                 SUBJECT TO COMPLETION, DATED FEBRUARY 19, 1997


PROSPECTUS
- ----------

                                  [Logo]

                         JENNER TECHNOLOGIES, INC.

                   2,500,000 SHARES OF COMMON STOCK AND
            2,500,000 REDEEMABLE COMMON STOCK PURCHASE WARRANTS

    Jenner  Technologies,  Inc.  ("Jenner" or the "Company")  hereby offers (the
"Offering")  2,500,000  shares (the "Shares") of common stock,  $0.001 par value
(the "Common  Stock") and 2,500,000  redeemable  common stock purchase  warrants
(the "Warrants"). The Shares and Warrants are sometimes hereinafter collectively
referred to as the  "Securities."  The Shares and Warrants may only be purchased
together on the basis of one Share and one  Warrant,  but will trade  separately
immediately upon issuance.  Each Warrant entitles the registered  holder thereof
to purchase  one share of Common  Stock at an exercise  price of $____ per share
[140% of the initial public  offering price per share of Common Stock],  subject
to adjustment, at any time during the period commencing on _______________, 1998
[twelve months from the date of the Prospectus] until  __________________,  2002
[5 years after the date of this  Prospectus].  Commencing  ____________________,
1998 [18 months from the date of the  Prospectus],  the  Warrants are subject to
redemption  by the Company,  in whole but not in part, at $.10 per Warrant on 30
days' prior written notice  provided that the average closing sales price of the
Common  Stock as reported on the  American  Stock  Exchange  ("AMEX")  equals or
exceeds  $_______ per share [160% of the initial public offering price per share
of Common  Stock]  for any 20  trading  days  within a period of 30  consecutive
trading days ending on the fifth  trading day prior to the date of the notice of
redemption. See "Description of Securities -- Warrants."

    Prior to the Offering,  there has been no public market for the Common Stock
or the Warrants,  and there can be no assurance  that such a market will develop
after completion of the Offering, or if developed, that it will be sustained. It
is currently anticipated that the initial public offering prices will be between
$7.00 and $8.00 per Share and $.10 per Warrant.  For  information  regarding the
factors  considered in  determining  the initial  public  offering  price of the
Shares  and  Warrants  and the terms of the  Warrants,  see "Risk  Factors"  and
"Underwriting."  It is anticipated that the Shares and Warrants will be included
for  quotation on the American  Stock  Exchange  under the symbols JNR and JNRW,
respectively.

                                   ----------

THE  SECURITIES  OFFERED  HEREBY  INVOLVE A HIGH  DEGREE  OF RISK AND  IMMEDIATE
SUBSTANTIAL DILUTION. SEE "RISK FACTORS" COMMENCING ON PAGE 7 AND "DILUTION."

                                   ----------

    THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
     AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION, NOR HAS THE
      SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
          PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
              REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.



================================================================================
                                   PRICE TO     UNDERWRITING     PROCEEDS TO
                                    PUBLIC       DISCOUNT(1)      COMPANY(2)
- --------------------------------------------------------------------------------
Per Share                         $               $              $
- --------------------------------------------------------------------------------
Per Warrant                       $               $              $
- --------------------------------------------------------------------------------
Total(3)                          $               $              $
================================================================================


(1)  Does  not  include   additional   compensation   to   National   Securities
     Corporation,   the  representative  of  the  several   Underwriters,   (the
     "Representative")  in the form of a non-accountable  expense allowance.  In
     addition, see "Underwriting" for information concerning indemnification and
     contribution  arrangements  with the  Underwriters  and other  compensation
     payable to the Representative.

(2)  Before  deducting  estimated  expenses of $600,000  payable by the Company,
     excluding   the   non-accountable   expense   allowance   payable   to  the
     Representative.

(3)  The Company has granted to the Representative an option, exercisable within
     45 days after the date of this  Prospectus,  to purchase up to an aggregate
     of 375,000  additional  shares of Common  Stock and/or  375,000  additional
     Warrants upon the same terms and  conditions as set forth above,  solely to
     cover  over-allotments,  if any  (the  "Over-Allotment  Option").  If  such
     Over-Allotment  Option is  exercised  in full,  the total  Price to Public,
     Underwriting  Discount and Proceeds to the Company will be $______, $______
     and $_______, respectively. See "Underwriting."


    The Securities are being offered by the Underwriters, subject to prior sale,
when,  as and if delivered to and accepted by the  Underwriters,  and subject to
approval of certain  legal matters by their counsel and subject to certain other
conditions.  The  Underwriters  reserve the right to withdraw,  cancel or modify
this  Offering and to reject any order in whole or in part.  It is expected that
delivery of the Securities  offered hereby will be made against payment therefor
at the offices of National  Securities  Corporation,  Seattle,  Washington on or
about _______________, 1997.

                         NATIONAL SECURITIES CORPORATION

               THE DATE OF THIS PROSPECTUS IS_____________, 1997.









                         [INSERT 4/COLOR GRAPHICS HERE]

                 [Description of Photo and Copy of Text Follows]



                              JENNER'S APPROACH TO
                 TREATMENT OF PATIENT WITH MINIMAL TUMOR BURDEN

    [Photo of Patient with Cancer in stages with and without Immunotherapy]

Current treatments for cancers that have spread are not very effective.  Despite
significant  improvements  in early  diagnosis and in surgical  treaments,  many
surgically treated patients experience recurrence of cancer.  Jenner's principal
product  candidates are designed to delay or prevent the recurrence of cancer by
stimulating the body's own immune system to attack microscopic disease remaining
after a patient has undergone tradional therapy.









    The Company's products are in a development stage and have not been approved
by the  United  States  Food  and Drug  Administration  ("FDA")  or any  foreign
regulatory authority for marketing in any country. Such approval is not expected
to be forthcoming for several years, and may not be received at all.

    IN CONNECTION WITH THIS OFFERING,  THE UNDERWRITERS MAY OVER-ALLOT OR EFFECT
TRANSACTIONS  WHICH  STABILIZE  OR MAINTAIN THE MARKET PRICE OF THE COMMON STOCK
AND THE  WARRANTS  OFFERED  HEREBY AT LEVELS  ABOVE THAT WHICH  MIGHT  OTHERWISE
PREVAIL IN THE OPEN MARKET.  SUCH  TRANSACTIONS  MAY BE EFFECTED ON THE AMERICAN
STOCK EXCHANGE OR OTHERWISE. SUCH STABILIZING, IF COMMENCED, MAY BE DISCONTINUED
AT ANY TIME.

    The Company intends to furnish to its stockholders annual reports containing
financial statements audited by its independent certified public accountants and
quarterly reports  containing  unaudited  interim  financial  statements for the
first three quarters of each fiscal year.







- --------------------------------------------------------------------------------

                               PROSPECTUS SUMMARY

    This Prospectus contains  forward-looking  statements.  Such forward-looking
statements include, but are not limited to, the Company's expectations regarding
its future  financial  condition and  operating  results,  product  development,
business and growth strategy, market conditions and competitive environment. The
Company's actual results could differ materially from those anticipated in these
forward-looking  statements as a result of certain factors,  including those set
forth under "Risk  Factors" and  elsewhere  in this  Prospectus.  The  following
summary is qualified in its entirety by the more  detailed  information  and the
Financial  Statements and Notes thereto appearing  elsewhere in this Prospectus.
Unless otherwise  indicated,  all information in this Prospectus (i) assumes the
Underwriter's   over-allotment   option  is  not  exercised,   (ii)  reflects  a
1-for-1.7328  reverse stock split of the  Company's  Common Stock to be effected
prior to the  closing  of the  Offering,  (iii)  assumes  the  Warrants  and the
warrants to purchase  250,000  shares of Common  Stock and/or  250,000  Warrants
issued  to  the   Representative   in   connection   with  this   Offering  (the
"Representative's Warrants") are not exercised, (iv) assumes the reincorporation
of the Company in Delaware prior to the closing of the Offering, and (v) assumes
the  conversion of all  outstanding  shares of the Company's  Series A Preferred
Stock and Series B Preferred Stock into 1,510,015 shares of the Company's Common
Stock upon the closing of the Offering.

                                THE COMPANY

    Jenner Technologies,  Inc. ("Jenner" or the "Company"),  a development stage
company, is engaged in the development of immunotherapies to treat patients with
cancer and certain side effects  related to  chemotherapy.  The Company has four
product candidates under development, two of which are in clinical trials. Three
of the  Company's  product  candidates  are  designed  to delay or  prevent  the
recurrence  of cancer by  stimulating  the body's  own  immune  system to attack
microscopic disease remaining after a patient has undergone traditional therapy.
The  Company's  product  candidates  consist of macrophage  activators  (ACT and
JT3002)  and  therapeutic  vaccines  (OncoVax-P  and  OncoVax-CL).  The  Company
acquired the technology related to ACT and JT3002 through an exclusive worldwide
license with  Novartis AG (the company  resulting  from the merger of Ciba-Geigy
Limited and Sandoz,  Ltd.) ("Novartis").  In addition,  the Company acquired the
rights to produce  the  antigen  related to  OncoVax-P  through a  non-exclusive
license with Research Corporation Technologies,  Inc. and the antigen related to
OncoVax-CL through an exclusive worldwide license with Eli Lilly & Company.

    ACT is in a nationwide  Phase III  clinical  trial as a therapy for patients
with  osteogenic  sarcoma  (bone  cancer).  The  study  calls for a total of 645
patients  to be  treated  under the  protocol  and,  as of  December  31,  1996,
approximately  540 patients had entered the study. ACT utilizes a small molecule
that has the capacity to activate  macrophages,  which are scavenger  cells that
are part of the immune system.  Once activated,  macrophages acquire the ability
to seek out and  destroy  tumor  cells.  ACT  utilizes a  proprietary  liposomal
formulation  to  deliver  its  active  ingredients  (liposomes  are  spheres  of
subcellular size composed primarily of fat molecules).  JT3002 is in preclinical
evaluation as a therapy for mucositis (damage to the gastrointestinal  mucosa or
lining of the gut), a side effect  commonly  associated with  chemotherapy.  The
Company intends to file an Investigational New Drug application ("IND") with the
United States Food and Drug Administration ("FDA") in late 1997 or early 1998 to
commence  Phase I  clinical  trials of  JT3002,  subject  to the  results of the
preclinical evaluation.

    OncoVax-P is in limited Phase I/II clinical trials in patients with prostate
cancer.  The Company intends to commence a limited Phase I/II clinical trial for
OncoVax-CL in patients with colorectal  cancer in the first quarter of 1997. The
Company's Phase I/II clinical trials are conducted in a small number of patients
(5-6) to gain  preliminary  information  regarding  safety  of the  vaccine  and
ability to generate an immune response.  OncoVax-P and OncoVax-CL each include a
genetically  engineered  version of a tumor associated  antigen which represents
the "identity  tag" of the cancer cell combined with an adjuvant  which enhances
the body's immune  response.  The antigen and adjuvant are packaged in liposomes
which are taken up by antigen

- --------------------------------------------------------------------------------

                                       3





- --------------------------------------------------------------------------------

presenting  cells.  The Company believes this approach will induce a more robust
relevant  immune  response  than if the liposomal  delivery  system is not used.
Based on  preclinical  data, the Company  believes that  OncoVax-CL may have the
potential for application in cancer  indications  other than colorectal  cancer,
such as lung, pancreatic and ovarian cancer.

    In an effort to leverage the Company's resources and better manage the risks
and costs inherent in scientific  research and new product  development,  Jenner
has  followed a business  strategy  of (i)  in-licensing  promising  proprietary
technologies for which substantial preclinical and/or clinical studies have been
undertaken,  (ii) focusing on human clinical trials to gain relevant information
rather  than   developing   animal   models,   and  (iii)   engaging   qualified
subcontractors  to perform  research  and  development  functions.  Through this
business  strategy,  the Company has expended only approximately $4.0 million in
cash through  December 31, 1996 to develop its current  product  candidates  and
believes it has extended its research efforts to a larger number of applications
than would otherwise be the case given its limited resources.

    The Company believes that its business strategy and management  capabilities
may enable it to shorten the time frame for commercializing its products. As the
Company's product candidates advance through the regulatory process, the Company
generally intends to establish strategic alliances with pharmaceutical companies
and other corporate partners with large distribution  systems to market and sell
the Company's products worldwide.  In some cases,  however,  where the customers
for a product are easily  identified and  concentrated,  the Company  intends to
market and distribute the product through a direct sales force.

    Jenner was  incorporated  as a California  corporation  in December 1992 and
expects to reincorporate in Delaware prior to consummation of this Offering. The
Company's  principal  offices are located at 2010 Crow Canyon Place,  Suite 100,
San Ramon, California 94583, and its telephone number is (510) 824-3150.






- --------------------------------------------------------------------------------


                                       4




- --------------------------------------------------------------------------------

                                  THE OFFERING

Securities Offered....... 2,500,000   Shares  of   Common  Stock  and  2,500,000
                            Warrants.  The  Shares  and  the  Warrants  will  be
                            separately  transferable  immediately  following the
                            completion of this Offering.

Exercise Price of
  Warrants............... Each Warrant  entitles the  registered  holder thereof
                            to purchase, at any time over a four (4) year period
                            commencing  one  (1)  year  after  the  date of this
                            Prospectus,  one share of Common Stock at a price of
                            $ per share  [140% of the  initial  public  offering
                            price per  Share].  The  Warrant  exercise  price is
                            subject to adjustment  under certain  circumstances.
                            See "Description of Securities."

Redemption of Warrants... Commencing  eighteen   (18) months  after  the date of
                            this   Prospectus,   the  Warrants  are  subject  to
                            redemption  by the  Company at $0.10 per  Warrant on
                            thirty  (30)  days'  prior  written  notice  to  the
                            warrant  holders if the average  closing sales price
                            of the  Common  Stock  equals or exceeds $ per share
                            [160% of the initial public offering price per Share
                            of Common  Stock] for any twenty (20)  trading  days
                            within a period of thirty (30)  consecutive  trading
                            days  ending on the fifth  trading  day prior to the
                            date of the notice of redemption.  See  "Description
                            of Securities."

Common Stock Outstanding
 Prior to the Offering(1). 4,621,886 Shares

Common Stock Outstanding
  After the Offering(1)... 7,121,886 Shares

Use of Proceeds........... For  research  and  development,   clinical   trials,
                            purchase of equipment,  working  capital and general
                            corporate purposes. See "Use of Proceeds."

Risk Factors and Dilution. An  investment  in  the   securities  offered  hereby
                            involves  a high  degree of risk and  immediate  and
                            substantial  dilution  to  the  purchasers  in  this
                            Offering. See "Risk Factors" and "Dilution."

Proposed AMEX Symbols(2):

 Common Stock ........... JNR

 Warrants ............... JNRW


- ----------
(1) Excludes   378,114   shares  of  Common  Stock  issuable  upon  exercise  of
    outstanding  non-plan stock options and  outstanding  stock options  granted
    under the Company's  1993  Incentive  Stock Plan as of January 31, 1997 at a
    weighted  average  exercise price of $0.90 per share,  and 350,000 shares of
    Common Stock  reserved for issuance under the Company's 1997 Stock Plan. See
    "Management -- Employee Benefit Plans."

(2) Application has been made for listing of the Common Stock and the
    Warrants on AMEX.

    Jenner(tm) and ACT (tm) are trademarks of the Company. The Company has filed
an application to register JennerTech(tm) as a trademark of the Company.


- --------------------------------------------------------------------------------

                                       5



- --------------------------------------------------------------------------------

                          SUMMARY FINANCIAL INFORMATION








                                                                 
                                             PERIOD FROM                                          PERIOD FROM
                                              INCEPTION                                            INCEPTION
                                            (DECEMBER 8,                                         (DECEMBER 8,
                                              1992) TO        YEAR ENDED DECEMBER 31,              1992) TO
                                             DECEMBER 31,  ----------------------------------     DECEMBER 31,
                                                1993          1994        1995         1996          1996
                                                ----          ----        ----         ----          ----
STATEMENT OF OPERATIONS DATA:
                                                                                       
Revenues                                      $  --        $   --      $   --      $    --        $    --
Research and development expenses               338,626      499,366     698,303     2,206,900      3,743,195
General and administrative expenses             137,325      228,114     195,663       339,948        901,050
                                              ---------    ---------   ---------   -----------    -----------
Loss from operations                           (475,951)    (727,480)   (893,966)   (2,546,848)    (4,644,245)
Interest income (expense)                         9,037       22,369      17,100      (140,987)       (92,481)
                                              ---------    ---------   ---------   -----------    ----------- 
Net loss                                      $(466,914)   $(705,111)  $(876,866)  $(2,687,835)   $(4,736,726)
                                              =========    =========   =========   ===========    =========== 
Pro forma net loss per share(1)                                                    $     (0.56)
                                                                                   =========== 
Shares used to compute pro forma net loss
  per share(1)                                                                       4,785,863
                                                                                   ===========





                                                                                     DECEMBER 31, 1996
                                                                                  -------------------------
                                                                                                   AS
                                                                                   ACTUAL      ADJUSTED(2)
                                                                                   ------     -----------
                                                                                        
BALANCE SHEET DATA:
Working capital                                                                $  1,317,447    $ 17,697,447
Total assets                                                                      1,563,392      17,943,392
Note payable to principal stockholder                                             3,000,000       3,000,000
Deficit accumulated during the development stage                                 (4,736,726)     (4,736,726)
Total stockholders' equity (deficit)                                             (1,852,170)     14,527,830



- ----------
(1)  See Note 1 of Notes  to  Financial  Statements  for an  explanation  of the
     determination  of the number of shares  used to compute  pro forma net loss
     per share.

(2)  Adjusted to give effect to the receipt of the estimated net proceeds
     of the Offering based upon an assumed initial public offering price
     of $7.50 per Share and $.10 per Warrant. See "Use of Proceeds" and
     "Capitalization."



- --------------------------------------------------------------------------------

                                       6






                                  RISK FACTORS

    An investment in the  Securities  offered  hereby  involves a high degree of
risk. In addition to the other  information  contained in this  Prospectus,  the
following risk factors should be considered  carefully in evaluating the Company
and its business before  purchasing the Securities  offered hereby.  Prospective
investors  should be in a position to risk the loss of their entire  investment.
This  Prospectus  contains  forward-looking   statements.  Such  forward-looking
statements include, but are not limited to, the Company's expectations regarding
its future  financial  condition and  operating  results,  product  development,
business and growth strategy, market conditions and competitive environment. The
Company's actual results could differ materially from those anticipated in these
forward-looking  statements as a result of certain factors,  including those set
in the following risk factors and elsewhere in this Prospectus.

DEVELOPMENT STAGE COMPANY; LIMITED OPERATING HISTORY; NO REVENUES AND NO
ASSURANCE OF PROFITABILITY

    The Company is in the development stage and is subject to all business risks
associated  with a new enterprise,  including  uncertainties  regarding  product
development, constraints on the Company's financial and personnel resources, and
dependence on and need for third party relationships.  At December 31, 1996, the
Company had an accumulated  deficit of approximately  $4.7 million.  The Company
anticipates  that it will  continue to incur  substantial  additional  operating
losses for at least the next  several  years and  expects  cumulative  losses to
increase as the Company's  research and development  efforts expand. The Company
has a limited history of operations  consisting  primarily of development of its
products and  sponsorship of research and clinical  trials.  The Company has not
generated  any revenue to date,  whether  from  product  sales,  license fees or
research funding, and there can be no assurance as to when or whether it will be
able  to  develop  sources  of  revenue  or  that  its  operations  will  become
profitable,  even if it is able to commercialize any products. See "Management's
Discussion and Analysis of Financial Condition and Results of Operations."

NO ASSURANCE OF SUCCESSFUL PRODUCT DEVELOPMENT OR COMMERCIALIZATION;
UNCERTAINTIES RELATED TO CLINICAL TRIALS

    The Company's  research and  development  programs are at various  stages of
development,  ranging from the preclinical  stage to Phase III clinical  trials.
Substantial  additional  research and development will be necessary in order for
the  Company  to  develop  and  obtain  regulatory   approval  for  its  product
candidates,  and there  can be no  assurance  that the  Company's  research  and
development  will lead to  development of products that are shown to be safe and
effective in clinical trials and that are  commercially  viable.  In addition to
further research and development,  the Company's product candidates will require
clinical  testing,   regulatory   approval  and  development  of  marketing  and
distribution  channels,  all  of  which  are  expected  to  require  substantial
additional investment prior to commercialization. There can be no assurance that
the Company's  products  will be  successfully  developed,  prove to be safe and
efficacious in clinical trials, meet applicable regulatory standards, be capable
of being produced in commercial  quantities at acceptable costs, be eligible for
third party reimbursement from governmental or private insurers, be successfully
marketed or achieve market acceptance. Further, the Company's products may prove
to have  undesirable or unintended  side effects that may prevent or limit their
commercial use.

    The Company may find,  at any stage of its  research and  development,  that
products which appeared promising in preclinical studies or Phase I and Phase II
clinical trials do not demonstrate  efficacy in larger-scale  Phase III clinical
trials and do not receive  regulatory  approvals.  The results from  preclinical
testing and early clinical  trials may not be predictive of results  obtained in
later clinical trials and large-scale  testing.  Companies in the pharmaceutical
and  biotechnology  industries  have  suffered  significant  setbacks in various
stages of clinical  trials,  even in advanced  clinical  trials after  promising
results  had  been  obtained  in  earlier  trials.   Accordingly,   any  product
development  program  undertaken by the Company may be curtailed,  redirected or
eliminated at any time. The rate of completion of the Company's  clinical trials
may be  delayed by many  factors,  including  slower  than  anticipated  patient
enrollment,  difficulty  in  securing  sufficient  supplies  of  clinical  trial
materials or adverse events occurring during the clinical trials.  Completion 



                                       7



of testing,  studies and trials may take several  years,  and the length of time
varies substantially with the type, complexity,  novelty and intended use of the
product. In addition, data obtained from preclinical and clinical activities are
susceptible  to varying  interpretations,  which could  delay,  limit or prevent
regulatory  approval.  Delays or rejections may be  encountered  based upon many
factors,  including  changes in  regulatory  policy during the period of product
development.  No assurance  can be given that any of the  Company's  development
programs  will be  successfully  completed,  that any  Investigational  New Drug
application  ("IND") will become  effective or that  additional  clinical trials
will be allowed by the United  States  Food and Drug  Administration  ("FDA") or
other  regulatory  authorities or that clinical trials will commence as planned.
In addition,  there have been delays in the  Company's  testing and  development
schedules  to date and there can be no  assurance  that the  Company's  expected
testing  and  development  schedules  will be met which  could  have a  material
adverse effect on the Company.  See "Business -- Jenner's Product Candidates and
Clinical Trials."

DEPENDENCE ON THIRD PARTY MANUFACTURING; RISKS OF CHANGING MANUFACTURING
SOURCES

    The Company relies on third parties for the  manufacture of products used in
clinical  trials.  The Company  anticipates  that current  manufacturers  of its
product   candidates  will  not  necessarily   manufacture  these  products  for
subsequent clinical trials, and will not manufacture the products for commercial
use  should  the  clinical  trials be  successful  and  regulatory  approval  be
obtained.  As a result, the Company will need to obtain alternate  manufacturing
sources  for  its  products.   Applicable   regulations  require  that,  if  the
manufacturing  source of products such as the  Company's  vaccines or macrophage
activators is changed,  equivalency must be demonstrated  before patients can be
treated  with  product  from the new  manufacturer.  The  demonstration  of such
equivalency may require that additional  clinical trials be conducted.  There is
no assurance  that the Company will be able to demonstrate  equivalency  and the
effort to do so may  require  significant  expenditures  of money and time which
could  have  a  material  adverse  effect  on  the  Company.  See  "Business  --
Manufacturing and Supply."

DEPENDENCE ON AND NEED FOR THIRD PARTY RELATIONSHIPS

    The Company  follows a business  strategy of  utilizing  the  expertise  and
resources of third parties in a number of areas,  including the  manufacture  of
vaccines and  macrophage  activators  and their  components,  and the conduct of
preclinical and clinical  trials.  This strategy creates risks to the Company by
placing critical aspects of the Company's business in the hands of third parties
whom  the  Company  may  not be  able  to  control  as  effectively  as its  own
operations.  Moreover,  in reliance on these relationships,  the Company has not
developed its own resources to the extent these  activities have been contracted
to third  parties.  Currently,  the Company relies on these third parties as the
sources of supply for their  respective  products  or  services.  If these third
parties do not  perform in a timely and  satisfactory  manner,  the  Company may
incur  additional  costs and lose time in the  conduct  of its  development  and
clinical  programs as it seeks alternate  sources of such products and services,
if  available.  The effect of such costs and delays may have a material  adverse
effect on the Company. See "Business -- Business Strategy."

    The Company may seek additional third party  relationships in certain areas,
particularly  in  situations  in which the Company  believes  that the  clinical
testing,  marketing,  manufacturing  and  other  resources  of a  pharmaceutical
company  collaborator will enable the Company to develop particular  products or
geographic  markets which are otherwise  beyond the Company's  resources  and/or
capabilities.  There is no assurance that the Company will be able to obtain any
such  collaboration,  or any other research and development,  manufacturing,  or
clinical  trial  agreement.  The inability of the Company to obtain and maintain
satisfactory relationships with third parties may have a material adverse effect
on the Company.

NEED FOR SUBSTANTIAL ADDITIONAL FUNDS

    The Company's  operations to date have consumed  substantial  and increasing
amounts of cash. The negative cash flow from  operations is expected to continue
and  to  accelerate  in  the  foreseeable   future.  The  Company  will  require
substantial  funds of its own, or from third  parties,  to conduct  research and
development,  preclinical  and  clinical  testing  and to  manufacture  (or have
manufactured) and market (or have marketed) its product candidates.  The Company
estimates  that its current cash  resources and the


                                       8



net  proceeds of the  Offering  will be  sufficient  to meet its  operating  and
capital  requirements  for at least  12  months  following  the  closing  of the
Offering.  However,  the Company's cash  requirements  may vary  materially from
those now planned  because of results of research  and  development,  results of
preclinical  and  clinical  testing,   relationships   with  possible  strategic
partners,  changes in the focus and  direction  of the  Company's  research  and
development programs, competitive and technological advances, the FDA regulatory
process and other factors. The net proceeds of this Offering are not expected to
be sufficient to fund the Company's operations through the  commercialization of
one or more  products  yielding  sufficient  revenues to support  the  Company's
operations;  therefore, the Company is likely to need to raise additional funds.
The Company may seek to satisfy its future funding  requirements  through public
or private  offerings of securities,  with  collaborative or other  arrangements
with major pharmaceutical companies or from other sources.  Additional financing
may not be  available  when needed or on terms  acceptable  to the  Company.  If
adequate financing is not available,  the Company may not be able to continue as
a going concern, or may be required to delay, scale back or eliminate certain of
its research and development  programs,  to relinquish  rights to certain of its
technologies  or product  candidates,  to forego  desired  opportunities,  or to
license third parties to commercialize products or technologies that the Company
would  otherwise  seek to  develop  itself.  To the extent  the  Company  raises
additional  capital by issuing  equity  securities,  ownership  dilution  to the
investors  in this  Offering  will  result.  See  "Management's  Discussion  and
Analysis of Financial  Condition and Results of Operations"  and Note 1 of Notes
to Financial Statements.

NO MANUFACTURING, MARKETING OR SALES

    The Company currently has no marketing and sales resources or personnel.  In
the event the Company  successfully  completes  the  regulatory  process for the
introduction of a vaccine or macrophage activator product, the Company will need
to  establish   distribution,   marketing  and  sales   resources  in  order  to
commercialize such product.  Depending upon the product, the Company may seek to
develop its own  distribution,  marketing  and sales  resources,  or may seek to
enter a  collaborative  agreement with a major  pharmaceutical  company for such
purposes.  There is no assurance  that the Company will be  successful in either
situation. The inability of the Company to successfully  distribute,  market and
sell products will adversely  affect the  commercial  value of such products and
may adversely affect the financial position of the Company. In view of the early
stage of  development  of the  Company's  potential  products and the  Company's
limited resources,  the Company does not anticipate  spending a material portion
of  the  net  proceeds  of  this  Offering  to  acquire  resources  and  develop
capabilities in distribution, marketing or sales. See "Business -- Marketing and
Distribution."

    The Company does not have a manufacturing facility, and thus currently lacks
the resources or capability to manufacture  itself any of its product candidates
on a clinical or commercial  scale.  At the present time,  the Company  believes
that there are a number of facilities with FDA approval that have the capability
of  synthesizing  and  manufacturing   the  Company's   products  and  liposomal
formulations.  However,  the  process  for  manufacturing  and  formulating  the
Company's  products  is complex  and  subject to  uncertainties.  The Company is
currently, and will continue to be, dependent on third parties for manufacturing
clinical  and  commercial  scale  quantities  of its  products.  There can be no
assurance that the Company will be able to maintain existing  agreements for the
manufacturing of clinical quantities of products,  that it will be able to enter
into  additional  agreements  with other  third  parties  for  commercial  scale
manufacturing, or that contract manufacturers will be able to adequately produce
the Company's  products in commercial  quantities  in a  cost-effective  manner.
Interruptions  or  difficulties  in clinical  or  commercial  production  of the
Company's products may require the Company to incur substantial costs to address
the situation,  which could have a material adverse effect on the Company. See "
- --  Dependence  on Third Party  Manufacturing;  Risks of Changing  Manufacturing
Sources" and "Business -- Manufacturing and Supply."

    Contract  manufacturers must adhere to current Good  Manufacturing  Practice
("cGMP")  regulations  strictly  enforced by the FDA on an ongoing basis through
its facilities inspection program. Contract manufacturing facilities must pass a
pre-approval  plant  inspection  before the FDA will approve a Biologic  License
Application  ("BLA") or a Product License  Application ("PLA") and Establishment
License 

                                       9




Application  ("ELA"). Certain  material  manufacturing  changes that occur after
approval are also subject to FDA review and clearance or approval.  There can be
no assurance that the FDA or other regulatory  agencies will approve the process
or the  facilities by which any of the Company's  products may be  manufactured.
The Company's  dependence on third parties for the  manufacture  of products may
adversely  affect the  Company's  ability to develop and  deliver  products on a
timely and competitive basis. See " -- No Assurance of FDA Approval;  Government
Regulation" and "Business -- Government Regulation."

UNCERTAIN ABILITY TO PROTECT PATENTS AND PROPRIETARY INFORMATION

    The  pharmaceutical  and  biotechnology  fields are characterized by a large
number of patent filings,  and a substantial number of patents have already been
issued to other  pharmaceutical and biotechnology  companies.  Third parties may
have  filed  applications  for or  have  been  issued  patents  and  may  obtain
additional  patents and  proprietary  rights  related to  products or  processes
competitive  with or similar to those of the  Company.  The  Company  may not be
aware of all of the patents  potentially adverse to the Company's interests that
may have been issued to others.  No assurance  can be given that such patents do
not exist,  have not been filed, or could not be filed or issued,  which contain
claims relating to the Company's technology,  products or processes.  If patents
have been or are issued to others  containing  preclusive or conflicting  claims
and such  claims are  ultimately  determined  to be valid,  the  Company  may be
required  to obtain  licenses  to one or more of such  patents  or to develop or
obtain  alternate  technology.  There can be no assurance that the licenses that
might be required for the Company's  processes or products would be available on
commercially acceptable terms, or at all.

