CYTOGEN CORP
424B3, 1999-08-12
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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                        Filed Pursuant to Rule 424(b)(3)

PROSPECTUS
                                     Shares
                               CYTOGEN CORPORATION
                                  Common Stock

     This  prospectus  relates to the sale by CYTOGEN  Corporation  of 3,105,590
shares  of our  common  stock.  We plan to offer  these  shares  to The State of
Wisconsin Investment Board (the "Principal Offeree").

         Our common  stock is listed on the Nasdaq Stock Market under the symbol
"CYTO."  The last sales  price of our common  stock as reported by the Nasdaq on
July 16, 1999 was $1.813 per share.

         Investing  in  the  common  stock  involves  certain  risks  which  are
described in the "Risk Factors" section beginning on page 6 of this prospectus.

         The  information in this prospectus is not complete and may be changed.
We may not sell these securities until the registration statement filed with the
Securities and Exchange Commission is effective. This prospectus is not an offer
to  sell  these  securities  and it is not  soliciting  an  offer  to buy  these
securities in any state where the offer or sale is not permitted.

         Neither the Securities and Exchange Commission nor any state securities
commission  has approved or disapproved  these  securities or determined if this
prospectus  is truthful or  complete.  Any  representation  to the contrary is a
criminal offense.


- --------------------------------------------------------------------------------
                                            Per Share                Total
- --------------------------------------------------------------------------------
Price to Offerree ....................        $1.61(1)               $5,000,000

Proceeds to the Company ..............        $1.61                  $5,000,000

(1) The  offering  was priced at a discount of 7.25% from the  average  closing
price of $1.74 per share over a five day trading period proceeding the offering.
- --------------------------------------------------------------------------------


     CYTOGEN's principal executive offices are located at 600 College Road East,
CN 5308, Princeton, New Jersey 08540-5308, (609) 750-8200.





August 4, 1999

<PAGE>






                                TABLE OF CONTENTS

                                                                           Page
Prospectus Summary......................................................    3
Risk Factors............................................................    6
Price Range of Our Common Stock.........................................   19
Dividend Policy.........................................................   19
Use of Proceeds.........................................................   19
Where You Can Find More Information.....................................   20
Plan of Distribution....................................................   21
Legal Matters...........................................................   22
Experts.................................................................   22

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










     ProstaScint  and OncoScint are registered  trademarks of CYTOGEN.  PIE is a
trademark  of CYTOGEN,  pending  registration.  Quadramet is a trademark of Dow,
licensed to CYTOGEN.


                                       2
<PAGE>



                               PROSPECTUS SUMMARY

     This summary highlights information contained elsewhere in this prospectus.
It is not  complete  and may not  contain  all the  information  that you should
consider  before  investing  in the common  stock.  You  should  read the entire
prospectus carefully, including the "Risk Factors" section.

The Company

     CYTOGEN  Corporation  ("CYTOGEN" or the  "Company") is a  biopharmaceutical
company engaged in the development,  commercialization and marketing of products
to improve  diagnosis and treatment of prostate  disease,  of products for unmet
needs in the broader  urological and oncology markets.  CYTOGEN was incorporated
in Delaware in 1981. Unless the context otherwise indicates, as used herein, the
term "Company" refers to CYTOGEN and its subsidiaries, taken as a whole.

Our Products

     We introduced to the market during 1997 our two principal products, each of
which have been approved by the U.S. Food and Drug Administration ("FDA"):

     -    ProstaScint(R)  (kit for the  preparation  of  Indium  In111  Capromab
          Pendetide).

               ProstaScint  has been approved as a diagnostic  imaging agent for
               prostate  cancer,  the most frequently  diagnosed  malignancy and
               second  leading  cause of  cancer  death in men.

     -   Quadramet(R) Samarium  Sm153  Lexidronam   Injection).

               Quadramet has been approved for the treatment of bone pain due to
               cancers  that  have  spread  to  the  skeleton  and  that  can be
               visualized on a bone scan.

     Our  OncoScint(R)  CR/OV  imaging  agent is also approved and marketed as a
diagnostic imaging agent for colorectal and ovarian cancer.

     We believe  that our  products  represent a  significant  improvement  over
existing   technologies   because  our  products  provide  improved   diagnostic
information  and/or  treatment in a  site-specific  manner with  relatively  low
levels of toxicity.

     We also develop other products and technologies,  both directly and through
subsidiaries, and have engaged in development efforts with other parties.

     Our primary products in development are:

          - Vaccines for  prostate and other  cancers  utilizing  the  Company's
          proprietary  prostate  specific  membrane  technology,  or PSMA,  in a
          collaboration with Progenics Pharmaceuticals, Inc.;

          - Other potential diagnostic and therapeutic applications of PSMA; and

          - A  bioinformatics  platform  designed  to offer a  database  mapping
          interaction  between proteins to be accessed by a computer program for
          use in drug discovery and research.

Research and Development

     Historically,  we have emphasized research and development of a broad array
of potential  products,  based on monoclonal  antibodies and other technologies.
Having identified and commercialized  products which we believe have substantial
potential, we have:

                                        3

<PAGE>

          -  Conducted  or  sponsored  clinical  studies  to  evaluate  existing
          products  in  additional  indications;

          - Focused  on  development  of  technology  with near term  commercial
          significance; o Reviewed all current research and development programs
          to assess their commercial  potential;  and

          - Recently curtailed basic research  expenditures in order to allocate
          resources toward implementing our business strategy.

Business Strategy

     Our business strategy is directed  primarily toward prostate and urological
diseases and, when opportunities  arise, in the broader field of oncology and in
diagnostics.  We plan to focus our efforts in areas in which we have experience.
Our approach calls for:

          - Devoting our primary  efforts to the  marketing of  ProstaScint  and
          Quadramet to increase revenue and achieve profitability;

          - Expanding  the use of  ProstaScint  and other  products into foreign
          markets;

          - Developing products utilizing our proprietary technology;

          -  Expanding  our current  product  portfolio  through  the  continued
          in-licensing of additional products and related  technologies,  in the
          same manner as Quadramet;

          - Establishing strategic alliances;

          - Acquiring  other companies with related or  complementary  products,
          technologies and/or services.

     We cannot predict,  however,  whether we can accomplish these objectives or
whether  accomplishment of these objectives will lead to new commercially viable
products or  technologies.  In  addition,  our efforts to develop or acquire new
products depend on our available  resources,  our ability to commit resources to
potential  products or strategic  activities  without unduly  impacting  current
operations or financial results,  and whether or not such activities in the near
term would affect the  marketing of our products or the efforts of management to
commercialize the Company successfully.

Restructuring Activities

     During 1998 and early 1999,  we reviewed our assets and business  prospects
to determine  which  projects  demonstrated  adequate  potential for a continued
investment of corporate resources.  As a result of this review, we:

          - Terminated our ALT program.
               Our subsidiary  Cellcor,  Inc.  ("Cellcor")  had been  developing
               Autologous  Lymphocyte  Therapy  ("ALT")  for  the  treatment  of
               metastatic  renal cell  carcinoma  ("mRCC"),  a life  threatening
               kidney cancer for which there are no adequate  therapies.  We had
               planned  to  submit  a  Biologics  License  Application  for ALT.
               Cellcor  completed  pivotal  Phase III clinical  trials of ALT in
               mRCC patients in January 1997. Although we believe the results of
               the trials are  favorable,  ALT was not considered a priority for
               allocation of available resources.  We halted our preparation for
               submission of the Biologics  License  Application  and closed our
               Cellcor facility in September 1998.

