COMPANY CONTACT:
Cytogen Corporation
Stacy Shearer
Investor Relations
(609) 750-8289
sshearer@cytogen.com

            CYTOGEN REPORTS FOURTH QUARTER AND FULL YEAR 2004 RESULTS

PRINCETON,  N.J., (FEBRUARY 23, 2005) -- Cytogen Corporation  (Nasdaq:  CYTO), a
product-driven  biopharmaceutical  company, today reported its financial results
for the fourth quarter and full year ended December 31, 2004.

FOURTH QUARTER & FULL YEAR 2004 FINANCIAL HIGHLIGHTS
- ----------------------------------------------------

  o  Consistent with the Company's  previously issued revised financial guidance
     for 2004,  total  product  revenues  were a record  $14.5  million  in 2004
     compared to $9.8 million in 2003,  driven by 10%  year-over-year  growth in
     PROSTASCINT(R)  (capromab pendetide) sales and the positive contribution of
     QUADRAMET(R)   (samarium  Sm-153   lexidronam   injection)   following  the
     reacquisition  of marketing  rights to that product in 2003.
  o  For the year ended December 31, 2004,  Cytogen reported a net loss of $20.5
     million, or $1.40 per basic and diluted share, compared to $9.4 million, or
     $0.92 per basic and diluted share,  for the same period in 2003.
  o  In 2004,  Cytogen  achieved an average gross margin of  approximately  36%,
     which reflects QUADRAMET and PROSTASCINT  manufacturing costs and royalties
     to Dow Chemical and Berlex Laboratories.
  o  Aggregate  selling,  general  and  administrative,  internal  research  and
     development, and joint venture research and development expenses were $26.4
     million in 2004,  which  compares  favorably to the  Company's  guidance of
     $26.5 million to $27.2 million.
  o  Fourth quarter  product  revenues  totaled $3.7 million in 2004 compared to
     $3.4  million in 2003,  driven  primarily by 18%  year-over-year  growth in
     QUADRAMET  sales.
  o  For the  fourth  quarter  of  2004,  Cytogen  reported  a net  loss of $6.3
     million,  or $0.41 per basic and diluted  share,  compared to a net loss of
     $3.1 million,  or $0.26 per basic and diluted share, for the same period in
     2003.

"2004 was a  successful  and  productive  year for Cytogen as we executed on our
strategies for enhancing our commercial  infrastructure to support both existing
and future oncology  products," said Michael D. Becker,  Cytogen's President and
Chief Executive  Officer.  "For 2005, we will remain focused on achieving strong
sales growth while  simultaneously  expanding  the  development  of our marketed
products  beyond  their  current  indications  through new and ongoing  clinical
studies,  advancing  our  development  pipeline,  and  executing on our business
development initiatives."

PRODUCT REVENUE
- ---------------

QUADRAMET

Sales of QUADRAMET,  a fast-acting,  long-lasting  non-opioid  treatment for the
relief of pain due to metastatic  bone disease  arising from  prostate,  breast,
multiple  myeloma and other types of cancer,  were $1.9  million for the quarter
ended  December  31, 2004  compared to $1.6 million for the same period in 2003.
For the year ended




December 31, 2004,  QUADRAMET  sales were $7.3 million  compared to $2.8 million
for the same period in 2003.

Under a 1998 agreement,  Berlex  Laboratories had marketing rights for QUADRAMET
in North and Latin America. Through July 31, 2003, Cytogen received and reported
royalties on product  sales made by Berlex.  Such royalty  revenue from sales of
QUADRAMET during the year ended December 31, 2003 was $1.1 million. On August 1,
2003,  Cytogen  reacquired these marketing rights from Berlex in exchange for an
upfront  cash  payment of $8.0  million and  royalties  based on future sales of
QUADRAMET.  At that time, Cytogen began recording product revenue from the sales
of QUADRAMET.

