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MEDIA/INVESTORS CONTACT:
Jonathan Fassberg
The Trout Group
(212) 477-9007 x16

       CYTOGEN REPORTS FOURTH QUARTER AND FULL YEAR 2005 FINANCIAL RESULTS


PRINCETON, N.J., (FEBRUARY 23, 2006) -- Cytogen Corporation (NASDAQ: CYTO) today
reported its consolidated financial results for the fourth quarter and full year
ended December 31, 2005.

HIGHLIGHTS
- ----------

o    Total  product  sales for the  fourth  quarter  of 2005  were $4.2  million
     compared to $3.7 million in the fourth quarter of 2004 and $3.5 million for
     the third quarter of 2005,  representing 13% revenue growth  year-over-year
     and 20% sequential growth from the third quarter of 2005.

o    For the year ended  December 31, 2005,  total  product  sales were a record
     $15.8  million  compared  to  $14.5  million  in the same  period  of 2004,
     representing  an increase of 9% over the prior year.  The growth in product
     sales  during  this  period  was  driven  primarily  by a 14%  increase  in
     QUADRAMET product sales.

o    Gross margin for the year ended  December 31, 2005 improved to 39% compared
     to 36% for the same period in 2004.

o    Cytogen reported a net loss of $4.8 million, or $0.25 per basic and diluted
     share,  for the fourth  quarter of 2005 compared to $6.3 million,  or $0.41
     per basic and  diluted  share,  for the same  period in 2004.  For the year
     ended  December 31, 2005,  total net loss was $26.3  million,  or $1.54 per
     basic and diluted share,  compared to $20.5 million, or $1.40 per basic and
     diluted share, in the same period of 2004.

o    Cytogen's cash, cash equivalents and short-term  investments  balance as of
     December  31,  2005 was  $30.3  million  compared  to $35.8  million  as of
     December 31, 2004.

o    More than a dozen  clinical  trials are  currently  underway  to expand the
     potential  use of QUADRAMET  and  PROSTASCINT  in treating  and  diagnosing
     various cancers.

"The  expansion  and  refocusing  of our  commercial  and  clinical  development
activities  during the past year helped  lead to record  product  sales,  driven
primarily by our success with QUADRAMET," said Michael D. Becker,  President and
Chief  Executive  Officer of Cytogen.  "We believe our  oncology  portfolio  and
product  revenues  will  continue  to grow in 2006 and beyond as we  continue to
advance more than a dozen  clinical  development  programs for our two currently
marketed products. We will also prepare to launch SOLTAMOX(TM) for the treatment
of breast cancer  shortly after the execution of our  definitive  agreement with
Savient  Pharmaceuticals.  Lastly,  we are on  track to  submit  the IND for our
radiolabeled 7E11 antibody for the treatment of prostate cancer during the first
quarter."





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 $2.2 million for the quarter ended December 31,
2005  compared to $1.9  million for the same period in 2004.  For the year ended
December 31, 2005, sales of QUADRAMET were $8.4 million compared to $7.3 million
in the same period of 2004.

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 $2.1  million for the quarter  ended  December 31, 2005,
compared to $1.8 million in the same period of 2004. For the year ended December
31, 2005, sales of PROSTASCINT were $7.4 million compared to $7.2 million in the
same period of 2004.

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

TOTAL OPERATING EXPENSES

Total  operating  expenses for each of the quarters  ended December 31, 2005 and
2004 were $10.5 million.  For the year ended December 31, 2005,  total operating
expenses  were $44.8  million  compared  to $35.7  million in the same period of
2004.

COST OF PRODUCT REVENUE

Cost of product  revenue was $2.6  million for the quarter  ended  December  31,
2005,  compared to $2.3  million in the same period of 2004.  For the year ended
December 31,  2005,  cost of product  revenue was $9.6 million  compared to $9.3
million in the same period of 2004. Cost of product revenue  primarily  reflects
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 December 31,
2005 were $5.4 million compared to $6.2 million for the same period in 2004. For
the year ended  December 31, 2005,  total  selling,  general and  administrative
expenses  were $25.9  million  compared  to $20.3  million in the same period of
2004.  The  year-over-year  increase  in  selling,  general  and  administrative
expenses was primarily driven by expanded  investment for the commercial support
of both QUADRAMET and PROSTASCINT, including the implementation of new marketing
initiatives and expansion of the Company's sales force,  which was substantially
completed in January 2005.