    Because  of the  substantial  length  of time and  expense  associated  with
bringing new products to the marketplace  through the development and regulatory
approval process, the biotechnology  industry places considerable  importance on
patent and trade secret protection for new technologies, products and processes.
Since patent  applications  in the United States are maintained in secrecy until
patents issue and since  publication  of discoveries in the scientific or patent
literature  often lag behind actual  discoveries,  the Company cannot be certain
that it (or any  licensor)  was the  first to make  the  inventions  covered  by
pending patent  applications  or that it (or any licensor) was the first to file
patent  applications  for such  inventions.  The patent positions of vaccine and
biotechnology  companies can be highly  uncertain and involve  complex legal and
factual  questions,  and therefore the breadth of claims  allowed in vaccine and
biotechnology patents or their enforceability, cannot be predicted. There can be
no assurance that any patents under pending patent  applications  or any further
patent applications will be issued. Furthermore,  there can be no assurance that
the  scope  of  any  patent  protection  will  exclude  competitors  or  provide
competitive  advantages to the Company,  that any of the Company's  patents that
have issued or may be issued will be held valid if  subsequently  challenged  or
that  others,  including  competitors  or  current  or former  employers  of the
Company's  employees,  advisors  and  consultants,  will not claim  rights in or
ownership to the patents and other proprietary rights held by the Company. There
can be no assurance  that others will not  independently  develop  substantially
equivalent  proprietary  information or otherwise obtain access to the Company's
proprietary  information  or that  others  may not be  issued  patents  that may
require  licensing  and the  payment of  significant  fees or  royalties  by the
Company.

    The Company currently  licenses several patents and patent  applications and
other technology that are integral to the Company's  products and business.  The
Company's  breach of any existing  license  agreement or the failure to obtain a
license to technology required to commercialize its products candidates may have
a material adverse effect on the Company. See "Business -- Licenses."

    The biotechnology  industry has experienced  extensive  litigation regarding
patent and other intellectual  property rights.  Accordingly,  the Company could
incur substantial costs in defending itself in suits that may be brought against
the Company claiming infringement of the patent rights of others or in asserting
the Company's  patent rights in a suit against  another  party.  The Company may
also be required to  participate  in  interference  proceedings  declared by the
United  States Patent and Trademark  Office for the purpose of  determining  the
priority of inventions in connection with the patent applications of the Company
or  other  parties.   Adverse   determinations  in  litigation  or  interference
proceedings  could  require  the  Company  to seek  licenses  (which  may not be
available  on  commercially   reasonable   terms)  or  subject  the  Company  to
significant  liabilities to third parties,  and could  therefore


                                       10




have a material  adverse effect on the Company.  Even if the Company prevails in
an interference  proceeding or a lawsuit,  substantial resources of the Company,
including the time and attention of its officers, will be required.

    The  Company  also  relies  on trade  secrets,  know-how  and  technological
advancement  to maintain  its  competitive  position.  Although the Company uses
confidentiality  agreements and employee  proprietary  information and invention
assignment  agreements  to  protect  its  trade  secrets  and  other  unpatented
know-how,  these  agreements  may be breached by the other party  thereto or may
otherwise be of limited effectiveness or enforceability.

     The  Company  is  aware  of a  company  that has  filed  an  intent  to use
application in the United States Patent and Trademark  Office for the mark "Onco
Vax" relating to  therapeutic  vaccines for  oncological  purposes.  The Company
believes that it has superior  rights to use "OncoVax" based upon its public use
of the mark in  technical  journals  prior to the  effective  filing date of the
intent to use  application.  However,  there can be no assurance in this regard,
and the Company may be required to discontinue using "OncoVax" as a name for its
products.

DEPENDENCE ON QUALIFIED PERSONNEL

    Because of the specialized  scientific nature of the Company's business, the
Company is highly  dependent  upon its ability to attract  and retain  qualified
scientific,  technical and managerial personnel. The loss of the Company's Chief
Executive  Officer,  Anthony E. Maida III, or its President and Chief Scientific
Officer,  Dr. Lynn E. Spitler,  would be highly detrimental to the Company.  The
Company  has an  employment  agreement  with  each  of  these  individuals.  See
"Management  -- Employment  Agreements."  Following  the  Offering,  the Company
expects to maintain key person  insurance for  $1,000,000 on the life of each of
Mr. Maida and Dr. Spitler.  The proceeds of such insurance may not be sufficient
to compensate the Company for the loss of the services of such  individuals  and
is not applicable in the case of resignation.  There is intense  competition for
qualified  personnel  in  the  biotechnology  field,  including  personnel  with
expertise  in product  candidate  identification,  licensing,  clinical  trials,
government  regulation,  manufacturing  marketing and sales, and there can be no
assurance  that the  Company  will be able to  continue  to  attract  and retain
qualified personnel  necessary for the development of its business.  The loss of
the services of existing  personnel as well as the failure to recruit additional
key scientific and technical  personnel in a timely manner could have a material
adverse effect on the Company.

RELATIONSHIPS OF SCIENTIFIC ADVISORS WITH OTHER ENTITIES

    The members of the  Company's  Scientific  Advisory  Board are employed on a
full-time basis by academic or research institutions.  Scientific Advisory Board
Members serve as consultants to the Company, and in some cases as consultants to
other  companies.  Accordingly,  Scientific  Advisory  Board members are able to
devote  only a portion  of their time to the  Company's  business  and  research
activities.  In addition,  except for work performed specifically for and at the
direction  of  the  Company,  the  inventions  or  processes  discovered  by the
Company's  Scientific  Advisory  Board  members and other  consultants  will not
become the  intellectual  property of the Company,  but will be the intellectual
property of their  institutions.  If the Company  desires  access to  inventions
which are not its  property,  it will be  necessary  for the  Company  to obtain
licenses to such inventions from the owners. In addition,  invention  assignment
agreements  executed by Scientific  Advisory  Board members and  consultants  in
connection  with  their  relationships  with the  Company  may be subject to the
rights  of their  primary  employers  or other  third  parties  with  whom  such
individuals have consulting relationships.  See "Business -- Scientific Advisory
Board."

COMPETITION

    There are many  companies,  both  publicly  and  privately  held,  including
well-known  pharmaceutical  companies,  as well as academic  and other  research
institutions, that are engaged in the discovery, development, marketing and sale
of products  for the  treatment  of cancer.  These  include  new  pharmaceutical
products  and  new  biologically   derived  products,   including  vaccines  and
macrophage activators.  The Company expects to encounter significant competition
for its product  candidates  from  traditional  and new treatment  methods.  The
Company  is  aware  of a  number  of  companies  that  have  products  based  on
immunoactivation principles or intended to treat the indications targeted by the
Company, including Avigen, Inc., Akzo Pharma Group, Aphton Corp., Biomira, Inc.,
Cell Genesys,  Inc., Cel-Sci  Corporation,  Centocor,  Inc., Corixa Corporation,
Cytel Corp.,  EndoRex Corp.,  Epigen,  Inc., IDEC Pharmaceutical  Corp., ImClone
Systems,  Inc.,  Janssen  Pharmaceuticals  (a  division  of Johnson &  Johnson),
Medarex,  Inc.,  Oncogene  Sciences,   Inc.,  RIBI  ImmunoChem  Research,  Inc.,
Schering-Plough Corp., Therion Biologics  Corporation,  Chiron Viagene, Inc. and
Vical, Inc. Janssen  Pharmaceuticals and Schering-Plough Corp. recently


                                       11





received  FDA  clearance  to market  products in the United  States for surgical
adjuvant  treatment of  colorectal  carcinoma and  melanoma,  respectively,  and
Centocor, Inc. recently received approval to market a product in Germany for the
adjuvant therapy of colorectal cancer.

    Most  of  the  Company's   competitors   and  potential   competitors   have
substantially greater capital,  research and development  capabilities and human
resources  than  the  Company.  Furthermore,  many  of  these  competitors  have
significantly  greater  experience  than the Company in undertaking  preclinical
testing and clinical trials of new biotechnology  products and obtaining FDA and
other regulatory  approvals.  If the Company is permitted to commence commercial
sales of any product, it will also be competing with companies that have greater
resources and experience in  manufacturing,  marketing and sales.  The Company's
competitors  may succeed in developing  products that are more  effective,  less
costly,  or have a better side effect  profile than any that may be developed by
the Company,  and such competitors may also prove to be more successful than the
Company  in  manufacturing,  marketing  and  sales.  If the  Company  is able to
successfully commercialize a product,  subsequent competitive developments could
render such product noncompetitive or obsolete. See "Business -- Competition."

TECHNOLOGICAL CHANGES AND UNCERTAINTY

    The Company's  research and  development  strategy is based upon advances in
recent years in the scientific  understanding of monoclonal antibodies,  genetic
engineering  and the human immune  system.  The  Company's  strategy  focuses on
techniques to stimulate  the body's  immune system to act against  cancer cells.
This area is the subject of  extensive  research  efforts  and rapid  scientific
progress.  New developments are expected to continue at a rapid pace in industry
and academia in both the specific  areas of interest to the Company and in other
areas  directed  at the  prevention  or  treatment  of  cancer.  There can be no
assurance that research and discoveries by others will not render some or all of
the Company's  proposed products  noncompetitive or obsolete.  In addition,  the
Company's  business strategy is subject to the risks inherent in the development
of new therapeutic products.  There can be no assurance that unforeseen problems
will  not  develop,  that  the  Company  will be able  to  address  successfully
technological  challenges it encounters in its research and development programs
or that  commercially  feasible  products  will  ultimately  be developed by the
Company. See "Business -- Competition."

NO ASSURANCE OF FDA APPROVAL; GOVERNMENT REGULATION

    All new drugs and biologics, including the Company's product candidates, are
subject  to  extensive  and  rigorous  regulation  by  the  federal  government,
principally the FDA under the Federal Food, Drug and Cosmetic Act and other laws
including,  in the case of  biologics,  the Public  Health  Services Act, and by
state and local governments.  Such regulations  govern,  among other things, the
development,  testing,  manufacture,  labeling,  storage, premarket clearance or
approval,  advertising,  promotion,  sale and distribution of such products.  If
drug products are marketed abroad, they also are subject to extensive regulation
by  foreign  governments.  Failure  to comply  with the FDA or other  applicable
regulatory  requirements may subject a Company to  administrative  or judicially
imposed sanctions such as civil penalties,  criminal  prosecution,  injunctions,
product seizure or detention,  product recalls,  total or partial  suspension of
production,  and FDA  refusal  to  approve  pending  BLAs,  PLAs  and  ELAs,  or
supplements to approved BLAs or PLAs/ELAs.

    The Company has not received regulatory approval in the United States or any
foreign jurisdiction for the commercial sale of any of its products. The process
of obtaining FDA and other  required  regulatory  approvals,  including  foreign
approvals,  often  takes  many years and can vary  substantially  based upon the
type,  complexity and novelty of the products involved and the indications being
studied.   Furthermore,   such  approval  process  is  extremely  expensive  and
uncertain.  There can be no assurance that the Company's product candidates will
be cleared for marketing by the FDA.  There can be no assurance that the Company
will have  sufficient  resources  to complete  the  required  regulatory  review
process,  or that the Company could overcome the inability to obtain,  or delays
in obtaining, such approvals. The failure of the Company to receive FDA approval
for its product candidates would preclude the Company from marketing and selling
its products in the United  States.  Therefore,  the failure to receive such FDA
approval would have a material adverse effect on the Company. Even if


                                       12


regulatory approval of a product is granted,  there can be no assurance that the
Company will be able to obtain the labeling  claims  necessary or desirable  for
the  promotion of those  products.  FDA  regulations  prohibit the  marketing or
promotion  of  a  drug  for  unapproved  indications.   Furthermore,  regulatory
marketing approval may entail ongoing requirements for postmarketing studies. If
regulatory  approval is  obtained,  the  Company  will be subject to ongoing FDA
obligations and continued  regulatory review. In particular,  the Company or its
third party  manufacturers  will be required  to adhere to  regulations  setting
forth  cGMPs,  which  require  that the  Company  or third  party  manufacturers
manufacture products and maintain records in a prescribed manner with respect to
manufacturing,  testing and quality control activities.  Further, the Company or
its  third  party  manufacturer  must  pass  a  preapproval  inspection  of  its
manufacturing facilities by the FDA before obtaining marketing approval. Failure
to comply with applicable  regulatory  requirements may result in penalties such
as restrictions  on a product's  marketing or withdrawal of the product from the
market.  In addition,  identification of certain side effects after a drug is on
the market or the occurrence of  manufacturing  problems could cause  subsequent
withdrawal  of  approval,  reformulation  of the  drug,  additional  preclinical
testing or clinical trials and changes in labeling of the product.

    Prior to the submission of a BLA or PLA/ELA,  drugs developed by the Company
must undergo  rigorous  preclinical and clinical  testing which may take several
years and the expenditure of substantial  resources.  Before commencing clinical
trials in humans, the Company must submit to the FDA and receive clearance of an
IND.  There can be no assurance  that  submission of an IND for future  clinical
testing of any product under development or other future products of the Company
would result in FDA permission to commence  clinical  trials or that the Company
will be able to obtain the necessary  approvals for future  clinical  testing in
any foreign jurisdiction. Success in preclinical studies or early stage clinical
trials does not assure  success in later stage  clinical  trials.  Data obtained
from   preclinical   and  clinical   activities   are   susceptible  to  varying
interpretations  which  could  delay,  limit  or  prevent  regulatory  approval.
Further,  there can be no  assurance  that if such  testing  of  products  under
development  is completed,  any such drug  compounds will be accepted for formal
review by the FDA or any  foreign  regulatory  body,  or approved by the FDA for
marketing  in the United  States or by any such  foreign  regulatory  bodies for
marketing in foreign  jurisdictions.  Future  federal,  state,  local or foreign
legislation  or  administrative  acts  could also  prevent  or delay  regulatory
approval of the Company's products. See "Business -- Government Regulation."

UNCERTAIN AVAILABILITY OF HEALTH CARE REIMBURSEMENT; HEALTH CARE REFORM

    The Company's ability to commercialize its product  candidates may depend in
part on the extent to which  reimbursement for the costs of such product will be
available from  government  health  administration  authorities,  private health
insurers  and others.  Significant  uncertainty  exists as to the  reimbursement
status of newly approved health care products.  There can be no assurance of the
availability  of adequate  third-party  insurance  reimbursement  coverage  that
enables the Company to  establish  and  maintain  price  levels  sufficient  for
realization  of an appropriate  return on its investment in developing  vaccines
and  biological   products.   Government  and  other   third-party   payors  are
increasingly  attempting to contain  health care costs by limiting both coverage
and the  level  of  reimbursement  for new  therapeutic  products  approved  for
marketing by the FDA and by refusing, in some cases, to provide any coverage for
uses of  approved  products  for disease  indications  for which the FDA has not
granted marketing  approval.  If adequate coverage and reimbursement  levels are
not provided by  government  and  third-party  payors for uses of the  Company's
product  candidates,  the market acceptance of these products would be adversely
affected.

    Health care reform proposals have been introduced in Congress and in various
state  legislatures.  It is currently  uncertain  whether any health care reform
legislation  will be enacted at the federal level, or what actions  governmental
and private  payors may take in response to the suggested  reforms.  The Company
cannot predict when any proposed  reforms will be  implemented,  if ever, or the
effect of any  implemented  reforms on the Company's  business.  There can be no
assurance that any implemented  reforms will not have a material  adverse effect
on the  Company.  Such  reforms,  if  enacted,  may affect the  availability  of
third-party  reimbursement for products  developed by the Company as well as the
price levels at which the Company is able to sell such products. In addition, if
the Company is able to commercialize products in overseas markets, the Company's
ability to achieve  success in such markets may depend,  in part,  on the health
care financing and reimbursement policies of such countries.

                                       13






RISK OF PRODUCT LIABILITY; UNCERTAINTY OF AVAILABILITY OF PRODUCT
LIABILITY INSURANCE

    The Company's business exposes it to potential product liability risks which
are inherent in the manufacturing,  clinical testing, marketing and use of human
therapeutic  products.  The Company  currently  carries clinical trial liability
insurance  in the  amount of $1  million  per  occurrence  and $1 million in the
aggregate,  although this insurance does not currently  cover the on-going Phase
III clinical trial for ACT.  There can be no assurance that the coverage  limits
of the Company's  insurance  policy will be adequate,  and a successful claim in
excess of the  coverage  limits  could  have a  material  adverse  effect on the
Company.  The Company plans to obtain product liability  insurance  covering the
commercial sale of its products prior to their commercial introduction, however,
there can be no  assurance  that the Company  will be able to obtain or maintain
such insurance on acceptable  terms or that any insurance  obtained will provide
adequate coverage against potential  liabilities.  Claims or losses in excess of
any liability  insurance  coverage now carried or  subsequently  obtained by the
Company could have a material adverse effect on the Company.

POTENTIAL ADVERSE EFFECT OF SHARES ELIGIBLE FOR FUTURE SALE

    Sales  of  Common  Stock  (including  shares  issued  upon the  exercise  of
outstanding  options) in the public market after this Offering could  materially
and adversely  affect the market price of the Securities.  Such sales also might
make  it  more   difficult  for  the  Company  to  sell  equity   securities  or
equity-related  securities  in the future at a time and price  that the  Company
deems appropriate.  Upon the completion of this Offering,  the Company will have
7,121,886 shares of Common Stock  outstanding  (not including  378,114 shares of
Common Stock  subject to  outstanding  options)  assuming no exercise of options
after  January 31,  1997 and  outstanding  warrants  to  purchase an  additional
2,500,000 shares of Common Stock,  assuming no exercise of the  Representative's
Warrant.  Of these securities,  2,500,000 shares of Common Stock and Warrants to
purchase  2,500,000  shares of Common Stock sold in this Offering will be freely
tradeable  (unless held by affiliates of the Company) without  restriction.  The
remaining  4,621,886 shares will be restricted  securities within the meaning of
the Securities  Act of 1933, as amended (the  "Securities  Act").  The Company's
directors,  executive officers and stockholders,  who in the aggregate hold 100%
of the shares of Common Stock of the Company  outstanding  immediately  prior to
the  completion of this  Offering,  have entered into lock-up  agreements  under
which they have agreed not to sell, directly or indirectly,  any shares owned by
them for a period of 12 months  after the date of this  Prospectus  without  the
prior written consent of the Representative. The Representative may, in its sole
discretion  and at any time  without  notice,  release all or any portion of the
shares  subject to such  lock-up  agreements.  Upon  expiration  of the 12-month
lock-up   agreements,   2,927,449   shares  of  Common   Stock  (not   including
approximately  228,403  shares subject to  outstanding  vested  options) held by
existing  stockholders will be eligible for immediate public resale,  subject in
some  cases to  volume  limitations  pursuant  to Rule  144,  and the  remaining
1,694,437 shares held by existing  stockholders  will become eligible for public
resale at various  times  over a period of less than two years,  subject in some
cases to vesting provisions and volume limitations. In addition, 12 months after
the  completion of this  Offering,  250,000 shares of Common Stock issuable upon
exercise of the  Representative's  Warrants and the Warrants to purchase 250,000
shares of Common Stock issuable upon exercise of the  Representative's  Warrants
will  be  available  for  sale.  Also,   1,860,680  of  the  shares  outstanding
immediately  following  the  completion  of this  Offering  will be  entitled to
registration  rights with  respect to such shares  upon  termination  of lock-up
agreements.  The number of shares sold in the public  market  could  increase if
registration  rights are exercised and such sales may have an adverse  effect on
the market price of the Common Stock.  See  "Description  of Capital  Stock" and
"Shares Eligible for Future Sale."

CONCENTRATION OF OWNERSHIP

    Upon  consummation  of this  Offering,  the  directors  and  officers of the
Company (and certain members of their families) will  beneficially own 4,529,387
shares of the Company's Common Stock or  approximately  63.6% of the outstanding
shares of Common Stock  following the completion of this Offering.  Accordingly,
the Company's  officers and directors  will have the ability to elect a majority
of the Company's  directors and otherwise  control the Company.  See  "Principal
Stockholders."

                                       14






IMMEDIATE SUBSTANTIAL DILUTION; DISPARITY OF CONSIDERATION

    Purchasers of Securities  in this  Offering  will  experience  immediate and
substantial  dilution  in the net  tangible  book  value of the shares of Common
Stock and Warrants purchased by them in this Offering. The immediate dilution to
purchasers of the Securities  offered hereby is $5.46 per share of Common Stock,
assuming  an  initial  public  offering  price of $7.50  per  share.  Additional
dilution to future net tangible book value per share may occur upon the exercise
of the  Warrants,  the  Representative's  Warrants  and  the  options  that  are
outstanding  or to be issued  under the  Company's  option  plans.  The  current
stockholders  of the Company,  including the Company's  officers and  directors,
acquired  their  shares  of  Common  Stock  for  nominal  consideration  or  for
consideration substantially less than the public offering price of the shares of
Common Stock offered hereby. As a result,  new investors will bear substantially
all of the risks inherent in an investment in the Company. See "Capitalization,"
"Dilution" and "Certain Transactions."

ANTI-TAKEOVER EFFECT OF DELAWARE LAW AND CERTAIN CHARTER AND BYLAWS
PROVISIONS

    Certain  provisions of Delaware law applicable to the Company could delay or
make more  difficult  a merger,  tender  offer or proxy  contest  involving  the
Company,  including  Section 203 of the Delaware General  Corporation Law, which
prohibits a Delaware  corporation from engaging in any business combination with
any interested  stockholder for a period of three years from the date the person
became an interested stockholder unless certain conditions are met. In addition,
the Board of  Directors  of the  Company  may issue  shares of  Preferred  Stock
without  stockholder  approval  on such  terms as the Board may  determine.  The
rights of the holders of Common  Stock will be subject to, and may be  adversely
affected by, the rights of the holders of any Preferred Stock that may be issued
in the future.  In addition,  the Company's  Certificate  of  Incorporation  and
Bylaws  eliminate the right of  stockholders to act by written consent without a
meeting,  eliminate  cumulative  voting in the election of directors and specify
procedures  for director  nominations  by  stockholders  and submission of other
proposals for consideration at stockholder meetings.  All of the foregoing could
have the effect of delaying,  deferring or preventing a change in control of the
Company and could limit the price that certain investors might be willing to pay
in the future for shares of the Company's  Common  Stock.  See  "Description  of
Capital Stock."

ABSENCE OF DIVIDENDS

    The Company has never  declared or paid  dividends  on its Common  Stock and
does not intend to pay any dividends in the  foreseeable  future.  See "Dividend
Policy."

ARBITRARY DETERMINATION OF OFFERING PRICE; NO PUBLIC MARKET FOR THE SECURITIES

    The initial public  offering price of the Securities and the exercise prices
and terms of the  Warrants  have been  determined  arbitrarily  by  negotiations
between  the  Company  and  the  Representative.   Factors  considered  in  such
negotiations, in addition to prevailing market conditions,  included the history
and prospects for the industry in which the Company  competes,  an assessment of
the Company's  management,  the prospects of the Company,  its capital structure
and  certain  other  factors  as were  deemed  relevant.  Therefore,  the public
offering  price of the  Securities  and the  exercise  prices  and  terms of the
Warrants do not  necessarily  bear any  relationship  to  established  valuation
criteria and  therefore  may not be indicative of prices that may prevail at any
time or from time to time in the public market for the Securities. Prior to this
Offering,  there has been no public market for the Securities,  and there can be
no assurance that an active trading market will develop in any of the Securities
after the Offering, or, if developed, be sustained. See "Underwriting."

PRICE VOLATILITY

    The securities markets have from time to time experienced  significant price
and volume  fluctuations  that may be unrelated to the operating  performance of
particular companies. In addition, the market prices of the common stock of many
publicly traded pharmaceutical or biotechnology companies have in the past been,
and can in the future be expected to be, especially volatile. Announcements of

                                       15





technological  innovations  or new  products by the Company or its  competitors,
developments or disputes  concerning  patents or proprietary  rights,  publicity
regarding actual or potential  clinical trial results relating to products under
development by the Company or its competitors,  regulatory  developments in both
the United States and foreign  countries,  delays in the  Company's  testing and
development schedules, public concern as to the safety of vaccines or biological
products and economic and other external  factors,  as well as  period-to-period
fluctuations in the Company's  financial results,  may have a significant impact
on the market  prices of the  Securities.  The  realization  of any of the risks
described in these "Risk Factors" could have a significant and adverse impact on
such market prices.

POTENTIAL ADVERSE EFFECT OF REPRESENTATIVE'S WARRANTS

    At  the  consummation  of  the  Offering,  the  Company  will  sell  to  the
Representative  for  nominal  consideration  the  Representative's  Warrants  to
purchase up to 250,000  shares of Common  Stock  and/or  250,000  Warrants.  The
Representative's  Warrants  will be  exercisable  for a  period  of  four  years
commencing one year after the effective  date of this  Offering,  at an exercise
price of $ per Share and $ per Warrant [140% of the respective  public  offering
prices of the Shares and the Warrants].  The Warrants  obtained upon exercise of
the  Representative's  Warrants will be  exercisable  for a period of four years
commencing one year after the effective  date of this  Offering,  at an exercise
price of $ per share [140% of the initial public offering price per Share].  For
the term of the  Representative's  Warrants,  the holders  thereof will have, at
nominal cost,  the  opportunity to profit from a rise in the market price of the
Securities without assuming the risk of ownership,  with a resulting dilution in
the interest of other security holders. As long as the Representative's Warrants
remain unexercised,  the Company's ability to obtain additional capital might be
adversely affected. Moreover, the Representative may be expected to exercise the
Representative's  Warrants at a time when the Company would,  in all likelihood,
be able to obtain any needed capital through a new offering of its securities on
terms more favorable than those provided by the Representative's  Warrants.  See
"Underwriting."

POTENTIAL ADVERSE EFFECT OF REDEMPTION OF WARRANTS

    Commencing  18 months  after the date of this  Prospectus,  the Warrants are
subject to redemption  at $0.10 per Warrant on 30 days' prior written  notice to
the Warrant  holders if the average  closing  sales price of the Common Stock as
reported on the AMEX  equals or exceeds $ per share [160% of the initial  public
offering  price per Share of Common  Stock]  for any 20  trading  days  within a
period of 30  consecutive  trading days ending on the fifth trading day prior to
the date of the notice of redemption.  If the Warrants are redeemed,  holders of
the Warrants will lose their rights to exercise the Warrants upon  expiration of
the 30 day notice of redemption period.  Upon receipt of a notice of redemption,
holders  would be required to (i)  exercise  the  Warrants  and pay the exercise
price at a time when it may be disadvantageous  for them to do so, (ii) sell the
Warrants at the current market price,  if any, when they might otherwise wish to
hold the  Warrants or (iii)  accept the  redemption  price which is likely to be
substantially  less  than  the  market  value  of the  Warrants  at the  time of
redemption. See "Description of Securities -- Warrants."

POTENTIAL ADVERSE EFFECT OF SUBSTANTIAL SHARES OF COMMON STOCK RESERVED

    The Company has  reserved a total of  3,728,114  shares of Common  Stock for
issuance as follows:  (i)  2,500,000  shares for issuance  upon  exercise of the
2,500,000  Warrants;  (ii)  250,000  shares for  issuance  upon  exercise of the
Representative's  Warrants;  (iii) 250,000  shares for issuance upon exercise of
the Warrants  issuable  upon  exercise of the  Representative's  Warrants;  (iv)
378,114  shares for issuance upon  exercise of non-plan  stock options and stock
options  granted  under the  Company's  1993 Stock Option Plan;  and (v) 350,000
shares that may be granted  under the  Company's  1997 Stock Plan  following the
Offering. The existence of the Warrants,  the Representative's  Warrants and any
other  options  or  warrants  may  adversely  affect  the  Company's  ability to
consummate future equity financings.  Further,  the holders of such warrants and
options may exercise them at a time when the Company would  otherwise be able to
obtain additional equity capital on terms more favorable to the Company.


                                       16




REPRESENTATIVE'S INFLUENCE ON THE MARKET

    A  significant  amount  of the  Securities  offered  hereby  may be  sold to
customers  of the  Representative.  Such  customers  subsequently  may engage in
transactions  for the sale or  purchase of such  Securities  through or with the
Representative. If it participates in the market, the Representative may exert a
dominating  influence  on  the  market,  if one  develops,  for  the  Securities
described in this Prospectus. Such market making activity may be discontinued at
any time.  The price and  liquidity  of the Common Stock and the Warrants may be
significantly   affected  by  the  degree,  if  any,  of  the   Representative's
participation in the market.

LEGAL RESTRICTIONS ON SALES OF SHARES UNDERLYING THE WARRANTS

    The Warrants are not exercisable  unless,  at the time of the exercise,  the
Company has in effect a current  prospectus  covering the shares of Common Stock
issuable upon exercise of the  Warrants,  and such shares have been  registered,
qualified  or  deemed to be exempt  under  the  securities  laws of the state of
residence of the  exercising  holder of the  Warrants.  Although the Company has
agreed to keep a  registration  statement  covering  the shares of Common  Stock
issuable upon  exercise of the Warrants  effective for the term of the Warrants,
if it fails to do so for any reason, the Warrants may be deprived of value.

    The  Shares  and  Warrants  are  separately  transferable  immediately  upon
issuance.  Purchasers  may buy Warrants in the  aftermarket  in, or may move to,
jurisdictions in which the shares  underlying the Warrants are not so registered
or qualified during the period that the Warrants are exercisable. In this event,
the  Company  would be  unable  to issue  shares to those  persons  desiring  to
exercise  their  Warrants,  and holders of Warrants  would have no choice but to
attempt to sell the Warrants in a jurisdiction where such sale is permissible or
allow them to expire unexercised. See "Description of Securities."

MANAGEMENT'S BROAD DISCRETION IN USE OF PROCEEDS

    Although the Company  intends to apply the net proceeds of this  Offering in
the manner  described  under "Use of Proceeds," it has broad  discretion  within
such proposed uses as to the precise allocation of the net proceeds,  the timing
of expenditures  and all other aspects of the use thereof.  The Company reserves
the right to  reallocate  the net  proceeds of this  Offering  among the various
categories  set forth  under "Use of  Proceeds"  as it, in its sole  discretion,
deems necessary or advisable. See "Use of Proceeds."

LIMITATION OF LIABILITY AND INDEMNIFICATION

    The Company's  Certificate of  Incorporation  limits,  to the maximum extent
permitted  by the  Delaware  General  Corporations  Law  ("Delaware  Law"),  the
personal  liability  of  directors  for  monetary  damages  for  breach of their
fiduciary  duties as a director.  The Company's  Bylaws provide that the Company
shall  indemnify  its officers and directors and may indemnify its employees and
other  agents to the fullest  extent  permitted  by law. The Company has entered
into  indemnification  agreements  with its  officers and  directors  containing
provisions which are in some respects broader than the specific  indemnification
provisions contained in Delaware Law. The indemnification agreements may require
the Company,  among other  things,  to  indemnify  such  officers and  directors
against certain  liabilities that may arise by reason of their status or service
as directors or officers (other than liabilities arising from willful misconduct
of a culpable  nature),  to advance their  expenses  incurred as a result of any
proceeding  against  them as to which they could be  indemnified,  and to obtain
directors' and officers' insurance if available on reasonable terms. Section 145
of the  Delaware  Law  provides  that a  corporation  may  indemnify a director,
officer, employee or agent made or threatened to be made a party to an action by
reason of the fact that he was a  director,  officer,  employee  or agent of the
corporation or was serving at the request of the  corporation  against  expenses
actually and  reasonably  incurred in  connection  with such action if he or she
acted in good faith and in a manner he or she  reasonably  believed  to be in or
not opposed to the best interests of the  corporation,  and, with respect to any
criminal  action or  proceeding,  had no reasonable  cause to believe his or her
conduct was unlawful.  Delaware Law does not permit a corporation to eliminate a
director's  duty of care,  and the  provisions of the Company's  Certificate  of
Incorporation have no effect on the availability of equitable remedies,  such as
injunction  or  rescission,  for a  director's  breach of the duty of care.  See
"Management -- Limitation of Liability and Indemnification."