                            QUADRAMET REVENUE SUMMARY
                                ($'s in millions)

                 2003   2003   2003  2003       2004   2004   2004   2004
                  Q1     Q2     Q3    Q4         Q1     Q2     Q3     Q4
                 ----   ----   ----  ----       ----   ----   ----  ----

Product Sales     n/a    n/a   $1.2  $1.6       $1.9   $1.6   $1.9  $1.9
Royalties        $0.4   $0.5   $0.2   n/a        n/a    n/a    n/a   n/a
                 ----   ----   ----  ----       ----   ----   ----  ----
TOTAL:           $0.4   $0.5   $1.4  $1.6       $1.9   $1.6   $1.9  $1.9


PROSTASCINT

Sales  of  PROSTASCINT  kits  for the  preparation  of  Indium  In-111  capromab
pendetide,  the  first  and  only  commercial  monoclonal  antibody-based  agent
targeting  prostate-specific  membrane  antigen  (PSMA) to image the  extent and
spread of prostate  cancer,  were $1.8  million for each of the  quarters  ended
December 31, 2004 and 2003.  For the year ended  December 31, 2004,  PROSTASCINT
sales were $7.2 million compared to $6.5 million for the same period in 2003.

                           PROSTASCINT REVENUE SUMMARY
                                ($'s in millions)

                      2003    2003   2003    2003       2004   2004   2004  2004
                       Q1      Q2     Q3      Q4         Q1     Q2     Q3    Q4
                      ----    ----   ----    ----       ----   ----   ----  ----

Product Sales         $1.6    $1.6   $1.5    $1.8       $1.7   $2.3   $1.3  $1.8


OTHER PRODUCT REVENUE
- ---------------------

Other  product  revenue,   consisting  of  both  brachytherapy  products  and  a
point-of-care  diagnostic test for bladder  cancer,  were not significant in the
fourth  quarter or year ended December 31, 2004 compared to $56,000 and $535,000
in the fourth  quarter and year ended December 31, 2003,  respectively.  Cytogen
discontinued marketing brachytherapy products effective January 24, 2003 and the
diagnostic test for bladder cancer effective December 31, 2004.

LICENSE AND CONTRACT REVENUE
- ----------------------------

License and contract revenue for the fourth quarter of 2004 was $67,000 compared
to $87,000 for the same period in 2003.  For the year ended  December  31, 2004,
license and contract revenue was $139,000  compared to $2.9 million for the same
period in 2003.  License and  contract  revenue for the year ended  December 31,
2003 included the accelerated recognition of $1.9 million of previously deferred
revenue as a result of the Company's  termination of the 1998 license  agreement
for QUADRAMET with Berlex Laboratories in August 2003.




COSTS AND EXPENSES
- ------------------

Total  operating  expenses  for the quarter  ended  December 31, 2004 were $10.5
million compared to $7.0 million for the same period in 2003. For the year ended
December 31, 2004, total operating expenses were $35.7 million compared to $24.0
million for the same period in 2003.  Cost of product  related  revenues in 2004
primarily reflect QUADRAMET and PROSTASCINT  manufacturing costs, royalties paid
by Cytogen to Dow Chemical and Berlex  Laboratories  on the  Company's  sales of
QUADRAMET,  and the  amortization of the up-front payment to Berlex to reacquire
the  marketing  rights to  QUADRAMET.  The  year-over-year  increase in selling,
general and  administrative  expenses is primarily driven by an expansion of the
Company's sales force and the  implementation  of new marketing  initiatives for
the Company's existing and anticipated oncology products.

The 2004 and 2003 operating expenses also reflect costs associated with the PSMA
Development  Company LLC ("PDC"),  a joint venture between Cytogen and Progenics
Pharmaceuticals,  Inc., for the development of in vivo immunotherapies targeting
PSMA.  Cytogen's  share of the  equity in the loss of PDC was  $740,000  for the
fourth quarter of 2004 compared to $772,000 for the same period in 2003. For the
year ended December 31, 2004,  Cytogen's  share of the equity in the loss of PDC
was $2.9 million compared to $3.5 million for the same period of 2003.

CASH POSITION
- -------------

Cytogen's  cash,  cash  equivalents  and  short-term  investments  balance as of
December 31, 2004 was $35.8 million compared to $30.2 million as of December 31,
2003. In April 2004, the Company  received net proceeds of  approximately  $24.0
million in connection with a registered  direct offering of 2,570,000  shares of
its common stock.

