CYTOGEN CORP
10-Q, 1996-08-02
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION    Conformed
                            Washington, D.C. 20549             Copy

                                   FORM 10-Q
                  (Mark One)
                  [X]  QUARTERLY REPORT PURSUANT TO SECTION 13
                       OR 15(d) OF THE SECURITIES EXCHANGE ACT 
                       OF 1934

                  For the quarterly period ended June 30, 1996
                                                 -------------
                                      OR

                  [_]  TRANSITION REPORT PURSUANT TO SECTION 13
                       OR 15(d) OF THE SECURITIES EXCHANGE ACT
                       of 1934

                  For the transition period from         to           
                                                 --------  ---------

                        Commission file number 0-14879
                                               -------
                              Cytogen Corporation
             ------------------------------------------------------
             (Exact name of Registrant as specified in its charter)

        Delaware                                     22-2322400
- -------------------------------                  ---------------------
(State or Other Jurisdiction of                    (I.R.S. Employer
Incorporation or Organization)                   Identification Number)

           600 College Road East, CN 5308, Princeton, NJ  08540-5308
           ---------------------------------------------------------
            (Address of Principal Executive Offices and Zip Code)

       Registrant's telephone number, including area code (609) 987-8200

     Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days : Yes X No .
                                           ---      ---

     Indicate the number of shares outstanding of each of the issuer's classes 
of common stock, as of the latest practicable date:

          Class                                   Outstanding at July 24, 1996
- ----------------------------                      ----------------------------
Common Stock, $.01 par value                                 47,925,175


Warrants to Purchase One Share of Common Stock,               4,023,495
          $.01 par value


<PAGE>
 
                     CYTOGEN CORPORATION AND SUBSIDIARIES
                                 June 30, 1996







PART I - FINANCIAL INFORMATION
- ------   ---------------------


Item 1 - Consolidated Financial Statements



            INTRODUCTORY NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
            -------------------------------------------------------

     The accompanying consolidated financial statements have been prepared by
the Registrant, without audit, pursuant to the rules and regulations of the
Securities and Exchange Commission. Certain information and note disclosure
normally included in annual consolidated financial statements prepared in
accordance with generally accepted accounting principles have been condensed or
omitted pursuant to those rules and regulations. It is suggested that these
condensed consolidated financial statements be read in conjunction with CYTOGEN
Corporation's (the "Company' or "CYTOGEN") audited consolidated financial
statements and notes thereto for the year ended December 31, 1995. In the
opinion of the Registrant, these consolidated financial statements contain all
adjustments necessary to present fairly the financial position of CYTOGEN as of
June 30, 1996, the results of operations for the three and six months ended June
30, 1996 and 1995, and the cash flows for the six months ended June 30, 1996 and
1995.

     The results of operations for the periods ended June 30, 1996 are not 
necessarily indicative of the operating results for the full year.

                                       2

<PAGE>
 
                     CYTOGEN CORPORATION AND SUBSIDIARIES

                          CONSOLIDATED BALANCE SHEETS

                 (All amounts in thousands, except share data)

<TABLE> 
<CAPTION> 

                                                                 June 30,            December 31,
ASSETS                                                            1996                  1995
                                                               (Unaudited)        
                                                             ===============        ===============
<S>                                                          <C>                   <C> 
Current Assets:
   Cash and cash equivalents                                 $       20,373         $        27,551
   Short term investments                                             5,070                   1,201
   Restricted cash                                                      383                     383 
   Accounts receivable, net                                             595                     284
   Inventories                                                          300                     356
   Other current assets                                                 370                     360
                                                              -------------          --------------
      Total current assets                                           27,091                  30,135
                                                              -------------          --------------
Property and Equipment:
   Leashold improvements                                              9,977                   9,850
   Equipment and furniture                                            6,941                   6,535
                                                              -------------          --------------
                                                                     16,918                  16,385