                                       17






                                 USE OF PROCEEDS

    The  net  proceeds  to be  received  by the  Company  from  the  sale of the
2,500,000  Shares of Common Stock and 2,500,000  Warrants  offered hereby (after
deducting estimated offering expenses and underwriting  discounts payable by the
Company in  connection  with the  Offering)  are  estimated to be  approximately
$16,380,000 ($19,002,000 if the Underwriters' over-allotment option is exercised
in full) based on an assumed initial public offering price of $7.50 per Share of
Common Stock and $0.10 per Warrant.

    The Company intends to use most of the net proceeds of this Offering to fund
its  research  and  development  efforts,  including  clinical  and  preclinical
studies.  In addition,  the Company intends to use approximately $1.1 million of
the net proceeds to establish and equip a small  laboratory  facility to support
its research and development activities.  The remainder of the net proceeds will
be used for  working  capital  and general  corporate  purposes.  The amount and
timing of  expenditures of the net proceeds of this Offering cannot be precisely
determined,  and will depend on numerous  factors,  including  the status of the
Company's product  development  efforts,  the results of clinical trials and the
regulatory  approval  process.  The  Company  may also use a portion  of the net
proceeds to acquire complementary businesses, products or technologies, although
the Company has no  agreements  and is not  involved  in any  negotiations  with
respect  to any such  transaction.  See  "Risk  Factors  --  Management's  Broad
Discretion in Use of Proceeds."  Pending such uses,  the Company plans to invest
the  net  proceeds   from  this   Offering  in   short-term,   investment-grade,
interest-bearing securities.

    The Company  estimates  that its current cash resources and the net proceeds
of  this  Offering  will  be  sufficient  to  meet  its  operating  and  capital
requirements  for at least 12 months  following  the  closing of this  Offering.
However,  there can be no assurance  that the net proceeds of the Offering  will
satisfy  the  Company's  requirements  for any  particular  period of time.  The
Company  anticipates  that additional  funding will be required after the use of
the net proceeds of the Offering. No assurance can be given that such additional
financing will be available when needed on terms  acceptable to the Company,  if
at all. See "Risk Factors -- Need for Substantial Additional Funds."

                                 DIVIDEND POLICY

    The Company has never  declared  nor paid  dividends on its Common Stock and
does not intend to pay any dividends in the foreseeable future.














                                       18




                                 CAPITALIZATION

    The  following  table sets forth,  as of December 31,  1996,  (i) the actual
capitalization  of the  Company  and (ii) the pro  forma  capitalization  of the
Company as adjusted to give effect to the conversion of all  outstanding  shares
of  Preferred   Stock  of  the  Company  into  Common  Stock,   to  reflect  the
reincorporation  of the Company  into the State of  Delaware  and to reflect the
receipt of the estimated  net proceeds from the sale of the 2,500,000  Shares of
Common Stock and 2,500,000  Warrants offered hereby at an assumed initial public
offering  price of $7.50 per Share and $0.10 per  Warrant.  This table should be
read in conjunction  with the financial  statements of the Company and the notes
thereto included elsewhere in this Prospectus.  See "Description of Securities,"
"Use of Proceeds" and "Certain Transactions."




                                                                      DECEMBER 31, 1996
                                                                      -----------------
                                                                                PRO FORMA,
                                                                    ACTUAL      AS ADJUSTED
                                                                    ------      -----------
                                                                        
Note payable to principal stockholder                            $ 3,000,000   $   3,000,000
                                                                 -----------   -------------

Stockholders' equity (net capital deficiency):
  Preferred Stock, par value $0.001 per share;
   5,000,000 shares authorized; 2,616,550 shares issued and
   outstanding on an actual basis, none issued and outstanding
   pro forma, as adjusted                                          2,310,400             --
  Common Stock, par value $0.001 per share;
   30,000,000 shares authorized; 3,111,871 shares issued and
   outstanding on an actual basis, 7,121,886 shares issued
   and outstanding pro forma, as adjusted(1)                        619,156           7,122
  Additional paid-in capital                                            --       19,302,434
  Deferred compensation                                             (45,000)        (45,000)
  Deficit accumulated during the development stage               (4,736,726)     (4,736,726)
                                                                 ----------      ---------- 
  Total stockholders' equity (net capital deficiency)            (1,852,170)     14,527,830
                                                                 ----------      ----------
    Total capitalization                                        $ 1,147,830    $ 17,527,830
                                                                ===========    ============


- -----------
(1)  Excludes   378,114  shares  of  Common  Stock  issuable  upon  exercise  of
     outstanding  non-plan stock options and  outstanding  stock options granted
     under the Company's 1993  Incentive  Stock Plan as of January 31, 1997 at a
     weighted  average  exercise price of $0.90 per share, and 350,000 shares of
     Common Stock reserved for issuance under the Company's 1997 Stock Plan. See
     "Management -- Employee Benefit Plans."


                                       19





                                    DILUTION

    The pro forma net tangible  book value deficit of the Company as of December
31, 1996 was $(1,852,170),  or $(0.40) per share of Common Stock,  determined by
dividing  the pro  forma net  tangible  book  value of the  Company  (pro  forma
liabilities  in excess of  tangible  assets)  by the  number of shares of Common
Stock  outstanding  as of December  31, 1996  (assuming  the  conversion  of all
outstanding shares of Preferred Stock into Common Stock). After giving effect to
the receipt of the net proceeds of the sale of 2,500,000  shares of Common Stock
and 2,500,000  Warrants  offered hereby at an assumed  initial  public  offering
price of $7.50  per Share and $0.10  per  Warrant,  the  adjusted  pro forma net
tangible  book  value of the  Company  at  December  31,  1996  would  have been
$14,527,830,  or $2.04 per share.  This represents an immediate  increase in pro
forma net tangible book value of $2.44 per share to existing stockholders and an
immediate  dilution of $5.46 per share to new  investors.  The  following  table
illustrates the per share dilution:

 Assumed initial public offering price per share                         $  7.50

   Pro forma net tangible book value deficit per share           $ (.40)
   Increase per share attributable to new stockholders             2.44
                                                                   ----
Pro forma net tangible book value per share after the Offering              2.04
                                                                            ----
Dilution per share to new stockholders                                    $ 5.46
                                                                          ======

    In the event the  Over-allotment  Option is exercised in full, the pro forma
net tangible  book value as of December 31, 1996 would be  $17,149,830  or $2.29
per share of Common  Stock,  which  would  result in  immediate  dilution in net
tangible book value to new investors of approximately $5.21 per share.

    The  following  table  summarizes,  on a pro forma basis as of December  31,
1996, the difference between the number of shares of Common Stock purchased from
the Company,  the total  consideration paid and the average price per share paid
by existing  stockholders  of Common Stock and by the new  investors  purchasing
shares in this  Offering,  assuming the sale of the  2,500,000  Shares of Common
Stock and  2,500,000  Warrants  offered  hereby  at an  assumed  initial  public
offering price of $7.50 per Share and $0.10 per Warrant and before any deduction
of underwriting discounts and estimated offering expenses.


                              NUMBER OF                              
                          SHARES PURCHASED(1)   TOTAL CONSIDERATION    AVERAGE
                          -------------------   -------------------     PRICE  
                           NUMBER   PERCENT      AMOUNT     PERCENT   PER SHARE
                           ------   -------      ------     -------   ---------
Existing stockholders    4,621,886    64.9%   $  2,877,556    13.3%   $ .62
New investors            2,500,000    35.1%    18,750,000     86.7%   $7.50(2)
                         ---------    ----     ----------     ----     
  Total                  7,121,886   100.0%   $21,627,556    100.0%
                         =========   =====    ===========    ===== 


- ---------
(1)  Excludes   378,114  shares  of  Common  Stock  issuable  upon  exercise  of
     outstanding  non-plan stock options and  outstanding  stock options granted
     under the Company's 1993  Incentive  Stock Plan as of January 31, 1997 at a
     weighted  average  exercise price of $0.90 per share, and 350,000 shares of
     Common Stock reserved for issuance under the Company's 1997 Stock Plan. See
     "Management -- Employee Benefit Plans."

(2)  Attributes no value to the Warrants.


                                       20




                          SELECTED FINANCIAL DATA

    The selected financial data set forth below is qualified in its entirety by,
and should be read in  conjunction  with,  the  Financial  Statements  and Notes
thereto and  "Management's  Discussion  and Analysis of Financial  Condition and
Results of Operations"  included elsewhere in this Prospectus.  The statement of
operations  data for the years ended  December 31,  1994,  1995 and 1996 and the
period from December 8, 1992  (inception)  to December 31, 1996, and the balance
sheet  data at  December  31,  1995 and 1996,  are  derived  from the  financial
statements  of Jenner  Technologies,  Inc.  appearing  elsewhere  herein,  which
financial  statements  have  been  audited  by  Ernst & Young  LLP,  independent
auditors,  whose report is included elsewhere in this Prospectus.  The statement
of operations data set forth for the period from inception (December 8, 1992) to
December  31, 1993 and the balance  sheet data as of December  31, 1993 and 1994
were derived from audited  financial  statements  of the Company,  which are not
included in this  Prospectus.  The results for the year ended  December 31, 1996
are not necessarily indicative of the results for any future period.






                                                                 
                                             PERIOD FROM                                          PERIOD FROM
                                              INCEPTION                                            INCEPTION
                                            (DECEMBER 8,                                         (DECEMBER 8,
                                              1992) TO          YEAR ENDED DECEMBER 31,            1992) TO
                                            DECEMBER 31,    ---------------------------------     DECEMBER 31,
                                                1993          1994        1995         1996          1996
                                            -----------    ---------   ---------   -----------   ------------
STATEMENT OF OPERATIONS DATA:
                                                                                          
Revenues                                     $      --     $      --   $      --   $        --    $       --
Operating expenses:
   Research and development                     338,626      499,366     698,303     2,206,900      3,743,195
   General and administrative                   137,325      228,114     195,663       339,948        901,050
                                              ---------    ---------   ---------   -----------    -----------
     Total operating expenses                   475,951      727,480     893,966     2,546,848      4,644,245
                                              ---------    ---------   ---------   -----------    -----------
Loss from operations                           (475,951)    (727,480)   (893,966)   (2,546,848)    (4,644,245)
Interest income (expense)                         9,037       22,369      17,100      (140,987)       (92,481)
                                              ---------   ----------   ---------   -----------    ----------- 
Net loss                                      $(466,914)  $ (705,111)  $(876,866)  $(2,687,835)   $(4,736,726)
                                              =========   ==========   =========   ===========    =========== 
Pro forma net loss per share(1)                                                    $     (0.56)
                                                                                   =========== 
Shares used to compute pro forma net loss
  per share(1)                                                                       4,785,863
                                                                                   ===========







                                                                                DECEMBER 31,
                                                             --------------------------------------------------
                                                               1993         1994          1995          1996
                                                             --------    ----------    -----------   ----------
                                                                                         
Balance Sheet Data:
Working capital                                             $ 440,793   $   537,814   $    254,539   $ 1,317,447
Total assets                                                  505,294       602,362        336,371     1,563,392
Note payable to principal stockholder                              --            --             --     3,000,000
Deficit accumulated during the development stage             (466,914)   (1,172,025)    (2,048,891)   (4,736,726)
Total stockholders' equity (deficit)                          452,700       550,108        273,275    (1,852,170)



- ----------
(1) See  Note 1 of Notes  to  Financial  Statements  for an  explanation  of the
    determination of the number of shares used to compute pro forma net loss per
    share.


                                       21




                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                  FINANCIAL CONDITION AND RESULTS OF OPERATIONS

    This Prospectus contains  forward-looking  statements.  Such forward-looking
statements include, but are not limited to, the Company's expectations regarding
its future  financial  condition and  operating  results,  product  development,
business and growth strategy, market conditions and competitive environment. The
Company's actual results could differ materially from those anticipated in these
forward-looking  statements as a result of certain factors,  including those set
forth under "Risk Factors" and elsewhere in this Prospectus.

OVERVIEW

    The Company was  incorporated in December 1992 and expects to  reincorporate
in  Delaware  prior to  consummation  of this  Offering.  The  Company is in the
development  stage and is subject to all business  risks  associated  with a new
enterprise,  including uncertainties regarding product development,  constraints
on the Company's financial and personnel  resources,  and dependence on and need
for third  party  relationships.  At  December  31,  1996,  the  Company  had an
accumulated deficit of approximately $4.7 million.  The Company anticipates that
it will continue to incur substantial  additional  operating losses for at least
the next  several  years  and  expects  cumulative  losses  to  increase  as the
Company's  research and development  efforts  expand.  The Company has a limited
history of operations  consisting  primarily of  development of its products and
sponsorship of research and clinical  trials.  The Company has not generated any
revenue to date,  whether from product sales,  license fees or research funding,
and there can be no  assurance  as to when or whether it will be able to develop
sources of revenue or that its operations will become profitable,  even if it is
able to commercialize any products.

RESULTS OF OPERATIONS

 YEARS ENDED DECEMBER 31, 1994, 1995 AND 1996

    Research  and  Development  Expenses.   Research  and  development  expenses
increased  from $499,000 in 1994 to $698,000 in 1995 to $2,207,000 in 1996.  The
increase  in 1995  over  1994  was  primarily  associated  with  production  and
formulation  activities  supporting  the  Company's  first  limited  Phase  I/II
clinical trial of OncoVax-P. The increase in 1995 was also the result of initial
production and  formulation  of  OncoVax-CL.  The increase in 1996 expenses over
1995 is attributed  to further  production of OncoVax-P in support of additional
limited Phase I/II clinical trials and support for a limited Phase I/II clinical
trial of  OncoVax-CL  which is scheduled to begin in the first  quarter of 1997.
Research and development  expenses in 1996 also include $830,000 associated with
acquiring rights to certain in-process research and development (ACT and JT3002)
from  Novartis.  This  technology  is  currently  being  utilized in a Phase III
clinical trial for patients with osteogenic sarcoma. Management anticipates that
research and  development  expenses  will increase  significantly  over the next
several years in support of ongoing and planned  clinical  trials in each of the
Company's principal product development programs.

    General  and  Administrative  Expenses.  The  Company  incurred  general and
administrative  expenses of  $228,000,  $196,000 and $340,000 in the years ended
1994,  1995 and 1996,  respectively.  General and  administrative  expenses were
substantially the same in 1994 and 1995,  except for a non-recurring  settlement
of a finder's fee  agreement  in the amount of $30,000 in 1994.  The increase of
$144,000 in 1996  compared  with 1995 is due  primarily to salary  increases and
increases in legal expenses related to the acquisition of technology and general
corporate  matters.   The  Company  expects  to  incur  increasing  general  and
administrative  expenses  in 1997 as a result  of adding  personnel,  increasing
office rental costs and other costs related to supporting  increases in staffing
and operating as a public company.

    Interest Income (Expense). Interest income in 1996 was offset by an increase
in interest  expense  from $3,000 in 1995 to $203,000 in 1996 as a result of the
$3 million debt financing with the Company's principal shareholder.

                                       22






LIQUIDITY AND CAPITAL RESOURCES

    The Company has funded its operations to date primarily  through the sale of
equity  securities  and  borrowings  from  its  principal  stockholder.  Through
December 31, 1996,  the Company has raised  approximately  $2.4 million from the
sale of equity  securities and $3.0 million  through the  stockholder  loan. See
"Certain  Transactions."  At December  31,  1996,  the Company had cash and cash
equivalents of $1.4 million and an outstanding principal balance of $3.0 million
under the stockholder  loan.  Borrowings  under the stockholder loan bear simple
interest  at a rate of 10% per annum.  The  principal  and  accrued  interest is
payable on May 6, 1999.  Cash used in operating  activities  totalled  $698,000,
$871,000  and  $1,900,000  in 1994,  1995 and 1996,  respectively.  Cash used to
acquire capital equipment has not been  significant.  The Company intends to use
approximately  $1.1 million of the net proceeds of the Offering to establish and
equip a small  laboratory  facility  to support  its  research  and  development
activities. See "Use of Proceeds."

    The Company's  operations to date have consumed  substantial  and increasing
amounts of cash. The negative cash flow from  operations is expected to continue
and  to  accelerate  in  the  foreseeable   future.  The  Company  will  require
substantial  funds of its own, or from third  parties,  to conduct  research and
development,  preclinical  and  clinical  testing  and to  manufacture  (or have
manufactured) and market (or have marketed) its product candidates.  The Company
estimates  that its current cash  resources and the net proceeds of the Offering
will be sufficient to meet its operating and capital  requirements  for at least
12 months  following the closing of the Offering.  However,  the Company's  cash
requirements  may vary  materially  from those now planned because of results of
research  and  development,   results  of  preclinical  and  clinical   testing,
relationships  with  possible  strategic  partners,  changes  in the  focus  and
direction of the Company's  research and development  programs,  competitive and
technological  advances,  the FDA regulatory process and other factors.  The net
proceeds  of this  Offering  are  not  expected  to be  sufficient  to fund  the
Company's  operations  through  the  commercialization  of one or more  products
yielding sufficient revenues to support the Company's operations; therefore, the
Company is likely to need to raise  additional  funds.  The  Company may seek to
satisfy its future funding  requirements  through public or private offerings of
securities,  with collaborative or other arrangements with major  pharmaceutical
companies or from other sources.  Additional financing may not be available when
needed or on terms  acceptable  to the  Company.  If adequate  financing  is not
available, the Company may not be able to continue as a going concern, or may be
required  to  delay,  scale  back  or  eliminate  certain  of its  research  and
development  programs,  to relinquish  rights to certain of its  technologies or
product candidates, to forego desired opportunities, or to license third parties
to commercialize  products or technologies that the Company would otherwise seek
to develop  itself.  To the  extent the  Company  raises  additional  capital by
issuing equity securities,  ownership dilution to the investors in this Offering
will result.

INCOME TAXES

    The Company has elected to be taxed as a C corporation  since its inception.
At December 31, 1996, the Company had federal net operating  loss  carryforwards
of approximately $3.7 million and research and development credit  carryforwards
of approximately  $40,000.  The net operating loss and credit carryforwards will
expire  at  various  dates  beginning  in  2008,  if not  utilized.  There is no
guarantee that the Company will have future  profitable  operations  which would
allow the use of the tax benefits. In addition, utilization of the net operating
losses and credits may be subject to a substantial  annual limitation due to the
"change of  ownership"  provisions  of the  Internal  Revenue  Code.  The annual
limitation may result in the expiration of the carryforwards before utilization.

                                       23







                                    BUSINESS

    This Prospectus contains  forward-looking  statements.  Such forward-looking
statements include, but are not limited to, the Company's expectations regarding
its future  financial  condition and  operating  results,  product  development,
business and growth strategy, market conditions and competitive environment. The
Company's actual results could differ materially from those anticipated in these
forward-looking  statements as a result of certain factors,  including those set
forth under "Risk Factors" and elsewhere in this Prospectus.

THE COMPANY

    Jenner Technologies,  Inc. ("Jenner" or the "Company"),  a development stage
company, is engaged in the development of immunotherapies to treat patients with
cancer and certain side effects  related to  chemotherapy.  The Company has four
product candidates under development, two of which are in clinical trials. Three
of the  Company's  product  candidates  are  designed  to delay or  prevent  the
recurrence  of cancer by  stimulating  the body's  own  immune  system to attack
microscopic disease remaining after a patient has undergone traditional therapy.
The  Company's  product  candidates  consist of macrophage  activators  (ACT and
JT3002)  and  therapeutic  vaccines  (OncoVax-P  and  OncoVax-CL).  The  Company
acquired the technology related to ACT and JT3002 through an exclusive worldwide
license with  Novartis AG (the company  resulting  from the merger of Ciba-Geigy
Limited and Sandoz,  Ltd.) ("Novartis").  In addition,  the Company acquired the
rights to produce  the  antigen  related to  OncoVax-P  through a  non-exclusive
license with Research Corporation Technologies,  Inc. and the antigen related to
OncoVax-CL through an exclusive worldwide license with Eli Lilly & Company.

    ACT is in a nationwide  Phase III  clinical  trial as a therapy for patients
with  osteogenic  sarcoma  (bone  cancer).  The  study  calls for a total of 645
patients  to be  treated  under the  protocol  and,  as of  December  31,  1996,
approximately  540 patients had entered the study. ACT utilizes a small molecule
that has the capacity to activate  macrophages,  which are scavenger  cells that
are part of the immune system.  Once activated,  macrophages acquire the ability
to seek out and  destroy  tumor  cells.  ACT  utilizes a  proprietary  liposomal
formulation  to  deliver  its  active  ingredients  (liposomes  are  spheres  of
subcellular size composed primarily of fat molecules).  JT3002 is in preclinical
evaluation as a therapy for mucositis (damage to the gastrointestinal  mucosa or
lining of the gut), a side effect  commonly  associated with  chemotherapy.  The
Company intends to file an Investigational New Drug application ("IND") with the
United States Food and Drug Administration ("FDA") in late 1997 or early 1998 to
commence  Phase I  clinical  trials of  JT3002,  subject  to the  results of the
preclinical evaluation.

    OncoVax-P is in limited Phase I/II clinical trials in patients with prostate
cancer.  The Company intends to commence a limited Phase I/II clinical trial for
OncoVax-CL in patients with colorectal  cancer in the first quarter of 1997. The
Company's Phase I/II clinical trials are conducted in a small number of patients
(5-6) to gain  preliminary  information  regarding  safety  of the  vaccine  and
ability to generate an immune response.  OncoVax-P and OncoVax-CL each include a
genetically  engineered  version of a tumor associated  antigen which represents
the "identity  tag" of the cancer cell combined with an adjuvant  which enhances
the body's immune  response.  The antigen and adjuvant are packaged in liposomes
which are taken up by  antigen  presenting  cells.  The  Company  believes  this
approach  will  induce  a more  robust  relevant  immune  response  than  if the
liposomal  delivery system is not used.  Based on preclinical  data, the Company
believes that OncoVax-CL has the potential for application in cancer indications
other than colorectal cancer, such as lung, pancreatic and ovarian cancer.

    In an effort to leverage the Company's resources and better manage the risks
and costs inherent in scientific  research and new product  development,  Jenner
has  followed a business  strategy  of (i)  in-licensing  promising  proprietary
technologies for which substantial preclinical and/or clinical studies have been
undertaken,  (ii) focusing on human clinical trials to gain relevant information
rather  than   developing   animal   models,   and  (iii)   engaging   qualified
subcontractors  to perform  research  and  development  functions.  Through this
business  strategy,  the Company has expended only approximately $4.0 million in
cash through  December 31, 1996 to develop its current  product  candidates  and
believes it has extended its research efforts to a larger number of applications
than would otherwise be the case given its limited resources.

                                       24






    The Company believes that its business strategy and management  capabilities
may enable it to shorten the time frame for  commercializing  its products.  The
Company intends to pursue its business  strategy further by seeking to establish
strategic alliances with  pharmaceutical  companies and other corporate partners
in connection  with  development,  marketing and  distribution  of the Company's
product candidates.

 CANCER INCIDENCE AND TREATMENT

    Cancer is the second leading cause of death in the United  States.  Based on
cancer incidence data collected by the National Cancer Institute's Surveillance,
Epidemiology  and End Results (SEER) program and U.S.  population data collected
by the Bureau of the Census, it is estimated that approximately 1.38 million new
cancer cases and 560,000 deaths will occur in the United States in 1997.

    The current  treatment  regimens for cancer consist  primarily of surgery to
remove  malignant  tumors,  radiation  therapy to treat tumors or  post-surgical
residual tumor cells in a localized area in the body, and  chemotherapy to treat
cancer that has spread systemically. Depending upon the type and severity of the
cancerous tumor, these therapies can be used individually or in combination with
each other.

    Surgery  is the most  effective  treatment  for  cancer and the one with the
greatest  potential  cure  of  solid  tumors.   However,   despite   significant
improvements  in early  diagnosis and in surgical  techniques,  many  surgically
treated  patients  experience  recurrence of cancer.  The chances for recurrence
depend  on the type of  cancer,  how  early it is  detected,  and if  metastases
(distant spread of the tumor) occurred prior to surgical  removal of the primary
tumor.  Most deaths  from cancer are due to  metastases  that are  resistant  to
conventional therapies.

    Radiation therapy involves  subjecting tumor cells to radiation which causes
the cells to die or  multiply  more  slowly.  Because  certain  tumor  cells are
rapidly dividing,  they are often more sensitive to radiation than normal cells,
allowing  radiation therapy to kill these cells with a resultant  improvement in
the patient's  condition.  However,  because of the overall  damaging  nature of
radiation,  it is generally  limited in use to small specific sites that are not
near sensitive organs or structures.  In addition, the toxicity of the radiation
to normal cells limits the amount of radiation that can be  administered,  which
in turn limits the effectiveness of radiation therapy in killing cancer cells.

    Chemotherapy  involves  the use of  drugs  that  slow  down or kill  rapidly
dividing  cells.  Although many cancer cells fall into this category,  there are
also normal cells in the body which divide  rapidly.  These include cells of the
gastrointestinal mucosa and bone marrow. Since chemotherapy affects all of these
cell populations,  it produces significant side effects,  including mucositis, a
serious  condition  that can cause  gastrointestinal  ulcerations  and diarrhea.
Thus,  administration of chemotherapy  carries with it the hazard of significant
complications,  and, for solid tumors, it generally does not achieve cure of the
disease.  For prostate cancer,  chemotherapy has minimal efficacy,  but hormonal
therapy may delay tumor progression for a period of time.

    Current  treatments  for  metastatic  cancers  are not very  effective.  The
Company believes that recent technological advances and increased  understanding
of the immune  system  make  possible  cancer  therapies  that will  activate or
stimulate the immune system offering the potential for new, effective treatment.

JENNER'S PRODUCT CANDIDATES AND CLINICAL TRIALS

    The Company has two primary areas of product  focus:  macrophage  activators
and therapeutic vaccines. Three of the Company's product candidates are designed
to delay or  prevent  the  recurrence  of cancer by  stimulating  the body's own
immune  system to  attack  microscopic  disease  remaining  after a patient  has
undergone traditional therapy. The Company's other product candidate is designed
to  ameliorate  certain  side  effects  of  chemotherapy.  There  have been many
scientific  advances  in recent  years that have  enabled  the Company to pursue
development of its macrophage  activators and  therapeutic  vaccines.  Hybridoma
technology has permitted the  development of monoclonal  antibodies  that can be
used to identify  and  characterize  tumor  associated  antigens  important  for
vaccine  development  and to  study  their  tissue  distribution.  In  addition,
advances  in genetic  engineering  have 

                                       25





enabled  cost-effective  production  of  specific  antigens  once they have been
identified. Finally, advances in biology have provided a better understanding of
the immune response and methods to manipulate it for the clinical benefit of the
patient.

    The  table  below  sets  forth  the  Company's   principal   products  under
development,  the primary indications for these products and the clinical status
for each product.


    PRODUCT CANDIDATE               INDICATION               CLINICAL STATUS
    -----------------               ----------               ---------------
     ACT                        Osteogenic Sarcoma              Phase III

     OncoVax-P                   Prostate Cancer           Limited Phase I/II*

     OncoVax-CL                 Colorectal Cancer          Limited Phase I/II*
                                                           Patient Enrollment

     JT3002                         Mucositis            Preclinical Evaluation


- ----------
* Jenner's limited Phase I/II clinical trials are conducted in a small number of
  patients (5-6) to gain preliminary information regarding safety of the vaccine
  and ability to generate an immune response.


ACT

    ACT is  currently  in a pivotal  Phase III  randomized  trial as therapy for
patients  with  osteogenic  sarcoma.  The pivotal  Phase III  clinical  trial is
sponsored by the National Cancer  Institute of the U.S.  National  Institutes of
Health and is being  conducted  nationwide by the Children's  Cancer Study Group
and the  Pediatric  Oncology  Group.  These groups  include the majority of U.S.
centers  treating  patients with  osteogenic  sarcoma.  The Overall Chair of the
study is Paul Meyers, M.D. of Memorial  Sloan-Kettering Cancer Center. The Phase
III study has been  designed to evaluate the  efficacy of ACT when  administered
for nine  months  with  chemotherapy  following  surgical  excision  of  primary
osteogenic  sarcoma.  End  points  of the study are  disease-free  survival  and
survival.  The study calls for a total of 645  patients to be treated  under the
protocol  and, as of December 31, 1996,  approximately  540 patients had entered
the study. It is estimated that there will be  approximately  2,500 new cases of
osteogenic  sarcoma in the  United  States in 1997.  The  Company  acquired  the
technology related to ACT through an exclusive worldwide license with Novartis.

    The Phase III pivotal  trial  design is based on the  results  obtained in a
Phase II trial conducted at University of Texas, M.D. Anderson Cancer Center, in
children and adults with pulmonary  metastasis of osteogenic  sarcoma.  Patients
who entered the Phase II trial had histologically proven osteogenic sarcoma with
pulmonary  metastases that had developed  during  adjuvant  chemotherapy or that
were present at diagnosis, persisted despite chemotherapy and recurred following
surgical excision.  Patients were rendered  clinically  disease-free by surgery.
ACT was  administered  postoperatively  to two  separate  groups of patients for
three months or six months,  respectively.  For  comparison,  medical records of
patients  previously  treated  at the  same  institution  were  reviewed  and 21
patients  identified  whose disease status was similar but who were treated with
chemotherapy  rather than ACT.  The median time to relapse was 4.5 months in the
21  patients  treated  with  chemotherapy,  6.8  months in the 12  patients  who
received  three  months of ACT  therapy,  and 9.0 months in the 16 patients  who
received six months of ACT therapy.  The increase in median time to relapse from
4.5 months to 9 months represents a statistically  significant  increase.  These
data  suggested  that ACT is an active  agent in  osteogenic  sarcoma,  that six
months  of  ACT  is  superior  to  three  months,  and  that  a  more  prolonged
administration  of the drug (nine to 12 months)  could benefit more patients and
could result in even longer disease-free intervals.

    ACT  is  a  liposomal  formulation  of  MTP-PE,  which  is  a  conjugate  of
muramyl-tripeptide (MTP) and dipalmitoylphosphotidylethanolamine  (PE). MTP is a
synthetic  derivative of muramyl dipeptide,  a naturally  occurring component of
bacterial  cell  walls  that has the  capacity  to  activate  macrophages.

                                       26




Once activated,  macrophages acquire the ability to distinguish tumor cells from
normal cells and will kill only the tumor cells. Both the liposomal  formulation
and the basic molecule of MTP-PE are proprietary to the Company.

    Based on the  results  of the Phase II trial  and  earlier  preclinical  and
clinical  trials,  the  Company  believes  that  ACT  may  be  effective  as  an
immunotherapeutic  for other types of cancer as well. The data suggests that ACT
is most effective when  administered  at a time when the tumor burden is minimal
but the patient is at high risk of recurrence  because of tiny  metastases  left
behind following standard treatment.  The Company is in the process of designing
new Phase II  clinical  trials and  defining  patient  populations  to study the
efficacy  of ACT in the  adjuvant  setting  for  cancers  other than  osteogenic
sarcoma.  Substantial  additional  research and development will be necessary in
this regard,  and there can be no  assurance  that ACT will be shown in clinical
trials to be  effective  for the  treatment of  osteogenic  sarcoma or any other
cancer indication.  See "Risk Factors -- No Assurance of Product  Development or
Commercialization; Uncertainties Related to Clinical Trials."