2004 HIGHLIGHTS
- ---------------

QUADRAMET

  o  Publication of a prospective,  randomized,  double-blind multi-center phase
     III study confirming that QUADRAMET  provides  significant pain relief from
     metastatic bone disease arising from prostate cancer. The study appeared in
     the May 2004 issue of the peer-reviewed medical journal Urology (Sartor, O.
     et al,  "Samarium-153-Lexidronam  Complex  for  Treatment  of Painful  Bone
     Metastases in Hormone- Refractory Prostate Cancer," Urology, Volume 63, No.
     5,  pp.  940-945).
  o  Initiation  of the  National  Bone Pain  Management  Registry,  a major new
     initiative  related to QUADRAMET,  in November  2004.  Throughout  December
     2004,  more than  50 oncology  sites  were  enrolled  in the  program. Data
     regarding both  the  use of  QUADRAMET  and best  practices  in  bone  pain
     management will be collected from more than 500 patients.  Results  of this
     initiative  are expected to be presented at key medical meetings  following
     the conclusion of the  initial  phase of this  program in  mid-2005.
  o  Researchers from several institutions presented new clinical data regarding
     QUADRAMET's  potential  role as a  targeted  oncology  product  in  various
     settings,  including both higher dose  applications and  combinations  with
     chemotherapeutics,   bisphosphonates,  and  other  potentially  synergistic
     agents at the  American  Society of Clinical  Oncology,  Society of Nuclear
     Medicine,  International Society of Pediatric Oncology, and Prostate Cancer
     Foundation  annual  meetings.
  o  Initiation of a phase I/II clinical trial under  Cytogen's  investigational
     new drug (IND)  application by researchers at The University of Texas M. D.
     Anderson  Cancer  Center  in  Houston,  Texas  to  investigate  the  use of
     QUADRAMET   in   combination   with   docetaxel    (Taxotere(R),    Aventis
     Pharmaceuticals, a member of the sanofi-aventis Group) for the treatment of
     hormone  refractory  prostate  cancer.



o    Cytogen  entered  into a  research  collaboration  with the  Institute  for
     Myeloma & Bone Cancer  Research  wherein the parties will be  investigating
     the use of  QUADRAMET  both  alone and in  combination  with  other  active
     therapies for the treatment of multiple myeloma.

PROSTASCINT

  o  Researchers from several  institutions  presented new advances in molecular
     imaging  with   PROSTASCINT   at  the  Society  of  Nuclear   Medicine  and
     Radiological Society of North America annual meetings.
  o  Publication  of  a  study  demonstrating  improved  three-year  biochemical
     control of recurrent  prostate cancer with external beam radiation  therapy
     aided by advanced  molecular  imaging  with  PROSTASCINT.  Results from the
     study  appeared  in The  Journal  of  Nuclear  Medicine  (Jani,  AB. et al,
     "Radioimmunocintigraphy  for  Postprostatectomy  Radiotherapy:  Analysis of
     Toxicity and Biochemical Control," The Journal of Nuclear Medicine,  Volume
     45, No. 8, pp.  1315-1322).
  o  Publication of clinical data demonstrating  that  overexpression of PSMA in
     primary   prostate  cancer   correlates  with  other  adverse   traditional
     prognostic   factors  and   independently   predicts  disease   recurrence.
     Overexpression of PSMA was determined by immunohistochemical staining using
     the PROSTASCINT  monoclonal  antibody (7E11.C5) and appeared in the medical
     journal Clinical Cancer Research (Ross, JS. et al,  "Correlation of primary
     tumor prostate-specific membrane antigen expression with disease recurrence
     in  prostate  cancer,"  Clinical  Cancer  Research,  Volume 9, No.  17, pp.
     6357-6362).

