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              CYTOGEN REPORTS FIRST QUARTER 2006 FINANCIAL RESULTS

       Double-digit year-over-year sales growth for both QUADRAMET(R) and
             PROSTASCINT(R) drives record quarterly product revenue.

PRINCETON,  N.J.,  (MAY 8, 2006) -- Cytogen  Corporation  (NASDAQ:  CYTO)  today
reported its  consolidated  financial  results for the first quarter ended March
31, 2006.

FIRST QUARTER FINANCIAL HIGHLIGHTS
- ----------------------------------

     o    Total  product  revenues  for the first  quarter of 2006 were a record
          $4.4  million  compared to $4.0 million in the same period in 2005 and
          $4.2 million in the fourth quarter of 2005,  representing  12% revenue
          growth year-over-year and 5% sequential growth from the fourth quarter
          of 2005.

     o    Gross margin for the first quarter of 2006 improved to 46% compared to
          39% for the same period in 2005.

     o    Cytogen  reported a net loss of $7.7  million,  or $0.34 per basic and
          diluted share in the first quarter of 2006,  compared to $6.6 million,
          or $0.43 per basic and diluted share, for the same period in 2005. The
          increase in net loss is  primarily  driven by a $1.2  million  expense
          related to the  production of clinical  materials to support  upcoming
          studies of CYT-500 (a therapeutic  radiolabeled  anti-PSMA  monoclonal
          antibody  being  developed  by  Cytogen),  a first  quarter  charge of
          $631,000  related to the  increase  in the fair  value of the  warrant
          liability, and the recognition of $462,000 of share-based compensation
          expenses  for the first  quarter of 2006 for  options  and  restricted
          shares  granted to  employees,  following the adoption of Statement of
          Financial  Accounting Standards No. 123(R). These costs were partially
          offset by lower selling, general, and administrative expenses.

"We have entered  2006 with  continuing  success in all areas of our  business,"
stated  Michael  D.  Becker,  president  and chief  executive  officer.  "From a
commercial  perspective,  we continue to develop the  infrastructure and product
pipeline  that  we  believe  is  necessary  to  build a  long-term,  sustainable
business.  We are encouraged by QUADRAMET(R) and PROSTASCINT(R) sales trends and
look forward to the introduction of  SOLTAMOX(TM),  which is expected during the
third quarter of this year.  Our  investment in R&D is on track and reflects our
commitment to the  expansion of our product  pipeline.  In this regard,  ongoing
studies to  demonstrate  the  therapeutic  potential of QUADRAMET in combination
with various  synergistic agents are all proceeding on schedule.  Further,  with
our therapeutic  CYT-500 clinical program targeting  prostate-specific  membrane
antigen (PSMA) and numerous  PROSTASCINT  studies,  Cytogen remains a pioneer in
PSMA-related research and development."

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

QUADRAMET

QUADRAMET is Cytogen's flagship product for the relief of pain due to metastatic
bone disease arising from prostate,  breast, multiple myeloma and other types of
cancer.  Sales of QUADRAMET were a record $2.3





million for the quarter  ended March 31, 2006  compared to $2.1  million for the
same period in 2005, representing 10% revenue growth year-over-year.

PROSTASCINT

Sales  of   PROSTASCINT   kits,  the  first  and  only   commercial   monoclonal
antibody-based  agent  that  targets  PSMA to image  the  extent  and  spread of
prostate cancer, were $2.2 million for the quarter ended March 31, 2006 compared
to $1.9  million in the same period of 2005,  representing  15%  revenue  growth
year-over-year.

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

Total operating expenses for the quarter ended March 31, 2006 were $11.8 million
compared to $10.7 million for the same period in 2005.

COST OF PRODUCT REVENUE

Cost of product  revenue for each of the quarters  ended March 31, 2006 and 2005
were $2.4 million and primarily reflect QUADRAMET and PROSTASCINT  manufacturing
costs,  sales-based  royalties  paid by  Cytogen,  and the  amortization  of the
up-front  payment  to  Berlex  in 2003 to  reacquire  the  marketing  rights  to
QUADRAMET.

SG&A EXPENSES

Selling,  general and  administrative  expenses for the quarter  ended March 31,
2006 were $6.2 million compared to $7.0 million for the same period in 2005.