          - Sold our interest in Targon Corporation.
               Our review  determined  that the projects  under  development  by
               Targon  Corporation  ("Targon")  were  not  consistent  with  our
               corporate strategies. During August 1998, we sold our interest in
               Targon  to our  partner  in the  venture,  Elan  Corporation  plc

                                       4
<PAGE>
               ("Elan")  for $2 million in cash.  In  addition,  we  received $2
               million from Elan in exchange for a convertible  promissory note.


          - Sold our manufacturing facility.
               We determined  that  outsourcing  manufacturing  of the Company's
               products  would  be  more  economical  and  consistent  with  our
               strategies. During early January, 1999, we sold our manufacturing
               facility to Bard Bio Pharma  L.P., a  subsidiary  of Norwalk,  CT
               based pharmaceutical  company Purdue Pharma L.P. We received $3.9
               million in cash for the assets in the facility,  and the lease to
               the  building.  We also signed an agreement  with Purdue to share
               space in the building to continue to manufacture  our ProstaScint
               and OncoScint  products at the same location.  Employees involved
               in manufacturing  currently remain CYTOGEN employees,  but Purdue
               will pay for their labor costs  except  while they are working on
               our products.

          - Reduced expenses.
               We have  downsized the workforce by eliminating  positions  which
               were no longer critical to our strategic plans and have curtailed
               expenses for basic research.


Recent Developments

     On June 15,  1999,  we  reacquired  the rights  for  immune  therapy to our
prostate specific membrane antigen ("PSMA")  technology by acquiring  Prostagen,
Inc.,  which had sublicensed  PSMA from us for prostate cancer immune therapy in
1996. We also acquired other assets held by Prostagen,  including  approximately
$550,000 in cash, a minority ownership in Northwest Biotherapeutics, Inc., which
is  developing  PSMA for cell  therapy,  and a contract  with  Velos,  Inc.  for
marketing a cancer patient software  management program for hospitals and health
care payors.  In  exchange,  we issued 2.5 million  shares of our common  stock,
valued at $1.00 per share, and will issue up to an additional $4.5 million worth
of our common stock (valued at the time of issuance) if milestones  are achieved
in the PSMA development program.

     On  June  15,  1999,  we  also  entered  a  joint  venture  with  Progenics
Pharmaceuticals,  Inc. to develop PSMA for immune  therapy,  emphasizing  cancer
vaccines  for prostate and  possibly  other  cancers.  The project will be owned
equally by us and Progenics.  Progenics will fund development through the filing
of an  Investigational  New  Drug  Application  with  the  U.S.  Food  and  Drug
Administration.  We believe this first step will last  approximately  two years.
After and if that step is achieved successfully, we and Progenics will share the
costs of clinical trials. We will have exclusive North American marketing rights
on products developed by the venture. We will receive $2 million in payments for
licensing  this  technology  to the venture.  $500,000 has been received and the
balance will be paid in installments  through December 31, 2001. We can not give
any assurance  that this program will result in products  reaching the market or
being successful.

     In June of 1999,  we  reacquired  rights to our  ProstaScint  and OncoScint
products in Canada,  which had been licensed to Faulding (Canada),  Inc. We also
agreed with Berlex Laboratories,  Inc., the North American marketing partner for
our Quadramet product,  that we would market Quadramet in Canada. We did not pay
for either of these  agreements.  OncoScint  and  Quadramet  are approved by the
Canadian Health Care Branch;  ProstaScint is under expedited  review. We believe
these  products may be marketed to major  cancer  centers in Canada and will not
require the same level of resources as for U. S. marketing.  However, we can not
be certain that ProstaScint will be approved in Canada, that these products will
be  reimbursable  under the Canadian  health care  system,  or that they will be
accepted by physicians.



                                       5
<PAGE>

                                  RISK FACTORS


     Prospective  investors in the common stock offered hereby should  carefully
consider  the  following  risk  factors,  in addition  to the other  information
contained  in  this  prospectus.   This  prospectus   contains   forward-looking
statements  which  involve  risks and  uncertainties.  Our actual  results could
differ materially from those anticipated in these forward-looking  statements as
a result of certain  factors,  including  those set forth in the following  risk
factors and elsewhere in this prospectus.

History of Operating Losses and Accumulated Deficit

         We have a history of operating losses as follows:

                                             Operating      Net Profit (Loss) to
                                               Losses       Common Stockholders
         Three months
         ended March 31, 1999              ($ 1,694,000)          $ 1,657,000

         Year Ended December 31, 1998     ($ 15,915,000)        ($ 13,271,000)

         Year Ended December 31, 1997     ($ 31,027,000)        ($ 32,064,000)


     The  operating  losses were due in part to limited  revenues and to various
expenditures, including:

          -  Research and development activities;
          -  Acquiring of complementary products and technologies;
          -  Seeking regulatory approvals for our products;
          -  Preclinical and clinical studies related to our products;
          -  Preparing of submissions to the United States Food and Drug
             Administration;
          -  Developing of sales,  marketing,  manufacturing  and  distribution
             channels;
          -  Developing of internal manufacturing capabilities relating to
             ProstaScint; and
          -  General and administrative expenses.

     We expect to incur operating losses in the future due primarily to:

          -  Continuing product development;
          -  Acquiring, developing and commercializing complementary products
             and technologies; and
          -  Expansion of our sales and marketing activities.

     As of March 31, 1999, we had an accumulated  deficit of approximately  $300
million.

                                       6
<PAGE>

Uncertainty of Profitability

     Our ability to achieve and maintain  profitability is highly dependent upon
the  successful  commercialization  of our  products,  including  Quadramet  and
ProstaScint.  Our  profitability  may also depend on success  with PSMA and with
AxCell  Biosciences.  There  can be no  assurance  that we will  ever be able to
successfully   commercialize   our   products  or  that  we  will  ever  achieve
profitability.

Fluctuating Results of Operations

     Our results of operations  have fluctuated on an annual and quarterly basis
and may  fluctuate  significantly  from period to period in the future,  due to,
among other factors:

          -  Variations in revenue from sales of and royalties from our
             products;
          -  Timing of regulatory approvals and other regulatory announcements
             relating to our products;
          -  Variations in our  marketing,  manufacturing  and  distribution
             channels;
          -  Timing  of  the   acquisition   and  successful   integration  of
             complementary  products and technologies;
          -  Timing of new product announcements and introductions by the
             Company and its competitors, and
          -  Product obsolescence resulting from new product introductions.

     Many of these  factors,  and others  not  listed  above,  are  outside  our
control. Due to one or more of these factors, our results of operations may fall
below the  expectations  of  securities  analysts  and  investors in one or more
future quarters.  If this happens, the market price of our common stock could be
materially and adversely affected.