CANCER VACCINES

    The Company is  developing  OncoVax-P  to treat  prostate  cancer.  Prostate
cancer is the most common malignancy among men in the United States,  accounting
for an estimated  43% of all cancer  malignancies  in men. It is estimated  that
there will be 334,500 new cases of prostate  cancer in the United States in 1997
and over 40,000 deaths.  OncoVax-P  includes a prostate  specific  antigen (PSA)
licensed  from  Research  Technologies  Corporation  combined  with an  adjuvant
formulated into liposomes. In the third quarter of 1995, the Company initiated a
limited  Phase I/II  clinical  trial for  OncoVax-P in which six  patients  with
advanced  metastatic  prostate  cancer  who  had  all  failed  standard  therapy
(including hormonal therapy) were treated with OncoVax-P. Moreover, although all
patients had advanced disease, two of the patients mounted an immune response to
the PSA antigen in the vaccine.

    Based on the foregoing  results,  the Company has initiated three additional
limited Phase I/II clinical trials using OncoVax-P,  each of which involves five
or six  evaluable  patients.  These new  trials are  designed  to  determine  an
effective  regimen  for  inducing a strong  immune  response  and will study the
effect of (i) administering OncoVax-P intravenously rather than intramuscularly,
(ii) administering  OncoVax-P in combination with granulocyte  macrophage-colony
stimulating  factor  (GM-CSF),  a cytokine  that has been shown to enhance white
blood  cell count and  immune  response,  and (iii)  pretreating  patients  with
cyclophosphamide, a chemotherapy drug, and then treating them with a combination
of OncoVax-P and bacillus Calmette-Guerin (BCG), a bacterium-based  adjuvant. In
a fourth limited Phase I/II trial planned to commence  later in 1997,  OncoVax-P
will be evaluated in a proprietary emulsion formulation. The clinical trials are
sponsored  by the Company and are  conducted by David  Harris,  M.D. at Lankenau
Hospital near Philadelphia, Pennsylvania.

    The Company is developing OncoVax-CL to treat colorectal cancer.  Colorectal
cancer is  currently  the third  most  commonly  occurring  cancer in the United
States.  It is  estimated  that there will be  131,000  new cases of  colorectal
cancer in the United States in 1997 and 55,000 deaths.  Approximately 50% of all
persons  diagnosed  with  colorectal  cancer die within five years of diagnosis.
OncoVax-CL consists of a liposomal formulation of an antigen (KSA) licensed from
Eli Lilly & Company and an adjuvant. The Company has submitted an IND to the FDA
for  OncoVax-CL  and expects to  commence a limited  Phase I/II  clinical  trial
involving  six  evaluable  patients  in the first  quarter of 1997.  The Company
sponsored  clinical trial will be conducted by Albert F.  LoBuglio,  M.D. at the
University of Alabama.  Based on  preclinical  data,  the Company  believes that
OncoVax-CL may have the potential for  application in cancer  indications  other
than colorectal cancer, such as lung, pancreatic and ovarian cancer.

    Each of the Company's  cancer  vaccines  includes a  genetically  engineered
version of a tumor associated antigen combined with an adjuvant. An antigen is a
substance  which  induces an immune  response  within the body. An adjuvant is a
substance that is administered with an antigen to enhance the immune response to
the antigen.  The antigen and adjuvant are packaged in liposomes.  The liposomal
formulation  targets  the  antigen-presenting  cells of the immune  system.  The
immune  response  includes  direct  killing of the tumor  cells by the  T-cells,
production of antibodies which activate the patient's

                                       27





defense  mechanisms  to kill the tumor cells,  and the  generation  of cytokines
which kill tumor cells directly and indirectly  through activating the patient's
defenses.  Research  and  development  and  clinical  testing  of the  Company's
vaccines are at an early stage and there can be no assurance  that such vaccines
will be shown in clinical  trials to be safe or effective in treating any cancer
indication.  See  "Risk  Factors  -- No  Assurance  of  Product  Development  or
Commercialization; Uncertainties Related to Clinical Trials."

JT3002

    JT3002 is in preclinical  evaluation for the therapy of mucositis,  a common
side  effect  of  chemotherapy.   Mucositis  may  cause  severe,  disabling  and
potentially  life  threatening side effects in patients and may lead to the need
for extended hospitalization.  For some chemotherapy regimens,  mucositis is the
major dose limiting side effect.  There is currently no effective  treatment for
mucositis.  Preclinical studies are being conducted by Isaiah J. Fidler, D.V.M.,
Ph.D., a director of the Company and a member of its Scientific  Advisory Board,
at  the  University  of  Texas,  M.D.  Anderson  Cancer  Center.   See  "Certain
Transactions."  The Company  intends to file an IND with the FDA in late 1997 or
early 1998 to commence Phase I clinical trials of JT3002, subject to the results
of the preclinical  evaluation.  The Company acquired the technology  related to
JT3002  through an  exclusive  worldwide  license  with  Novartis.  Research and
development  of JT3002 is at a very  early  stage and there can be no  assurance
that  JT3002 will be shown in  preclinical  studies or in  clinical  trials,  if
undertaken,  to be safe or effective in treating mucositis. See "Risk Factors --
No Assurance of Product Development or Commercialization;  Uncertainties Related
to Clinical Trials."

BUSINESS STRATEGY

    Scientific  research  and the  development  of  therapeutic  products  is an
uncertain  endeavor  in which many  projects  fail,  even though they may appear
promising  at  an  earlier  stage.  Moreover,   the  infrastructure,   including
facilities,   equipment  and  qualified  personnel,   needed  for  research  and
development  in  biotechnology  is very  costly.  As a  result,  in an effort to
leverage the Company's  resources and better manage the risks and costs inherent
in  scientific  research  and new  product  development,  Jenner has  followed a
business  strategy of (i) in-licensing  promising  proprietary  technologies for
which substantial preclinical and/or clinical studies have been undertaken, (ii)
focusing on human  clinical  trials to gain relevant  information  as opposed to
developing animal models, and (iii) engaging qualified subcontractors to perform
research and development  functions.  Where possible,  it has been the Company's
policy to second and sometimes  third source those  subcontracted  services that
are vital to the Company's product  development.  Through its business strategy,
the  Company  has  expended  only  approximately  $4.0  million in cash  through
December 31, 1996 to develop its current product  candidates and believes it has
extended  its research  efforts to a larger  number of  applications  than would
otherwise be the case given its limited resources.

    The Company's  management has  considerable  experience in  identifying  and
licensing  promising  technologies,   retaining  and  managing  the  efforts  of
subcontractors,  and designing,  supervising and monitoring clinical trials. The
Company's  Chief  Executive   Officer  has  extensive   experience  in  business
management and has scientific knowledge complementary to the Company's business.
The Company's  President and Chief Scientific  Officer has worked in the area of
cancer  therapy  for  over  25  years,  and  combines  comprehensive  scientific
knowledge with business experience.  The Company recently hired a Vice President
of Clinical Trials and Product Development,  and believes that his experience in
the  areas  of  clinical  trials  and  product   development   will  be  key  to
commercialization of the Company's product candidates. The Company believes that
the  overlapping  skills  of its  management  has  enabled  them to  communicate
effectively and manage the Company efficiently.  The Company intends to continue
to  recruit  highly  qualified  personnel  with a broad base of  scientific  and
business skills to complement existing management.

    The Company believes that its business strategy and management  capabilities
may enable it to shorten the time frame for commercializing its products. As the
Company's product candidates advance through the regulatory process, the Company
generally intends to establish strategic alliances with pharmaceutical companies
and other corporate partners with large distribution  systems to market and sell
the Company's products worldwide.  In some cases,  however,  where the customers
for a product are easily  identified and  concentrated,  the Company  intends to
market and distribute the product through a direct sales force.

                                       28






    Although  the Company  believes  that it has  benefitted  from its  business
strategy,  the strategy creates risks to the Company by placing critical aspects
of the Company's business in the hands of third parties whom the Company may not
be able to  control  as  effectively  as its own  operations.  Additionally,  in
reliance on these relationships, the Company has not developed its own resources
to the extent these  activities have been contracted to third parties.  If these
third parties do not perform in a timely and  satisfactory  manner,  the Company
may incur  additional  costs and lose time in the conduct of its development and
clinical  programs as it seeks alternate  sources of such products and services,
if  available.  The effect of such costs and delays may have a material  adverse
effect on the Company.

    The Company may seek additional third party  relationships in certain areas,
particularly  in  situations  in which the Company  believes  that the  clinical
testing,  marketing,  manufacturing  and  other  resources  of a  pharmaceutical
company  collaborator will enable the Company to develop particular  products or
geographic  markets which are otherwise  beyond the Company's  resources  and/or
capabilities.  There is no assurance that the Company will be able to obtain any
such  collaboration,  or any other research and development,  manufacturing,  or
clinical  trial  agreement.  The inability of the Company to obtain and maintain
satisfactory relationships with third parties may have a material adverse effect
on the Company.

LICENSES

    Novartis  Corporation.  The Company is a party to a license  agreement  with
Novartis  which was  entered  into in April 1996.  Under the license  agreement,
Novartis  granted to Jenner an exclusive  worldwide  license under its rights in
certain  U.S.  and foreign  patent  applications  and  patents  and  proprietary
know-how to  manufacture  and  commercialize  products  incorporating  liposomal
MTP-PE  (ACT)  and CGP  40774  (JT3002)  and  their  analogues  in all human and
veterinary  therapeutic  and  prophylactic  uses,  excluding  use  as a  vaccine
adjuvant and, with respect to JT3002,  excluding use for the treatment of asthma
and other allergic  diseases which materially  affect lung function.  Jenner may
grant and authorize  sub-licenses  under its license.  In consideration  for the
license,  the  Company  has paid to  Novartis  an  up-front  license  fee and is
obligated to pay running  royalties  based on a  percentage  of the net sales of
licensed  products sold by the Company or its sublicensees,  annual  maintenance
fees and one-time  milestone  payments for the first products  incorporating ACT
and JT3002, respectively, upon the completion of a Phase III clinical trial, the
filing of a PLA,  and FDA approval of such PLA.  The  obligation  to pay running
royalties begins upon the first commercial sale of a particular licensed product
and  terminates  15 years  later.  Jenner has an  obligation  to use  reasonable
efforts to diligently develop and commercialize the patent rights licensed under
the agreement  and to obtain such  approvals as may be necessary for the sale of
the licensed  products in the United States and such other worldwide  markets as
the Company  elects to  commercialize  the  licensed  products.  If the Company,
either  itself  or  through  a  sublicensee  or a  distributor,  elects  not  to
commercialize a licensed product in any particular country,  then the Company is
obligated to negotiate a sublicense  with Novartis in such country on reasonable
terms  customary in the industry.  If the Company  elects to  commercialize  any
licensed product for veterinary uses through a sublicensee,  Novartis shall have
a right of first refusal to acquire an exclusive, worldwide sublicense to market
such licensed  product for  veterinary  purposes on agreed terms  reasonable and
customary  in the  industry.  The  license  agreement  continues  in effect on a
country-by-country  and licensed  product-by-licensed  product basis until there
are no remaining  royalty  payment  obligations in a country,  at which time the
license shall expire in its entirety in such country. Upon such expiration,  the
Company shall have a non-exclusive, irrevocable, fully paid-up right and license
to use and exploit the  proprietary  know-how.  Either party may  terminate  the
license agreement in the event of a material breach by the other party.

    Eli Lilly & Company.  The Company entered into a license  agreement with Eli
Lilly & Company ("Eli  Lilly") in June 1994.  Under the license  agreement,  Eli
Lilly has granted to Jenner an exclusive  worldwide  license under a U.S. patent
(and all additional patents issuing therefrom and corresponding  foreign patents
issued in connection  therewith) to manufacture and commercialize  products that
contain the KSA antigen (the antigen  associated  with  OncoVax-CL).  Jenner may
grant and authorize sub-licenses under its license. Except as expressly provided
in the agreement,  Eli Lilly is not obligated 

                                       29





under the  license  grant to provide the  Company  any  know-how  related to the
patent rights.  In consideration  for the license grant,  Jenner has paid to Eli
Lilly an up-front  license fee and is obligated to pay certain  patent  issuance
fees and to make certain  milestone  payments upon the first  anniversary of the
initiation of Phase III clinical trials of the first product  incorporating  the
KSA antigen  (regardless  of the outcome of the trial) and upon FDA  approval to
market the first such  product.  In  addition,  the Company is  obligated to pay
running  royalties to Eli Lilly based on the net sales of licensed products sold
by  the  Company  or  any  sublicensee.  Royalties  are  due  and  payable  on a
country-by-country  basis until the  expiration  of the patent  covering the KSA
antigen in such country.  Jenner has an obligation to use reasonable  efforts to
develop,  gain regulatory approval and market at least one product using the KSA
antigen.  The license agreement  continues in effect until the expiration of the
last licensed  patent.  Either party may terminate the license  agreement in the
event of a material breach by the other party.

    Research  Corporation  Technologies,  Inc. In June 1994, the Company entered
into a license agreement with Research Corporation  Technologies,  Inc. ("RCT"),
an independent technology management company.  Under the license agreement,  RCT
granted to Jenner a  non-exclusive  license under its rights in certain U.S. and
Canadian patents to manufacture and commercialize  products that contain the PSA
antigen (the antigen  associated with  OncoVax-P) as a prophylactic  vaccine for
prostate  cancer and/or a therapeutic  vaccine for prostate cancer in the United
States and Canada. Jenner may grant to up to three third party sublicenses under
its  license.  The  Company  has the option to extend the license to include the
territory  of Japan if  certain  pending  patent  applications  filed by RCT are
issued in Japan. In consideration for the license grant, the Company has paid to
RCT an up-front  license fee and is obligated to pay running  royalties based on
the net sales of licensed  products sold by the Company or any sublicensee.  The
royalty  obligation  begins with the first commercial sale of a licensed product
and  terminates  upon  termination  of  the  license  agreement.  Jenner  has an
obligation  to  exercise  diligence  consistent  with  its  reasonable  business
judgment  in  developing,   testing,   manufacturing   and  marketing   products
incorporating the PSA antigen.  The license agreement  continues in effect until
the  expiration  of the last  licensed  patent.  RCT may  terminate  the license
agreement in the event of a material breach by Jenner.

    Walter  Reed  Army  Institute  of  Research.  The  Company  entered  into  a
Cooperative  Research and Development  Agreement  ("CRADA") with the Walter Reed
Army  Institute of Research  ("WRAIR")  in October  1993.  Under the CRADA,  the
Company is  sponsoring  research to develop and optimize  liposomal and emulsion
formulations of the Company's  cancer vaccines.  Under a separate  non-exclusive
worldwide  license  agreement with WRAIR entered into in March 1996, the Company
also  licensed a certain  patent  application  related to a special  process for
making the liposomes  necessary for the  formulation of the Company's  vaccines.
The CRADA provides that  inventions  developed  solely by one party are owned by
that party and inventions developed jointly are owned by both parties;  provided
however that Jenner is obligated to provide the U.S. government a non-exclusive,
fully  paid-up,  worldwide  license  under any patents  covering  any  invention
developed  under the CRADA;  and  provided  further that Jenner has an option to
acquire an exclusive  license under any patent covering any invention  developed
under  the  CRADA in which  WRAIR  (on  behalf  of the U.S.  government)  has an
interest  (subject to the  reservation of a nonexclusive,  irrevocable,  paid-up
license to practice and have  practiced the subject  inventions on behalf of the
U.S.  government).  If Jenner elects to exercise  such option,  then it would be
obligated to make certain  milestone  payments and royalty payments based on net
sales of products covered by the licensed patents. The CRADA continues in effect
until  December 15, 1997,  although  either party may  terminate  the  agreement
earlier upon 30 days prior written notice.  The license agreement  requires that
the Company make certain  milestone  payments  upon the  conclusion  of Phase I,
Phase II and  Phase  III  clinical  trials of  products  manufactured  using the
licensed  liposome  formulation  process and certain  royalty  payments to WRAIR
based on the net  sales of such  products.  The  term of the  license  agreement
extends to the  expiration  of the last to expire of the  patents  covering  the
technology.

MARKETING AND DISTRIBUTION

    The Company currently has no marketing and sales resources or personnel.  As
the Company's product  candidates  advance through the regulatory  process,  the
Company generally intends to establish  strategic  alliances with pharmaceutical
companies and other corporate partners with large distribution systems to market
and sell the Company's products worldwide.  In some cases, the Company may grant

                                       30






marketing  and  distribution  rights in exchange  for  payment by the  strategic
partner  of the costs and  expenses  related  to the  Phase III  clinical  trial
relating to the particular product.  With respect to ACT, the Company intends to
establish  a direct  sales force to market such  product  for the  treatment  of
osteogenic  sarcoma in the United  States.  The Company  believes  that a direct
sales force may be effective for this indication  because most of the physicians
specializing  in this area are located at a small number of well-known  clinical
institutions,  most of which are  participating in the Phase III clinical trials
for ACT.

MANUFACTURING AND SUPPLY

    The Company  does not have and does not intend to acquire or  establish  its
own dedicated manufacturing  facilities in the foreseeable future. The Company's
manufacturing   strategy   is  to   develop   relationships   with   established
pharmaceutical manufacturers for production of all of its product candidates and
liposomal  formulations.  At the present time, the Company has  arrangements  in
place for manufacturing  and supply of ACT,  OncoVax-P and OncoVax-CL to support
its current  clinical  trials.  However,  the Company  anticipates  that current
manufacturers of these products will not necessarily  manufacture these products
in  subsequent  clinical  trials,  and will not  manufacture  the  products  for
commercial use should the clinical trials be successful and regulatory  approval
be  obtained.   As  a  result,   the  Company  will  need  to  obtain  alternate
manufacturing sources for its products.  Applicable regulations require that, if
the  manufacturing  source  of  products  such  as  the  Company's  vaccines  or
macrophage  activators  is  changed,  equivalency  must be  demonstrated  before
patients are treated with product from the new  manufacturer.  The demonstration
of such  equivalency may require that  additional  clinical trials be conducted.
There is no assurance that the Company will be able to  demonstrate  equivalency
and the effort to do so may require  significant  expenditures of money and time
which could have a material adverse effect on the Company.

    The  Company is  currently,  and will  continue  to be,  dependent  on third
parties for  manufacturing  clinical  and  commercial  scale  quantities  of its
products.  At the present time, the Company  believes that there are a number of
facilities  with FDA  approval  that have the  capability  of  synthesizing  and
manufacturing  the Company's  product  candidates  and  liposomal  formulations.
However,  the process for  manufacturing  and formulating the Company's  product
candidates  is complex and subject to  uncertainties.  There can be no assurance
that  the  Company  will  be  able  to  maintain  existing  agreements  for  the
manufacturing of clinical quantities of products,  that it will be able to enter
into  additional  agreements  with other  third  parties  for  commercial  scale
manufacturing, or that contract manufacturers will be able to adequately produce
the Company's  products in commercial  quantities  in a  cost-effective  manner.
Interruptions  or  difficulties  in clinical  or  commercial  production  of the
Company's products may require the Company to incur substantial costs to address
the situation, which could have a material adverse effect on the Company.

PATENTS AND PROPRIETARY RIGHTS

    The Company believes that patent and trade secret protection is important to
its business  and that its future  success will depend in part on its ability to
maintain its  technology  licenses,  protect trade  secrets,  obtain patents and
operate without infringing the proprietary rights of others,  both in the United
States and in other countries.  With respect to ACT and JT3002,  there are seven
United States patents and 101 foreign patents which have issued,  and 28 foreign
patents pending, all of which are under an exclusive, worldwide, royalty-bearing
license from Novartis. With respect to OncoVax-P,  there is United States patent
and  one   Canadian   patent,   both  of  which  are   under  a   non-exclusive,
royalty-bearing  license from RCT,  and one United  States  patent  pending with
counterpart filings pending in Australia,  Canada, Europe and Japan owned by the
Company.  With respect to  OncoVax-CL,  there is one United  States  patent with
counterpart   foreign   filings,   all  of  which   are   under  an   exclusive,
royalty-bearing  license from Eli Lilly,  and one United States  patent  pending
with counterpart filings pending in Australia, Canada, Europe and Japan owned by
the  Company.  In  addition,  there  are two  additional  United  States  patent
applications with counterpart  foreign filings  applicable to both OncoVax-P and
OncoVax-CL, one of which is under a non-exclusive,  royalty-bearing license from
WRAIR,  and one of which is  co-owned by the Company and WRAIR (on behalf of the
U.S. Government).

    The  pharmaceutical  and  biotechnology  fields are characterized by a large
number of patent filings,  and a substantial number of patents have already been
issued to other companies. Third parties may have filed applications for or have
been issued patents and may obtain  additional  patents and  proprietary


                                       31




rights related to products or processes  competitive with or similar to those of
the  Company.  The Company  may not be aware of all of the  patents  potentially
adverse to the  Company's  interests  that may have been  issued to  others.  No
assurance can be given that such patents do not exist,  have not been filed,  or
could not be filed or issued,  which  contain  claims  relating to the Company's
technology,  products or processes. If patents have been or are issued to others
containing  preclusive  or  conflicting  claims and such  claims are  ultimately
determined to be valid, the Company may be required to obtain licenses to one or
more of such patents or to develop or obtain alternate technology.  There can be
no  assurance  that the  licenses  that  might  be  required  for the  Company's
processes or products would be available on commercially acceptable terms, or at
all.

    Because  of the  substantial  length  of time and  expense  associated  with
bringing new products to the marketplace  through the development and regulatory
approval process, the biotechnology  industry places considerable  importance on
patent and trade secret protection for new technologies, products and processes.
Since patent  applications  in the United States are maintained in secrecy until
patents issue and since  publication  of discoveries in the scientific or patent
literature  often lag behind actual  discoveries,  the Company cannot be certain
that it (or any  licensor)  was the  first to make  the  inventions  covered  by
pending patent  applications  or that it (or any licensor) was the first to file
patent  applications  for such  inventions.  The patent positions of vaccine and
biotechnology  companies can be highly  uncertain and involve  complex legal and
factual  questions,  and therefore the breadth of claims  allowed in vaccine and
biotechnology patents or their enforceability, cannot be predicted. There can be
no assurance that any patents under pending patent  applications  or any further
patent applications will be issued. Furthermore,  there can be no assurance that
the  scope  of  any  patent  protection  will  exclude  competitors  or  provide
competitive  advantages to the Company,  that any of the Company's  patents that
have issued or may be issued will be held valid if  subsequently  challenged  or
that  others,  including  competitors  or  current  or former  employers  of the
Company's  employees,  advisors  and  consultants,  will not claim  rights in or
ownership to the patents and other proprietary rights held by the Company. There
can be no assurance  that others will not  independently  develop  substantially
equivalent  proprietary  information or otherwise obtain access to the Company's
proprietary  information  or that  others  may not be  issued  patents  that may
require  licensing  and the  payment of  significant  fees or  royalties  by the
Company.  The Company's breach of any existing license  agreement or the failure
to obtain a  license  to  technology  required  to  commercialize  its  products
candidates may have a material adverse effect on the Company.

    The biotechnology  industry has experienced  extensive  litigation regarding
patent and other intellectual  property rights.  Accordingly,  the Company could
incur substantial costs in defending itself in suits that may be brought against
the Company claiming infringement of the patent rights of others or in asserting
the Company's  patent rights in a suit against  another  party.  The Company may
also be required to  participate  in  interference  proceedings  declared by the
United  States Patent and Trademark  Office for the purpose of  determining  the
priority of inventions in connection with the patent applications of the Company
or  other  parties.   Adverse   determinations  in  litigation  or  interference
proceedings  could  require  the  Company  to seek  licenses  (which  may not be
available  on  commercially   reasonable   terms)  or  subject  the  Company  to
significant  liabilities to third parties,  and could  therefore have a material
adverse effect on the Company.  Even if the Company  prevails in an interference
proceeding  or a lawsuit,  substantial  resources of the Company,  including the
time and attention of its officers, will be required.

    The  Company  also  relies  on trade  secrets,  know-how  and  technological
advancement  to maintain  its  competitive  position.  Although the Company uses
confidentiality  agreements and employee  proprietary  information and invention
assignment  agreements  to  protect  its  trade  secrets  and  other  unpatented
know-how,  these  agreements  may be breached by the other party  thereto or may
otherwise be of limited effectiveness or enforceability.

     The  Company  is  aware  of a  company  that has  filed  an  intent  to use
application in the United States Patent and Trademark  Office for the mark "Onco
Vax" relating to  therapeutic  vaccines for  oncological  purposes.  The Company
believes that it has superior  rights to use "OncoVax" based upon its public use
of the mark in  technical  journals  prior to the  effective  filing date of the
intent to use  application.  However,  there can be no assurance in this regard,
and the Company may be required to discontinue using "OncoVax" as a name for its
products.

                                       32





GOVERNMENT REGULATION

    General. Testing, manufacturing,  labeling,  advertising,  promotion, export
and  marketing,  among other things,  of the  Company's  products are subject to
extensive regulation by governmental  authorities in the United States and other
countries.  In the United States,  pharmaceutical  products are regulated by the
FDA under the Federal Food, Drug, and Cosmetic Act and other laws, including, in
the case of biologics,  the Public Health  Service Act. At the present time, the
Company  believes  that  its  immunotherapeutics  that  it may  develop  will be
regulated by the FDA as biologics.

    The steps  required  before a drug or biologic may be approved for marketing
in the United States  generally  includes (i) preclinical  laboratory and animal
testing,  (ii) the submission to the FDA of an IND for human  clinical  testing,
which must become  effective  before human clinical  trials may commence,  (iii)
adequate and  well-controlled  human clinical trials to establish the safety and
efficacy of the product,  (iv) in the case of a biologic,  the submission to the
FDA of a biologic license  application  ("BLA"), or in the alternative a Product
License  Application  ("PLA")  for  the  product  and an  Establishment  License
Application ("ELA") for the facility at which the product is manufactured, or in
the case of a drug, a New Drug  Application  ("NDA"),  (v) FDA review of the BLA
(or PLA/ELA) or NDA, and (vi)  satisfactory  completion of an FDA  inspection of
the  manufacturing  facilities at which the product is made to assess compliance
with cGMPs. The testing and approval process requires  substantial  time, effort
and financial resources, and there can be no assurance that any approval will be
granted on a timely basis, if at all.

    Preclinical studies include laboratory evaluation of the product, as well as
animal studies to assess the potential  safety and efficacy of the product.  The
results of the preclinical studies,  together with manufacturing information and
analytical  data, are submitted to the FDA as part of the IND, which must become
effective before clinical trials may be commenced.  The IND  automatically  will
become  effective 30 days after receipt by the FDA,  unless the FDA, before that
time,  raises  concerns or questions about the trials as outlined in the IND and
places a clinical  hold on the trials.  In such case, an IND sponsor and the FDA
must resolve any outstanding concerns before clinical trials can proceed.

    Clinical trials involve the administration of the investigational product to
healthy  volunteers or patients under the  supervision of a qualified  principal
investigator.  In the case of Jenner's  products,  it is anticipated that trials
will be conducted in patients with cancer,  not healthy subjects.  Each clinical
trial must be reviewed and approved by an independent Institutional Review Board
("IRB") at each  institution at which the study will be conducted.  The IRB will
consider,  among other things, ethical factors, the safety of human subjects and
possible liability of the institution.

    Clinical trials typically are conducted in three sequential  phases, but the
phases may overlap. In Phase I, the initial  introduction of the drug into human
subjects,  the drug is  usually  tested  for safety  (adverse  effects),  dosage
tolerance, absorption, metabolism, distribution, excretion and pharmacodynamics.
While safety  testing in the Phase I trial applies to all of Jenner's  products,
the Company  believes  that the other items may not be applicable in the case of
its vaccine  candidates.  Phase II clinical  trials usually involve studies in a
limited  patient  population  to (i)  evaluate  the  efficacy  of the  drug  for
specific,  targeted  indications,  (ii) determine  dosage  tolerance and optimal
dosage and (iii) identify  possible adverse effects and safety risks.  Phase III
clinical trials further evaluate  clinical  efficacy and test further for safety
within an expanded patient  population.  There can be no assurance that Phase I,
Phase II or Phase III testing will be completed successfully within any specific
time period, if at all, with respect to any of the Company's product candidates.
Furthermore, the FDA may suspend clinical trials at any time on various grounds,
including  a finding  that the  subjects  or  patients  are being  exposed to an
unacceptable health risk.

    Phase IV clinical  trials are conducted  after  approval to gain  additional
experience from the treatment of patients in the intended therapeutic indication
and to document safety and clinical  benefit in the case of drugs approved under
accelerated approval regulations.  If the FDA approves a product while a company
has ongoing clinical trials that were not necessary for approval,  a company may
be able to use the data from  these  clinical  trials to meet all or part of any
Phase IV clinical trial requirement. These clinical trials are often referred to
as "Phase III/IV  post-approval  clinical  trials."  Failure to promptly conduct
Phase IV clinical  trials,  if required,  could result in withdrawal of products
approved under accelerated approval regulations.

                                       33





    The results of the preclinical  studies and clinical  trials,  together with
detailed  information on the  manufacture  and  composition of the product,  are
submitted to the FDA in the form of a BLA or PLA/ELA,  or in the case of a drug,
NDA,  requesting  approval  to market the  product.  Before  approving  a BLA or
PLA/ELA or NDA,  the FDA will  inspect  the  facilities  at which the product is
manufactured and will not approve the product unless the manufacturing  facility
is in compliance with cGMPs. The FDA may delay regulatory approval if applicable
regulatory   criteria  are  not  satisfied,   require   additional   testing  or
information,  and/or require post marketing  testing and surveillance to monitor
safety or efficacy of a product.  There can be no assurance  that any regulatory
submission  submitted by the Company will be accepted on a timely  basis,  if at
all.  Also,  if regulatory  approval of a product is granted,  such approval may
entail limitations on the indicated uses for which such product may be marketed.

    In 1988, the FDA issued "fast-track"  regulations intended to accelerate the
approval  process  for  the   development,   evaluation  and  marketing  of  new
therapeutic and diagnostic products used to treat  life-threatening and severely
debilitating   illnesses,   especially  for  those  for  which  no  satisfactory
alternative therapy exist.  "Fast-track" designation provides the opportunity to
interact early with the FDA in terms of protocol design,  and permits,  although
it does not  require  the FDA to grant  approval  after  completion  of Phase II
clinical  trials  (although  the FDA may require  subsequent  Phase III clinical
trials or even  post-approval  Phase IV safety  and/or  efficacy  studies).  The
Company  believes that a number of its product  candidates may fall within these
regulations,  but there can be no assurance  that any of the Company's  products
will receive this or other  similar  regulatory  treatment,  or will be approved
under accelerated approval regulations.

    Orphan Drug Designation. Under the Orphan Drug Act, the FDA may grant orphan
drug designation to drugs intended to treat a "rare disease or condition," which
is generally a disease or condition that affects fewer than 200,000  individuals
in  the  United  States.  Orphan  Drug  Designation  must  be  requested  before
submitting a BLA or PLA/ELA, or in the case of a drug, NDA. After the FDA grants
Orphan Drug  Designation,  the generic identity of the therapeutic agent and its
potential orphan use are disclosed  publicly by the FDA. Orphan Drug Designation
does not convey any  advantage  in, or shorten the duration  of, the  regulatory
review and  approval  process.  If a product  that has Orphan  Drug  Designation
subsequently  receives  FDA approval  for the  indication  for which it has such
designation, the product is entitled to orphan exclusivity, i.e. the FDA may not
approve any other  applications  to market the same drug for the same indication
except in very limited circumstances, for seven years. There can be no assurance
that  competitors  will  not  receive  approval  of  other,  different  drugs or
biologics  for the  same  indications  sought  by the  Company.  Thus,  although
obtaining FDA approval to market a product with Orphan Drug  exclusivity  can be
advantageous, there can be no assurance that it would provide the Company with a
material commercial benefit.