R&D SPENDING

Research and development expenses for the quarter ended March 31, 2006 were $3.0
million  compared  to  $739,000  for the same  period in 2005.  The  increase in
research  and  development   expenses  is  primarily   driven  by  new  clinical
development  initiatives  for both QUADRAMET and  PROSTASCINT,  and  preclinical
development expenses associated with CYT-500. Total preclinical expenses related
to CYT-500 of $1.6 million  include $1.2 million  related to the  production  of
clinical materials to support upcoming studies of CYT-500.

"Our  Phase I  dose-finding  VELSAM  trial for  QUADRAMET  in  combination  with
bortezomib  is ahead of  schedule,  and we  expect  this  trial to  conclude  by
mid-2006 with preliminary  results available at the upcoming American Society of
Clinical Oncology (ASCO) meeting," said William  Goeckeler,  Ph.D.,  senior vice
president of  operations at Cytogen.  "We are also looking  forward to important
presentations   at  two  upcoming  major  medical   meetings   demonstrating  an
improvement in treatment  outcomes from long-term  follow-up studies of prostate
cancer patients using PROSTASCINT fusion imaging."

EQUITY IN LOSS OF JOINT VENTURE

Joint  venture  expenses  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 for the first  quarter
ended March 31, 2006 was  $133,000  compared to $498,000  for the same period in
2005.

INCREASE IN VALUE OF WARRANT LIABILITY

Cytogen's  net loss for the first  quarter  ended March 31, 2006 was  negatively
impacted due to the recognition of an increase in the value of warrant liability
related to warrants issued by Cytogen in July and August of 2005.





During the third quarter of 2005,  Cytogen  recorded the warrants as a liability
at  their  fair  value  using a  Black-Scholes  option-pricing  model  and  will
remeasure them at each reporting  period until exercised or expired.  Changes in
the fair value of the warrants are reported in the  statements  of operations as
non-operating  income or expense.  For the first  quarter  ended March 31, 2006,
Cytogen  recorded a charge of $631,000 related to the increase in the fair value
of these warrants from the previous reporting period of December 31, 2005.

INVENTORIES

Inventories  as of March 31, 2006 were $2.1 million  compared to $3.6 million as
of December 31, 2005. The decrease in inventories is due primarily to the use of
certain  raw  materials  for the  manufacturing  of clinical  materials  for the
CYT-500 therapeutic development program.

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

Cytogen's  cash and cash  equivalents  as of March 31,  2006 was  $26.1  million
compared to $30.3 million as of December 31, 2005.

RECENT DEVELOPMENTS
- -------------------

o    On February 27, 2006, Cytogen announced that positive findings from several
     clinical  studies of QUADRAMET in prostate  cancer patients with metastatic
     bone disease were  presented at the ASCO Prostate  Cancer  Symposium.  Four
     abstracts  described  the  clinical  use of  QUADRAMET  both alone and with
     chemotherapy.

o    On April 4, 2006, Cytogen announced that data from a preclinical study with
     QUADRAMET  was  presented  at the  97th  Annual  Meeting  of  the  American
     Association  for Cancer  Research  (AACR)  demonstrating  that  exposure to
     ionizing  radiation  from  QUADRAMET  increases  the  expression of surface
     molecules on cancer cells,  potentially improving the ability of the body's
     immune system to recognize and kill tumor cells.

o    On April 5, 2006, Cytogen announced that data from a preclinical study with
     QUADRAMET was presented at the 97th Annual  Meeting of the AACR  suggesting
     that a novel method of  administration  of the product may  increase  local
     targeted  exposure to the osteosarcoma  tumor in a single limb and minimize
     systemic exposure to radioactivity.

o    On April 6, 2006,  Cytogen  announced the submission of an  Investigational
     New Drug (IND) application to the U.S. Food and Drug  Administration  (FDA)
     for CYT-500,  the company's  lead  therapeutic  candidate  targeting  PSMA.
     Cytogen  today  separately  announced  that  the  FDA  cleared  the IND for
     CYT-500,  which  became  effective  30 days  after  the  company's  initial
     submission to the FDA.

o    On April 24, 2006, Cytogen announced the sale of its 50% ownership interest
     in PDC to Progenics  Pharmaceuticals,  Inc. for an up-front cash payment of
     $13.2 million,  potential  future milestone  payments  totaling up to $52.0
     million  payable  upon  regulatory  approval and  commercialization  of PDC
     products, and royalties on future PDC product sales. Under the terms of the
     sale agreement, Cytogen will no longer be responsible for funding PDC.