COMBIDEX

  o  Cytogen and Advanced Magnetics, Inc. announced the submission of a complete
     response to the  approvable  letter  received  from the U.S.  Food and Drug
     Administration (FDA) for COMBIDEX(R)  (ferumoxtran-10),  which was accepted
     by the FDA and assigned a user fee goal date of March 30, 2005. COMBIDEX is
     an  investigational  molecular  imaging  agent  consisting  of  iron  oxide
     nanoparticles for use in conjunction with magnetic resonance imaging to aid
     in the  differentiation  of cancerous and  non-cancerous  lymph nodes.  The
     FDA's Oncologic Drugs Advisory  Committee (ODAC) is scheduled to review the
     regulatory filing for COMBIDEX on March 3, 2005.

OTHER PRODUCT CANDIDATES

  o  Cytogen and Progenics  Pharmaceuticals,  Inc. announced the award of grants
     totaling  $7.4  million  over four years from the  National  Institutes  of
     Health  (NIH)  that  will be  used to  develop  novel  immunotherapies  for
     prostate  cancer based on  prostate-specific  membrane  antigen  (PSMA),  a
     promising  target highly  expressed on the surface of prostate cancer cells
     and the neovasculature of solid tumors.

OTHER HIGHLIGHTS

  o  Cytogen's  management team was strengthened with the additions of Thomas S.
     Lytle as Senior Vice President of Sales and  Marketing,  Michael J. Manyak,
     M.D., as Vice President of Medical Affairs, and William J. Thomas, Esq., as
     Senior Vice President and General Counsel.

2005 CORPORATE OBJECTIVES
- -------------------------

In 2005,  Cytogen  remains  focused on maximizing  the  commercial  potential of
QUADRAMET  and  PROSTASCINT,  as well as  advancing  our  clinical  programs and
executing our overall corporate strategy. The Company has outlined the following
corporate objectives for 2005:



  o  Expand development of QUADRAMET beyond the current palliative indication by
     advancing ongoing clinical studies and initiating new clinical programs for
     both   higher   dose   applications   and   combination   approaches   with
     chemotherapeutics,   bisphosphonates,  and  other  potentially  synergistic
     agents for the treatment of solid and hematological malignancies;
  o  Expand development of PROSTASCINT beyond the current diagnostic  indication
     by advancing  ongoing clinical studies and initiating new clinical programs
     for PROSTASCINT-guided  therapy,  monitoring response to cytotoxic therapy,
     and  imaging  other  malignancies;
  o  Develop and implement a national  PROSTASCINT  registry  designed to obtain
     data  regarding  the  potential   independent   prognostic  value  of  PSMA
     expression,  best  practices  in fusion  imaging  to detect  the extent and
     location of prostate  cancer,  and to better define the clinical utility of
     PROSTASCINT in guiding  treatment  planning and decision making;
  o  Complete  the  phase I trial  of a  recombinant  soluble  prostate-specific
     membrane   antigen  (rsPSMA)   prostate  cancer  vaccine;
  o  Advance our  development  pipeline  consisting  of  therapeutics  targeting
     prostate-specific  membrane  antigen  (PSMA),  including  the  filing of an
     Investigational New Drug application (IND); and
  o  Complete pre-launch preparations for COMBIDEX.

FINANCIAL OUTLOOK FOR 2005:

This section  provides  forward-looking  information  about Cytogen's  financial
outlook  for 2005 based  upon our  current  operations.  The  disclosure  notice
paragraph regarding  forward-looking  statements at the end of this news release
is especially applicable to this section.

Consistent  with the Company's  past  practices  for  providing  guidance when a
product candidate is undergoing FDA review, this financial guidance excludes any
revenue contribution from COMBIDEX,  but includes all COMBIDEX-related  expenses
through initial market launch.

For the year ending December 31, 2005, the Company currently expects:

  o  Total revenue of approximately $20 to $25 million;
  o  Average gross margin of approximately 40% to 50%;
  o  Selling,  general and administrative expenses totaling approximately $30 to
     $35 million; and
  o  Total internal and external joint venture research and development expenses
     of approximately $10 to $15 million.