Need for Additional Capital

     We have incurred  negative cash flows from operations since inception,  and
have  expended,  and will need to  expend,  substantial  funds to  complete  our
planned product development efforts, including:

          -  Acquisition of products and complementary technologies;
          -  Research and development;
          -  Clinical studies and regulatory activities; and
          -  Expansion of our marketing, sales and distribution activities.

In addition to the above requirements, we expect that we will require additional
capital either in the form of debt or equity,  irrespective  of whether and when
we reach profitability, for the following activities:

          -  Working capital;
          -  Acquisitions of additional products and technologies; and
          -  Further product development.

                                       7

<PAGE>
     Our future  capital  requirements  and the adequacy of our available  funds
depend on numerous factors, including:

          -  Successful commercialization of our products;
          -  Acquisition of complementary products and technologies;
          -  Magnitude, scope and results of our product development efforts;
          -  Progress of preclinical studies and clinical trials;
          -  Progress of regulatory affairs activities;
          -  Costs of filing, prosecuting, defending and enforcing patent claims
             and other intellectual property rights;
          -  Competing technological and market developments; and
          -  Expansion of strategic alliances for the sale, marketing and
             distribution of our products.

     We  currently  expect  that our  existing  cash,  together  with  decreased
operating costs, and revenues generated by product sales and royalties,  and the
proceeds from this offering,  will be adequate to fund our operations into 2000.
We can not  give  assurance  that we will  not  consume  our  available  capital
resources before that time. If we experience unanticipated cash requirements, we
may require additional capital to:

          -  Fund operations;
          -  Continue research and development programs;
          -  Continue pre-clinical and clinical testing of potential products;
             or
          -  Commercialize any products that may be developed.

Possible Unavailability of Other Financing

     There can be no assurance we will be able to obtain additional financing on
acceptable  terms,  if at all. We may seek to raise  additional  capital through
public  or  private  offerings  of  equity  or  debt  or  through  collaborative
agreements,  strategic  alliances with corporate partners and others, or through
other  contractual  arrangements with third parties.  We may receive  additional
funds upon the exercise of common stock purchase warrants and stock options, but
there can be no assurance  that any warrants or stock  options will be exercised
or that the amounts  received will be sufficient to meet our capital  needs.  If
adequate  funds are not  available,  we may be required to delay,  further scale
back or eliminate one or more of our development  programs or certain aspects of
our  operations,   or  to  obtain  funds  by  entering  into  arrangements  with
collaborative  partners or others that may  require us to  relinquish  rights to
certain of our products, product candidates,  technologies or potential markets,
that we would otherwise not relinquish. If adequate funds are not available, our
business,  financial  condition and results of operations will be materially and
adversely affected.

Possible Dilution or Requirement to Comply with Covenants

     Additional   equity  financing  may  result  in  substantial   dilution  to
shareholders,  and debt financing may limit our ability to declare dividends, or
may  require us to comply  with  covenants  that would  alter the way we conduct
business.


                                       8
<PAGE>

Dependence on Market Acceptance of ProstaScint and Quadramet for Revenues

     None of our products has a significant history of revenues. ProstaScint and
Quadramet  were  introduced  to the market during the first half of 1997 and are
expected to account for a significant percentage of our product-related revenues
in the foreseeable  future. For the year ended December 31, 1998,  revenues from
ProstaScint  and  Quadramet  accounted  for  over  91%  of our  product  related
revenues.

     Because  these  products  contribute  the  majority  of our  revenues,  our
business,  financial  condition  and  results  of  operations  depend  on  their
acceptance as safe, effective and cost efficient alternatives to other available
treatment and diagnostic protocols by the medical community, including:

          -  health care providers, such as hospitals and physicians
          -  third-party payors, including Medicare, Medicaid, private insurance
             carriers and health maintenance organizations


Market Acceptance of ProstaScint

     ProstaScint is marketed in the United States by the urological  division of
C. R. Bard,  Inc.  ("BARD"),  with CYTOGEN  retaining  co-marketing  rights.  We
believe that efforts to market ProstaScint to physicians and hospitals have been
well  received,  based on  increasing  sales,  statements  by  physicians to our
employees as to the benefits of ProstaScint and  presentations on ProstaScint by
physicians at medical  association  meetings.  However,  training by physicians,
technicians  and other health care  professionals  is required before certain of
our products can be used for diagnosis or therapy.  In order to use ProstaScint,
our  customers,   including  technologists  and  physicians,  must  successfully
complete our Partners in Excellence Program ("PIE(TM)  Program"),  a proprietary
training program designed to promote the correct  acquisition and interpretation
of ProstaScint  images.  This approach is,  therefore,  technique  dependent and
requires a learning  commitment on the part of users.  There can be no assurance
that additional  physicians  will make this commitment or otherwise  accept this
product as part of their treatment practices.

     CYTOGEN has a program  dedicated to providing  information to and resolving
issues with managed care organization  ("MCOs") relating to reimbursement.  BARD
is  obligated  to market  ProstaScint  to MCOs,  but has not yet  implemented  a
significant  program in this area.  Failure to market  ProstaScint to MCOs could
hinder acceptance or reimbursement,  although we cannot quantify what impact, if
any, this marketing effort could have on sales of ProstaScint.

Market Acceptance of Quadramet

     Berlex  Laboratories,  Inc.  ("Berlex") is responsible for the marketing of
Quadramet in the United  States,  including  marketing to MCOs,  by an agreement
entered in October 1998.  Their marketing  efforts began in the first quarter of
1999.  We can not give any  assurance  that Berlex will be able to  successfully
market  Quadramet,  or that this  agreement  will be profitable for the Company.
CYTOGEN recently obtained  marketing rights to Quadramet in Canada,  but has not
yet  implemented  a  selling  program.  We can not give any  assurance  that the
product  can be  marketed  effectively  in  Canada,  or that it will  contribute
significantly to the Company's revenues.

     We have  licensed  the rights to Quadramet  from The Dow  Chemical  Company
("Dow").  Such  rights are  currently  limited to North and Latin  America  with
respect to currently approved  indications.  We also hold a license from Dow for
use of Quadramet in treatment of  refractory  rheumatoid  arthritis in North and
Latin America and in other countries,  including  European  countries and Japan.

                                       9

<PAGE>
There can be no assurance  that  Quadramet will be accepted in the United States
and Canada,  where the product is currently  approved.  We also can not give any
assurance  that  Quadramet  will be accepted  in any markets  outside the United
States and Canada, or approved for additional indications in any locations,  due
to the influence of established  medical practices and other social and economic
factors beyond our control.

     Accordingly,  there can be no assurance that  ProstaScint or Quadramet will
achieve  market  acceptance  on a  timely  basis,  or at  all.  The  failure  of
ProstaScint  or Quadramet  to achieve  market  acceptance  would have a material
adverse  effect on the Company's  business,  financial  condition and results of
operations.