o    On April 24, 2006, Cytogen and Savient  Pharmaceuticals,  Inc. finalized an
     exclusive  distribution  agreement  for  SOLTAMOX  (tamoxifen  citrate),  a
     cytostatic  estrogen receptor antagonist and the first oral liquid hormonal
     therapy  approved in the U.S.  SOLTAMOX is indicated  for the  treatment of
     breast cancer in adjuvant and metastatic settings and to reduce the risk of
     breast  cancer in women with ductal  carcinoma  in situ (DCIS) or with high
     risk of breast  cancer.  Cytogen  paid an  up-front  licensing  fee of $2.0
     million  to  Savient  and may also pay  additional  contingent  sales-based
     milestone  payments  totaling up to $4.0  million to Savient and its wholly
     owned subsidiary,  Rosemont  Pharmaceuticals Ltd. Savient and Rosemont will





     also  receive  royalties on net sales of  SOLTAMOX.  Additionally,  Cytogen
     entered  into a supply  agreement  with  Rosemont for the  manufacture  and
     supply of SOLTAMOX.  Cytogen  expects to launch  SOLTAMOX  during the third
     quarter of 2006.

o    Cytogen  today  separately  announced  that it has  entered  into a royalty
     buyout  agreement with Berlex,  Inc. for QUADRAMET.  Under the terms of the
     agreement,  Cytogen will no longer pay Berlex a royalty on QUADRAMET  sales
     in exchange  for a one-time  cash payment of $6 million and the issuance of
     623,441  shares of  Cytogen  common  stock at a price of $3.21 per share to
     Berlex.  The closing of the transaction is expected within 90 days, subject
     to certain closing conditions.  As additional  consideration,  Cytogen will
     also pay Berlex one-time,  sales-based milestone payments of $3,340,000 and
     $5,010,000  the first  time net sales of  QUADRAMET  in the U.S.  territory
     reach $20 million and $30 million,  respectively,  in any 12-month  period.
     The two sales-based milestone payments will be made in four equal quarterly
     installments.

UPCOMING EVENTS
- ---------------

o    The  following  PROSTASCINT  abstract  will be  presented  at the  American
     Urological  Association  (AUA)  annual  meeting  in May  and  is  currently
     available on the AUA website at http://www.auanet.org, which is not part of
     this press release:
          o    "SPECT/CT Capromab Pendetide  Independently Predicts bDFS in Long
               Term Outcome  Study" will be presented on Wednesday,  May 24 from
               1:00  p.m.  to 3:00  p.m.  during a Podium  Session  on  Prostate
               Cancer:  Staging (II) (Abstract # 1649).
o    The  Scientific  Program  Committee of the ASCO has selected the  following
     QUADRAMET  abstract  for  presentation  at its 2006 ASCO Annual  Meeting in
     June:
          o    "Phase I study of bortezomib and 153Sm-lexidronam combination for
               refractory  and relapsed  multiple  myeloma" will be presented in
               the Lymphoma and Plasma Cell Disorders General Poster Session.
o    The following  PROSTASCINT abstracts will be presented at the 27th American
     Brachytherapy  Society Annual Meeting held May 10-12, 2006 in Philadelphia,
     PA:
          o    "The  Significant  Impact  of  PROSTASCINT  Imaging  on  Prostate
               Brachytherapy  Patient  Management"
          o    "The Impact of Capromab  Pendetide  (PROSTASCINT)  for  Treatment
               Planning  Versus  Standard  Planning  Techniques for  Biochemical
               Disease Free  Survival at 6 Years  Follow-up in a University  VS.
               Community Setting"


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

Cytogen will  broadcast its  quarterly  investor  conference  call live over the
Internet  today,  May 8, 2006 at 4:15 p.m.  Eastern  Standard  Time. The dial-in
number for the U.S. is 1-800-659-2037 and the pass code number is 83643211.  The
dial-in number for  international  callers is  1-617-614-2713  and the pass code
number is 83643211.  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 19936426.

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.