R&D EXPENSES

Research and  development  expenses for the quarter ended December 31, 2005 were
$2.2 million  compared to $1.3 million for the same period in 2004. For the year
ended  December 31, 2005,  total  research and  development  expenses  were $6.1
million  compared to $3.2  million for the same period of 2004.  The increase in
research  and  development   expenses  is  primarily   driven  by  new  clinical
development initiatives for both QUADRAMET and PROSTASCINT and a $500,000 charge
in the second quarter of 2005 for a non-cash  milestone  payment  related to the
progress of PSMA  development  programs.  In addition,  research and development
expenses include  preclinical  development  costs associated with a radiolabeled
murine anti-PSMA





monoclonal  antibody  (7E11.C5.3)  being  developed  by Cytogen,  initially as a
treatment for metastatic hormone refractory prostate cancer.

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  quarter  ended
December 31, 2005 was $0.3 million  compared to $0.7 million for the same period
of 2004. For the year ended December 31, 2005,  Cytogen's share of the equity in
the loss of PDC was $3.2 million compared to $2.9 million for the same period in
2004.  The equity in the loss of the joint  venture for the year ended  December
31, 2005 includes  Cytogen's  share of the $2.0 million up-front fee incurred in
the second quarter of 2005 by PDC to license proprietary antibody-drug conjugate
(ADC)  technology  from Seattle  Genetics,  Inc.  for use with PDC's  antibodies
targeting PSMA, as previously announced in June 2005.

DECREASE IN VALUE OF WARRANT LIABILITY

Cytogen's  net loss  for the  quarter  and  year  ended  December  31,  2005 was
positively  impacted  due to the  recognition  of a decrease in the value of the
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 quarter and year ended December 31,
2005,  Cytogen  recorded a gain of $1.0 million and $1.7 million,  respectively,
related to the  decrease  in the fair value of these  warrants  from  either the
previous reporting period or their respective issuance dates.

INVENTORIES
- -----------

Inventories  were  $3.6  million  as of both  December  31,  2005 and  2004.  In
September 2004, Cytogen entered into an agreement with Laureate Pharma,  Inc. to
manufacture  PROSTASCINT for Cytogen.  Cytogen  believes that the agreement will
provide a sufficient  supply of PROSTASCINT to satisfy  commercial  requirements
for  approximately  the next three to four years based upon recent sales levels.
In addition,  Cytogen believes that the agreement will provide sufficient supply
of the 7E11.C5.3 monoclonal antibody required for the company's initial clinical
development activities for its therapeutic Lu-177 labeled 7E11 program.

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

Cytogen's  cash,  cash  equivalents  and  short-term  investments  balance as of
December 31, 2005 was $30.3 million compared to $35.8 million as of December 31,
2004. The December 31, 2005 balance reflects the receipt of approximately  $12.6
million  in net  proceeds  from the  December  2005  sale of  common  stock  and
warrants.

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

o    On February 8, 2006,  Cytogen and  Savient  Pharmaceuticals  announced  the
     execution of a binding letter of intent to negotiate a definitive agreement
     granting Cytogen  exclusive  marketing  rights for SOLTAMOX(TM)  (tamoxifen
     citrate) in the United States.  SOLTAMOX,  a cytostatic  estrogen  receptor
     antagonist,  is the first oral liquid hormonal therapy approved in the U.S.
     and 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.
o    On  January  24,  2006,  Cytogen  announced  the  publication  of data from
     preclinical  studies  involving the use of QUADRAMET  both as a monotherapy
     and in combination with the proteasome inhibitor





     bortezomib  (Velcade(R),  Millennium  Pharmaceuticals,  Inc.)  in a  murine
     myeloma model. These studies  demonstrated  significantly  prolonged median
     survival,  rapidly  reduced  clonogenicity  of  bone-marrow  resident 5TGM1
     cells, slowed elevation of serum myeloma-associated paraprotein levels, and
     longer-term preservation of bone mineral density.
o    On December 13, 2005,  Cytogen  announced  that the company  entered into a
     securities purchase agreement with certain institutional investors to raise
     $12.6  million  in net  proceeds  through  the  sale of  common  stock  and
     warrants.  The transaction closed on December 14, 2005 and Rodman & Renshaw
     acted as placement  agent.
o    On December 12, 2005,  Cytogen  announced the  presentation  of preclinical
     data for  QUADRAMET in  combination  with  bortezomib.  The  findings  were
     presented  during the  American  Society of  Hematology  (ASH) 47th  Annual
     Meeting.
o    On November 28, 2005, Cytogen announced initiation of a multicenter Phase I
     clinical  trial to  investigate  the use of QUADRAMET in  combination  with
     bortezomib  for the treatment of multiple  myeloma.  The clinical  study is
     designed  to evaluate  the safety  profile and  preliminary  incidence  and
     duration of clinical  benefits of bortezomib in combination with QUADRAMET.
o    On  November  15,  2005,   Cytogen   announced  that  an  abstract   titled
     "Development   of  Optimal  Lu-177  Labeled   Monoclonal   Antibody  (7E11)
     Constructs for  Radioimmunotherapy of Prostate Cancer" was presented at the
     AACR-NCI-EORTC  International  Conference  on Molecular  Targets and Cancer
     Therapeutics:  Discovery,  Biology, and Clinical Applications,  the premier
     international   meeting  featuring  novel  cancer  therapeutics,   held  in
     Philadelphia, PA.