Risks Relating to Potential Additional Cuts in Company Programs

     We are reviewing and prioritizing  programs,  and there can be no assurance
that  we will  not  cut  programs  to  conserve  capital.  After  reviewing  and
prioritizing our business  opportunities,  we have ceased various  developmental
and research programs,  including  submission of a Biologics License Application
for ALT. In  addition,  we have ceased basic  research in our Genetic  Diversity
Library  ("GDL")  program.  Any additional cuts would increase our dependence on
our remaining  programs,  and would  increase the risk from such programs to the
Company as a whole,  which could  materially and adversely affect our chances of
obtaining  profitability.  While  we plan to  allocate  our  resources  to those
programs  with the greatest  potential to  contribute  to a sound  financial and
operating  position,  there can be no assurance  that we will be  successful  in
doing so.

Dependence on our Collaborative Partners

     Our  success   depends  in  significant   part  upon  the  success  of  our
collaborative  partners.  We have entered into the following  agreements for the
sales,  marketing,   distribution  and  manufacture  of  our  products,  product
candidates and technologies:

          -  Sub-license  and marketing  agreement with Berlex relating
             to the  Quadramet  technology  that we have  licensed from
             Dow.  Berlex is  responsible  for  marketing,  selling and
             arranging  manufacturing  and distribution of Quadramet in
             the  United  States,   Canada,  and  Latin  America.  This
             agreement  expires on the later of  December  20,  2014 or
             upon the expiration of the patents covering Quadramet.
          -  Co-promotion   agreement   with  BARD,   granting   BARD's
             Urological   Division  the   exclusive   right  to  market
             ProstaScint to urologists; and
          -  Agreement  for  manufacture  of  Quadramet  by The  DuPont
             Pharmaceuticals Company (formerly the radiopharmaceuticals
             division of the DuPont Merck Company, "DuPont").
          -  A joint venture with Progenics Pharmaceuticals, Inc. for
             the development of PSMA for immunotherapy for prostate and
             other cancers.

Because our  collaborative  partners are  responsible  for certain of our sales,
marketing,  manufacturing  and  distribution  activities,  these  activities are
outside our direct  control.  There can be no assurance  that our partners  will
perform their  obligations  under these  arrangements  with the Company.  In the
event that our  collaborative  partners do not successfully  market and sell our
products, or breach their obligations under the above agreements, the successful
commercialization of Quadramet and ProstaScint would not be achieved or would be
delayed,  and new product  development  could be  inhibited,  which could have a
material  adverse  effect on our  business,  financial  condition and results of
operations.

                                       10
<PAGE>

     There can be no  assurance  that we will be able to maintain  our  existing
collaborative  arrangements;  if they expire or are terminated,  there can be no
assurance that they will be renewed,  or that new arrangements will be available
on acceptable terms, if at all. In addition,  there can be no assurance that any
new arrangements or renewals of existing  arrangements will be successful,  that
the parties to any new or renewed  agreements  will  perform  their  obligations
thereunder, or that any potential collaborators will not compete with us.

     There can also be no assurance  that our existing or future  collaborations
will  lead  to the  development  of  product  candidates  or  technologies  with
commercial  potential,  that we will be able to  obtain  proprietary  rights  or
licenses  for  proprietary  rights for our product  candidates  or  technologies
developed  in  connection  with these  arrangements,  or that we will be able to
ensure the  confidentiality of proprietary  rights and information  developed in
such arrangements or prevent the public disclosure thereof.

Limited Sales, Marketing and Distribution Capabilities

     We have limited internal sales, marketing and distribution capabilities. We
depend on Berlex for the sales,  marketing and  distribution of Quadramet in the
United  States,  and on BARD for the  sale  and  marketing  of  ProstaScint.  In
locations outside the United States, we have not established a selling presence.
If we are unable to establish  and maintain  significant  sales,  marketing  and
distribution  efforts,  either  internally  or through  arrangements  with third
parties,  our business,  financial  condition and results of operations could be
materially adversely effected.

We have limited marketing history for our products:

          -  ProstaScint  was  approved  for  marketing  by the  FDA in
             October 1996, and commercially  launched in February 1997.
             ProstaScint  sales have  experienced  growth since product
             launch.  However,  there  can be no  assurance  that  such
             growth will continue; and

          -  Quadramet was approved for marketing by the FDA in March 1997 and
             launched  by DuPont in June  1997.  Quadramet  sales  during  the
             period  from  initial  launch  were  below the  levels of minimum
             royalty  payments we recorded  under our  agreement  with DuPont.
             Growth  during early months was limited by the need for hospitals
             to  obtain  license  amendments  under  federal  and state law to
             receive and handle this new  radioactive  product.  In  addition,
             initial  marketing  efforts by DuPont were directed  primarily to
             nuclear medicine  physicians who directly  administer the product
             to  patients.  While we believe this  approach  was  necessary to
             generate product  understanding,  marketing to primary caregivers
             for likely  candidates  for treatment with Quadramet is necessary
             for extensive  penetration  into the market.  Berlex  maintains a
             sales force which calls on the physician  oncological  community;
             however,  there is no significant  experience  with sales efforts
             for  Quadramet  and there can be no assurance  that sales efforts
             will be successful.

     The failure of our marketing  efforts to achieve  commercial  success would
have a material adverse effect on our business and results of operations.

Risks Associated with Manufacturing;  Third-Party  Manufacturers'  Dependence on
Single Source Suppliers; Need to Comply with Manufacturing Regulations

     Our products must be manufactured  either internally or through third-party
manufacturers  in  compliance  with  regulatory  requirements  and at acceptable
costs.

                                       11

<PAGE>
     While we believe that our  manufacturing  operations  currently address our
needs for the production of our products, there can be no assurance that we will
be able to continue to  manufacture,  arrange for  manufacture on a commercially
reasonable  basis, or successfully  outsource the manufacturing of our products.
If we are unable to  successfully  manufacture or arrange for the manufacture of
our products and product candidates, there would be a material adverse effect on
our business, financial condition and results of operations.

     Quadramet is  manufactured  by DuPont  pursuant to an  agreement  with both
Berlex and CYTOGEN. Certain components of Quadramet,  particularly  Samarium-153
and EDTMP,  are  provided  to DuPont by outside  suppliers.  Due to  radioactive
decay,  Samarium-153 must be produced on a weekly basis. On one occasion, DuPont
was unable to  manufacture  Quadramet  on a timely basis due to the failure of a
supplier to provide Samarium-153.  If DuPont cannot obtain sufficient quantities
of such components on commercially  reasonable  terms, or in a timely manner, it
would be unable to manufacture  Quadramet on a timely and  cost-effective  basis
which could have a material adverse effect on our business,  financial condition
and results of operations.  Alternative  sources for these components may not be
readily  available.  If  DuPont  were to lose its  sources  of  supply  for such
components,  production of Quadramet  would be  interrupted,  which could have a
material  adverse  effect on our  business,  financial  condition and results of
operations.

     The Company and its third party manufacturers are required to adhere to FDA
regulations setting forth requirements for current Good Manufacturing  Practices
("cGMP") and similar  regulations in other  countries,  which include  extensive
testing, control and documentation  requirements.  Ongoing compliance with cGMP,
labeling and other  applicable  regulatory  requirements  is  monitored  through
periodic  inspections  and market  surveillance  by state and federal  agencies,
including the FDA, and by comparable agencies in other countries. Failure of the
Company and its third-party  manufacturers to comply with applicable regulations
could result in sanctions  being imposed on us,  including  fines,  injunctions,
civil  penalties,  failure of the  government  to grant  premarket  clearance or
premarket  approval of drugs,  delays,  suspension  or  withdrawal of approvals,
seizures  or  recalls  of   products,   operating   restrictions   and  criminal
prosecutions.