    Foreign Regulations. Whether or not FDA approval has been obtained, approval
of a product by comparable  regulatory  authorities in foreign  countries may be
necessary prior to  commencement of marketing the product in such countries.  In
certain  instances,  the Company may seek approval to market and sell certain of
its products  outside of the United States before  submitting  applications  for
U.S.  approval  to the  FDA.  The  regulatory  procedures  for  approval  of new
pharmaceutical products vary significantly among foreign countries. The clinical
testing  requirements  and  the  time  required  to  obtain  foreign  regulatory
approvals may differ from that required for FDA approval.  Although there is now
a centralized  European  Community ("EU") approval  mechanism in place,  each EU
country may  nonetheless  impose its own  procedures and  requirements,  many of
which are time consuming and expensive. Thus, there can be substantial delays in
obtaining   required   approvals  from  both  the  FDA  and  foreign  regulatory
authorities  after the  relevant  applications  are filed,  and  approval in any
single  country  may  not be a  meaningful  indication  that  the  product  will
thereafter be approved in another country.

COMPETITION

    There are many  companies,  both  publicly  and  privately  held,  including
well-known  pharmaceutical  companies,  as well as academic  and other  research
institutions, that are engaged in the discovery, development, marketing and sale
of products  for the  treatment  of cancer.  These  include  new  pharmaceutical
products  and  new  biologically   derived  products,   including  vaccines  and
macrophage activators.  The Company expects to encounter significant competition
for its product  candidates  from 


                                       34




traditional  and new  treatment  methods.  The  Company  is aware of a number of
companies that have products based on immunoactivation principles or intended to
treat the  indications  targeted by the  Company,including  Avigen,  Inc.,  Akzo
Pharma  Group,  Aphton  Corp.,  Biomira,   Inc.,  Cell  Genesys,  Inc.,  Cel-Sci
Corporation,  Centocor,  Inc., Corixa Corporation,  Cytel Corp.,  EndoRex Corp.,
Epigen,  Inc.,  IDEC  Pharmaceutical  Corp.,  ImClone  Systems,   Inc.,  Janssen
Pharmaceuticals  (a  division  of Johnson & Johnson),  Medarex,  Inc.,  Oncogene
Science,  Inc., RIBI ImmunoChem Research,  Inc.,  Schering-Plough Corp., Therion
Biologics   Corporation,   Chiron  Viagene,   Inc.  and  Vical,   Inc.   Janssen
Pharmaceuticals  and  Schering-Plough  Corp.  recently received FDA clearance to
market  products  in the  United  States  for  surgical  adjuvant  treatment  of
colorectal  carcinoma and melanoma,  respectively,  and Centocor,  Inc. recently
received  approval  to market a product in Germany for the  adjuvant  therapy of
colorectal cancer.

    The  Company  believes  that its  competitive  success  will be based on its
ability to license and maintain  scientifically  advanced technology,  establish
and maintain key research, manufacturing and distribution relationships,  obtain
required regulatory approvals,  attract and retain scientific personnel,  obtain
patent or other  protection for its products,  and manufacture and  successfully
market its products either independently or through collaborative partners. Most
of the  Company's  competitors  and  potential  competitors  have  substantially
greater capital,  research and development capabilities and human resources than
the Company.  Furthermore,  many of these competitors have significantly greater
experience  than the Company in  undertaking  preclinical  testing and  clinical
trials of new  biotechnology  products and  obtaining  FDA and other  regulatory
approvals.  If the  Company is  permitted  to commence  commercial  sales of any
product,  it will also be competing with  companies that have greater  resources
and experience in manufacturing,  marketing and sales. The Company's competitors
may succeed in developing products that are more effective, less costly, or have
a better side effect profile than any that may be developed by the Company,  and
such  competitors  may also  prove to be more  successful  than the  Company  in
manufacturing,  marketing  and sales.  If the  Company  is able to  successfully
commercialize a product,  subsequent competitive  developments could render such
product noncompetitive or obsolete.

PRODUCT LIABILITY AND INSURANCE

    The Company's business exposes it to potential product liability risks which
are inherent in the manufacturing,  clinical testing, marketing and use of human
therapeutic  products.  The Company  currently  carries clinical trial liability
insurance  in the  amount of $1  million  per  occurrence  and $1 million in the
aggregate,  although this insurance does not currently  cover the on-going Phase
III clinical trial for ACT.  There can be no assurance that the coverage  limits
of the Company's  insurance  policy will be adequate,  and a successful claim in
excess of the  coverage  limits  could  have a  material  adverse  effect on the
Company.  The Company plans to obtain product liability  insurance  covering the
commercial sale of its products prior to their commercial introduction, however,
there can be no  assurance  that the Company  will be able to obtain or maintain
such insurance on acceptable  terms or that any insurance  obtained will provide
adequate coverage against potential  liabilities.  Claims or losses in excess of
any liability  insurance  coverage now carried or  subsequently  obtained by the
Company could have a material adverse effect on the Company.

SCIENTIFIC ADVISORY BOARD

    The Company has assembled a Scientific Advisory Board which meets for a full
day once a quarter to discuss  areas of scientific  and medical  interest to the
Company.  The Company uses the ideas and information from these meetings to help
determine the direction of the Company's scientific  endeavors.  The Company has
entered  into  agreements  with each  member of the  Scientific  Advisory  Board
providing that all  inventions  made by such member when working for the Company
belong to the Company.  The Company has granted options to purchase Common Stock
to most  members of the  Scientific  Advisory  Board as  compensation  for their
efforts,  and intends to continue to do so in the future. The Company provides a
cash stipend of $1,000 per month to certain  members of the Scientific  Advisory
Board.  The  members  of the  Scientific  Advisory  Board  and  their  principal
positions and experience are set forth below:

    Michael Mastrangelo, M.D. Dr. Mastrangelo is Chairman of Jenner's Scientific
Advisory  Board and a Professor of Medicine and Associate  Clinical  Director of
the Cancer Center at Jefferson Medical College. Dr. Mastrangelo has been working
in cancer  immunotherapy and vaccine  development for over 25 years, is founding
Editor of Seminars in Oncology,  and past President of the Society of Biological
Therapy.


                                       35






    Stuart A.  Aaronson,  M.D. Dr.  Aaronson is the  Director of the  Ruttenberg
Cancer Center,  Mount Sinai Medical  Center,  New York. He was formerly Chief of
the  Laboratory  of  Cellular  and  Molecular  Biology  at the  National  Cancer
Institute and, before that,  head of the Molecular  Biology Section of the Viral
Carcinogenesis  Branch  of the  National  Cancer  Institute.  He  serves  on the
Editorial Boards of several  journals,  including the  International  Journal of
Oncology and Onocology Research.

    Byron  William  Brown,  Ph.D.  Dr.  Brown  is  the  former  Chairman  of the
Department of Health,  Research and Policy and a Professor and Head, Division of
Biostatistics,   at  Stanford   University.   Dr.  Brown  is  a  member  of  the
International  Institute of Statistics  and the Institute of Medicine,  National
Academy of Sciences.  He served on the Editorial Board of Statistics in Medicine
and was head of the  Statistical  Office for the  Northern  California  Oncology
Group.

    Isaiah J. Fidler  D.V.M.,  Ph.D. Dr. Fidler holds the R.E. "Bob" Smith Chair
in Cell  Biology  and is a Professor  and  Chairman  in the  Department  of Cell
Biology at the University of Texas, M.D. Anderson Cancer Center. Dr. Fidler is a
past  President  of the  American  Association  for  Cancer  Research  and is an
Associate  Editor of several  journals  including  Cancer  Research,  Journal of
Immunotherapy,  Selective  Cancer  Therapies,  and  Melanoma  Research.  He  has
published over 400 articles in the area of cancer metastases and immunology.

    Philip O.  Livingston,  M.D.  Dr.  Livingston  is a Member  of the  Memorial
Sloan-Kettering Cancer Center and Attending Physician on the clinical immunology
service at Memorial  Hospital in New York City. Dr. Livingston has worked in the
area of evaluating  immune  responses in cancer  patients and in cancer  vaccine
development  for over 20 years.  He was the leader of a group which  developed a
vaccine  which is currently in a Phase III clinical  trial for the  treatment of
melanoma being conducted by two clinical cooperative groups.

    Jeffrey  Schlom,  Ph.D.  Dr.  Schlom  is  Chief of the  Laboratory  of Tumor
Immunology  and  Biology,  Division  of Basic  Sciences at the  National  Cancer
Institute.  Dr. Schlom has worked in the area of tumor immunotherapy for over 20
years and has published over 400 manuscripts.

    Lynn E. Spitler,  M.D. Dr. Spitler is the founder of Jenner and has been its
President and Chief  Scientific  Officer since  December  1992.  Dr. Spitler has
worked in the area of cancer therapy for over 25 years. Dr. Spitler was formerly
Senior Vice President of Xoma Corporation.  She serves on the Editorial Board of
Cancer Biotherapy and  Radiopharmaceuticals and was on the Board of Directors of
the Society of  Biological  Therapy  until her term was  completed in 1996.  Dr.
Spitler received the Dernham Senior  Fellowship from the American Cancer Society
from 1969 to 1971 and the Research  Career  Development  Award from the National
Institutes of Health from 1971 to 1976.

    James E. Talmadge,  Ph.D.  Dr.  Talmadge is a Professor in the Department of
Pathology and  Microbiology at the University of Nebraska  Medical  Center.  Dr.
Talmadge  is or has  been an  Associate  Editor  and  board  member  of  several
journals, including Cancer Research, Cancer Immunology and Immunotherapy and The
Journal  of  Immunology.  He was  formerly  head  of the  Preclinical  Screening
Laboratory  of the  National  Cancer  Institute  --  Frederick  Cancer  Research
Facility.

    Carl R. Alving,  M.D.  (ex officio,  CRADA  representative).  Dr.  Alving is
Chief,  Department  of  Membrane  Biochemistry,  Walter Reed Army  Institute  of
Research.  He was elected to the rank of Fellow of the American  Association for
the  Advancement of Science for studies on the practical  uses of liposomes.  He
holds numerous  patents and has developed  liposomal  inventions as vehicles for
vaccines. He also serves on the Editorial Boards of several journals,  including
the Journal of Immunological Methods and Vaccine Research.

    Anthony E. Maida, III, M.B.A. (ex officio, Management  representative).  Mr.
Maida has been the Company's Chief Executive Officer since December 1992, and is
responsible for operations,  business development and strategic  direction.  Mr.
Maida actively  participates in all Company  Scientific Board meetings.  He is a
member of the Genetic and Environmental  Toxicology Association,  the Society of
Toxicology and the American Chemical Society.


                                       36






EMPLOYEES AND FACILITIES

    As of December 31, 1996, the Company had five employees,  of whom three were
involved  in  research  and  development  and two were  involved  in finance and
administration. The Company believes that its relationship with its employees is
good.

    The Company leases  approximately 200 square feet of office space located in
San Ramon,  California.  The Company  intends to lease an additional  600 square
feet in the same  location in the second  quarter of 1997.  The lease expires in
December  1997.  The  Company  intends  to lease  additional  space as needed to
accommodate  an increase in personnel and believes  that adequate  space will be
available to do so.

LEGAL PROCEEDINGS

    The Company is not involved in any legal proceedings.
















                                       37





                                   MANAGEMENT

EXECUTIVE OFFICERS, DIRECTORS AND KEY EMPLOYEES

    The  executive  officers,  directors  and key employees of the Company as of
January 31, 1997 are as follows:




                  NAME                       AGE                    POSITION
                  ----                       ---                    --------
                                              
Lynn E. Spitler, M.D..                        58    President, Chief Scientific Officer,
                                                      Director

Anthony E. Maida, III                         44    Chief Executive Officer, Chief Financial
                                                     Officer, Director

Thomas P.H. Twaddell, M.D.                    59    Vice President of Clinical Research and
                                                     Product Development

Larry E. Moore                                54    Treasurer

Jack L. Bowman(2)                             64    Director

Lowell M. Dicke(1)                            57    Director

Isaiah J. Fidler, D.V.M., Ph.D.               60    Director

Robert A. Fildes, Ph.D(1)                     58    Director

Herbert Grossman(1)                           66    Director

Hayden Leason(1)                              66    Director



- -----------
(1) Member of the Audit Committee.

(2) Member of the Compensation Committee.


    All directors hold office until the next annual meeting of stockholders  and
until their  successors  are duly  elected.  Officers  are  appointed  to serve,
subject to the discretion of the Board of Directors,  until their successors are
appointed.

    Lynn E. Spitler,  M.D., is the founder of Jenner and has been its President,
Chief  Scientific  Officer and a director since  inception in December 1992. Dr.
Spitler has worked in the area of cancer  therapy for over 25 years,  and, prior
to founding the Company, Dr. Spitler was among the founders of Xoma Corporation,
a cancer therapy  company,  where she was Senior Vice President for seven years.
Since March 1991, she has been the Director of the Northern  California Melanoma
Center,  a melanoma  clinical  practice group.  She also serves on the Editorial
Board of  Cancer  Biotherapy  and  Radiopharmaceuticals  and was on the Board of
Directors of the Society of  Biological  Therapy until her term was completed in
1996.  Dr.  Spitler  received the Dernham  Senior  Fellowship  from the American
Cancer Society from 1969 to 1971 and the Research Career  Development Award from
the National  Institutes of Health from 1971 to 1976. Dr.  Spitler  received her
M.D. from the University of Michigan Medical School in 1963.

    Anthony E. Maida,  III, has been Chief  Executive  Officer,  Chief Financial
Officer and a director of the Company since  inception in December  1992, and is
responsible  for the Company's  operations,  business  development and strategic
direction.  From  1990 to  November  1992,  Mr.  Maida was  President  and Chief
Executive Officer of Cellpath,  Inc, a biotechnology company. Prior to that, Mr.
Maida spent ten years with  Lockheed  Corporation,  a designer and  developer of
defense and space  technology,  where he most recently  served as Vice President
and Chief Financial  Officer of a subsidiary of Lockheed.

                                       38






He is a member of the  Genetic and  Environmental  Toxicology  Association,  the
Society of Toxicology and the American Chemical  Society.  Mr. Maida received an
M.S. in Toxicology  from San Jose State  University  in 1986 and an M.B.A.  from
Santa Clara University in 1978.

    Thomas  P.H.  Twaddell,  M.D.,  joined the  Company in January  1997 as Vice
President of Clinical  Research and Product  Development.  Dr. Twaddell has more
than 10 years of experience  in managing  clinical  trials and FDA  submissions.
From June 1991 until January 1997, Dr. Twaddell was a Clinical  Scientist in the
Immunology-Oncology  department of  Genentech,  Inc., a  biotechnology  company.
Prior to that,  he was the  Director  of  Gastroenterology  for Glaxo,  Inc.,  a
pharmaceutical  company , where he was  responsible  for the NDA submissions and
FDA  interactions  for  Zofran,  a drug for  prevention  of nausea and  vomiting
associated  with  chemotherapy.  Prior  to  that,  he was an  Associate  Medical
Director at Sandoz  Pharmaceutical  Corporation,  a pharmaceutical  company. Dr.
Twaddell received his M.D. from the University of Pennsylvania in 1963.

    Larry E. Moore,  has been a  consultant  to the Company  since  inception in
December 1992 and was appointed as Treasurer in January 1997. For the past eight
years, Mr. Moore has been a self-employed financial and accounting consultant to
companies  in  several  industries,   including  medical  research,   electronic
manufacturing  and real  estate  development.  Mr.  Moore  received  his B.S. in
Accounting  from  the San  Diego  State  University  and is a  certified  public
accountant.

    Jack L. Bowman  joined the Company as a member of the Board of  Directors in
December 1993. Since January 1994, Mr. Bowman has been retired.  From 1987 until
December  1993,  Mr. Bowman was Company Group  Chairman at Johnson & Johnson,  a
health care  company.  Mr. Bowman is a member of the Board of Directors of NeoRx
Corp., Cell Therapeutics, Inc., PharmaGenics, Inc. and CytRx Corp., all of which
are publicly  traded  companies.  Mr. Bowman received his B.A. in Education from
Western Washington University.

    Lowell M. Dicke  joined the Company as a member of the Board of Directors at
its  inception  in  December  1992.  Mr.  Dicke has served as  President,  Chief
Financial Officer and Director of Diversified Investors Corporation,  a publicly
held  investment  company,  since December  1994.  From January 1990 to December
1994, Mr. Dicke was self-employed as a financial consultant.  Mr. Dicke received
a J.D. from Yale University.

    Isaiah J. Fidler,  D.V.M., Ph.D. joined the Company as a member of the Board
of Directors in July 1996.  Dr. Fidler holds the R.E.  "Bob" Smith Chair in Cell
Biology and is Chairman of the  Department of Cell Biology at the  University of
Texas,  M.D.  Anderson Cancer Center,  where he has been a professor since 1983.
Dr. Fidler is a past President of the American  Association  for Cancer Research
and is an  Associate  Editor of  several  journals  including  Cancer  Research,
Journal  of  Biological  Response  Modifiers,  Selective  Cancer  Therapies  and
Melanoma Research. Dr. Fidler received his D.V.M. from Oklahoma State University
in 1963 and his Ph.D. in Pathology from the University of Pennsylvania in 1970.

    Robert A.  Fildes,  Ph.D.  joined  the  Company  as a member of the Board of
Directors at its inception in December  1992.  Dr. Fildes has served as Chairman
and Chief  Executive  Officer of  Scotgen  Biopharmaceuticals,  a  biotechnology
company,  since February 1993. From January 1991 to January 1993, Dr. Fildes was
self-employed  as a  biotechnology  consultant.  From  1982 to 1990,  he was the
President and Chief Executive Officer of Cetus  Corporation,  which was acquired
by Chiron  Corporation  in 1991.  In 1978,  Dr.  Fildes  became  the first  U.S.
employee of Biogen, Inc., a biotechnology  company,  where he worked until 1981.
Dr. Fildes is a member of the Board of Directors of Carrington Laboratories Inc.
and La Jolla Pharmaceuticals,  both of which are publicly traded companies.  Dr.
Fildes  received  his  B.Sc.  in 1961 and a D.C.C.  and  Ph.D.  in 1964 from the
University of London.

    Herbert Grossman joined the Company as a member of the Board of Directors at
its inception in December 1992. Mr. Grossman has served as the President,  Chief
Executive  Officer and  director of Beacon  Laboratories  LLC, a  pharmaceutical
company,  since July 1995.  From  October  1992 until June 1995,  he served as a
consultant to Ortho Diagnostics  Systems, a diagnostic company and a division of


                                       39





Johnson & Johnson. From May 1988 until September 1992, he held various positions
with Zambon Corporation,  a pharmaceutical company, most recently as Chairman of
the Board. Mr. Grossman serves on the Board of Directors of Dermasciences, Inc.,
a publicly  traded  company.  Mr.  Grossman  received his B.S. from the Brooklyn
College of Pharmacy.

    Hayden  Leason  joined the Company as a member of the Board of  Directors in
June 1993. He has served as Chairman of the Board of Advanced Photonics, Inc., a
publicly held company that  manufactures  electrical  equipment,  since November
1996.  From 1992 to October 1996,  Mr. Leason was retired.  In 1964,  Mr. Leason
founded  Filtertek,  now a division of Schawk Inc.  and  manufacturer  of insert
molded filters,  and served as Chief Executive Officer and Chairman of the Board
until 1992.

DIRECTOR COMPENSATION

    Directors  are  not  currently  paid  any  compensation  for  attendance  at
directors' meetings or for attending or participating in any committee, although
the Board  expects to review and may revise its policy in this regard  following
the Offering.  Directors are reimbursed for reasonable out-of-pocket expenses in
connection with attendance at such meetings.

    On December 10, 1992, prior to the Company's  adoption of its 1993 Incentive
Stock Plan,  the Company  granted a stock option to purchase 7,158 shares of the
Company's  Common  Stock at an exercise  price of $0.00693  per share to Herbert
Grossman  in  connection  with his  services as a director  of the  Company.  On
September 18, 1995, in  connection  with his services to the Company,  including
services  as a  director,  the Company  granted to Mr.  Maida a stock  option to
purchase 143,129 shares of Common Stock at an exercise price of $0.21 per share.
On July 29, 1996, in connection  with their  services as directors,  the Company
granted to each of Messrs.  Bowman,  Dicke, Fildes and Grossman stock options to
purchase  7,157  shares of the Company 's Common  Stock at an exercise  price of
$0.23 per share.  On July 29, 1996,  in  connection  with their  services to the
Company,  including  services as directors,  the Company  granted to each of Mr.
Maida and Dr.  Spitler stock options to purchase  28,625 shares of the Company's
Common Stock.  Mr.  Maida's  options are  exercisable at $0.23 per share and Dr.
Spitler's  options are exercisable at $0.24 per share. See " -- Employee Benefit
Plans."

BOARD COMMITTEES

    The  Audit  Committee  of  the  Board  of  Directors  reviews  the  internal
accounting  procedures of the Company and consults with and reviews the services
provided by the Company's  independent auditors.  The Compensation  Committee of
the Board of Directors  reviews and recommends to the Board the compensation and
benefits of all  officers of the Company  and  establishes  and reviews  general
policies relating to compensation and benefits of employees of the Company.

EMPLOYMENT AGREEMENTS

    In November 1994, the Company  executed  employment  agreements with each of
Lynn E.  Spitler,  M.D. and Anthony E. Maida,  III (the  "Executives").  On each
anniversary of the execution date of the employment agreements,  the term of the
employment  agreements is automatically  extended to a date three years from the
respective  anniversary  date,  unless  the  Company  shall  have  provided  the
Executive  with at least 60 days prior  notice to such  anniversary  date of its
intent not to renew the employment agreement.  The employment agreements provide
the Executives with a monthly salary, and medical and vacation benefits together
with the following:  (i) in the event the  Executive's  employment is terminated
without  cause,  the  Executive is entitled to severance  payments  equal to the
Executive's monthly salary computed at the time of such termination payable from
the date employment is terminated to the  termination  date of the agreement and
all accrued benefits and bonuses,  (ii) in the event the Executive's  employment
is  terminated  as a  result  of  the  Company  experiencing  adverse  financial
conditions  (i.e.,  bankruptcy  or cessation of  operations),  the  Executive is
entitled to a payment of up to $50,000  (subject to applicable law) and (iii) in
the event the  Executive's  employment is terminated by death,  the  Executive's
estate is entitled to severance payments equal to the Executive's monthly salary
computed at the time of death payable from the time of death to the  termination
date of the agreement and all accrued benefits and bonuses.


                                       40




EXECUTIVE COMPENSATION

    Summary   Compensation   Table.  The  following  table  sets  forth  certain
information  for the year ended December 31, 1996 regarding the  compensation of
the  Company's  Chief  Executive  Officer  and the  Company's  other most highly
compensated executive officer whose total annual salary and bonus for the fiscal
year ended  December 31, 1996 were in excess of $100,000  (the "Named  Executive
Officers").

                        SUMMARY COMPENSATION TABLE




                                                                                 ANNUAL          LONG-TERM
                                                                              COMPENSATION     COMPENSATION
                                                                              ------------     ------------
                     NAME AND PRINCIPAL POSITION                    YEAR        SALARY($)     OPTIONS/SARS(#)
                     ---------------------------                    ----        ---------    ---------------
                                                                                    
Anthony E. Maida, III                                               1996        $133,333          28,625
 Chief Executive Officer, Chief Financial Officer, Director                

Lynn E. Spitler, M.D.                                               1996        $133,331          28,625
 President, Chief Scientific Officer, Director                             
                                                                

    Option Grants in Last Fiscal Year. The following table sets forth each grant
of stock options made during the fiscal year ended  December 31, 1996 to each of
the Named Executive Officers:


               OPTION GRANTS IN YEAR ENDED DECEMBER 31, 1996




                                                  
                                                                                          
                                                                                          
                                                  INDIVIDUAL GRANTS                                        
                                                 --------------------                    POTENTIAL REALIZABLE 
                                                                                            VALUE AT ASSUMED   
                                 NUMBER OF       PERCENT OF                               ANNUAL RATES OF STOCK  
                                SECURITIES      TOTAL OPTIONS                              PRICE APPRECIATION  
                                UNDERLYING       GRANTED TO      EXERCISE                  FOR OPTION TERM(4)      
                                  OPTIONS       DURING FISCAL     PRICE      EXPIRATION   ---------------------
            NAME               GRANTED(#)(1)      1996(%)(2)    ($/SH)(3)       DATE        5%($)      10%($)
            ----               -------------      ----------    ---------       ----        -----      ------
                                                                                     
Anthony E. Maida, III             28,625            25.8%         $0.23       7/29/03      $2,680      $6,246
Lynn E. Spitler, M.D.             28,625            25.8%         $0.24       7/29/03      $2,797      $6,518


- ----------
(1)  Options were granted under the Company's 1993  Incentive  Stock Option Plan
     and vest  monthly  over  three  years from May 1996,  subject to  continued
     employment with or services to the Company.

(2)  Based on an aggregate of 111,076 options granted by the Company in the year
     ended  December 31, 1996 to employees  of and  consultants  to the Company,
     including the Named Executive Officers.

(3)  The  exercise  price per share of each  option was equal to the fair market
     value of the Common Stock on the date of grant as  determined  by the Board
     of Directors except for the options granted to Lynn E. Spitler,  M.D. which
     were  granted at an exercise  price of 110% of the fair market value on the
     date of grant.

(4)  The  potential  realizable  value  is  calculated  based on the term of the
     option at its time of grant (seven years).  It is calculated  assuming that
     the fair market  value of the  Company's  Common Stock on the date of grant
     appreciates at the indicated annual rate compounded annually for the entire
     term of the option and that the  option is  exercised  and sold on the last
     day of its  term  for  the  appreciated  stock  price.  These  numbers  are
     calculated  based on the  requirements  promulgated  by the  Securities and
     Exchange  Commission  and do not reflect the  Company's  estimate of future
     stock price growth.


                                       41






    Option  Exercises  in Last Fiscal  Year and Fiscal  Year End Option  Values.
There were no stock option  exercises  during the year ended  December 31, 1996.
The  following  table sets forth for each of the Named  Executive  Officers  the
number and value of securities  underlying  unexercised options held at December
31, 1996:

      AGGREGATE OPTION EXERCISES IN YEAR ENDED DECEMBER 31, 1996 AND
                    OPTION VALUES AT DECEMBER 31, 1996




                                 NUMBER OF UNEXERCISED          VALUE OF UNEXERCISED
                                       OPTIONS AT             IN-THE-MONEY OPTIONS AT
                                 DECEMBER 31, 1996(#)         DECEMBER 31, 1996($)(1)
                                 --------------------         ------------------------
          NAME                 EXERCISABLE   UNEXERCISABLE   EXERCISABLE   UNEXERCISABLE
          ----                 -----------   -------------   -----------   -------------
                                                              
Anthony E. Maida, III            69,975        101,779        $509,990      $ 741,523
Lynn E. Spitler, M.D.             6,361         22,264        $ 49,361      $ 161,636




- ----------
(1)  Based on a value of $7.50 per share,  the assumed  initial public  offering
     price,  minus the per share  exercise  price,  multiplied  by the number of
     shares underlying the option.


EMPLOYEE BENEFIT PLANS

    1993 Incentive  Stock Plan.  The Company's  1993  Incentive  Stock Plan (the
"1993 Plan")  provides for the grant of incentive stock options to employees and
nonstatutory  stock options to employees,  directors  and  consultants.  Options
granted under the 1993 Plan typically  vest over three years.  As of January 31,
1997,  options to purchase an aggregate  of 363,800  shares of Common Stock were
outstanding  and 1,950  shares had been  issued  upon  exercise  of  outstanding
options.  Options  granted  under  the 1993  Plan  will  remain  outstanding  in
accordance  with their terms,  but the Board of Directors has determined that no
further options will be granted under the 1993 Plan.

    Non-Plan Stock Options. Prior to adopting the 1993 Plan, the Company granted
options to purchase a total of 28,629 shares of its Common Stock.  As of January
31, 1997, non-plan options to purchase 14,314 shares were outstanding and 14,315
shares had been issued upon exercise of  outstanding  options.  The Company does
not plan to make any future option grants outside of its existing option plans.

    1997 Stock Plan.  The Company's  1997 Stock Plan (the "1997 Plan")  provides
for the grant of  incentive  stock  options  to  employees  (including  employee
directors)  and  nonstatutory   stock  options  and  stock  purchase  rights  to
employees,  directors and consultants. A total of 350,000 shares of Common Stock
have been reserved for issuance  under the 1997 Plan, all of which are currently
available  for  grant.  The 1997  Stock  Plan is  administered  by the  Board of
Directors.  Options and stock  purchase  rights granted under the 1997 Plan will
vest as determined by the Board,  and may  accelerate and become fully vested in
the event of an acquisition of the Company if so determined.  The exercise price
of options  and stock  purchase  rights  granted  under the 1997 Plan will be as
determined by the Board,  although the exercise price of incentive stock options
must be at least equal to the fair market value of the Company's Common Stock on
the date of grant.  The Board of Directors  may amend or modify the 1997 Plan at
any time.  The 1997 Plan will  terminate  in  January  2007,  unless  terminated
earlier by the Board of Directors.

    The Company has agreed that it will not, without the Representative's  prior
written  consent,  for a period  of 12  months  from the  effective  date of the
Registration Statement adopt, propose to adopt, or otherwise permit to exist any
additional equity compensation plans or similar  arrangements  providing for (i)
the grant,  sale,  or issuance of stock  options,  warrants,  or other rights to
acquire the Company's  securities to any of the  Company's  executive  officers,
directors,  employees,  consultants  or holders  of


                                       42





5% or more of the Company's  Common Stock;  (ii) the grant,  sale or issuance of
any option,  warrant or other right to acquire the Company's securities or enter
into any agreement to grant, sell or issue any option, warrant or other right to
acquire the  Company's  securities  at an  exercise  price that is less than the
greater  of the fair  market  value on the date of grant or sale or the  initial
public  offering  price of the shares;  (iii)  allow for the  maximum  number of
shares of Common Stock or other securities of the Company  purchasable  pursuant
to options or warrants issued by the Company, together with the shares of Common
Stock acquired upon exercise of outstanding  options,  to exceed 728,114 shares;
(iv) allow for the payment for such  securities  with any form of  consideration
other than cash;  or (v) allow for the existence of stock  appreciation  rights,
phantom options or similar arrangements.

LIMITATION OF LIABILITY AND INDEMNIFICATION

    The Company's Certificate of Incorporation limits the liability of directors
to the maximum  extent  permitted by Delaware  law.  Delaware law provides  that
directors of a corporation  will not be personally  liable for monetary  damages
for breach of their fiduciary duties as directors,  except liability for (i) any
breach of their duty of loyalty to the  corporation  or its  stockholders,  (ii)
acts or omissions not in good faith or which involve intentional misconduct or a
knowing violation of law, (iii) unlawful payments of dividends or unlawful stock
repurchases  or  redemptions  or (iv) any  transaction  from which the  director
derived an improper  personal  benefit.  Such  limitation of liability  does not
apply to  liabilities  arising  under the federal  securities  laws and does not
affect the  availability  of equitable  remedies  such as  injunctive  relief or
rescission.