   Less--Accumulated depreciation and amortization                  (11,684)                (10,923)
                                                              -------------          --------------       
       Net property and equipment                                     5,234                   5,462
                                                              -------------          --------------
Other Assets                                                          1,550                   1,552
                                                              -------------          --------------
                                                             $       33,875         $        37,149
                                                              =============          ==============
<CAPTION> 
LIABILITIES AND STOCKHOLDERS' EQUITY
<S>                                                          <C>                    <C> 
Current Liabilities:
   Accounts payable and accrued liabilities                  $        3,442         $         6,385
   Current portion of long term liabilities                           1,901                   2,213
                                                              -------------          --------------
       Total current liabilities                                      5,343                   8,598
                                                              -------------          --------------
Long Term Liabilities                                                 3,425                   3,275
                                                              -------------          --------------
Stockholders' Equity:
   Preferred stock, $.01 par value, 5,400,000 shares
       authorized- none issued                                           -                       -
   Common stock, $.01 par value, 89,600,000 shares
       authorized, 48,052,000 and 46,040,000 shares
       issued and outstanding in 1996 and 1995, respectively            481                     460
   Additional paid-in capital                                       264,033                 253,122
   Unrealized gains on short term investments                            12                      34
   Accumulated deficit                                             (239,419)               (228,340)
                                                              -------------          --------------
       Total stockholders' equity                                    25,107                  25,276
                                                              -------------          --------------
                                                             $       33,875         $        37,149
                                                              =============          ==============
</TABLE> 


       The accompanying notes are an integral part of these statements.

                                       3
<PAGE>
 

                     CYTOGEN CORPORATION AND SUBSIDIARIES
                     CONSOLIDATED STATEMENTS OF OPERATIONS
               (All amounts in thousands, except per share data)
                                  (Unaudited)

<TABLE> 
<CAPTION> 


                                             Three Months Ended June 30,           Six Months Ended June 30, 
                                            -----------------------------        -----------------------------

                                                 1996            1995                 1996           1995
                                            -------------   -------------        -------------   -------------
<S>                                        <C>              <C>                      
REVENUES:
  Product related                          $         359   $         354        $         742   $         728
  License and contract                             1,194             458                2,009             792
                                            ------------    ------------         ------------    ------------

     Total Revenues                                1,553             812                2,751           1,520
                                            ------------    ------------         ------------    ------------

OPERATING EXPENSES:
  Research and development                         4,683           5,033                9,619          10,537
  Selling and marketing                              971             778                1,698           1,720
  Acquisition of technology rights                     -               -                    -          19,663
  General and administrative                       1,454           1,328                3,055           2,948
                                            ------------    ------------         ------------    ------------

     Total Operating Expenses                      7,108           7,139               14,372          34,868
                                            ------------    ------------         ------------    ------------

LOSS FROM OPERATIONS                       $      (5,555)  $      (6,327)       $     (11,621)  $     (33,348)
                                            ------------    ------------         ------------    ------------

GAINS ON INVESTMENTS, net                            387             213                  767             376
INTEREST EXPENSE                                    (111)           (148)                (225)           (296)
                                            ------------    ------------         ------------    ------------

NET LOSS                                   $      (5,279)  $      (6,262)       $     (11,079)  $     (33,268)
                                            ------------    ------------         ------------    ------------

NET LOSS PER COMMON SHARE                  $       (0.11)  $       (0.20)       $       (0.23)  $       (1.11)
                                            ------------    ------------         ------------    ------------


WEIGHTED AVERAGE COMMON
  SHARES OUTSTANDING                              47,825          31,923               47,378          29,982
                                            ------------    ------------         ------------    ------------
</TABLE> 

       The accompanying notes are an integral part of these statements.


                                       4
<PAGE>
 

                     CYTOGEN CORPORATION AND SUBSIDIARIES
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                          (All amounts in thousands)
                                  (Unaudited)


<TABLE> 
<CAPTION> 



                                                                           Six Months Ended June 30,
                                                                        -------------------------------

                                                                              1996           1995      
                                                                        ===============================
<S>                                                                    <C>               <C> 