CONFERENCE CALL & WEBCAST INFORMATION
- -------------------------------------

Cytogen will  broadcast its  quarterly  investor  conference  call live over the
Internet  today,  February  23, 2005 at 9:00 a.m.  Eastern  Standard  Time.  The
dial-in  number  for the U.S.  is  888-396-2386  and the  pass  code  number  is
29512202.  The dial-in number for international  callers is 617-847-8712 and the
pass code  number is  29512202.  This  event  can also be  accessed  by going to
Cytogen's Web site,  www.cytogen.com,  and clicking on the "Investor  Relations"
link.  A link to the webcast is under the Calendar of Events  header.  The event
will be archived and available for replay starting  approximately one hour after
the call and continuing for 7 days thereafter. The replay dial-in number for the
U.S.  is  888-286-8010  and the  dial-in  number  for  international  callers is
617-801-6888. The replay pass code number is 14815746.

NOTE:
- -----

QUADRAMET  is  indicated  for the  relief  of pain in  patients  with  confirmed
osteoblastic  metastatic  bone lesions that enhance on  radionuclide  bone scan.
This  press  release  describes  clinical  applications  that  differ  from that
reported in the QUADRAMET package insert.



PROSTASCINT  is  indicated  as a  diagnostic  imaging  agent in newly  diagnosed
patients with biopsy-proven  prostate cancer, thought to be clinically localized
after standard diagnostic  evaluation and who are thought to be at high risk for
pelvic  lymph node  metastases.  PROSTASCINT  is also  indicated as a diagnostic
imaging agent in post-prostatectomy patients with a rising PSA and a negative or
equivocal  standard  metastatic  evaluation  in whom  there  is a high  clinical
suspicion of occult metastatic  disease.  This press release describes  clinical
applications  and imaging  performance  that differs  from that  reported in the
PROSTASCINT package insert.

A copy of the full prescribing  information for QUADRAMET and PROSTASCINT may be
obtained in the U.S. from Cytogen  Corporation by calling toll free 800-833-3533
or by visiting the web site at www.cytogen.com,  which is not part of this press
release.

ABOUT CYTOGEN CORPORATION
- -------------------------

Founded  in 1980,  Cytogen  Corporation  of  Princeton,  NJ is a  product-driven
biopharmaceutical  company that develops and commercializes innovative molecules
that can be used to build leading franchises across multiple markets.  Cytogen's
marketed products include  QUADRAMET(R)  (samarium Sm-153 lexidronam  injection)
and PROSTASCINT(R) (capromab pendetide) kit for the preparation of Indium In-111
capromab  pendetide  in the United  States.  Cytogen also has  exclusive  United
States marketing rights to COMBIDEX(R)  (ferumoxtran-10)  for all  applications,
and the exclusive right to market and sell  ferumoxytol  (previously  Code 7228)
for oncology  applications in the United States.  COMBIDEX,  an  investigational
molecular  imaging agent  consisting of iron oxide  nanoparticles,  is currently
being developed for use in conjunction with magnetic resonance imaging to aid in
the  differentiation  of cancerous and  non-cancerous  lymph nodes, and is under
review by the U.S. Food and Drug Administration.  Cytogen's development pipeline
consists of therapeutics targeting  prostate-specific membrane antigen (PSMA), a
protein  highly  expressed  on the  surface  of  prostate  cancer  cells and the
neovasculature of solid tumors.  Full prescribing  information for the Company's
products is available at www.cytogen.com or by calling 1-800-833-3533.  For more
information, please visit the Company's website at www.cytogen.com, which is not
part of this press release.


This press release  contains  certain  "forward-looking"  statements  within the
meaning of the Private Securities  Litigation Reform Act of 1995 and Section 21E
of the Securities Exchange Act of 1934, as amended.  All statements,  other than
statements of  historical  facts,  included in this press release  regarding our
strategy,  future operations,  financial  position,  future revenues,  projected
costs,  prospects,  plans  and  objectives  of  management  are  forward-looking
statements.  Such  forward-looking  statements  involve  a number  of risks  and
uncertainties  and investors are cautioned not to put any undue  reliance on any
forward-looking  statement.  There are a number of important  factors that could
cause  Cytogen's  results  to differ  materially  from those  indicated  by such
forward-looking  statements.  In particular,  Cytogen's business is subject to a
number of significant risks, which include,  but are not limited to: the risk of
obtaining  the  necessary  regulatory  approvals;  the risk of whether  products
result  from  development  activities;  the  risk of  shifts  in the  regulatory
environment  affecting  sales of Cytogen's  products such as  third-party  payor
reimbursement  issues;  the risk  associated  with  Cytogen's  dependence on its
partners for development of certain projects, as well as other factors expressed
from time to time in Cytogen's periodic filings with the Securities and Exchange
Commission  (the  "SEC").  As a result,  this  press  release  should be read in
conjunction with Cytogen's  periodic  filings with the SEC. The  forward-looking
statements  contained herein are made only as of the date of this press release,
and Cytogen  undertakes no obligation  to publicly  update such  forward-looking
statements to reflect subsequent events or circumstances.