Risks Associated with Reimbursement by Third-Party Payors

     Our business,  financial  condition and results of operations will continue
to be affected by the efforts of  governments  and other  third-party  payors to
contain or reduce the costs of  healthcare  through  various  means.  There have
been,  and we expect  that there will  continue  to be, a number of federal  and
state proposals to implement  government control of pricing and profitability of
therapeutic and diagnostic imaging agents such as our products.  In addition, an
emphasis on managed  increases  possible  pressure on pricing of these products.
While we cannot predict whether such legislative or regulatory proposals will be
adopted or the effects  such  proposals  or managed care efforts may have on our
business,  the announcement of such proposals and the adoption of such proposals
or efforts  could  have a material  adverse  effect on our  business,  financial
condition and results of  operations.  Further,  to the extent such proposals or
efforts have a material  adverse effect on other  companies that are prospective
corporate partners for the Company, our ability to establish strategic alliances
may be materially and adversely affected.

     Sales of our products depend in part on the  availability of  reimbursement
to the consumer from  third-party  payors,  including  Medicare,  Medicaid,  and
private health insurance plans.  Third-party payors are increasingly challenging
the prices charged for medical products and services.  There can be no assurance
- ---that our products will be considered cost-effective and that reimbursement to
consumers  will continue to be  available,  or will be sufficient to allow us to
sell our products on a competitive basis. Approval of our products for

                                       12
<PAGE>
reimbursement  by a third  party  payor  may  depend  on a  number  of  factors,
including the payor's  determination that our products are clinically useful and
cost-effective,  medically  necessary and not  experimental or  investigational.
Reimbursement  is determined by each payor  individually  and in specific cases.
The reimbursement  process can be time consuming and costly. If we cannot secure
adequate third party  reimbursement for our products,  there would be a material
adverse effect on our business, financial condition and results of operations.

Intense Competition in the Biotechnology and Pharmaceutical Industries

     The  biotechnology  and  pharmaceutical  industries  are subject to intense
competition from large  pharmaceutical,  biotechnology  and other companies,  as
well as universities and research institutions.

     Many of these competitors have, compared to us, substantial advantages with
respect to their:

          -  Financial, marketing, sales, manufacturing, distribution and
             technological resources;
          -  Sales and marketing expertise;
          -  Distribution channels;
          -  Experience in establishing third-party reimbursement for their
             products;
          -  Research and development expertise;
          -  Experience in conducting clinical trials;
          -  Experience in regulatory matters;
          -  Manufacturing efficiency; and
          -  Name recognition.

     Due to this intensely  competitive  environment,  there can be no assurance
that we will be able to compete  effectively  against such existing or potential
competitors or that  competition  will not have a material adverse effect on our
business, financial condition and results of operations.

     Quadramet  competes  with other more  traditional  treatments or therapies,
such as:

          -  External beam radiation;
          -  Chemotherapy agents;
          -  Narcotic analgesics; and
          -  Radiopharmaceuticals.

     In addition,  certain of our  competitors  may be in the process of seeking
FDA or  foreign  regulatory  approval  for their  own  products,  which  compete
directly or indirectly with ours.

     We are highly  dependent  upon  proprietary  technology and seek to protect
such technology through a combination of patents, licenses and trade secrets. We
have applied for, obtained and licensed patents for certain  proprietary aspects
of our  technology  and  processes  in the  U.S.  and  other  countries.  We are
particularly  dependent  upon the  enforceability  of our license  with Dow with
respect to  Quadramet.  There can be no  assurance  that our owned and  licensed
patents will prove to be enforceable or that additional  patents will be issued.
Neither can assurance be given that the technologies we use do not infringe upon
the  proprietary  rights  of  others,  although  we are not  aware  of any  such
infringement  or any adverse claim.  Insofar as we rely in part on trade secrets
and unpatented  know-how to maintain our competitive  position,  there can be no
assurance  that  others  will not  independently  develop  similar  or  superior
technologies  or that our trade  secrets and  know-how  will not become known to
others. We could incur  substantial costs in seeking  enforcement of our patents

                                       13
<PAGE>
against  infringement  or  preventing  unauthorized  use of our trade secrets by
others, or in defending patent infringement claims brought against the Company.

     Our  success  depends,  in part,  on our  ability,  and the  ability of our
collaborators or licensors,  to obtain  protection for products and technologies
under United States and foreign patent laws, to preserve  trade secrets,  and to
operate without infringing the proprietary  rights of third parties.  Because of
the substantial  length of time and expense  associated with  development of new
products,  the  biopharmaceutical  industry  places  considerable  importance on
obtaining,  and  maintaining,   patent  and  trade  secret  protection  for  new
technologies, products and processes. We have obtained rights to certain patents
and patent  applications  and may obtain or seek  rights  from third  parties to
additional  patents  and patent  applications.  There can be no  assurance  that
patent  applications  relating to our  products or  technologies  will result in
patents  being  issued,   that  any  issued  patents  will  afford  us  adequate
protection, or that such patents will not be challenged,  invalidated, infringed
or  circumvented.  Furthermore,  there can be no assurance  that others have not
developed,  or will not  develop,  similar  products or  technologies  that will
compete with ours without infringing upon our intellectual property rights.

     Legal standards relating to the scope of claims and the validity of patents
in the  biopharmaceutical  industry are  uncertain  and still  evolving,  and no
assurance can be given as to the degree of protection  that will be afforded any
patents we are issued or license from others. There can be no assurance that, if
challenged  by others in  litigation,  the patents we have been assigned or have
licensed from others will not be found  invalid.  There can be no assurance that
our  activities  would  not  infringe  patents  owned  by  others.  Defense  and
prosecution  of  patent  matters  can  be  expensive  and  time-consuming   and,
regardless  of  whether  the  outcome  is  favorable  to us,  can  result in the
diversion of substantial financial,  management and other resources.  An adverse
outcome could:

          -  Subject us to significant liability to third parties;
          -  Require us to cease any related research and development activities
             and product sales; or
          -  Require us to obtain licenses from third parties.

     No assurance can be given that any licenses required under any such patents
or proprietary  rights would be made available on terms  acceptable to us, if at
all.  Moreover,  the laws of certain  countries may not protect our  proprietary
rights to the same extent as United States law.

     Our success also depends on the skill,  knowledge,  and  experience  of our
scientific and technical  personnel.  To help protect our rights, we require all
employees, consultants, advisors and collaborators to enter into confidentiality
agreements  that require  disclosure,  and in most cases,  assignment  to us, of
their ideas,  developments,  discoveries and  inventions,  and that prohibit the
disclosure of confidential  information to anyone outside the Company. There can
be no assurance, however, that these agreements will provide adequate protection
for our trade secrets, know-how or other proprietary information in the event of
any unauthorized use or disclosure.