CASH FLOWS FROM OPERATING ACTIVITIES:                                            
Net Loss                                                               $     (11,079)    $     (33,268)
                                                                        -------------     -------------
Adjustments to Reconcile Net Loss to Cash Used for
   Operating Activities:
     Depreciation and Amortization                                               761               729
     Imputed Interest                                                            207               296
     Amortization of Deferred Charges                                            (17)              (18)
     Acquisition of Technology Rights                                             -             19,663
     Inventory Writedown                                                          -              1,144
     Stock Grants                                                                 -                 37
     Changes in Assets and Liabilities, Net of Effect
        from Acquisition:
        Accounts receivable, net                                                (311)             (239)
        Inventories                                                               56              (142)
        Other current assets                                                      (8)             (263)
        Accounts payable and accrued liabilities                              (2,943)              208
        Other liabilities                                                       (352)             (230)
                                                                        -------------     -------------

     Total adjustments                                                        (2,607)           21,185
                                                                        -------------     -------------

     Net cash used for operating activities                                  (13,686)          (12,083)
                                                                        -------------     -------------

CASH FLOWS FROM INVESTING ACTIVITIES:
(Increase) in Short Term Investments                                          (3,891)           (1,293)
Purchases of Property and Equipment                                             (533)             (390)
Net Cash Acquired in CytoRad Acquisition (See Note 6)                             -             11,009
                                                                        -------------     -------------

     Net cash (used for) provided by investing activities                     (4,424)            9,326
                                                                        -------------     -------------

CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from Issuance of Common Stock                                        10,932             4,300
                                                                        -------------     -------------

     Net cash provided by financing activities                                10,932             4,300
                                                                        -------------     -------------

Net (Decrease) Increase in Cash and Cash Equivalents                          (7,178)            1,543

Cash and Cash Equivalents, Beginning of Period                                27,551             7,700
                                                                        -------------     -------------

Cash and Cash Equivalents, End of Period                               $      20,373     $       9,243
                                                                        =============     =============

</TABLE> 


       The accompanying notes are an integral part of these statements.


                                       5
<PAGE>
 
                     CYTOGEN CORPORATION AND SUBSIDIARIES
                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


From time to time, the term "Company" as used herein, may include CYTOGEN and 
its wholly-owned subsidiary Cellcor, Inc. ("Cellcor") taken as a whole, where 
appropriate.

(Information as of June 30, 1996 and for the three and six months ended June 30,
1996 and 1995 is unaudited.)

1.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:

Basis of Consolidation

     The consolidated financial statements include the accounts of the Company 
and its wholly-owned subsidiaries.  Intercompany balances and transactions have 
been eliminated in consolidation.

Use of Estimates

     The preparation of financial statements in conformity with generally 
accepted accounting principles requires management to make estimates and 
assumptions that affect the reported amounts of assets and liabilities and 
disclosure of contingent assets and liabilities at the date of the financial 
statements and the reported amounts of revenues and expenses during the 
reporting period.  Actual results could differ from those estimates.

Cash and Cash Equivalents

     Cash and cash equivalents include cash on hand, cash in banks and all 
highly-liquid investments with a maturity of three months or less at the time
 of purchase.

Short Term Investments

     Management determines the appropriate classification of debt and equity 
securities at the time of purchase and re-evaluates such designation as of each 
balance sheet date.  At June 30, 1996, the Company's short term investments are 
classified as available for sale and are carried at fair value based on quoted 
market prices.  Differences between an investment's amortized cost and fair 
value are charged directly to stockholders' equity, net of income taxes.  
Accordingly, a net unrealized gain of approximately $12,000 has been recorded as
a separate component of stockholders' equity at June 30, 1996.

Restricted Cash

     The Company has entered into equipment lease financing arrangements that 
require the issuance of letters of credit that are secured by certain cash and 
cash equivalents.  The aggregate amount of these cash and cash equivalents total
$383,000 and are segregated and classified as restricted cash in the 
accompanying consolidated balance sheets.
<PAGE>
 

Other Assets

     Other assets consist primarily of undeveloped real property with a net book
value of $1.3 million, which is valued at the lower of cost or market (see 
Note 9.)