    The Company's  Bylaws provide that the Company shall indemnify its directors
and executive  officers and may  indemnify its other  officers and employees and
other agents to the fullest extent  permitted by law. The Company  believes that
indemnification under its Bylaws covers at least negligence and gross negligence
on the part of  indemnified  parties.  The  Company's  Bylaws  also permit it to
secure insurance on behalf of any officer, director, employee or other agent for
any liability arising out of his or her actions in such capacity,  regardless of
whether the Bylaws permit such indemnification.

    The Company has entered into  agreements  to  indemnify  its  directors  and
executive officers, in addition to indemnification provided for in the Company's
Bylaws.  These agreements among other things,  indemnify the Company's directors
and  executive  officers  for  certain  expenses  (including  attorney's  fees),
judgments,  fines and  settlement  amounts  incurred  by any such  person in any
action or  proceeding,  including  any  action  by or the  right of the  Company
arising out of such person's  services as a director or executive officer of the
Company,  any  subsidiary  of the Company or any other  company or enterprise to
which the person  provides  services at the request of the Company.  The Company
believes  that these  provisions  and  agreements  are  necessary to attract and
retain qualified persons as directors and executive officers.

    There is no currently pending litigation or proceeding involving a director,
officer,  employee or other agent of the Company in which  indemnification would
be required or permitted.  The Company is not aware of any threatened litigation
or   proceeding   which   would   provide   the  basis  for  a  claim  for  such
indemnification.






                                       43






                              CERTAIN TRANSACTIONS

    In May 1993, the Company entered into a Series A Preferred Stock and Warrant
Purchase  Agreement with Hayden Leason, a director and principal  stockholder of
the Company.  Pursuant to the  agreement,  the Company  issued 992,056 shares of
Series A Preferred Stock to Mr. Leason at a price of $800,000. In addition,  the
Company issued a warrant to Mr. Leason to purchase additional shares of Series A
Preferred  Stock. Mr. Leason exercised this warrant in January 1994 and acquired
an additional 992,056 shares of Series A Preferred Stock at a price of $800,000.
The shares of Series A Preferred  Stock  issued to Mr.  Leason will convert into
1,145,034 shares of Common Stock upon consummation of this Offering.

    In July  1995,  the  Company  entered  into a Series B  Preferred  Stock and
Warrant  Purchase  Agreement  with Mr. Leason.  Pursuant to the  Agreement,  the
Company  issued  496,028 shares of Series B Preferred  Stock  (convertible  into
286,258 shares of Common Stock upon consummation of this Offering) to Mr. Leason
at a price of $600,000. In addition,  the Company issued a warrant to Mr. Leason
to purchase up to 2,146,931  shares of Common Stock.  Mr.  Leason  exercised the
warrant  as to  715,649  shares in March  1996 at a price of  $50,000  and as to
286,258  shares in May 1996 at a price of $20,000.  In  connection  with the May
exercise,  the Company and Mr.  Leason agreed to terminate the warrant as to the
remaining shares.

    In February 1996, the Company caused TherAtid,  Incorporated ("TherAtid") to
be formed as a  California  corporation.  TherAtid was formed for the purpose of
entering  into the license  agreement  (the  "Novartis  License")  with Novartis
Corporation.  See  "Business -- Licenses."  TherAtid  issued  200,000  shares of
Common  Stock to Mr.  Leason at a price of $200 and  1,000,000  shares of Common
Stock to Isaiah J. Fidler,  D.V.M.,  Ph.D. at a price of $1,000. Dr. Fidler is a
director and  principal  stockholder  of Jenner.  In addition,  TherAtid  issued
1,818,180  shares of Series A  Preferred  Stock to Jenner at a price of $999,999
and a warrant to  purchase  additional  shares of Series A Preferred  Stock.  In
August  1996,  TherAtid  was  merged  with and into  Jenner.  As a result of the
merger,  Jenner  became the  successor  to the Novartis  License,  the shares of
TherAtid Common Stock issued to Mr. Leason were converted into 115,420 shares of
Jenner  Common Stock,  the shares of TherAtid  Common Stock issued to Dr. Fidler
were  converted  into 577,100  shares of Jenner Common Stock,  and the shares of
TherAtid  Series A  Preferred  Stock  and the  warrant  issued  to  Jenner  were
canceled.

    From March through May 1996, the Company borrowed an aggregate of $3 million
from Mr.  Leason.  The loan  bears  simple  interest  at 10% per  annum  and all
principal  and  interest  is due  and  payable  on May 6,  1999.  The  loan  was
originally secured by the TherAtid  securities issued to Jenner.  However,  with
the merger of TherAtid into Jenner, the loan is now unsecured.

    In August 1996, the Company entered into a Consulting  Agreement with Isaiah
J.  Fidler,  D.V.M.,  Ph.D.,  a director of the  Company,  pursuant to which Dr.
Fidler agreed to assist the Company in developing proprietary compounds, ACT and
JT3002 and their  respective  analogs,  in exchange  for an aggregate of $48,000
payable over the term of the agreement. The agreement expires in August 1997.

    In September 1996, the Company entered into a Sponsored  Research  Agreement
with the  University of Texas M.D.  Anderson  Cancer  Center ("M.D.  Anderson").
Under the agreement,  M.D. Anderson will perform certain research related to the
preclinical  development  of JT3002 for the  adjuvant  therapy of cancer and the
abrogation  of  mucositis,  GI toxicity  and  myelosuppression  in exchange  for
funding in the aggregate amount of $425,752.  All inventions made solely by M.D.
Anderson's  personnel or the  Company's  personnel  will be the sole property of
M.D. Anderson or the Company,  respectively,  and all property developed jointly
by  personnel  of M.D.  Anderson  and the Company  will be owned  jointly.  With
respect to the property owned solely by M.D.  Anderson or jointly by the Company
and M.D.  Anderson,  the  Company  has the  option  to  negotiate  the terms and
conditions of a license  agreement with M.D.  Anderson.  If the Company and M.D.
Anderson do not reach  agreement on the terms and  conditions  of such a license
agreement  within 180 days, the Company shall have a right of first refusal with
respect to any third party offers that are more favorable to M.D.  Anderson than
those offered by the Company.  The research performed by M.D. Anderson under the
agreement will be directed by Dr. Fidler.


                                       44





                             PRINCIPAL STOCKHOLDERS

    The following table sets forth certain information  regarding the beneficial
ownership of the Company's  Common Stock as of December 31, 1996 and as adjusted
to reflect the sale by the Company of the Securities offered hereby, by (i) each
director of the Company,  (ii) each Named Executive  Officer,  (iii) each person
known to the Company to be the beneficial owner of more than 5% of the Company's
Common Stock, and (iv) all directors and executive  officers of the Company as a
group.  Except as otherwise  indicated,  based on  information  furnished by the
beneficial  owners of the Common Stock listed below,  the Company  believes that
such owners have sole  investment  and voting power with respect to such shares,
subject to community property laws where applicable.  See "Certain Transactions"
and "Risk Factors -- Concentration of Ownership."


                                                        
                                                          PERCENTAGE OF VOTING 
                                           NUMBER OF    STOCK BENEFICIALLY OWNED
                                            SHARES      ------------------------
                                         BENEFICIALLY      BEFORE        AFTER
       NAME AND ADDRESS                     OWNED         OFFERING     OFFERING
       ----------------                     -----         --------     --------
Lowell M. Dicke(1)                            23,458         1.0%           *
 Diversified Investors Corporation
  82 Wall Street
  New York, NY 10005

Isaiah J. Fidler, D.V.M., Ph.D(2)            584,257        12.6%           8.2%
 Department of Cell Biology -- 173
  MD Anderson Cancer Center
  1515 Holcombe Boulevard
  Houston, TX 77030

Robert A. Fildes, Ph.D.(3)                    23,458         1.0%           *
 905 Pepperwood Drive
  Danville, CA 94506

Jack Bowman(4)                                 9,145         *              *
 3077 Scenic Avenue
  Lummi Island, WA 98262

Anthony E. Maida, III(5)                     258,484         5.5%           3.6%
 2010 Crow Canyon Place, Suite 100
  San Ramon, CA 94853

Herbert Grossman(6)                            9,146         *              *
 35 Highland Drive
  West Caldwell, NJ 07006

Hayden Leason(7)                           2,548,610        55.1%          35.8%
 W4269 Southland Road
  Lake Geneva, WI 53147

Lynn E. Spitler, M.D.(8)                   1,072,829        23.2%          15.1%
 2010 Crow Canyon Place, Suite 100
  San Ramon, CA 94853

All directors and executive officers   
 as a group (8 persons)(9)                 4,529,387        95.9%          62.7%


- ------------
 *  Less than 1%.

(1) Includes 397 shares  issuable upon  exercise of stock  options  exercisable
     within 60 days of December 31, 1996.

                                       45







(2)  Includes 289,017 shares of Common Stock initially  subject to repurchase by
     the  Company.  One  twenty-fourth  of the  shares  were  released  from the
     repurchase  option on April 30, 1996 and an additional one twenty-fourth of
     the shares are  released  at the end of each full month  thereafter,  based
     upon Dr. Fidler's continued relationship to the Company.

(3)  Includes 1,988 shares  issuable upon exercise of stock options  exercisable
     within 60 days of December 31, 1996.

(4)  Consists  of  9,145  shares   issuable   upon  exercise  of  stock  options
     exercisable within 60 days of December 31, 1996.

(5)  Includes an aggregate of 49,747 shares that have been gift  transferred  to
     members of Mr. Maida's family. Mr. Maida disclaims  beneficial ownership of
     all  shares  held by such  transferees  except for  43,282  shares  held in
     custodianship  under the California  Uniform Transfer to Minors Act for the
     benefit of Mr. Maida's minor children. Also includes 79,515 shares issuable
     upon exercise of stock options  exercisable  within 60 days of December 31,
     1996.

(6)  Includes 1,988 shares  issuable upon exercise of stock options  exercisable
     within 60 days of December 31, 1996.

(7)  Includes an aggregate of 288,998 shares that have been gift  transferred to
     friends  and to  members  of Mr.  Leason's  family.  Mr.  Leason  disclaims
     beneficial ownership of all shares held by such transferees.

(8)  Includes an aggregate of 248,335 shares that have been gift  transferred to
     friends  and to members of Dr.  Spitler's  family.  Dr.  Spitler  disclaims
     beneficial ownership of all shares held by such transferees.  Also includes
     7,951 shares issuable upon exercise of stock options  exercisable within 60
     days of December 31, 1996.

(9)  Includes an aggregate of 587,080 shares  previously gift transferred by Mr.
     Maida,  Mr.  Leason and Dr.  Spitler.  See Notes 5, 7 and 8. Also  includes
     100,984 shares issuable upon exercise of stock options  exercisable  within
     60 days of December 31, 1996.


                                       46





                            DESCRIPTION OF SECURITIES

    Upon the  closing of this  Offering,  the  authorized  capital  stock of the
Company will consist of 30,000,000  shares of Common Stock, par value $0.001 per
share, and 5,000,000 shares of Preferred Stock, $0.001 par value (the "Preferred
Stock").  At December  31,  1996,  there were  4,621,886  shares of Common Stock
outstanding held of record by approximately 51 stockholders.

COMMON STOCK

    The holders of Common  Stock are entitled to one vote for each share held of
record on all matters  submitted to a vote of the  stockholders.  Subject to any
outstanding Preferred Stock preference, the holders of Common Stock are entitled
to receive ratably the dividends, if any, that may be declared from time to time
by the Board of Directors out of funds legally available for such dividends. The
Company  has never  declared a dividend  and does not  anticipate  doing so. See
"Dividend Policy." Subject to any outstanding Preferred Stock preference, in the
event of a liquidation, dissolution or winding up of the Company, the holders of
Common Stock are entitled to share ratably in all assets remaining after payment
of liabilities.  Holders of Common Stock have no preemptive  rights and no right
to convert their Common Stock into any other securities. There are no redemption
or sinking fund provisions  applicable to the Common Stock.  All the outstanding
shares of Common  Stock are,  and the shares of Common Stock to be issued in the
Offering will be, validly issued, fully paid and nonassessable.

PREFERRED STOCK

    Effective upon the closing of this Offering,  the Company will be authorized
to issue 5,000,000 shares of undesignated Preferred Stock, none of which will be
outstanding upon the closing of this Offering.  The Board of Directors will have
the  authority,  without  further  action  by the  stockholders,  to  issue  the
undesignated  Preferred  Stock  in one  or  more  series,  to  fix  the  rights,
preferences,  privileges and restrictions  granted to or imposed upon any wholly
unissued shares of undesignated  Preferred Stock and to fix the number of shares
constituting  any series and the  designation  of such  series.  The issuance of
Preferred  Stock may have the effect of  delaying,  deferring  or  preventing  a
change in control of the Company without further action by the stockholders, may
discourage  bids for the  Company's  Common  Stock at a premium  over the market
price of the Common Stock and may  adversely  affect the market price of and the
voting and other rights of the holders of Common Stock. At present,  the Company
has no plans to issue any of the Preferred Stock.

WARRANTS

    The following is a brief summary of certain provisions of the Warrants,  but
such summary does not purport to be  complete.  A copy of the Warrant  Agreement
has  been  filed as an  exhibit  to the  Registration  Statement  of which  this
Prospectus is a part. See "Additional Information."

    Exercise  Price and Terms.  Each  Warrant  entitles  the  registered  holder
thereof to purchase,  at any time over a  forty-eight  month  period  commencing
twelve (12) months after the date of this Prospectus,  one share of Common Stock
at a price of $ per share [140% of the initial public offering price per share],
subject to adjustment in accordance with the  anti-dilution and other provisions
referred  to below.  The holder of any  Warrant  may  exercise  such  Warrant by
surrendering the certificate representing the Warrant to the Warrant Agent, with
the  subscription  form thereon properly  completed and executed,  together with
payment of the  exercise  price.  The  Warrants  may be exercised at any time in
whole  or in part at the  applicable  exercise  price  until  expiration  of the
Warrants. No fractional shares will be issued upon the exercise of the Warrants.

    The exercise  price of the Warrants bears no  relationship  to any objective
criteria  of value and should in no event be regarded  as an  indication  of any
future market price of the Securities offered hereby.

    Adjustments.  The  exercise  price and the number of shares of Common  Stock
purchasable upon the exercise of the Warrants are subject to adjustment upon the
occurrence  of  certain  events,   including  stock  dividends,   stock  splits,
combinations or reclassifications of the Common Stock, or sale by the 

                                       47





Company  of shares of its  Common  Stock or other  securities  convertible  into
Common  Stock  at a  price  below  the  then-applicable  exercise  price  of the
Warrants.   Additionally,  an  adjustment  would  be  made  in  the  case  of  a
reclassification  or exchange of Common  Stock,  consolidation  or merger of the
Company with or into another  corporation  (other than a consolidation or merger
in  which  the  Company  is  the  surviving  corporation)  or  sale  of  all  or
substantially all of the assets of the Company in order to enable warrantholders
to  acquire  the kind and  number  of  shares  of stock or other  securities  or
property  receivable in such event by a holder of the number of shares of Common
Stock that might otherwise have been purchased upon the exercise of the Warrant.

    Redemption  Provisions.  Commencing  eighteen  (18) months after the date of
this Prospectus,  the Warrants are subject to redemption at $0.10 per Warrant on
thirty  (30) days' prior  written  notice to the  warrantholders  if the average
closing bid price of the Common Stock as reported on the American Stock Exchange
equals or exceeds $ per share [160% of the  initial  public  offering  price per
share of Common  Stock]  for any twenty  (20)  trading  days  within a period of
thirty (30)  consecutive  trading days ending on the fifth  trading day prior to
the date of the notice of  redemption.  In the event the Company  exercises  the
right to redeem the Warrants,  such Warrants will be exercisable until the close
of business on the business day  immediately  preceding the date for  redemption
fixed in such notice.  If any Warrant  called for redemption is not exercised by
such  time,  it will  cease  to be  exercisable  and the  warrantholder  will be
entitled only to the redemption price.

    Transfer, Exchange and Exercise. The Warrants are in registered form and may
be presented to the Warrant Agent for transfer, exchange or exercise at any time
on or prior to  their  expiration  date  five  (5)  years  from the date of this
Prospectus,  at which time the Warrants become wholly void and of no value. If a
market for the Warrants  develops,  the holder may sell the Warrants  instead of
exercising  them.  There can be no  assurance,  however,  that a market  for the
Warrants will develop or continue.

    Warrantholder Not a Stockholder. The Warrants do not confer upon holders any
voting, dividend or other rights as stockholders of the Company.

    Modification  of Warrant.  The  Company and the Warrant  Agent may make such
modifications  to the Warrant as they deem  necessary and desirable  that do not
adversely  affect the interests of the  warrantholders.  The Company may, in its
sole  discretion,  lower the exercise  price of the Warrants for a period of not
less than thirty  (30) days on not less than  thirty  (30) days'  prior  written
notice to the warrantholders and the Representative.  Modification of the number
of securities  purchasable upon the exercise of any Warrant,  the exercise price
and the  expiration  date with  respect to any Warrant  requires  the consent of
two-thirds  of the  warrantholders.  No other  modifications  may be made to the
Warrants, without the consent of two-thirds of the warrantholders.

    A  significant  amount  of the  securities  offered  hereby  may be  sold to
customers  of the  Representative.  Such  customers  subsequently  may engage in
transactions  for the sale or  purchase of such  securities  through or with the
Representative.  Although  it has no  obligation  to do so,  the  Representative
currently intends to make a market in the Company's securities and may otherwise
effect  transactions in such securities.  If it participates in the market,  the
Representative may exert a dominating  influence on the market, if one develops,
for the securities described in this Prospectus. Such market-making activity may
be discontinued at any time. The price and liquidity of the Common Stock and the
Warrants  may  be  significantly   affected  by  the  degree,  if  any,  of  the
Representative's participation in such market. See "Underwriting."

    The Warrants are not exercisable  unless,  at the time of the exercise,  the
Company has a current  prospectus  covering the shares of Common Stock  issuable
upon exercise of the Warrants,  and such shares have been registered,  qualified
or deemed to be exempt  under the  securities  laws of the state of residence of
the  exercising  holder of the Warrants.  Although the Company will use its best
efforts to have all the shares of Common  Stock  issuable  upon  exercise of the
Warrants  registered or qualified on or before the exercise date and to maintain
a current  prospectus  relating  thereto  until the  expiration of the Warrants,
there can be no assurance that it will be able to do so.

    The Warrants are separately transferable immediately upon issuance. Although
the  Securities  will not knowingly be sold to purchasers  in  jurisdictions  in
which  the  Securities  are not  registered  or  otherwise  qualified  for sale,
purchasers may buy Warrants in the aftermarket or may move to 

                                       48





jurisdictions in which the shares  underlying the Warrants are not so registered
or qualified during the period that the Warrants are exercisable. In this event,
the  Company  would be  unable  to issue  shares to those  persons  desiring  to
exercise  their  Warrants,  and holders of Warrants  would have no choice but to
attempt to sell the Warrants in a jurisdiction where such sale is permissible or
allow them to expired unexercised.

REGISTRATION RIGHTS OF CERTAIN HOLDERS

    The  holders  of  1,860,680   shares  of  Common  Stock  (the   "Registrable
Securities") or their transferees are entitled to certain rights with respect to
the  registration  of such shares  under the  Securities  Act.  These rights are
provided under the terms of an agreement  between the Company and the holders of
Registrable  Securities.  Subject to certain  limitations in the agreement,  the
holders  of at least  80% of the  Registrable  Securities  may  require,  on one
occasion  beginning  six  months  after  the date of this  Prospectus,  that the
Company use its best efforts to register the  Registrable  Securities for public
resale  (the  "Requested  Registration").  If the Company  registers  any of its
Common  Stock  either for its own account or for the  account of other  security
holders,  the holders of  Registrable  Securities  are entitled to include their
shares  of Common  Stock in the  registration,  subject  to the  ability  of the
underwriters to limit the number of shares included in the offering. Any holders
of the Registrable  Securities may also require the Company to register all or a
portion  of their  Registrable  Securities  on Form  S-3  when use of such  form
becomes available to the Company,  provided,  among other limitations,  that the
proposed  aggregate  selling  price  of such  shares  (net of any  underwriters'
discounts or commissions) is at least $1 million. All registration  expenses for
the  Requested  Registration  must  be  borne  by  the  Company  and  all  other
registration  expenses and selling expenses  relating to Registrable  Securities
must be borne by the holders of the securities being registered.

DELAWARE ANTI-TAKEOVER LAW AND CERTAIN CHARTER AND BYLAW PROVISIONS

    Jenner is a  Delaware  corporation  and is  subject  to  Section  203 of the
Delaware General Corporation Law, an anti-takeover law. In general,  Section 203
prohibits a publicly  held  Delaware  corporation  from  engaging in a "business
combination" with an "interested  stockholder" for a period of three years after
the date the  person  became an  interested  stockholder  unless  (with  certain
exceptions)  the "business  combination"  or the transaction in which the person
became an interested stockholder is approved in a prescribed manner.  Generally,
a  "business  combination"  includes  a merger,  asset or stock  sale,  or other
transaction resulting in a financial benefit to the stockholder.  Generally,  an
"interested   stockholder"  is  a  person  who,  together  with  affiliates  and
associates,  owns (or  within  three  years  prior,  did own) 15% or more of the
corporation's voting stock. The existence of this provision would be expected to
have an  anti-takeover  effect  with  respect to  transactions  not  approved in
advance by the Board of Directors,  including  discouraging  attempts that might
result in premium  over the market  price for the shares of Common Stock held by
the stockholders.

    The  Company's  Certificate  of  Incorporation  provides  that the  Board of
Directors may issue shares of Preferred  Stock without  stockholder  approval on
such  terms as the  Board  may  determine.  The  authorization  of  undesignated
Preferred  Stock makes it possible for the Board of Directors to issue Preferred
Stock with voting or other rights or  preferences  that could impede the success
of any attempt to change  control of the  Company.  In addition,  the  Company's
Certificate  of  Incorporation  and Bylaws  eliminate  cumulative  voting in the
election of directors,  and provide that stockholder action can be taken only at
an annual or  special  meeting of  stockholders  and may not be taken by written
consent.  The Bylaws provide that special meetings of stockholders can be called
only by the Board of  Directors,  the  Chairman  of the  Board,  if any,  or the
President  of the  Company.  These and other  provisions  may have the effect of
deferring  hostile takeovers or delaying changes in control or management of the
Company.  The  affirmative  vote of the  holders of at least  two-thirds  of the
voting stock of the Company is required to amend the foregoing provisions of the
Certificate of Incorporation and Bylaws.

TRANSFER AGENT AND REGISTRAR AND WARRANT AGENT

    The name and address of the Transfer  Agent and  Registrar for the Company's
Common  Stock  and the  Warrant  Agent for the  Warrants  is  Continental  Stock
Transfer and Trust Company, 2 Broadway, New York, New York 10004.


                                       49





                         SHARES ELIGIBLE FOR FUTURE SALE

    Upon the completion of this Offering, the Company will have 7,121,886 shares
of Common  Stock  outstanding  (not  including  378,114  shares of Common  Stock
subject to outstanding  options),  assuming no exercise of options after January
31, 1997 and outstanding  warrants to purchase an additional 2,500,000 shares of
Common  Stock  assuming no exercise of the  Representative's  Warrant.  Of these
securities,  2,500,000  shares of  Common  Stock and the  Warrants  to  purchase
2,500,000  shares of Common Stock sold in this Offering will be freely tradeable
without  restriction under the Securities Act. The remaining 4,621,886 shares of
Common Stock held by existing  stockholders  were issued and sold by the Company
in reliance on exemptions from the  registration  requirements of the Securities
Act.  These  shares  may be sold in the public  market  only if  registered,  or
pursuant to an exemption from registration such as Rule 144, 144(k) or 701 under
the  Securities  Act. Such  restricted  shares will be available for sale in the
public  market 12 months after the date of this  Prospectus  upon  expiration of
lock-up agreements with the Representative as follows: (i) 2,927,449 shares (not
including  approximately  228,403 shares subject to outstanding  vested options)
will  be  available  for  immediate  sale,  subject  in  some  cases  to  volume
limitations pursuant to Rule 144 and (ii) the remaining 1,694,437 shares will be
eligible for sale at various times over a period of less than two years, subject
in some cases to vesting provisions and volume limitations.  In addition, twelve
(12) months after the  completion  of this  Offering,  250,000  shares of Common
Stock issuable upon exercise of the  Representative's  Warrants and the Warrants
to  purchase  250,000  shares of Common  Stock  issuable  upon  exercise  of the
Representative's  Warrants will be available for sale. The Company's  directors,
executive  officers  and  stockholders,  who in the  aggregate  hold 100% of the
shares of  Common  Stock of the  Company  outstanding  immediately  prior to the
completion  of this  Offering,  have entered into  lock-up  agreements  with the
Representative  under  which they have  agreed not to offer,  sell,  contract to
sell, grant any option to purchase or otherwise  dispose of, or agree to dispose
of,  directly or  indirectly,  any shares of Common  Stock or options to acquire
shares of Common Stock owned by them for a period of 12 months after the date of
this Prospectus,  without the prior written consent of the  Representative.  The
Representative  may, in its sole  discretion,  and at any time  without  notice,
release all or any portion of the shares subject to such lock-up agreements. The
Company has entered into a similar agreement,  except that the Company may grant
options and issue stock under its current stock option and stock  purchase plans
and issue stock pursuant to outstanding vested options.

    As of January 31, 1997, 378,114 shares were subject to outstanding  options.
All  of  these   shares  are  subject  to  the  lock-up   agreements   with  the
Representative described above. In addition, 1,860,680 of the shares outstanding
immediately  following  the  completion  of this  Offering  will be  entitled to
registration  rights  with  respect to such  shares  upon the release of lock-up
agreements.  The number of shares sold in the public  market  could  increase if
such rights are exercised.

    In  general,  under Rule 144 as  currently  in effect,  a person (or persons
whose shares are aggregated), including an affiliate, who has beneficially owned
shares for at least two (2) years  (including the  contiguous  holding period of
any  prior  owner  except  an  affiliate)  is  entitled  to  sell  in  "broker's
transactions" or to market makers,  within any three-month  period commencing at
least  ninety  (90) days after the date of this  Prospectus,  a number of shares
that does not exceed  the  greater  of (i) one  percent of the then  outstanding
shares of Common  Stock  (approximately  105,087  shares  immediately  after the
Offering) or (ii) the average  weekly  trading volume in the Common Stock during
the four calendar weeks  preceding the filing of a Form 144 with respect to such
sale. Sales under Rule 144 are also subject to certain requirements as to manner
of sale,  the  filing of a notice  and the  availability  of public  information
concerning the Company. In addition,  a person who is not deemed to have been an
affiliate  of the  Company at any time  during the three (3) months  preceding a
sale and who has beneficially  owned the shares proposed to be sold for at least
three (3) years  (including  the  contiguous  holding  period of any prior owner
except an  affiliate)  would be entitled  to sell such shares  under Rule 144(k)
without regard to the requirements described above.

    Any  employee,  officer or  director  of or  consultant  to the  Company who
purchased his or her shares pursuant to a written  compensatory plan or contract
is entitled to rely on the resale  provisions  of Rule 701 under the  Securities
Act, which permits nonaffiliates to sell their Rule 701 shares without having to

                                       50





comply with the public information,  holding period, volume limitation or notice
provisions  of Rule 144 and  permits  affiliates  to sell  their Rule 701 shares
without  having to comply with Rule 144's holding period  restrictions,  in each
case commencing ninety (90) days after the date of this Prospectus; however, all
persons  who hold  shares of the  Company  that  would be  eligible  for  resale
pursuant to Rule 701 have entered into agreements  with the Company  pursuant to
which they have  agreed not to sell any such  shares for a period of twelve (12)
months  from the date of this  Prospectus  (the  "Lock-up  Period")  without the
Representative's consent. See "Underwriting."

    Prior to the Offering,  there has been no market for the Common Stock or the
Warrants of the Company,  and no predictions can be made of the effect,  if any,
that market sales of shares or the  availability of shares for sale will have on
the  market  price  prevailing  from  time  to  time.  Nevertheless,   sales  of
substantial  amounts of the Common  Stock and the Warrants of the Company in the
public market could  adversely  affect  prevailing  market prices for the Common
Stock and the Warrants and the ability of the Company to raise equity capital in
the future.









                                       51







                               UNDERWRITING

    The  Underwriters  named  below  (the   "Underwriters")  for  whom  National
Securities  Corporation  is  acting as  representative  (in such  capacity,  the
"Representative"), have severally agreed, subject to the terms and conditions of
the Underwriting Agreement (the "Underwriting Agreement"),  to purchase from the
Company,  and the  Company  has  agreed  to sell to the  Underwriters  on a firm
commitment  basis, the respective  number of shares of Common Stock and Warrants
set forth opposite their names.

    
                                              NUMBER OF                   
                                              SHARES OF
                                               COMMON        NUMBER OF
           UNDERWRITER                          STOCK         WARRANTS
           -----------                          -----         --------
    National Securities Corporation
    
    
    
    
                                              ---------      ---------
      Total                                   2,500,000      2,500,000
                                              =========      =========
    

    The  Underwriters  are  committed to purchase all the shares of Common Stock
and Warrants  offered  hereby,  if any of such  Securities  are  purchased.  The
Underwriting Agreement provides that the obligations of the several Underwriters
are subject to conditions precedent specified therein.

    The Company has been  advised by the  Representative  that the  Underwriters
propose  initially to offer the  Securities to the public at the initial  public
offering  prices set forth on the cover page of this  Prospectus  and to certain
dealers at such prices less concessions of not in excess of $_____ per Share and
$_______  per Warrant.  Such  dealers may reallow a concession  not in excess of
$_______ per Share and $______ per Warrant to certain other  dealers.  After the
commencement  of  the  Offering,  the  public  offering  price,  concession  and
reallowance may be changed by the Representative.

    The Representative has informed the Company that it does not expect sales to
discretionary  accounts  by the  Underwriters  to  exceed  five  percent  of the
Securities offered hereby.

    The  Company  has  agreed to  indemnify  the  Underwriters  against  certain
liabilities, including liabilities under the Securities Act, or to contribute to
payments  that the  Underwriters  may be required to make.  The Company has also
agreed  to pay to the  Representative  a  nonaccountable  expense  allowance  of
$500,000, of which $50,000 has been paid to date.

    The  Company  has  granted  to the  Underwriters  an  Over-Allotment  Option
exercisable  during  the  forty-five  (45)  day  period  from  the  date of this
Prospectus,  to  purchase up to an  additional  375,000  Shares of Common  Stock
and/or 375,000  additional  Warrants at the public  offering price per Share and
Warrant,  respectively,   offered  hereby,  less  underwriting  discounts.  Such
Over-Allotment  Option  may be  exercised  only  for  the  purpose  of  covering
over-allotments,  if any, incurred in the sale of the Securities offered hereby.
To the extent such Over-Allotment  Option is exercised in whole or in part, each
Underwriter  will have a firm  commitment,  subject  to certain  conditions,  to
purchase the number of the additional  Securities  proportionate  to its initial
commitment.

    In  connection  with the  Offering  the  Company  has  agreed to sell to the
Representative, for nominal consideration, warrants to purchase from the Company
up  to  250,000   Shares  of  Common  Stock   and/or   250,000   Warrants   (the
"Representative's   Warrants").  The  Representative's  Warrants  are  initially
exercisable  at a price  of  $_______  per  Share  [140% of the  initial  public
offering  price per Share] and $_______ per Warrant [140% of the initial  public
offering  price per  Warrant]  for a period  of four  years, 

                                       52





commencing  at the  beginning of the second year after their  issuance and sale.
The Representative's Warrants provide for adjustment in the numbers of shares of
Common Stock and  Warrants  issuable  upon the  exercise  thereof as a result of
certain subdivisions or combinations of the Common Stock.