Product Development

     Product  development  involves  a high  degree  of  risk.  There  can be no
assurance that the product candidates we develop,  pursue or offer will prove to
be safe and effective,  will receive the necessary  regulatory approvals or will
ultimately  achieve market  acceptance.  These product  candidates  will require
substantial additional investment,  laboratory development, clinical testing and
regulatory approvals prior to their commercialization. There can be no assurance
that we will  not  experience  difficulties  that  could  delay or  prevent  the
successful  development,  introduction and marketing of new products.  If we are


                                       14

<PAGE>
unable to successfully  develop and commercialize  products on a timely basis or
at all, or achieve market acceptance of such products, there could be a material
adverse effect on our business, financial condition and results of operations.

     Before we obtain regulatory approvals for the commercial sale of any of our
products under development,  we must demonstrate through preclinical studies and
clinical  trials that the product is safe and efficacious for use in each target
indication.  The results from preclinical  studies and early clinical trials may
not be predictive of results that will be obtained in large-scale  testing,  and
there can be no assurance  that the our  clinical  trials will  demonstrate  the
safety and efficacy of any  products or will result in  marketable  products.  A
number of companies in the  biotechnology  industry  have  suffered  significant
setbacks in advanced  clinical trials,  even after promising  results in earlier
trials.  In  addition,  there can be no assurance  that product  issues will not
arise following successful clinical trials and FDA approval.

     The rate of  completion  of  clinical  trials  also  depends on the rate of
patient  enrollment.  Patient enrollment depends on many factors,  including the
size of the patient  population,  the nature of the  protocol,  the proximity of
patients to clinical sites and the eligibility criteria for the study. Delays in
planned patient enrollment may result in increased costs and delays, which could
have a material adverse effect on our business,  financial condition and results
of operations.

Government Regulation

     Any products  tested,  manufactured  or  distributed by us or on our behalf
pursuant to FDA  clearances or approvals are subject to pervasive and continuing
regulation  by numerous  regulatory  authorities,  including  primarily the FDA.
Changes in existing  requirements  or adoption of new  requirements  or policies
could adversely affect our ability to comply with regulatory requirements. If we
fail to comply with regulatory  requirements,  there could be a material adverse
effect on our business, financial condition and results of operations. There can
be no  assurance  that we will not be  required  to incur  significant  costs to
comply with laws and regulations in the future or that laws or regulations  will
not have a material  adverse effect upon our business,  financial  condition and
results of operations.

     Numerous  federal,  state  and  local  governmental   authorities  (each  a
"Regulatory  Agency"),  principally  the  FDA,  and  similar  agencies  in other
countries,  regulate the preclinical testing,  clinical trials,  manufacture and
promotion of any  compounds  we or our  collaborative  partners  develop and the
manufacturing  and marketing of any resulting  drugs.  The drug  development and
regulatory  approval  process is lengthy,  expensive,  uncertain  and subject to
delays.

          -   Any compound we or our collaborative partners develop must
              receive  Regulatory  Agency  approval  before  it  may  be
              marketed as a drug in a particular country.
          -   The regulatory process, which includes preclinical testing
              and clinical trials of each compound in order to establish
              its safety and  efficacy,  varies from country to country,
              can take  many  years  and  requires  the  expenditure  of
              substantial resources.
          -   In all  circumstances,  approval of the use of  previously
              unapproved   radioisotopes  in  certain  of  our  products
              requires   approval  of  either  the  Nuclear   Regulatory
              Commission  or equivalent  state  regulatory  agencies.  A
              radioisotope  is an  unstable  form  of an  element  which
              undergoes  radioactive  decay,  thereby emitting radiation
              which  may be used,  for  example,  to  image  or  destroy
              harmful growths or tissue.  There can be no assurance that
              such approvals  will be obtained on a timely basis,  or at
              all.
          -   Data obtained from preclinical and clinical activities are
              susceptible to varying  interpretations which could delay,
              limit or prevent Regulatory Agency approval.

                                       15

<PAGE>
          -   Delays or rejections may be encountered based upon changes
              in  Regulatory  Agency  policy  during  the period of drug
              development and/or the period of review of any application
              for  Regulatory  Agency  approval  for a  compound.  These
              delays  could  adversely   affect  the  marketing  of  any
              products we or our collaborative partners develop,  impose
              costly  procedures  upon  our  activities,   diminish  any
              competitive  advantages we or  collaborative  partners may
              attain  and  adversely   affect  our  ability  to  receive
              royalties.

     There can be no  assurance  that,  even after  such time and  expenditures,
Regulatory  Agency approvals will be obtained for any compounds  developed by or
in collaboration with the Company. Moreover, if Regulatory Agency approval for a
drug is granted,  such approval may entail limitations on the indicated uses for
which it may be  marketed  that could  limit the  potential  market for any such
drug.  Furthermore,  if and when  such  approval  is  obtained,  the  marketing,
manufacture,  labeling, storage and record keeping related to our products would
remain  subject to extensive  regulatory  requirements.  Discovery of previously
unknown problems with a drug, its manufacture, or its manufacturer may result in
restrictions on such drug, manufacture or manufacturer,  including withdrawal of
the drug from the market.  Failure to comply with regulatory  requirements could
result in fines, suspension of regulatory approvals,  operating restrictions and
criminal prosecution.

     The U. S. Food,  Drug and  Cosmetics  Act  requires  that our  products  be
manufactured   in  FDA  registered   facilities   subject  to  inspection.   The
manufacturer  must be in compliance with current good  manufacturing  practices,
or, cGMP, which imposes certain  procedural and documentation  requirements upon
us, and our  manufacturing  partners with respect to  manufacturing  and quality
assurance activities. Noncompliance with cGMP can result in, among other things,
fines, injunctions,  civil penalties,  recalls or seizures of products, total or
partial  suspension of production,  failure of the government to grant premarket
clearance or premarket approval for drugs, withdrawal of marketing approvals and
criminal prosecution. If we or our manufacturing partners were to fail to comply
with the  requirements of cGMP,  there could be a material adverse effect on the
Company's business, financial condition and results of operations.

Attraction and Retention of Key Personnel

     We are highly  dependent on the  principal  members of our  management  and
scientific  staff,  the  loss of whose  services  might  significantly  delay or
prevent the achievement of research,  development or strategic  objectives.  Our
success depends on our ability to retain key employees and to attract additional
qualified employees. Competition for such personnel is intense, and there can be
no assurance that we will be able to retain  existing  personnel and to attract,
assimilate or retain additional highly qualified employees in the future.

     We have an employment  agreement  with our  President  and Chief  Executive
Officer,  H. Joseph  Reiser,  Ph.D.,  which  provides for bonuses and vesting of
options for the purchase of shares of common stock based on continued employment
and on the  achievement  of  performance  objectives  defined  by the  Board  of
Directors. We do not have employment agreements with our other key personnel. If
we are unable to hire and retain  personnel in key  positions,  there could be a
material  adverse  effect on the  Company's  business,  financial  condition and
results of operations.