Revenue Recognition

     Product related revenues include product sales by CYTOGEN to its customers 
and in 1996, to its European distributor, CIS biointernational ("CISbio") (see
Note 2).  Product sales are recognized upon shipment of finished goods.  
Beginning in October 1995, as a result of CYTOGEN's acquisition of Cellcor (see 
Note 4), product related revenues also include the recovery of costs associated 
with the treatment of patients who have received the autolymphocyte therapy 
("ALT") for metastatic renal cell carcinoma ("mRCC") under a compassionate 
protocol and in 1996, also include the cost recovery associated with the 
Treatment IND program.

     License and contract revenues include milestone payments and fees under
collaborative agreements with third parties, the sale of research and
manufacturing services and materials, and revenues from other miscellaneous
sources. Revenues from milestone payments are recognized when all parties concur
that the events stipulated in the agreement have been achieved. Revenues from
cost-plus contracts are recognized when the costs are incurred.

Common Stock Outstanding

     As a result of the Cellcor merger, the issued and outstanding shares of 
Cellcor common stock and preferred stock ("Cellcor Shares") were converted into 
the right to receive shares of CYTOGEN common stock.  As of June 30, 1996, 
certain holders of Cellcor Shares had not yet exchanged their Cellcor Shares of 
CYTOGEN common stock.  For accounting purposes, all Cellcor Shares were deemed 
exchanged for issued and outstanding shares of CYTOGEN common stock as of the 
date of the Cellcor merger.  See Note 4.

New Accounting Pronouncements

     The Company will be required to adopt the disclosure requirement of 
Statement of Financial Accounting Standards No. 123, "Accounting for Stock-Based
Compensation," for the year ended December 31, 1996.  The adoption of this 
pronouncement will have no impact on the Company's statement of operations.

Reclassifications

     Certain reclassifications have been reflected in the 1995 financial 
statements to conform with the 1996 presentation.

2.   CIS BIOINTERNATIONAL AND FAULDING:

     In January 1996, CYTOGEN entered into a distribution agreement (the "CISbio
Agreement") with CISbio, granting to CISBio the exclusive right to distribute 
and sell OncoScint CR/OV in all the countries of the world, except for the U.S. 
and Canada.  The CISbio Agreement provides for payments upon execution of the 
agreement and upon achievement of a certain milestone, payments for minimum 
annual purchases of the components of OncoScint CR/OV by


                                       7
<PAGE>
 
CISbio, and certain royalties based upon net sales, if any, of OncoScint CR/OV 
by CISbio. For the three and six months ended June 30, 1996, CYTOGEN recorded 
$100,000 and $244,000, respectively, in license and product revenues from 
CISbio.

     In December 1995, CYTOGEN entered into a distribution agreement (the 
"Faulding Agreement") with Faulding (Canada) Inc. ("Faulding") granting to 
Faulding the exclusive right to distribute and sell OncoScint CR/OV in Canada. 
Faulding is currently pursuing the necessary regulatory approvals to market the 
product in Canada. In addition to a one-time, up-front cash payment for 
execution of the agreement, which amount was recognized by the Company in 1996, 
Faulding will be required to make additional payments upon achievement of
certain milestones, payments for minimum annual purchases of OncoScint CR/OV by
Faulding, and certain royalties based upon net sales, if any, of OncoScint CR/OV
by Faulding.

3.   ELAN CORPORATION:

     In December 1995, CYTOGEN entered into a research and development and 
option agreement (the "Elan Agreement") with Elan Corporation, plc ("Elan") 
under which both parties will implement a research program that combines 
CYTOGEN's Genetic Diversity Library ("GDL") technology with Elan's drug delivery
system technology to collaboratively develop orally administered products. 
Thereunder, Elan has been granted an option for the exclusive worldwide 
licensing rights to any products so developed and the Company will receive 
royalties based on sales, if any, of such products. Elan will provide the 
funding necessary for the Company to fulfill its obligations under the research 
program with aggregate payments for work performed by CYTOGEN not to exceed $1.5
million during the first sixteen months of the research program. For the three 
and six months ended June 30, 1996, CYTOGEN recorded $488,000 and $644,000, 
respectively, in contract revenues from Elan.