                                       ###




                       CYTOGEN CORPORATION & SUBSIDIARIES
                (All amounts in thousands except per share data)
                                   (Unaudited)

                 CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS




                                       THREE MONTHS ENDED              TWELVE MONTHS ENDED
                                          DECEMBER 31,                     DECEMBER  31,
                                       ------------------              -------------------
                                      2004           2003               2004            2003
                                      ----           ----               ----            ----
                                                                            
Product Revenue:
   QUADRAMET                          $     1,899     $     1,606       $    7,293      $     2,765
   PROSTASCINT                              1,839           1,785            7,186            6,523
   Others                                       -              56                1              535
                                      -----------     -----------       ----------      -----------
         Total Product Revenue              3,738           3,447           14,480            9,823

Royalty Revenue                                 -               -                -            1,105
License and Contract Revenue *                 67              87              139            2,914
                                      -----------     -----------       ----------      -----------
         Total Revenues                     3,805           3,534           14,619           13,842
                                      -----------     -----------       ----------      -----------

Operating Expenses:
   Cost of Product Related Revenue          2,326           2,419            9,309            6,268
   Selling, General and Administrative      6,170           3,721           20,318           11,867
   Research and Development                 1,253              59            3,206            2,342
   Equity in Loss of Joint Venture            740             772            2,896            3,452
   Impairment of Intangible Asset               -               -                -              115
                                      -----------     -----------       ----------      -----------
         Total Operating Expenses          10,489           6,971           35,729           24,044
                                      -----------     -----------       ----------      -----------

Interest Income (Expense), Net                 99               4              263              (44)
Income Tax Benefit                           (307)           (304)            (307)            (888)
                                      -----------     -----------       ----------      -----------
Net Loss                              $    (6,278)    $    (3,129)      $  (20,540)     $    (9,358)
                                      ===========     ===========       ==========      ===========

Basic and Diluted Net Loss Per Share  $     (0.41)    $     (0.26)      $    (1.40)     $     (0.92)
                                      ===========     ===========       ==========      ===========

Weighted Average Common Shares
  Outstanding                              15,454          12,087           14,654           10,205
                                      ===========     ===========       ==========      ===========



* During the third quarter of 2003, the Company recorded $1.9 million in revenue
related to the  acceleration of previously  deferred  revenue as a result of the
termination   of  the  1998  license   agreement  for   QUADRAMET   with  Berlex
Laboratories.


                      CONDENSED CONSOLIDATED BALANCE SHEETS




                                                        DECEMBER 31,     DECEMBER 31,
                                                            2004             2003
                                                      ---------------   --------------
                                                                  
Assets:
  Cash, Cash Equivalents and Short-Term Investments    $     35,825     $     30,215
  Accounts Receivable, Net                                    1,406            1,445
  Inventories                                                 3,623            1,887
  Property and Equipment, Net                                   787              595
  QUADRAMET License Fee, Net                                  7,024            7,720
  Other Assets                                                1,748            1,833
                                                       ------------     ------------
        Total Assets                                   $     50,413     $     43,695
                                                       ============     ============

Liabilities and Stockholders' Equity:
  Accounts Payable and Accrued Liabilities             $      8,040     $      5,125
  Other Current Liabilities                                   2,296               76
  Long-Term Liabilities                                          47            2,454
  Stockholders' Equity                                       40,030           36,040
                                                       ------------     ------------
        Total Liabilities and Stockholders' Equity     $     50,413     $     43,695
                                                       ============     ============