Potential Inadequacy of Product Liability Insurance

     Our business is subject to product liability risks inherent in the testing,
manufacturing  and  marketing of our  products.  There can be no assurance  that
product  liability claims will not be asserted against us, our  collaborators or
licensees. While we currently maintain product liability insurance in amounts we


                                       16

<PAGE>
believe are  adequate,  there can be no  assurance  that such  coverage  will be
adequate to protect us against future product  liability  claims or that product
liability  insurance  will be  available  to us in the  future  on  commercially
reasonable terms, if at all. Furthermore, there can be no assurance that we will
be able to avoid  significant  product  liability claims and adverse  publicity.
Consequently, a product liability claim or other claim with respect to uninsured
or  underinsured  liabilities  could  have  a  material  adverse  effect  on our
business, financial condition and results of operations.

Environmental Regulation

     We are  subject  to a  variety  of  local,  state  and  federal  government
regulations relating to:

          -  Storage;
          -  Discharge;
          -  Handling;
          -  Emission;
          -  Generation;
          -  Manufacture; and
          -  Disposal

of toxic,  infectious or other  hazardous  substances  used to  manufacture  our
products.  If we fail to comply with these  regulations,  we could be subject to
significant  liabilities,  which  could  have a material  adverse  effect on our
business, financial condition and results of operations.

Volatility of Stock Price

     The market  prices  for  securities  of  biotechnology  and  pharmaceutical
companies have historically  been highly volatile,  and the market has from time
to time experienced significant price and volume fluctuations that are unrelated
to the operating  performance of particular  companies.  The market price of our
common stock has fluctuated  over a wide range and may continue to fluctuate for
various reasons,  including,  but not limited to,  announcements  concerning the
Company or our competitors regarding:

          -  Results of clinical trials;
          -  Technological innovations or new commercial products;
          -  Changes in governmental regulation or the status of our regulatory
             approvals or applications;
          -  Changes in earnings;
          -  Changes in health care policies and practices;
          -  Developments or disputes concerning proprietary rights;
          -  Litigation or public concern as to safety of the our potential
             products; and
          -  Changes in general market conditions.


                                       17
<PAGE>

Impact of Anti-takeover Provisions on the Market Price of Common Stock

     We have  adopted  various  anti-takeover  provisions  which may  affect the
market price of the common stock.

     Our Board of Directors has the  authority,  without  further  action by the
holders of common stock, to issue from time to time, up to 5,200,000  additional
shares of  preferred  stock in one or more  classes  or  series,  and to fix the
rights and preferences of such preferred stock. Pursuant to these provisions, we
have implemented a Stockholder Rights Plan by which one preferred stock purchase
right is attached to each share of common  stock,  as a means to deter  coercive
takeover  tactics and to prevent an acquirer from gaining control of the Company
without some mechanism to secure a fair price for all of our  stockholders if an
acquisition was completed. These rights will be exercisable if a person or group
acquires beneficial ownership of 20% or more of our common stock and can be made
exercisable by action of our Board of Directors if a person or group commences a
tender offer which would result in such person or group beneficially  owning 20%
or more of our  common  stock.  Each right  will  entitle  the holder to buy one
one-thousandth  of a share of a new  series  of junior  participating  preferred
stock for $20.  If any person or group  becomes the  beneficial  owner of 20% or
more of CYTOGEN 's common stock (with  certain  limited  exceptions),  then each
right not owned by the 20% stockholder  will entitle its holder to purchase,  at
the right's then current exercise price,  common shares having a market value of
twice the  exercise  price.  In  addition,  if after any person has become a 20%
stockholder,  we  are  involved  in  a  merger  or  other  business  combination
transaction with another person,  each right will entitle its holder (other than
the 20%  stockholder) to purchase,  at the right's then current  exercise price,
common shares of the acquiring  company having a value of twice the right's then
current exercise price.

     We are subject to  provisions of Delaware  corporate law which,  subject to
certain exceptions, will prohibit us from engaging in any "business combination"
with a person who, together with affiliates and associates,  owns 15% or more of
our  common  stock (an  "Interested  Stockholder")  for a period of three  years
following the date that such person became an Interested Stockholder, unless the
business combination is approved in a prescribed manner.

     These  provisions  of the  Stockholder  Rights  Plan,  our  Certificate  of
Incorporation, and of Delaware law may have the effect of delaying, deterring or
preventing  a change in  control of the  Company,  may  discourage  bids for the
common stock at a premium over market price and may adversely  affect the market
price, and the voting and other rights of the holders, of the common stock.


Impact of Shares Eligible for Future Sale on the Market Price of the Common
Stock

     A large number of shares of common stock already  outstanding,  or issuable
upon  exercise of options  and  warrants,  are  eligible  for resale,  which may
adversely affect the market price of the common stock. As of March 31, 1999, the
Company  had  65,112,000  shares  of common  stock  outstanding.  An  additional
7,446,099  shares of common stock are issuable upon the exercise of  outstanding
options  and  warrants  (including  300,000  shares  issuable  upon  exercise of
warrants granted to Kingsbridge and the May Davis Group,  Inc.,  placement agent
for the Equity  Line  Agreement.  Substantially  all of such  shares  subject to
outstanding  options and warrants will,  when issued upon exercise  thereof,  be
available  for  immediate  resale in the public  market  pursuant  to  currently
effective registration  statements under the Securities Act of 1933, as amended,
or pursuant to Rule 701 promulgated thereunder.


                                       18
<PAGE>


                         PRICE RANGE OF OUR COMMON STOCK

         Our common stock is  currently  quoted on the Nasdaq Stock Market under
the symbol  "CYTO." For each quarter since the  beginning of 1996,  the high and
low sale prices for our common stock, as reported by Nasdaq, were as follows:

1996                                                              High      Low
- ----                                                              ----      ---
First Quarter................................................      10      5 1/8
Second Quarter...............................................   9 1/2    5 13/16
Third Quarter................................................       9     5 3/16
Fourth Quarter...............................................   7 1/8     4 7/16

1997
- ----
First Quarter................................................   6 1/2      4 3/4
Second Quarter...............................................  6 5/16    4 11/16
Third Quarter................................................  5 1/16      3 5/8
Fourth Quarter...............................................   4 3/4     1 7/16

1998
- ----
First Quarter................................................  2 7/16      1 1/4
Second Quarter...............................................       2        5/8
Third Quarter................................................  2 9/16        3/4
Fourth Quarter...............................................   1 7/8      11/16

1999
- ----
First Quarter................................................   1 1/2      14/16
Second Quarter...............................................       2        7/8



                                 DIVIDEND POLICY

     We have never paid or declared any cash  dividends on our common stock.  We
currently intend to retain any future earnings for our business and,  therefore,
do not  anticipate  paying cash  dividends  in the  foreseeable  future.  Future
dividends,  if  any,  will  depend  on,  among  other  things,  our  results  of
operations,  capital  requirements,  restrictions in loan agreements and on such
other  factors  as our  Board of  Directors,  in its  discretion,  may  consider
relevant.

                                 USE OF PROCEEDS

     We intend to use  substantially all of the proceeds from the sale of common
stock hereunder for general corporate purposes.