    The Company's directors and executive officers, and all holders of shares of
Common Stock, options, warrants or other securities exercisable,  convertible or
exchangeable  for shares of Common  Stock,  have  agreed  not to offer,  sell or
otherwise  dispose  of any  shares of Common  Stock for a period of twelve  (12)
months following the effective date of this Prospectus without the prior written
consent of the Representative. An appropriate legend shall be marked on the face
of certificates representing all such securities.

    Upon the exercise of any Warrants  more than one year after the date of this
Prospectus,  which  exercise  was  solicited by the  Representative,  and to the
extent not  inconsistent  with the  guidelines  of the National  Association  of
Securities Dealers,  Inc., and the Rules and Regulations of the Commission,  the
Company has agreed to pay the Representative a commission which shall not exceed
five percent (5%) of the aggregate exercise price of such Warrants in connection
with bona fide services provided by the  Representative  relating to any warrant
solicitation undertaken by the Representative.  In addition, the individual must
designate  the firm  entitled  to payment of such  warrant  solicitation  fee. A
warrant solicitation fee will only be paid to the Representative or another NASD
member  when such NASD  member is  specifically  designated  in  writing  as the
soliciting broker.  However,  no compensation will be paid to the Representative
in  connection  with the exercise of the Warrants if (a) the market price of the
Common Stock is lower than the exercise  price,  (b) the Warrants were held in a
discretionary  account,  or (c) the exercise of Warrants is not solicited by the
Representative.  Unless  granted an  exemption by the  Commission  from its Rule
10b-6  under the  Exchange  Act,  the  Representative  will be  prohibited  from
engaging in any market-making activities with regard to the Company's securities
for the period from nine (9) business days (or other such applicable  periods as
Rule  10b-6  may  provide)  prior to any  solicitation  of the  exercise  of the
Warrants until the later of the termination of such solicitation activity or the
termination (by waiver or otherwise) of any right the representative may have to
receive a fee.  As a result,  the  Representative  may be unable to  continue to
provide a market for the Common Stock or Warrants  during certain  periods while
the Warrants are exercisable.  If the  Representative  has engaged in any of the
activities  prohibited  by Rule 10b-6 during the periods  described  above,  the
Representative  undertakes  to waive  unconditionally  its  rights to  receive a
commission on the exercise of such Warrants.

    The Company has agreed, at the request of the Representative, that for three
years after the date of this  Prospectus,  it will use its best efforts to cause
one individual  designated by the  Representative to be elected to the Company's
Board of Directors.

    Prior to the Offering,  there has been no public market for the Common Stock
or  the  Warrants.  Consequently,  the  initial  public  offering  price  of the
Securities  has been  determined  by  negotiation  between  the  Company and the
Representative  and does not necessarily  bear any relationship to the Company's
asset  value,  net  worth,  and other  established  criteria  of value.  Factors
considered in such  negotiations,  in addition to prevailing market  conditions,
include  the  history of and  prospects  for the  industry  in which the Company
competes,  an  assessment  of the  Company's  management,  the  prospects of the
Company,  its  capital  structure  and  certain  other  factors  as were  deemed
relevant.

    The  foregoing  is a  summary  of the  principal  terms  of  the  agreements
described above and does not purport to be complete. Reference is made to a copy
of each  such  agreement,  which  is  filed as an  exhibit  to the  Registration
Statement. See "Additional Information."




                                       53






                                  LEGAL MATTERS

    The validity of the issuance of the Securities offered hereby will be passed
upon for the  Company  by Wilson  Sonsini  Goodrich & Rosati,  P.C.,  Palo Alto,
California.  Orrick,  Herrington & Sutcliffe, LLP, New York, New York, has acted
as  counsel to the  Underwriters  in  connection  with this  Offering.  Mario M.
Rosati, a partner of Wilson,  Sonsini,  Goodrich & Rosati, P.C., is Secretary of
the Company. As of December 31, 1996 a certain investment  partnership of Wilson
Sonsini Goodrich & Rosati, P.C.  beneficially owned an aggregate of 6,442 shares
of the  Company's  Common  Stock and  Mario M.  Rosati  owned 717  shares of the
Company's Common Stock.

                                     EXPERTS

    The  financial  statements of Jenner  Technologies,  Inc. as of December 31,
1995 and 1996 and for each of the three years in the period  ended  December 31,
1996 and for the period from  inception  (December 8, 1992) to December 31, 1996
appearing in this  Prospectus  and  Registration  Statement have been audited by
Ernst & Young LLP,  independent  auditors,  as set forth in their report thereon
appearing  elsewhere herein with respect  thereto,  and are included in reliance
upon such report given upon the  authority of such firm as experts in accounting
and auditing.

                             ADDITIONAL INFORMATION

    The Company  has filed with the  Securities  and  Exchange  Commission  (the
"Commission")  Washington,  D.C.  20549, a  Registration  Statement on Form S-1,
including  amendments  thereto,  under the  Securities  Act, with respect to the
Securities  offered  hereby.  This  Prospectus  does  not  contain  all  of  the
information  set  forth  in the  Registration  Statement  and the  exhibits  and
schedules filed therewith.  For further  information with respect to the Company
and the  Securities  offered  hereby,  reference  is  made to such  Registration
Statement  and  to  the  exhibits  and  schedules  filed  therewith.  Statements
contained  in this  Prospectus  regarding  the contents of any contract or other
document  referred  to are not  necessarily  complete  and,  in  each  instance,
reference  is made to the copy of such  contract or other  document  filed as an
exhibit to the  Registration  Statement,  each such statement being qualified in
all  respects by such  reference.  The  Registration  Statement,  including  the
exhibits and schedules thereto, may be inspected without charge at the principal
office of the Commission,  450 Fifth Street, N.W.,  Washington,  D.C. 20549, and
copies of all or any part  thereof  may be  obtained  from such  office upon the
payment of prescribed fees. Such information is also available electronically by
means of the Commission's web site on the Internet at http:/www.sec.gov.








                                       54






                          INDEX TO FINANCIAL STATEMENTS

                            JENNER TECHNOLOGIES, INC.

                          (A DEVELOPMENT STAGE COMPANY)




                                                                            PAGE
                                                                            ----
 Report of Ernst & Young LLP, Independent Auditors                           F-2

 Balance Sheets as of December 31, 1994, 1995, and 1996                      F-3

 Statements of Operations for the years ended December 31, 1994,
   1995 and 1996 and for the period from Inception  (December 8,
   1992) to December 31, 1996                                                F-4

 Statement of Stockholders' Equity (Net Capital Deficiency)
  for the period from Inception (December 8, 1992) to December 31, 1996      F-5

 Statements of Cash Flows for the years ended December 31, 1994, 1995
  and 1996, and for the period from Inception (December 8, 1992) to
  December 31, 1996                                                          F-7

 Notes to Financial Statements December 31, 1996                             F-8







                                      F-1







               REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

The Board of Directors and Shareholders
 Jenner Technologies, Inc.

    We have audited the accompanying balance sheets of Jenner Technologies, Inc.
(a  development  stage  company) at December 31, 1995 and 1996,  and the related
statements of operations,  stockholders'  equity (net capital  deficiency),  and
cash flows for each of the three years in the period ended December 31, 1996 and
for the period from  inception  (December 8, 1992) to December  31, 1996.  These
financial  statements are the  responsibility of the Company's  management.  Our
responsibility  is to express an opinion on these financial  statements based on
our audits.

    We conducted  our audits in  accordance  with  generally  accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

    In our opinion,  the financial  statements referred to above present fairly,
in all material respects, the financial position of Jenner Technologies, Inc. (a
development stage company) at December 31, 1995 and 1996, and the results of its
operations  and its cash flows for each of the three  years ended  December  31,
1996 and for the period from inception  (December 8, 1992) to December 31, 1996,
in conformity with generally accepted accounting principles.


                                         ERNST & YOUNG LLP




Palo Alto, California
January 14, 1997, except as for Note 7,
 as to which the date is
 March   , 1997

- ------------

The foregoing  report is in the form that will be signed upon the  completion of
the restatement of the capital  accounts as described in Note 7 to the financial
statements.

Palo Alto, California
February 18, 1997







                                      F-2






                           JENNER TECHNOLOGIES, INC.
                       (A Development Stage Company)

                              BALANCE SHEETS






                                                                                  
                                                                                                                    UNAUDITED
                                                                                                                    PRO FORMA
                                                                                                                  STOCKHOLDERS'
                                                                                                               EQUITY (NET CAPITAL
                                                                                         DECEMBER 31,           DEFICIENCY) AT
                                                                                   ------------------------       DECEMBER 31,
                                                                                      1995          1996              1996
                                                                                   -----------   ----------    --------------------
                                                                                                                    (NOTE 7)
                                                                                                          
                                     ASSETS                                       
Current assets:                                                                   
   Cash and cash equivalents                                                       $   317,635   $ 1,428,510
   Deferred offering costs                                                                  --       102,514
                                                                                   -----------   -----------
Total current assets                                                                   317,635     1,531,024
Equipment                                                                               18,504        35,637
Less accumulated depreciation                                                           (9,393)      (16,153)
                                                                                   -----------   -----------
                                                                                         9,111        19,484
Other assets                                                                             9,625        12,884
                                                                                   -----------   -----------
                                                                                   $   336,371   $ 1,563,392
                                                                                   ===========   ===========
                                                                                  
                               LIABILITIES AND STOCKHOLDERS' EQUITY (NET CAPITAL DEFICIENCY)

Current liabilities:
   Accounts payable                                                                $     14,562  $    72,351                       
   Accrued offering costs                                                                   --        44,000
   Accrued liabilities                                                                      --        97,226
   Notes payable to related party                                                       42,124            --
   Accrued interest                                                                      6,410            --
                                                                                   -----------   -----------
Total current liabilities                                                               63,096       213,577
Long-term note payable to related party                                                     --     3,000,000
Accrued interest due to related party                                                       --       201,985
Commitments                                                                       
Stockholders' equity (net capital deficiency):                                    
  Preferred stock, $0.001 par value, 5,000,000 shares authorized; issuable        
    in series (none issued and outstanding pro forma):                            
      Series A convertible, 2,137,500 shares designated, 2,120,522  shares        
       issued and outstanding in 1995 and 1996 (liquidation preference of         
       $2,035,000 at December 31, 1996)                                              1,710,400     1,710,400       $        --
      Series B convertible, 500,000 shares designated, 496,028 shares issued      
        and outstanding in 1995 and 1996 (liquidation preference of $645,000      
        at December 31, 1996)                                                          600,000       600,000                --
   Common stock, $0.001 par value, 30,000,000 shares authorized, 1,411,424        
     and 3,111,871 shares issued and outstanding in 1995 and 1996,                
     respectively (4,621,886 shares issued and outstanding pro forma)                   11,766       619,156             4,622
   Additional paid-in capital                                                              --             --         2,924,934
   Deferred compensation                                                                   --        (45,000)          (45,000)
   Deficit accumulated during the development stage                                (2,048,891)    (4,736,726)       (4,736,726)
                                                                                   ----------     ----------        ---------- 
Total stockholders' equity (net capital deficiency)                                   273,275     (1,852,170)      $(1,852,170)
                                                                                   ----------     ----------        ========== 
                                                                                  $   336,371    $ 1,563,392
                                                                                  ===========    ===========



                          See accompanying notes.

                                      F-3






                           JENNER TECHNOLOGIES, INC.
                          (A Development Stage Company)

                             STATEMENT OF OPERATIONS






                                                       
                                                                                        PERIOD FROM
                                                                                         INCEPTION
                                                                                       (DECEMBER 8,
                                                      YEAR ENDED DECEMBER 31,            1992) TO
                                                 -----------------------------------    DECEMBER 31,
                                                   1994        1995          1996          1996
                                                 ---------   ---------   -----------   -------------
                                                                            
Operating expenses:
   Research and development                      $ 499,366   $ 698,303   $ 2,206,900    $ 3,743,195
   General and administrative                      228,114     195,663       339,948        901,050
                                                 ---------   ---------   -----------    -----------
                                                   727,480     893,966     2,546,848      4,644,245
                                                 ---------   ---------   -----------    -----------
Loss from operations                              (727,480)   (893,966)   (2,546,848)    (4,644,245)
Interest (expense) income                           22,369      17,100      (140,987)       (92,481)
                                                 ---------   ---------   -----------    ----------- 
Net loss                                         $(705,111)  $(876,866)  $(2,687,835)   $(4,736,726)
                                                 =========   =========   ===========    =========== 
Pro forma net loss per share                                             $     (0.56)
                                                                         =========== 
Shares used in calculation of pro forma
 net loss per share                                                         4,785,863
                                                                         ============


                          See accompanying notes.

                                      F-4





                            JENNER TECHNOLOGIES, INC.
                          (A Development Stage Company)

           STATEMENT OF STOCKHOLDERS' EQUITY (NET CAPITAL DEFICIENCY)
          Period from Inception (December 8, 1992) to December 31, 1996









                                        
                                    PREFERRED STOCK                                                                    
                          --------------------------------------                                           DEFICIT         TOTAL   
                              SERIES A              SERIES B                                            ACCUMULATED    STOCKHOLDERS'
                             CONVERTIBLE           CONVERTIBLE        COMMON STOCK                      DURING THE     EQUITY (NET 
                          -----------------     ----------------    -----------------      DEFFERRED    DEVELOPEMENT      CAPITAL  
                          SHARES     AMOUNT     SHARES    AMOUNT    SHARES     AMOUNT    COMPENSATION      STAGE        DEFICIENCY)
                          ------     ------     ------    ------    ------     ------    ------------      -----        ----------- 
                                                                                                                       
                                                                                            

Issuance   of   common
  stock at $0.007  per
  share to founders in
  exchange   for  cash
  and   technology  in
  December   1992  and
  June 1993                --     $       --     --    $  --       1,334,718   $ 2,360      $   --        $     --     $    2,360  
                                                                                                                                   
Issuance   of   common                                                                                                            
  stock at  $0.14  per                                                                                                           
  share  in   exchange       
  for  technology  and                                                                                                             
  services   in  April                                                                                                            
  through October 1993     --             --     --       --          45,706     6,387          --              --          6,387  
                                                                                                               
                           
Issuance   of   common                                                                                                           
  stock at $0.007  per                                                                                                            
  share upon  exercise                                                                                                            
  of stock  options in                                                                                                            
  May 1993                 --            --      --       --           3,877        27          --              --             27 
                                                                                                              
                                                                                                                                  
Issuance  of  Series A                                                                                                            
  convertible             
  preferred  stock  at    
  $0.8064   per  share    
  and  a  warrant   to    
  purchase     992,056    
  shares  of  Series A    
  convertible             
  preferred  stock  at    
  an exercise price of    
  $0.8064  for cash in    
  May   through   July    
  1993                  1,128,466    910,400     --       --               --       --           --             --         910,400 
                                                                                                                                  
Net  loss  for  period                                                                                                            
  from       inception    
  (December  8,  1992)   
  to December 31, 1993         --        --      --       --               --        --          --          (466,914)    (466,914)
                        ---------    -------   -----   ------       ---------     -----                     --------      ------- 
                                                                                                                  
                                                                                                                                   
Balances  at  December                                                                                                            
  31, 1993              1,128,466    910,400     --        --        1,384,301     8,774          --         (466,914)     452,260
                                                                                                                                 

Issuance  of  Series A                                                                                                            
  convertible                                                                                                                     
  preferred  stock for     
  cash at $0.8064  per                                                                                                            
  share   in   January                                                                                                            
  1994  upon  exercise                                                                                                            
  of warrant              992,056    800,000     --        --               --       --            --              --      800,000

                           
Issuance   of   common                                                                                                            
  stock to consultants   
  at $0.14  per  share    
  in   exchange    for
  services  in January
  1994                        --         --      --        --           20,756    2,900            --               --       2,900 


Issuance   of   common
  stock   at   $0.007-
  $0.14 per share upon
  exercise   of  stock
  options    in    May
  through October 1994        --         --      --        --            1,651      59             --               --          59  


Net loss                      --         --      --        --               --      --             --         (705,111)   (705,111)
                        ---------    -------   -----    ------       ---------     -----                     --------      ------- 
          

Balances  at  December
  31,  1994   (carried
  forward)              2,120,522  $1,710,400    --     $  --        1,406,708  $11,733        $   --      $(1,172,025)   $550,108




                               See accompanying notes.

                                       F-5




                            JENNER TECHNOLOGIES, INC.
                          (A Development Stage Company)

    STATEMENT OF STOCKHOLDERS' EQUITY (NET CAPITAL DEFICIENCY) -- (Continued)
          Period from Inception (December 8, 1992) to December 31, 1996








                                        
                                    PREFERRED STOCK                                                                    
                          --------------------------------------                                           DEFICIT         TOTAL   
                              SERIES A              SERIES B                                            ACCUMULATED    STOCKHOLDERS'
                             CONVERTIBLE           CONVERTIBLE        COMMON STOCK                      DURING THE     EQUITY (NET 
                          -----------------     ----------------    -----------------      DEFFERRED    DEVELOPEMENT      CAPITAL  
                          SHARES     AMOUNT     SHARES    AMOUNT    SHARES     AMOUNT    COMPENSATION      STAGE        DEFICIENCY)
                          ------     ------     ------    ------    ------     ------    ------------      -----        -----------
                                                                                                                       
                                                                                            

Balances  at  December    
  31,  1994   (brought                                                                                                             
  forward)              2,120,522  $1,710,400       --  $     --    1,406,708  $ 11,733   $     --     $(1,172,025)   $   550,108  
                                                                                                                   
                                                                                                                                   
Issuance  of  Series B                                                                                                             
  convertible                                                                                                                      
  preferred  stock  at                                                                                                             
  $1.21  per share and                                                                                                             
  a     warrant     to                                                                                                             
  purchase   2,146,931                                                                                                             
  shares   of   common   
  stock at an exercise                                                                                                             
  price of  $0.04  per                                                                                                             
  share  for  cash  in                                                                                                             
  July 1995                   --           --  496,028   600,000          --        --          --              --        600,000  
                                                                                                                    
                         
Issuance   of   common                                                                                                             
  stock upon  exercise    
  of stock options for                                                                                                             
  cash at  $0.007  per   
  share   in   January                                                                                                             
  through April 1995          --           --       --        --       4,716        33          --              --             33  
                                                                                                                 
                                                                                                                                   
Net loss                      --           --       --        --          --        --          --        (876,866)      (876,866) 
                        ---------   ---------- -------   -------   ---------    -------      -----       ----------      -------- 
                           
Balances  at  December                                                                                                             
  31, 1995              2,120,522    1,710,400 496,028   600,000   1,411,424    11,766          --      (2,048,891)       273,275  
                                                                                                                
                                                                                                                                   
Issuance   of   common                                                                                                             
  stock upon  exercise                                                                                                             
  of stock options for  
  cash at $0.007-$0.23                                                                                                             
  per share in 1996          --           --        --        --       6,020      390           --              --            390  
                                                                                                              
                                                                                                                                   
Issuance   of   common                                                                                                             
  stock upon  exercise                                                                                                             
  of a  warrant  at an                                                                                                             
  exercise   price  of    
  $0.07  per share for                                                                                                             
  cash  in  March  and                                                                                                             
  May 1996                   --           --        --        --   1,001,907   70,000           --              --         70,000  

                                                                                                                                   
Issuance   of   common                                                                                                             
  stock at  $0.70  per      
  share  in   exchange                                                                                                             
  for     shares    in   
  TherAtid  in  August                                                                                                             
  1996  (see  Note 2),  
  including    115,420                                                                                                             
  shares  to a related   
  party                      --           --        --        --     692,520  485,000           --              --        485,000  


Deferred  compensation
  related   to   stock
  option grants              --           --        --        --          --   52,000      (52,000)             --             --  


Amortization    of
  deferred
  compensation               --           --        --        --          --       --        7,000              --          7,000  


Net loss                     --           --        --        --          --       --           --      (2,687,835)    (2,687,835) 
                        ---------   ---------- -------   -------   ---------    -------      -----       ----------      ---------
       
Balances  at  December
  31, 1996              2,120,522  $1,710,400  496,028  $600,000  3,111,871  $619,156     $(45,000)    $(4,736,726)   $(1,852,170) 
                        =========  ==========  =======  ========  =========  ========     ========     ===========    ===========  



                             See accompanying notes.

                                      F-6




                            JENNER TECHNOLOGIES, INC.
                          (A Development Stage Company)

                            STATEMENTS OF CASH FLOWS






                                                                        
                                                                                                         PERIOD FROM
                                                                                                          INCEPTION
                                                                                                        (DECEMBER 8,
                                                                   YEAR ENDED DECEMBER 31,                1992) TO
                                                                 ---------------------------------       DECEMBER 31,
                                                                    1994        1995          1996          1996
                                                                    ----        ----          ----          ----
                                                                                             
Cash flows from operating activities:
Net loss                                                          $(705,111)  $(876,866)  $(2,687,835)   $(4,736,726)
Adjustments to reconcile net loss to net cash used
 in operating activities:
   Depreciation and amortization                                      5,414       4,110        14,160         23,553
   Common stock issued for technology                                 2,900          --       485,000        494,287
   Changes in operating assets and liabilities:
       Prepaid offering costs                                            --          --      (102,514)      (102,514)
       Other assets                                                    (750)     (8,744)       (3,659)       (13,284)
       Accounts payable                                              (4,662)      8,314        57,789         72,351
       Accrued offering costs                                            --          --        44,000         44,000
       Accrued liabilities                                               --          --        97,226         97,226
       Accrued interest                                               3,882       2,528       195,575        201,985
                                                                   --------    --------    ----------     ----------
          Cash flows used in operating activities                  (698,327)   (870,658)   (1,900,258)    (3,919,122)
                                                                   --------    --------    ----------     ---------- 
Cash from investing activities:
   Additions to property and equipment                               (5,490)     (1,808)      (17,133)       (35,637)
Cash flows from financing activities:
   Cash proceeds from issuance of preferred stock                   800,000     600,000            --      2,310,400
   Proceeds from issuance of notes payable                               --          --     3,000,000      3,063,249
   Repayment of notes payable                                            --          --       (42,124)       (63,249)
   Proceeds from issuance of common stock                                59          33        70,390         72,869
                                                                   --------    --------     ---------      ---------
          Cash flows provided by financing activities               800,059     600,033     3,028,266      5,383,269
                                                                    -------     -------     ---------      ---------
Net increase (decrease) in cash                                      96,242    (272,433)    1,110,875      1,428,510
Cash and cash equivalents at the beginning of the period            493,826     590,068       317,635             --
                                                                    -------     -------       -------     ----------           
Cash and cash equivalents at the end of the period                $ 590,068   $ 317,635   $ 1,428,510     $1,428,510
                                                                  =========   =========   ===========     ==========


                          See accompanying notes.

                                      F-7




                           JENNER TECHNOLOGIES, INC.
                          (A Development Stage Company)

                          NOTES TO FINANCIAL STATEMENTS

                               DECEMBER 31, 1996

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

 ORGANIZATION, BUSINESS AND BASIS OF PRESENTATION

    Jenner  Technologies,  Inc. (the "Company") was incorporated in the State of
California  on  December  8, 1992 (see Note 7). The  Company  was  organized  to
develop  immunotherapies to treat patients with cancer. Research and development
of the  Company's  products  is  primarily  conducted  by  third  parties  under
contractual  arrangements.  The  Company's  activities  to date  have  consisted
principally of raising capital, acquiring intellectual property, and contracting
for and managing research and development performed by others. Accordingly,  the
Company is  considered  to be in the  development  stage,  and  expects to incur
increasing  losses  and  require  additional   financial  resources  to  achieve
commercialization of its products.

    Through December 31, 1996, the Company had incurred  cumulative losses since
inception  amounting  to $4.7  million,  and  management  anticipates  incurring
additional  losses for the next several years. The Company is working on several
long-term  development  projects which involve  extensive  research and clinical
testing,  may require many years and substantial  expenditures to complete,  and
which  ultimately  may be  unsuccessful.  Therefore,  the  Company's  ability to
continue as a going concern depends on its ability to raise additional financing
to meet its business plan  objectives  and,  ultimately,  to fund its operations
from  revenues.  Management  believes that it will be able to obtain  additional
funding  through the issuance of debt or equity  securities  to existing and new
investors,  including the Company's  proposed  initial  public  offering or from
strategic  collaborations with other corporations.  If adequate financing is not
available, the Company may be required to delay, scale back or eliminate certain
of its research and development programs, to relinquish rights to certain of its
technologies, product candidates, to forego desired opportunities, or to license
third parties to commercialize  products or technologies  that the Company would
otherwise seek to develop itself.

 ACCOUNTING ESTIMATES

    The  preparation  of  financial  statements  in  conformity  with  generally
accepted  accounting  principles  requires  management  to  make  estimates  and
assumptions that affect the amounts reported in the financial statements.
Actual results could differ from these estimates.

 CASH AND CASH EQUIVALENTS

    The Company considers all highly liquid investments  purchased with original
maturities of three months or less to be cash equivalents.

    The Company  invests its excess cash  primarily  in deposits  with banks and
short-term  securities.  These  securities  consist of U.S.  Treasury bills that
mature or are  redeemable  within 90 days.  The Company has not  recognized  any
material gains or losses on its cash equivalents.

    Management  determines the appropriate  classification of debt securities at
the time of purchase and reevaluates such determination as of each balance sheet
date.  Through  December  31,  1996,  the  Company  has  classified  its  entire
investment portfolio as  available-for-sale.  Available-for- sale securities are
carried at amortized  cost which  approximates  fair value at December 31, 1996.
The  estimated  fair value  amounts have been  determined  by the Company  using
available market information.

                                      F-8



                           JENNER TECHNOLOGIES, INC.
                          (A Development Stage Company)

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

                               DECEMBER 31, 1996

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES -- (CONTINUED)

    The  amortized  cost of debt  securities  is adjusted  for  amortization  of
premiums and accretion of discounts to maturity.  Such  amortization is included
in interest income. Realized gains and losses and declines in value judged to be
other-than-temporary  are  included  in other  income  or  expense.  The cost of
securities  sold is based on the specific  identification  method.  Interest and
dividends are included in interest income.

 PROPERTY AND EQUIPMENT

    Property and equipment are stated at cost.  Depreciation  is provided  using
the  straight-line  method over the  estimated  useful  lives of the  respective
assets, generally three to five years.

 STOCK-BASED COMPENSATION

    As  permitted  by  Statement  of  Financial  Accounting  Standards  No. 123,
"Accounting for Stock-Based  Compensation" ("SFAS 123"), the Company has elected
to account for stock  options  granted to employees  using the  intrinsic  value
method and,  accordingly,  does not recognize  compensation  expense for options
granted to employees at fair value.

 NET LOSS PER SHARE

    Except as noted below,  historical  net loss per share is computed using the
weighted average number of common shares  outstanding.  Common equivalent shares
from  stock  options  and  convertible  preferred  stock are  excluded  from the
computation  as their  effect is  antidilutive,  except  that,  pursuant  to the
Securities and Exchange Commission Staff Accounting Bulletins, common and common
equivalent  shares  issued  during the period  beginning  12 months prior to the
initial filing of the proposed public offering at prices substantially below the
assumed public  offering price have been included in the  calculation as if they
were outstanding for all periods  presented (using the treasury stock method and
the assumed public offering price for stock options).

    Historical net loss per share information is as follows:



                                                                 YEAR ENDED DECEMBER 31,
                                                                 -----------------------
                                                             1994         1995         1996
                                                             ----         ----         ----
                                                                           
Net loss per share                                        $    (0.22) $     (0.27) $     (0.82)
                                                          ==========  ===========  =========== 
Shares used in computing net loss per share                3,263,447    3,275,374    3,275,848
                                                           =========    =========    =========


    Pro forma net loss per share has been  computed as described  above and also
gives  effect  to the  conversion  of  convertible  preferred  shares  that will
automatically  convert upon completion of the Company's  initial public offering
(using the if-converted method) from the original date of issuance.

2. THERATID TRANSACTION

    During  1996,  the  Company  formed  a  subsidiary,   TherAtid  Incorporated
("TherAtid") for the purpose of entering into a license  agreement with Novartis
Corporation  ("Novartis," formerly Ciba-Geigy Limited) (see Note 3). The Company
contributed  approximately  $1,000,000  to TherAtid in  exchange  for  1,818,180
shares of Series A preferred stock and a warrant to purchase 981,820  additional
shares of Series A preferred stock at an exercise price of $2.03.  TherAtid also
issued 692,520 shares of common stock to others,  including 115,420 shares to an
individual who is a member of the Company's Board of Directors and the principal
stockholder of the Company,  for nominal  consideration in connection with their
assistance in securing the Novartis license.


                                      F-9



                           JENNER TECHNOLOGIES, INC.
                          (A Development Stage Company)

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

                               DECEMBER 31, 1996

2. THERATID TRANSACTION -- (CONTINUED)

    In August 1996,  TherAtid was merged with and into the Company.  As a result
of the  merger,  the  Series A  preferred  stock and the  warrant  issued to the
Company were canceled,  and the outstanding shares of TherAtid common stock were
exchanged for an equal number of shares of the Company's common stock.  Prior to
the merger  transaction,  TherAtid had no  operations.  In connection  with this
transaction, the Company recognized $830,000 of research and development expense
which  consists  primarily  of the fair value of common stock issued to complete
the merger and the initial  license  payment by  TherAtid to Novartis  under the
license agreement.

3. RESEARCH LICENSES AND AGREEMENTS

 ELI LILLY AND COMPANY

    The Company has a worldwide exclusive license with Eli Lilly & Company ("Eli
Lilly") for the rights from Eli Lilly to use or  sublicense  certain  technology
and make, use or sell certain  licensed  products  relating to the patent rights
for the use of the KSA tumor associated antigen (the antigen associated with the
Company's OncoVax-CL product candidate).  The agreement calls for the Company to
make certain benchmark  payments to Eli Lilly if certain  milestones are met. No
benchmark payments were made or were due through 1996. If  commercialization  is
achieved,  the Company will be required to pay Eli Lilly a royalty  based on net
sales of the licensed products.

 NOVARTIS

    The  Company  is party to a  license  agreement  with  Novartis.  Under  the
agreement,  Novartis  granted  the  Company an  exclusive  worldwide  license to
certain patent rights and proprietary know-how for the use of various macrophage
activators for the therapy of cancer and related diseases.  In consideration for
this  technology,  the Company  paid  Novartis  an  up-front  license fee and is
required to pay annual  maintenance  fees until certain  conditions of Phase III
clinical trials relating to the technology are met. The Company is also required
to make  benchmark  payments if certain  milestones  are met. As of December 31,
1996, no milestones had been met. Upon commercialization of any licensed product
developed, the Company will pay royalties based on net sales.

 OTHER RESEARCH AGREEMENTS

    The Company has entered into several other agreements with  universities and
other research  organizations.  Such agreements generally require the Company to
make research  support  payments and benchmark  payments upon the achievement of
certain  milestones.  The Company generally owns or has the option to acquire an
exclusive  license to the results of the research and must make royalty payments
on the net  sales of any  products  developed.  Such  agreements  are  generally
cancelable  at the  option of the  Company  upon  notice of up to 30 to 60 days.
Total expenses under such agreements amounted to $50,500, $114,000, $442,000 and
$606,500 in 1994, 1995, 1996 and from inception, respectively.