4.   CELLCOR, INC.:

     Pursuant to an Agreement and Plan of Merger dated June 15, 1995, as 
amended, in October 1995, CYTOGEN completed its acquisition of Cellcor and the 
related subscription offering (the "Subscription Offering"). As a result, 
CYTOGEN issued (i) 4,713,564 shares of CYTOGEN common stock to acquire Cellcor 
(see Note 1) and (ii) 5,144,388 shares of CYTOGEN common stock in connection 
with the Subscription Offering raising a total of $20.0 million, and has 
reserved for issuance up to 606,952 shares of CYTOGEN common stock issuable upon
the exercise of the options that were outstanding under the Cellcor employee 
stock option plans at the time of merger. The transaction was accounted for by 
using the purchase method of accounting, whereby the Company recorded a 
one-time, non-cash charge of approximately $26.2 million for acquisition of 
technology rights to its statement of operations during the three months ended 
December 31, 1995, which charge represented the amount by which the purchase 
price exceeded the fair value of net assets acquired from Cellcor.

5.   DUPONT MERCK:

     Pursuant to a license agreement dated as of December 20, 1994 and as 
amended on March 29, 1996 (the "DP/Merck Agreement"), CYTOGEN has sub-licensed 
to The DuPont Merck Pharmaceutical Company ("DuPont Merck") CYTOGEN's 
manufacturing and marketing rights to Quadramet in the U.S., Canada and Latin 
America (the "Territory Rights"), if and when approved for marketing in each 
applicable country. CYTOGEN has retained the right to co-


                                       8
<PAGE>
 
promote the product to nuclear medicine specialists.  Quadramet is a therapy 
agent for treatment of severe pain associated with cancers that spread to the 
bone.  CYTOGEN acquired the Territory Rights to Quadramet from The Dow Chemical 
Company ("Dow") pursuant to a license agreement, under which it assumed 
responsibility for the development and commercialization of the product (see 
Note 7).  The New Drug Application ("NDA") for Quadramet was officially filed by
FDA in August 1995.

        Pursuant to the terms of the DP/Merck Agreement, in January 1995,
CYTOGEN received from DuPont Merck $4.0 million for the sale of 908,265 shares
of CYTOGEN common stock to DuPont Merck and $1.3 million to fund additional
clinical programs to expand the use and marketing of Quadramet, of which
$334,000 and $667,000 were recognized as license and contract revenues during
the three and six months ended June 30, 1995, respectively. The remaining
$667,000 was classified as deferred revenues, and was recognized ratably
throughout 1995 as services under the contract were performed. For the three and
six months ended June 30, 1996, CYTOGEN recorded $365,000 and $796,000,
respectively, as license and contract revenues from DuPont Merck. The DP/Merck
Agreement further provides for future payments of up to $2.2 million toward
additional clinical programs, a $2.0 million milestone payment if and when
Quadramet receives FDA approval, additional payments upon achievements of
certain other milestones and royalty payments based on sales, including
guaranteed minimum payments.

6.      CYTORAD INCORPORATED:

        In February 1995, CYTOGEN completed its acquisition of CytoRad 
Incorporated ("CytoRad") pursuant to an Agreement and Plan of Merger dated 
November 15, 1994, under which CYTOGEN exchanged for each outstanding CytoRad 
unit (i) 1.5 shares of CYTOGEN common stock, (ii) a warrant to acquire one share
of CYTOGEN common stock for $8.00 that expires January 31, 1997 and (iii) a 
contingent value right ("CVR") to receive, under certain circumstances and at no
additional cost, up to one-half share of CYTOGEN common stock.  On February 29, 
1996, the Company announced that the CVRs had expired by their terms and were of
no further value.  Accordingly, the Company no longer has an obligation to issue
shares of its common stock to holders of CVRs on January 31, 1997.

        As a result of the merger, the Company acquired $11.7 million of 
CytoRad's cash and securities, before payment of certain transaction costs.  In 
addition, CYTOGEN recorded approximately $19.7 million for acquisition of 
technology and marketing rights as a charge to its statement of operations 
during the three months ended March 31, 1995, which charge represented the
amount by which the purchase price exceeded the fair value of net assets
acquired from CytoRad.