                                       19
<PAGE>

Important Factors Regarding Forward Looking Statements

     Certain   discussions   set  forth  above  regarding  the  development  and
commercialization   of  our  products  and   technologies  are  forward  looking
statements  that are subject to risks and  uncertainties.  The statements  under
this caption are intended to serve as cautionary  statements  within the meaning
of the Private  Securities  Litigation Reform Act of 1995. Certain statements in
this prospectus are forward-looking statements within the meaning of Section 27A
of the Securities Act and Section 21E of the Securities Exchange Act of 1934, as
amended.  The  Company's  actual  results  could  differ  materially  from those
anticipated in such  forward-looking  statements as a result of certain factors,
including those discussed in Risk Factors,  listed below or discussed  elsewhere
in this  prospectus,  and in the  Company's  filings  with  the  Securities  and
Exchange Commission:

     (i) the Company's  ability to continue as a going concern if the Company is
unable  to raise  sufficient  funds  or  generate  sufficient  cash  flows  from
operations to cover the cost of its  operations;  (ii) the Company's  ability to
access the  capital  markets  in the near term and in the  future for  continued
funding of  existing  projects  and for the pursuit of new  projects;  (iii) the
Company's ability to complete its  restructuring  plans timely and in a way that
permits  the  Company to operate  effectively;  (iv) the  ability to attract and
retain  personnel  needed for business  operations and strategic  plans; (v) the
timing and results of clinical studies,  and regulatory  approvals;  (vi) market
acceptance of the Company's products,  including programs designed to facilitate
use of the products,  such as the PIE Program;  (vii) demonstration over time of
the  efficacy  and  safety  of the  Company's  products;  (vii)  the  degree  of
competition from existing or new products;  (ix) the decision by the majority of
public and private insurance  carriers on whether to reimburse  patients for the
Company's products;  (x) the profitability of its products;  (xi) the ability to
attract,  and  the  ultimate  success  of,  strategic  partnering  arrangements,
collaborations, and acquisition candidates; (xii) the ability of the Company and
its partners to identify new products as a result of those  collaborations  that
are capable of achieving FDA approval,  that are cost-effective  alternatives to
existing  products  and that are  ultimately  accepted  by the key  users of the
product;  and  (xiii)  the  success of the  Company  in  establishing  marketing
programs  and in  obtaining  marketing  approvals  in  Canada  and  in  European
countries,  in achieving milestones and achieving sales of products resulting in
royalties;  and  (xiv)  the  ability  to  protect  and  practice  the  Company's
intellectual property, including patents and know-how.

     Any  forward-looking  statements are made as of the date of this prospectus
and the  Company  assumes  no  obligation  to  update  any such  forward-looking
statements or to update the factors  which could cause actual  results to differ
materially from those anticipated in such forward-looking statements.


                       WHERE YOU CAN FIND MORE INFORMATION

     The  Company  has  filed  with  the  Securities  and  Exchange  Commission,
Washington,  D.C.  20549,  a  Registration  Statement  on  Form  S-3  under  the
Securities Act with respect to the shares of common stock offered  hereby.  This
prospectus does not contain all of the information set forth in the Registration
Statement and the exhibits and schedules thereto.  For further  information with
respect to the Company and the common stock offered hereby, reference is made to
the  Registration  Statement  and the exhibits and  schedules  filed  therewith.
Statements  contained in this  prospectus  as to the contents of any contract or
any  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.  A copy of the Registration  Statement may be
inspected  without charge at the offices of the  Commission in Washington,  D.C.
20549,  and  copies  of all or any  part of the  Registration  Statement  may be
obtained from the Public Reference Section of the Commission,  Washington,  D.C.
20549 upon the payment of the fees prescribed by the Commission.  The Commission

                                       20
<PAGE>

maintains  a Web site  (http://www.sec.gov)  that  contains  reports,  proxy and
information statements and other information regarding registrants,  such as the
Company,  that  file  electronically  with  the  Commission.  The  Company  also
maintains a Web site (http://www.cytogen.com).


                              Plan of Distribution

     We plan to offer shares of common stock  registered  hereby directly to The
State of  Wisconsin  Investment  Board at a  discount  of 7.25%  from the public
offering price.

     Our common  stock is listed on the  Nasdaq  Stock  Market  under the symbol
"CYTO."

     We will bear all expenses of registering  the common stock  hereunder.

     The terms of any sales of any of the common stock registered hereby will be
set  forth  in a  final  prospectus  filed  with  the  Securities  and  Exchange
Commission.

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

     The following  documents have been filed with the Commission by the Company
and are  incorporated  herein by  reference in this  Prospectus  and made a part
hereof (i) the Company's  Annual Report on Form 1O-K for the year ended December
31, 1998; (ii) the Company's Quarterly Report on Form 10-Q for the quarter ended
March 31, 1999; and (ii) all documents filed by the Company  pursuant to Section
13(a),  13(c), 14 or 15(d) of the Exchange Act after the date of this Prospectus
and prior to the termination of the offering of the Common Stock shall be deemed
to be  incorporated by reference in this Prospectus and to be a part hereof from
the date of  filing  such  documents.  Any  statement  contained  in a  document
incorporated or deemed to be incorporated by reference herein shall be deemed to
be modified or superseded  for purposes of this  Prospectus to the extent that a
statement  contained  herein or in any other  subsequently  filed document which
also  is or is  deemed  to be  incorporated  by  reference  herein  modifies  or
supersedes such statement.  Any statement so modified or superseded shall not be
deemed,  except as so  modified  or  superseded,  to  constitute  a part of this
Prospectus.  The Company will provide without charge to each person to whom this
Prospectus is delivered, upon the written or oral request of such person, a copy
of any or all of the foregoing documents incorporated herein by reference, other
than  exhibits  to  such  documents   (unless  such  exhibits  are  specifically
incorporated  by reference  into such  documents).  Requests for such  documents
should be  submitted  in  writing to Cytogen  Corporation,  Attention:  Investor
Relations,  600 College Road East,  CN 5308,  Princeton  New Jersey  08540-5308,
Telephone:(609) 750-8224.

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

     No person has been  authorized in connection  with the offering made hereby
to give  any  information.  or make any  representation  not  contained  in this
Prospectus and, if given or made, such information or representation must not be
relied upon as having been  authorized by the Company or any other person.  This
Prospectus  does not constitute an offer to sell or solicitation of any offer to
buy any of the  Securities  offered  hereby in any  jurisdiction  in which it is
unlawful  to make such  offer or  solicitation.  Neither  the  delivery  of this
Prospectus nor any sale made hereunder shall,  under any  circumstances,  create
any implication that the information  contained herein is correct as of any date
subsequent to the date hereof


                                       21

<PAGE>
                                 LEGAL MATTERS

     The validity of the shares of Common Stock offered  hereby will be passed
upon for the Company by Donald F. Crane, Jr., esq.


                                     EXPERTS

     The audited consolidated financial statements of the Company as of December
31, 1998 and 1997,  and for each of the three years in the period ended December
31, 1998 incorporated by reference in this Prospectus and registration statement
have been  audited by Arthur  Andersen  LLP,  independent  public  accounts,  as
indicated  in their  report with respect  thereto,  and are  included  herein in
reliance upon the authority of said firm as experts in giving said reports.



                                       22

<PAGE>





                                     Shares



                               CYTOGEN CORPORATION


                                  Common Stock



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

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



                                 August 4, 1999




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