4. NOTES PAYABLE TO RELATED PARTIES

    From  March  through  May  1996,  the  Company  received  $3,000,000  from a
preferred  stockholder in exchange for a promissory note bearing interest at 10%
per  annum  and  the  right  to  immediately  exercise  a  warrant  held  by the
stockholder  (see Note 5). No accounting  value was ascribed to the value of the
warrant  acceleration,  as such amount was  determined to be not  material.  All
principal and accrued interest under the Note is due and payable on May 6, 1999.
The Note is unsecured.



                                      F-10



                           JENNER TECHNOLOGIES, INC.
                          (A Development Stage Company)

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

                               DECEMBER 31, 1996

5. STOCKHOLDERS' EQUITY

 STOCK SPLIT

    On July 10, 1996, the Company filed restated  Articles of  Incorporation  in
California  to reduce the  authorized  shares of  preferred  and common stock to
30,000,000 and 5,000,000,  respectively,  and to effect a one-for-4.032  reverse
stock split of all  outstanding  shares of common  stock,  Series A and Series B
preferred  stock,  and common stock options and  warrants.  All common share and
preferred stock and per share data in the accompanying  financial statements has
been adjusted to give effect to the reverse stock split.

 COMMON STOCK

    After  liquidation  preference  distributions  to  Series  A  and  Series  B
preferred  stockholders  have been paid,  the  remaining  assets of the  Company
available  for  distribution  to  stockholders  shall be  distributed  among the
holders of Series A preferred  stock,  Series B preferred stock and common stock
pro rata,  based on the  number of shares of common  stock held (or deemed to be
held, on an as-converted basis for preferred shares).

    In connection with the Company's  merger with TherAtid,  the Company assumed
the  repurchase  option  related to 289,017  shares of common  stock  owned by a
director.  One  twenty-fourth  of the shares subject to repurchase were released
from the repurchase option on April 30, 1996 and an additional one twenty-fourth
of the total number of shares are released from the repurchase option at the end
of each full month thereafter,  based upon the director's continued relationship
with the Company.  As of December 31, 1996, 180,636 shares remain subject to the
repurchase option at an aggregate option exercise price of $541.

 CONVERTIBLE PREFERRED STOCK

    Each share of Series A and Series B convertible  preferred stock ("preferred
stock")  is  entitled  to voting  rights  equivalent  to the number of shares of
common stock into which each share can be converted and is  convertible,  at the
option of the holder, into one share of common stock (see Note 7). Conversion is
automatic upon the closing of an  underwritten  public  offering  pursuant to an
effective registration statement under the Securities Act of 1933, which results
in a price per share of not less than $13.97 and aggregate  offering proceeds of
not  less  than  $7,500,000  or  upon  the  approval  of  more  than  80% of all
outstanding  preferred stock voting together as a single class.  The Company has
reserved  sufficient  shares of common stock for issuance upon conversion of the
outstanding Series A and Series B preferred stock.

    The Series A preferred  shares are  subject to  liquidation  preferences  of
$0.8064  per  share,  plus an  additional  amount  equal to  $0.0605  per  share
multiplied by the number of years the share was held prior to the effective date
of liquidation,  plus all declared but unpaid dividends.  The Series B preferred
shares  are  subject to  liquidation  preferences  of $1.2096  per share plus an
additional  amount equal to $0.0907 per share  multiplied by the number of years
the share was held  prior to the  effective  date of  liquidation.  Series A and
Series B preferred stockholders are entitled to noncumulative dividends at rates
of $0.0605 and $0.0907 per share,  respectively,  per annum,  if declared by the
Board of Directors  and in preference  to common stock  dividends.  No dividends
have been declared or paid by the Company.

 STOCK OPTIONS

    During 1993,  nonqualified  stock  options for 28,629 shares of common stock
were  granted to  consultants  at an  exercise  price of $0.007  per  share.  At
December  31,  1996,  14,314  of  these  options  remain   outstanding  and  are
exercisable.  The 1993 Stock Plan (the  "Plan") was  adopted in  February  1993.
Stock options  granted under the Plan may be either  incentive  stock options or
nonstatutory stock



                                      F-11



                           JENNER TECHNOLOGIES, INC.
                          (A Development Stage Company)

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

                               DECEMBER 31, 1996

5. STOCKHOLDERS' EQUITY -- (CONTINUED)

options.  Incentive  stock  options may be granted to  employees  with  exercise
prices of no less than the fair value and nonstatutory options may be granted to
employees  or  consultants  at  exercise  prices of no less than 85% of the fair
value of the  common  stock on the grant  date,  as  determined  by the Board of
Directors.  If, at the time the Company grants an option,  the optionee directly
or by  attribution  owns stock  possessing  more than 10% of the total  combined
voting power of all classes of stock of the  Company,  the option price shall be
at least  110% of the fair  value and shall  not be  exercisable  more than five
years after the date of grant.  Options may be granted  with  different  vesting
terms from time to time.  Except as noted above,  options expire no more than 10
years after the date of grant or earlier if employment is terminated.

    During  1996,  the Company  adopted  SFAS 123.  The effect of  applying  the
minimum  value  method of SFAS 123 to options  granted to  employees in 1995 and
1996 did not  result in pro forma net loss and loss per share  amounts  that are
materially different from historical amounts reported. Therefore, such pro forma
information  is not presented  herein.  SFAS 123 is  applicable  only to options
granted  subsequent  to December 31, 1994,  and should the Company  successfully
complete the  offering,  it will no longer be able to utilize the minimum  value
method,  therefore,  the  pro  forma  effect  determined  in  1996  may  not  be
representative  of the pro forma  effect to be  reported  in future  years.  The
minimum  value  method  was  applied  using  the  following   weighted   average
assumptions for 1995 and 1996,  respectively:  risk-free interest rates of 6.09%
and 6.53%; an expected option life of six years; and no annual dividends.

    A  summary  of  activity  under  the Plan for the years  ended  December  31
follows:



                                         1994                 1995                 1996
                                  -------------------  ------------------   ------------------
                                            WEIGHTED             WEIGHTED             WEIGHTED
                                             AVERAGE              AVERAGE              AVERAGE
                                            EXERCISE             EXERCISE             EXERCISE
                                  OPTIONS     PRICE    OPTIONS     PRICE    OPTIONS     PRICE
                                  -------     -----    -------     -----    -------     -----
                                                                     
Outstanding at January 1           11,452     $0.14     17,463     $0.14    160,592    $ 0.20
Granted                             7,443     $0.14    143,129     $0.21    111,076    $ 0.23
Exercised                            (359)    $0.14         --     $  --     (1,591)   $ 0.22
Forfeited                          (1,073)    $0.14         --     $  --         --    $   --
                                   ------              -------              -------    ------
Outstanding at December 31         17,463     $0.14    160,592     $0.20    270,077    $ 0.19
                                   ======              =======              =======    ======


    Exercise  prices of all options  outstanding  as of December 31, 1996 ranged
from  $0.007 to $0.24 and  117,441 of such  options  were vested with a weighted
average  exercise  price of  $0.18.  As of  December  31,  1996,  the  remaining
contractual life of outstanding  options ranged from 6.2 years to 9.6 years with
a weighted average contractual life of 8.8 years.

    In connection with grants of stock options to employees and directors during
1996, the Company  recorded  $52,000 for the difference  between the deemed fair
value  of the  Company's  common  stock  for  financial  statement  presentation
purposes and the  exercise  price at the date of grant.  Of such amount,  $7,000
related to options that vested prior to December 31, 1996 and, accordingly,  was
expensed  in the year then  ended.  The  remaining  $45,000  is  presented  as a
component  of  stockholders'  equity at December  31, 1996 and will be amortized
over the vesting period of the  underlying  options.  The weighted  average fair
value of options  granted  during 1996 with an  exercise  price below the deemed
fair value of the Company's  common stock for financial  statement  presentation
purposes on the date of grant was $0.23.


                                      F-12



                           JENNER TECHNOLOGIES, INC.
                          (A Development Stage Company)

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

                               DECEMBER 31, 1996

5. STOCKHOLDERS' EQUITY -- (CONTINUED)

 WARRANT

    In connection with the sale of Series B preferred stock in 1995, the Company
issued a warrant to  purchase  2,146,931  shares of common  stock at an exercise
price of $0.04 per share to the  Series B  investor.  In 1996,  the  stockholder
exercised a portion of the warrant to purchase  715,649  shares of common stock.
In May 1996,  the Company  entered into an  agreement  with the  stockholder  to
provide the stockholder with the right to immediately exercise the warrant as to
286,258  shares of the Company's  common stock in exchange for  terminating  the
warrant  with  respect  to all  remaining  shares.  Under  this  agreement,  the
stockholder exercised his right to purchase the 286,258 shares.

 RESERVED SHARES

    As of December 31, 1996, the Company has reserved shares of common stock for
future issuance as follows:



                                                                    
 Stock option plan:
   Outstanding options                                                   270,077
   Reserved for future grants (see Note 7)                                85,809
Convertible preferred stock:
  Issued and outstanding                                               1,510,015
                                                                       ---------
                                                                       1,865,901
                                                                       =========


6. INCOME TAXES

    The  Company  uses the  liability  method to  account  for  income  taxes as
required by Statement of Financial Accounting Standards No. 109, "Accounting for
Income  Taxes."  Under this  method,  deferred  tax assets and  liabilities  are
determined  based on differences  between  financial  reporting and tax bases of
assets and  liabilities  and are measured  using enacted tax rules and laws that
will be in effect when the differences are expected to reverse.

    Significant  components of the Company's deferred tax assets and liabilities
for federal and state income taxes as of December 31 are as follows:



                                                          1995          1996
                                                        ---------    -----------
                                                                               
Deferred tax assets:
   Net operating loss carryforwards                     $ 700,000    $ 1,400,000
   Capitalized license agreement                               --        300,000
   Research credit carryforwards                               --        100,000
   Capitalized research and development                        --        100,000
   Other, net                                             100,000        100,000
                                                          -------        -------
   Net deferred tax assets                                800,000      2,000,000
Valuation allowance                                      (800,000)    (2,000,000)
                                                         --------     ---------- 
Net deferred tax assets                                  $     --     $      -- 
                                                         ========     ==========




    The net valuation allowance  increased by $130,000,  $670,000 and $1,200,000
in 1994, 1995 and 1996, respectively.

                                      F-13




                           JENNER TECHNOLOGIES, INC.
                          (A Development Stage Company)

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

                               DECEMBER 31, 1996


6. INCOME TAXES -- (CONTINUED)

    As of December 31, 1995 and 1996, the Company had federal net operating loss
carryforwards of approximately  $1,800,000 and $3,700,000,  respectively.  As of
December  31,  1995  and  1996,  the  Company  also  had  federal  research  and
development  tax credit  carryforwards  of  approximately  $22,000 and  $40,000,
respectively.  The net operating  loss and credit  carryforwards  will expire at
various dates beginning in 2008 and 2011, if not utilized.

    Utilization  of the net  operating  losses and  credits  may be subject to a
substantial annual limitation due to the "change in ownership" provisions of the
Internal  Revenue  Code  of  1986  and  similar  state  provisions.  The  annual
limitation  may result in the  expiration  of net  operating  losses and credits
before utilization.

7. PROPOSED INITIAL PUBLIC OFFERING AND RELATED MATTERS

    In January 1997, the Board of Directors  authorized the  reincorporation  of
the Company in the State of Delaware and a one-for-1.7328 reverse stock split of
all outstanding shares of common stock and stock options. The reincorporation is
expected to occur in March 1997. The conversion ratio of all outstanding  shares
of  convertible  preferred  stock were adjusted such that each  preferred  share
converts into 0.577 shares of common stock.  All common share and per share data
in the accompanying financial statements has been adjusted retroactively to give
effect to the reverse stock split.

    In January 1997, the Board of Directors authorized management of the Company
to file a Registration  Statement  with the  Securities and Exchange  Commission
offering shares of its common stock and warrants to the public.  If the offering
is consummated under the terms presently anticipated, all of the preferred stock
outstanding  will  automatically  convert into 1,510,015  shares of common stock
upon the closing of the offering.  Unaudited pro forma stockholders' equity (Net
Capital  deficiency)  as of  December  31,  1996 as  adjusted  for  the  assumed
conversion  of the  preferred  stock is set  forth in the  accompanying  balance
sheet.

    In January 1997,  the Board of Directors  approved the Company's  1997 Stock
Plan (the "1997  Plan")  and  initially  reserved  350,000  shares for  issuance
thereunder.  The 1997 Plan provides for the grant of incentive stock options and
stock purchase rights to employees and employee directors and nonstatutory stock
options and stock purchase rights to employees, directors and consultants.


                                      F-14





================================================================================

NO  DEALER,  SALESPERSON  OR ANY OTHER  PERSON HAS BEEN  AUTHORIZED  TO GIVE ANY
INFORMATION OR TO MAKE ANY  REPRESENTATIONS  OTHER THAN THOSE  CONTAINED IN THIS
PROSPECTUS AND, IF GIVEN OR MADE, SUCH INFORMATION OR  REPRESENTATIONS  MUST NOT
BE RELIED UPON AS HAVING  BEEN  AUTHORIZED  BY THE  COMPANY OR ANY  UNDERWRITER.
NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL, UNDER
ANY  CIRCUMSTANCES,  CREATE ANY IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE
AFFAIRS OF THE COMPANY SINCE THE DATE HEREOF OR THAT THE  INFORMATION  CONTAINED
HEREIN IS CORRECT AS OF ANY DATE SUBSEQUENT TO THE DATE HEREOF.  THIS PROSPECTUS
DOES NOT  CONSTITUTE AN OFFER TO SELL OR A  SOLICITATION  OF AN OFFER TO BUY ANY
SECURITIES  OFFERED HEREBY BY ANYONE IN ANY  JURISDICTION IN WHICH SUCH OFFER OR
SOLICITATION  IS NOT  AUTHORIZED  OR IN WHICH THE  PERSON  MAKING  SUCH OFFER OR
SOLICITATION  IS NOT  QUALIFIED  TO DO SO OR TO ANYONE TO WHOM IT IS UNLAWFUL TO
MAKE SUCH OFFER OR SOLICITATION.

                                   ----------

                                TABLE OF CONTENTS



                                                                            PAGE
                                                                           
Prospectus Summary                                                             3
Risk Factors                                                                   7
Use of Proceeds                                                               18
Dividend Policy                                                               18
Capitalization                                                                19
Dilution                                                                      20
Selected Financial Data                                                       21
Management's Discussion and Analysis of
  Financial Condition and Results of
  Operations                                                                  22
Business                                                                      24
Management                                                                    38
Certain Transactions                                                          44
Principal Stockholders                                                        45
Description of Securities                                                     47
Shares Eligible for Future Sale                                               50
Underwriting                                                                  52
Legal Matters                                                                 54
Experts                                                                       54
Additional Information                                                        54
Index to Financial Statements                                               F-1


    UNTIL  _________,  1997 (25 DAYS  AFTER  THE DATE OF THIS  PROSPECTUS),  ALL
DEALERS  EFFECTING  TRANSACTIONS  IN THE REGISTERED  SECURITIES,  WHETHER OR NOT
PARTICIPATING IN THE DISTRIBUTION, MAY BE REQUIRED TO DELIVER A PROSPECTUS. THIS
DELIVERY  REQUIREMENT IS IN ADDITION TO THE OBLIGATIONS OF DEALERS WHO DELIVER A
PROSPECTUS  WHEN  ACTING  AS  UNDERWRITERS  AND WITH  RESPECT  TO  THEIR  UNSOLD
ALLOTMENTS OR SUBSCRIPTIONS.  
================================================================================



================================================================================




                                     [LOGO]

                            JENNER TECHNOLOGIES, INC.

                        2,500,000 SHARES OF COMMON STOCK
                                       AND
                          2,500,000 REDEEMABLE COMMON
                            STOCK PURCHASE WARRANTS


                                   ----------
                                   PROSPECTUS
                                   ----------


                               NATIONAL SECURITIES
                                   CORPORATION




                                     , 1997


================================================================================



                                    PART II
                   INFORMATION NOT REQUIRED IN THE PROSPECTUS

ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

    The  following  table  sets  forth  the  costs  and  expenses,   other  than
underwriting  discounts  and  commissions,  payable by the Company in connection
with the sale of the  Securities  being  registered.  All amounts are  estimates
except the SEC  registration  fee,  the NASD filing fee and the  American  Stock
Exchange application fee.



                                                                       AMOUNT TO
                                                                        BE PAID
                                                                        -------
                                                                    
SEC Registration Fee                                                   $  18,522
NASD Filing Fee                                                            6,612
American Stock Exchange Application Fee                                   33,000
Blue Sky Qualification Fees and Expenses                                  15,000
Printing and Engraving Expenses                                          120,000
Legal Fees and Expenses                                                  250,000
Accounting Fees and Expenses                                             130,000
Transfer Agent and Registrar Fees                                         10,000
Miscellaneous                                                             16,866
                                                                        --------
   Total                                                                $600,000


ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

    Section  145  of  the  Delaware  General  Corporation  Law  allows  for  the
indemnification  of officers,  directors and any  corporate  agents in the terms
sufficiently  broad to indemnify  such persons under certain  circumstances  for
liabilities  (including  reimbursement for expenses  incurred) arising under the
Securities  Act of 1933,  as amended  (the  "Act").  The  Registrant's  Restated
Certificate  of  Incorporation  to be filed upon the closing of the  offering to
which  this  Registration   Statement  relates  (Exhibit  3.3  hereto)  and  the
Registrant's  Bylaws (Exhibit 3.5 hereto)  provides for  indemnification  of the
Registrant's directors,  officers,  employees and other agents to the extent and
under the circumstances  permitted by the Delaware General  Corporation Law. The
Registrant  also  intends  to  enter  into  agreements  with its  directors  and
executive  officers  that will  require the  Registrant  among  other  things to
indemnify  them against  certain  liabilities  that may arise by reason of their
status or service as directors to the fullest  extent not prohibited by Delaware
law.

    The Underwriting  Agreement provides for indemnification by the Underwriters
of the  Registrant,  its directors and  officers,  and by the  Registrant of the
Underwriters,  for certain liabilities,  including liabilities arising under the
Act, and affords certain rights of contribution with respect thereto.

ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES.

    (a) Since January 1994, the Registrant has sold and issued the
following securities:

       1. On January 18, 1994,  the Company  issued and sold  992,056  shares of
    Series A Preferred Stock to a director of the Company upon the exercise of a
    warrant  originally  issued May 7, 1993 at an exercise  price of $0.8060 per
    share.

       2. From April 18, 1994 to January 31,  1997,  the Company  granted  stock
    options  under the  Company's  1993  Incentive  Stock  Plan to  purchase  an
    aggregate of 355,370 shares of Common Stock to 16 employees and  consultants
    at exercise prices ranging from $0.14 to $3.00 per share.

       3. On April 29, 1994, the Company issued an aggregate of 20,756 shares of
    Common Stock to two individuals and one entity at an issuance price of $0.14
    per share in connection with a Settlement Agreement dated April 29, 1994.


                                      II-1



       4. From June 1, 1994 to March 5, 1996,  the Company issued and sold 7,158
    shares of Common  Stock to a director  of the Company  upon the  exercise of
    non-plan stock options at an exercise price of $0.00693 per share.

       5. On October 31, 1994,  the Company issued and sold 359 shares of Common
    Stock to one  employee  upon the  exercise  of stock  options at an exercise
    price of $0.14 per share  pursuant to the  Company's  1993  Incentive  Stock
    Plan.

       6. From January 1, 1995 to November 30, 1996, the Company issued and sold
    7,157 shares of Common Stock to one individual upon the exercise of non-plan
    stock options at an exercise price of $0.00693 per share.

       7. On July 25, 1995, the Company issued and sold 496,028 shares of Series
    B Preferred Stock and a warrant  exercisable for 2,146,931  shares of Common
    Stock to a  director  of the  Company  for an  aggregate  purchase  price of
    $600,100.00. On March 18, 1996, the warrant was exercised for 715,649 shares
    of Common Stock for an aggregate purchase price of $50,000.  On May 6, 1996,
    the  warrant  was  exercised  for  286,258  shares  of  Common  Stock for an
    aggregate  purchase  price of $20,000,  and was then canceled  pursuant to a
    Warrant Amendment, Exercise and Termination Agreement.

       8. On August 8, 1996,  the Company  issued an aggregate of 692,520 shares
    of Common  Stock to two  directors  of the  Company in  connection  with the
    acquisition of TherAtid Incorporated by the Company.

       9. From  October 31, 1996 to December 31,  1996,  the Company  issued and
    sold 1,591  shares of Common  Stock to a director  of the  Company  upon the
    exercise of stock options at an exercise price of $0.23 per share,  pursuant
    to the Company's 1993 Incentive Stock Plan.

    The sales of the above securities were deemed to be exempt from registration
under the Securities  Act in reliance on Section 4(2) of the Securities  Act, or
Regulation D promulgated thereunder,  or Rule 701 promulgated under Section 3(b)
of the  Securities  Act as  transactions  by an issuer  not  involving  a public
offering or transactions  pursuant to  compensatory  benefit plans and contracts
relating to  compensation  as provided  under such Rule 701. The  recipients  of
securities in each such transaction  represented  their intention to acquire the
securities for investment  only and not with a view to or for sale in connection
with any distribution  thereof and appropriate legends were affixed to the share
certificates  and  warrants  issued in such  transactions.  All  recipients  had
adequate access,  through their  relationships with the Company,  to information
about the Registrant.

ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.

(a) Exhibits


 EXHIBIT
   NO.                                            TITLE
   ---                                            -----
1.1    -- Form of Underwriting Agreement.
3.1    -- Amended and Restated Articles of Incorporation as currently in effect.
3.2    -- Form of Restated Certificate of Incorporation to be filed after the
          closing of this Offering made under this Registration Statement.
3.3    -- Bylaws of the Registrant as currently in effect.
3.4    -- Form of Bylaws of the Registrant to be effective upon the closing of
          this Offering made under this Registration Statement.
4.1*   -- Specimen Common Stock Certificate.
4.2*   -- Specimen Warrant Certificate.

                                      II-2


 EXHIBIT
   NO.                                            TITLE
   ---                                            -----
4.3*   -- Form of Representative's Warrant Agreement between the Registrant and 
          the Representative, including form of Representative's Warrant.
4.4*   -- Form of Warrant Agreement between the Registrant and Continental Stock
          Transfer and Trust Company, including form of Warrant.
5.1*   -- Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation.
10.1   -- Form of Indemnification Agreement for directors and officers.
10.2   -- 1993 Incentive Stock Plan.
10.3   -- 1997 Incentive Stock Plan and form of agreement thereunder.
10.4   -- Note Purchase Agreement between the Registrant and Hayden Leason
          dated May 6, 1996, and Promissory Note issued pursuant thereto.
10.5** -- License Agreement between the Registrant(as successor) and Ciba-Geigy,
          Ltd. dated April 4, 1996.
10.6** -- License Agreement between the Registrant and Eli Lilly and Company 
          dated June 15, 1994.
10.7** -- License Agreement between the Registrant and Research Corporation 
          Technologies, Inc., dated June 1, 1994.
10.8** -- License Agreement between the Registrant and Walter Reed Army 
          Institute of Research dated March 29, 1996.
10.9** -- Cooperative Research and Development Agreement between the Registrant
          and Walter Reed Army Institute of Research dated September 30, 1993 
          and revised March 7, 1995.
10.10  -- Employment agreement between the Registrant and Anthony E. Maida, III.
          dated November 20, 1994.
10.11  -- Employment Agreement between the Registrant and Dr. Lynn E. Spitler 
          dated November 20, 1994.
10.12  -- Employment Agreement between the Registrant and Thomas P.H. Twaddell,
          M.D. dated January 6, 1997.
10.13  -- First Amended and Restated Investors Rights Agreement dated July 25, 
          1995.
10.14  -- Lease agreement between the Registrant and Bay Business Centers, Inc. 
          dated August 13, 1996.
11.1   -- Statement of computation of net loss per share.
23.1   -- Consent of Wilson Sonsini Goodrich & Rosati, P.C. (See Exhibit 5.1).
23.2   -- Consent of Ernst & Young LLP, Independent Auditors
25.1   -- Power of Attorney (See page II-5).
27.1   -- Financial Data Schedule.

- ---------
 * To be filed by amendment.
** Confidential treatment requested.

    (b) Financial Statements

       (1) Financial Statements

    The financial  statements filed as part of this  Registration  Statement are
listed in the Index to Financial Statements of the Company on Page F-1.


                                      II-3


ITEM 17. UNDERTAKINGS.

    The undersigned Registrant hereby undertakes that:

       (a) It will  provide to the  Underwriters  at the closing as specified in
    the Underwriting Agreement certificates in such denominations and registered
    in such names as required by the  Underwriters  to permit prompt delivery to
    each purchaser.

       (b) Insofar as indemnification by the Registrant for liabilities  arising
    under  the  Securities  Act may be  permitted  to  directors,  officers  and
    controlling persons of the Registrant,  the Registrant has been advised that
    in  the  opinion  of  the   Securities   and   Exchange   Commission,   such
    indemnification  is against public policy as expressed in the Securities Act
    and  is,   therefore,   unenforceable.   In  the  event  that  a  claim  for
    indemnification  against  such  liabilities  (other  than the payment by the
    Registrant  of  expenses  incurred  or  paid  by  a  director,   officer  or
    controlling  person  of the  Registrant  in the  successful  defense  of any
    action,  suit or  proceeding)  is  asserted  by such  director,  officer  or
    controlling  person in connection with the securities being registered,  the
    Registrant  will,  unless in the  opinion  of  counsel  the  matter has been
    settled  by  controlling  precedent,   submit  to  a  court  of  appropriate
    jurisdiction  the  question  whether such  indemnification  by it is against
    public policy as expressed in the Securities Act and will be governed by the
    final adjudication of such issue.

       (c) For purposes of determining  any liability  under the Securities Act,
    the  information  omitted  from  the form of  prospectus  filed as part of a
    registration  statement in reliance upon Rule 430A and contained in the form
    of prospectus  filed by the Registrant  pursuant to Rule 424(b)(1) or (4) or
    497(h)  under  the  Securities  Act  shall  be  deemed  to be  part  of  the
    registration statement as of the time it was declared effective.

       (d) For the purpose of  determining  any liability  under the  Securities
    Act, each post-effective  amendment that contains a form of prospectus shall
    be deemed to be a new  registration  statement  relating  to the  securities
    offered  therein,  and the offering of such securities at that time shall be
    deemed to be the initial bona fide offering thereof.

    The undersigned Registrant hereby undertakes:

       (a) To file, during any period in which offers or sales are being made, a
    post-effective amendment to this Registration Statement:

           (i) to include any prospectus required by Section 10(a)(3) of
       the Securities Act;

           (ii) to reflect in the  prospectus  any facts or events arising after
       the  effective  date of the  Registration  Statement  (or the most recent
       post-effective   amendment   thereof)  which,   individually  or  in  the
       aggregate, represent a fundamental change in the information set forth in
       this Registration Statement.  Notwithstanding the foregoing, any increase
       or decrease in volume of  securities  offered (if the total dollar volume
       of securities offered would not exceed that which was registered) and any
       deviation  from the low or high  end of the  estimated  maximum  offering
       range  may  be  reflected  in the  form  of  prospectus  filed  with  the
       Commission  pursuant to Rule 424(b) if, in the aggregate,  the changes in
       volume  and  price  represent  no more than a 20%  change in the  maximum
       aggregate  offering price set forth in the  "Calculation  of Registration
       Fee" table in the effective registration statement;

           (iii) to include any material information with respect to the plan of
       distribution not previously  disclosed in the  Registration  Statement or
       any material change to such information in the Registration Statement;

       (b)  That,  for the  purpose  of  determining  any  liability  under  the
    Securities Act, each such  post-effective  amendment shall be deemed to be a
    new registration  statement relating to the securities offered therein,  and
    the  offering  of such  securities  at that  time  shall be deemed to be the
    initial bona fide Offering thereof;

       (c) To remove from  registration by means of a  post-effective  amendment
    any  of  the  securities   being  registered  which  remain  unsold  at  the
    termination of the offering.


                                      II-4


                                   SIGNATURES

    PURSUANT TO THE REQUIREMENTS OF THE ACT, THE REGISTRANT HAS DULY CAUSED THIS
REGISTRATION STATEMENT TO BE SIGNED ON ITS BEHALF BY THE UNDERSIGNED,  THEREUNTO
DULY AUTHORIZED,  IN THE CITY OF SAN RAMON, STATE OF CALIFORNIA, ON FEBRUARY 14,
1997.

                                            JENNER TECHNOLOGIES, INC.


                                            By:  /s/ ANTHONY E. MAIDA, III
                                                 -------------------------
                                                   ANTHONY E. MAIDA, III,
                                                   CHIEF EXECUTIVE OFFICER

                             POWER OF ATTORNEY

    KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears
below constitutes and appoints, Anthony E. Maida, III and Lynn E. Spitler, M.D.,
and each of them acting  individually,  as his  attorney-in-fact,  each with the
power of  substitution,  for him in any and all capacities,  to sign any and all
amendments (including post-effective amendments) to this Registration Statement,
and to sign any  registration  statement for the same  offering  covered by this
Registration  Statement  that is to be  effective  upon filing  pursuant to Rule
462(b)  promulgated  under the Securities  Act of 1933,  and all  post-effective
amendments  thereto,  and to file the same, with all exhibits  thereto and other
documents in connection therewith,  with the Securities and Exchange Commission,
granting unto said  attorneys-in-fact  and agents,  and each of them, full power
and  authority  to do and  perform  each and every act and thing  requisite  and
necessary  to be done in and about the  premises,  as fully to all  intents  and
purposes as he might or could do in person,  hereby ratifying and confirming all
that  such  attorneys-in-fact  and  agents  or any  of  them,  or  his or  their
substitute  or  substitutes,  may  lawfully  do or  cause  to be done by  virtue
thereof.

    PURSUANT TO THE  REQUIREMENTS  OF THE ACT, THIS  REGISTRATION  STATEMENT HAS
BEEN  SIGNED  BY THE  FOLLOWING  PERSONS  IN  THE  CAPACITIES  AND ON THE  DATES
INDICATED.




             SIGNATURE                                    TITLE                                         DATE
             ---------                                    -----                                         ----
                                                                                            
   /s/ ANTHONY E. MAIDA, III            Chief Executive Officer  and Director
- -------------------------------          (Principal Executive Officer)                            February 14, 1997
       ANTHONY E. MAIDA, III                                                   

   /s/ ANTHONY E. MAIDA, III           Chief Financial Officer (Principal
- -------------------------------          Financial and Accounting Officer)                        February 14,  1997
       ANTHONY E. MAIDA, III            

      /s/ LYNN E. SPITLER              President, Chief Scientific
- -------------------------------          Officer and Director                                     February 14,  1997
       LYNN E. SPITLER, M.D.            

        /s/ JACK BOWMAN
- ------------------------------- 
            JACK BOWMAN                  Director                                                 February 14,  1997

      /s/ LOWELL M. DICKE
- ------------------------------- 
          LOWELL M. DICKE                Director                                                 February 14,  1997

     /s/ ISAIAH J. FIDLER
- ------------------------------- 
  ISAIAH J. FIDLER, D.V.M., PH.D.        Director                                                 February 14,  1997

     /s/ ROBERT A. FILDES
- ------------------------------- 
      ROBERT A. FILDES, PH.D.            Director                                                 February 14,  1997

     /s/ HERBERT GROSSMAN
- ------------------------------- 
          HERBERT GROSSMAN               Director                                                 February 14,  1997

       /s/ HAYDEN LEASON
- ------------------------------- 
           HAYDEN LEASON                 Director                                                 February 14, 1997




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