SOLTAMOX  is  indicated  for the  treatment  of breast  cancer in  adjuvant  and
metastatic  settings and to reduce the risk of breast  cancer in women with DCIS
or with high risk of breast cancer.  Use of SOLTAMOX in risk  reduction  setting
(women at high risk for  cancer  and women  with  DCIS) has been  shown to cause
cancer of the  uterus,  as well as stroke,  and blood  clots.  The  benefits  of
SOLTAMOX  outweigh  its risks in women  already  diagnosed  with breast  cancer.
SOLTAMOX   should  not  be  used  in  women  who  require   concomitant  use  of
coumarin-type anticoagulant, or in women with history of deep vein thrombosis or
pulmonary embolus.  Women who are pregnant or plan to become pregnant should not
take  SOLTAMOX.  Cataracts  and resultant  cataract  surgery can also occur more
frequently with SOLTAMOX.  The most frequently  reported adverse  reactions with
SOLTAMOX were hot flashes and vaginal discharge.

A copy of the full  prescribing  information  for  QUADRAMET,  PROSTASCINT,  and
SOLTAMOX 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  biopharmaceutical
company  dedicated to improving  the lives of patients with cancer by acquiring,
developing  and  commercializing  innovative  molecules  targeting the sites and
stages of cancer progression.  Cytogen's marketed products include  QUADRAMET(R)
(samarium Sm-153 lexidronam injection),  PROSTASCINT(R) (capromab pendetide) kit
for the  preparation  of Indium  In-111  capromab  pendetide,  and  SOLTAMOX(TM)
(tamoxifen  citrate)  in  the  United  States.  Cytogen's  development  pipeline
consists   of   CYT-500,   a   therapeutic   radiolabeled   antibody   targeting
prostate-specific  membrane  antigen (PSMA),  a protein highly  expressed on the
surface of prostate cancer cells and the neovasculature of solid tumors. 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. Full prescribing  information for the Company's products is available at
www.cytogen.com or by calling 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
                                                            MARCH 31,
                                                 -------------------------------
                                                     2006               2005
                                                 -----------        ------------
Product Revenue:
   QUADRAMET                                     $     2,256         $   2,054
   PROSTASCINT                                         2,184             1,899
                                                 -----------         ---------
       Total Product Revenue                           4,440             3,953


License and Contract Revenue                               2                41
                                                 -----------         ---------
       Total Revenues                                  4,442             3,994
                                                 -----------         ---------

Operating Expenses:
   Cost of Product Revenue                             2,416             2,427
   Selling, General and Administrative                 6,237             7,024
   Research and Development                            2,982               739
   Equity in Loss of Joint Venture                       133               498
                                                 -----------         ---------
       Total Operating Expenses                       11,768            10,688
                                                 -----------         ---------

Interest Income, Net                                     291               101
Increase in Value of Warrant Liability*                 (631)                -
                                                 -----------         ---------
Net Loss                                         $    (7,666)        $  (6,593)
                                                 ===========         =========

Basic and Diluted Net Loss Per Share             $     (0.34)        $   (0.43)
                                                 ===========         =========

Weighted Average Common Shares Outstanding            22,474            15,513
                                                 ===========         =========

*Reflects a mark-to-market increase of $631 for the three months ended March 31,
2006 in the value of the warrant  liability  related to warrants  issued in July
and August 2005.


                      CONDENSED CONSOLIDATED BALANCE SHEETS




                                                                         MARCH 31,     DECEMBER 31,
                                                                           2006            2005
                                                                     --------------   -------------
                                                                                  
Assets:
      Cash, Cash Equivalents and Short-Term Investments               $     26,112      $   30,337
      Accounts Receivable, Net                                               1,944           1,743
      Inventories                                                            2,089           3,582
      Property and Equipment, Net                                              916             886
      QUADRAMET License Fee, Net                                             6,153           6,327
      Other Assets                                                           1,622           1,915
                                                                       -----------      ----------
            Total Assets                                               $    38,836      $   44,790
                                                                       ===========      ==========

Liabilities and Stockholders' Equity:
      Accounts Payable and Accrued Liabilities                         $     5,716      $    5,271
      Other Current Liabilities                                                 52              26
      Warrant Liability                                                      2,500           1,869
      Other Long-Term Liabilities                                               98              46
      Stockholders' Equity                                                  30,470          37,578
                                                                       -----------      ----------
            Total Liabilities and Stockholders' Equity                 $    38,836      $   44,790
                                                                       ===========      ==========