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

Cytogen will  broadcast its  quarterly  investor  conference  call live over the
Internet today, February 23, 2006, beginning at 9:00 a.m. Eastern Standard Time.
The  dial-in  number for the U.S.  is  866-383-8008  and the pass code number is
86406174.  The dial-in number for international  callers is 617-597-5341 and the
pass code  number is  86406174.  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 seven 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 30145799.

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,
including  warnings,  precautions,  adverse events and other safety information,
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
- -------------------------

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)  and  PROSTASCINT(R)  (capromab  pendetide)  kit  for the
preparation of Indium In-111  capromab  pendetide in the United States.  Cytogen
also has exclusive U.S. 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. 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  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
successfully  consummating the strategic  relationship with Savient; the risk of
obtaining  additional  capital;  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;
the risks associated with Cytogen's  strategic  relationships,  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                    YEAR  ENDED
                                                       DECEMBER  31,                     DECEMBER  31,
                                                    ------------------                 -------------------
                                                    2005          2004                 2005           2004
                                                  ---------    ----------            ----------     --------

                                                                                        
Product Revenue:

     QUADRAMET                                    $   2,152    $    1,899            $    8,350     $  7,293
     PROSTASCINT                                      2,059         1,839                 7,407        7,186
     Others                                               -             -                     -            1
                                                  ---------    ----------            ----------     --------
           Total Product Revenue                      4,211         3,738                15,757       14,480

License and Contract Revenue                             34            67                   189          139
                                                  ---------    ----------            ----------     --------
           Total Revenues                             4,245         3,805                15,946       14,619
                                                  ---------    ----------            ----------     --------

Operating Expenses:
     Cost of Product Revenue                          2,557         2,326                 9,621        9,309
     Selling, General and Administrative              5,439         6,170                25,895       20,318
     Research and Development                         2,217         1,253                 6,064        3,206
     Equity in Loss of Joint Venture                    296           740                 3,175        2,896
                                                  ---------    ----------            ----------     --------
           Total Operating Expenses                  10,509        10,489                44,755       35,729
                                                  ---------    ----------            ----------     --------

Interest Income, Net                                   211             99                   598          263
Decrease in Value of Warrant Liability *               963              -                 1,666            -
Income Tax Benefit                                    (256)          (307)                 (256)        (307)
                                                  --------     ----------            ----------     --------


Net Loss                                          $ (4,834)    $   (6,278)           $  (26,289)    $(20,540)
                                                  ========     ==========            ==========     ========

Basic and Diluted Net Loss Per Share              $  (0.25)    $    (0.41)           $    (1.54)    $  (1.40)
                                                  ========     ==========            ==========     ========

Weighted Average Common Shares Outstanding          19,466         15,454                17,117       14,654
                                                  ========     ==========            ==========     ========


* Reflects a mark-to-market decrease of $963 and $1,666 for the three and twelve
month  periods  ended  December 31, 2005  respectively,  on the value of warrant
liability related to warrants issued in July and August of 2005.


                      CONDENSED CONSOLIDATED BALANCE SHEETS




                                                                             DECEMBER 31,     DECEMBER 31,
                                                                                2005              2004
                                                                          ----------------   ---------------

                                                                                        
Assets:
      Cash, Cash Equivalents and Short-Term Investments                     $     30,337      $     35,825
      Accounts Receivable, Net                                                     1,743             1,406
      Inventories                                                                  3,582             3,623
      Property and Equipment, Net                                                    886               787
      QUADRAMET License Fee, Net                                                   6,327             7,024
      Other Assets                                                                 1,915             1,748
                                                                            ------------      ------------
              Total Assets                                                  $     44,790      $     50,413
                                                                            ============      ============

Liabilities and Stockholders' Equity:
      Accounts Payable and Accrued Liabilities                              $      5,271      $      7,644
      Other Current Liabilities                                                       26             2,692
      Warrant Liability                                                            1,869                 -
      Other Long-Term Liabilities                                                     46                47
      Stockholders' Equity                                                        37,578            40,030
                                                                            ------------      ------------
              Total Liabilities and Stockholders' Equity                    $     44,790      $     50,413
                                                                            ============      ============