7.      THE DOW CHEMICAL COMPANY:

        In 1993, CYTOGEN acquired from Dow an exclusive license in the U.S. for 
Quadramet.  This license was amended in 1995 to expand the territory to include 
Canada and Latin America, and in 1996 to expand the field to include all 
osteoblastic diseases.  The Company will be required to pay to Dow $4.0 million 
if and when Quadramet receives FDA approval.  The agreement provides for 
additional payments by the Company upon achievement of certain milestones and 
royalties on net sales of the product once commercialized, including guaranteed 
minimum payments.

                                       9
<PAGE>
 
8.   REVENUES FROM MAJOR CUSTOMERS:

     Customers who contributed 10% or more of the Company's total product 
related, license and contract revenues were as follows:
<TABLE> 
<CAPTION> 
                          3 Months Ended June 30,       6 Months Ended June 30,
                         -------------------------     -------------------------
                             1996         1995             1996         1995
                            ------       ------           ------       ------
Customer
- ------------
<S>                         <C>          <C>              <C>          <C>
DuPont Merck (See Note 5)    23%          41%              29%          44%
Medi-Physics                 10%          21%              12%          21%
Elan (See Note 3)            31%           -               23%           -
</TABLE> 

Medi-Physics is a chain of radiopharmacies.

9.   LONG TERM LIABILITIES:
<TABLE> 
<CAPTION> 
                                                June 30,      December 31,
                                                  1996            1995
                                                --------      ------------
          <S>                                <C>              <C>
          Due to Knoll                       $ 4,415,000      $ 4,237,000
          Due to Chiron                          514,000          785,000
          Capital lease obligations              397,000          448,000
          Deferred charges                             -           18,000
                                              ----------       ----------
                                               5,326,000        5,488,000

          Less:  Current portion               1,901,000        2,213,000
                                              ----------       ----------
                                             $ 3,425,000      $ 3,275,000
                                              ==========       ==========
</TABLE> 


     In November 1994, CYTOGEN executed a termination agreement (the 
"Termination Agreement") with Knoll Pharmaceutical Company ("Knoll"). Pursuant 
to the Termination Agreement, the Company has reacquired from Knoll all U.S. 
marketing rights to OncoScint CR/OV (the "U.S. Rights"), which were previously 
granted to Knoll. The resulting liability of CYTOGEN to Knoll will be paid over 
a four-year period and without interest, as follows: $3.1 million in 1995 (which
amount has been paid); $1.6 million in 1996 (which amount was paid in July 
1996); $1.6 million in 1997; and $1.7 million in 1998. Imputed interest of 
$90,000 and $178,000 relating to the obligation, which was discounted based upon
a 10% interest rate, was recorded for the three and six months ended June 30, 
1996, respectively. For the three and six months ended June 30, 1995, imputed 
interest was $131,000 and $260,000, respectively.

     In December 1994, the Company entered into a disengagement agreement 
(the "Disengagement Agreement") with Chiron B.V., formerly EuroCetus B.V., 
successor in interest to EuroCetus International, N.V. ("Chiron"). Under the 
Disengagement Agreement, the Company reacquired the exclusive marketing and 
distribution rights in Europe (the "European Rights"), which were previously 
granted to Chiron, and purchased certain business assets relating to the 
European Rights. The resulting liability of CYTOGEN to Chiron will be paid over 
three years and without interest, as follows: $200,000 in 1995 (which amount has
been paid), $300,000 in 1996 (of which $100,000 has been paid) and $377,181 in 
1997. Payment is secured by a mortgage covering approximately 11 acres of 
undeveloped real property owned by the Company in Ewing, New Jersey. This 
obligation is non-recourse to the Company. Imputed interest of $14,000 and 
$29,000 relating to the obligation, which was discounted based upon a 10% 
interest

                                      10

<PAGE>
 
rate, was recorded for the three and six months ended June 30, 1996, 
respectively.  For the three and six months ended June 30, 1995, imputed 
interest was $18,000 and $36,000, respectively.


10. COMMON STOCK:

     Under an option agreement (the "Option") granted to Fletcher Capital 
Market, Inc. ("Fletcher") in May 1994, as amended, Fletcher purchased 
(i) 1.8 million shares of CYTOGEN common stock in August 1995, at an aggregate 
price of approximately $7.3 million, or $4.058 per share, (ii) 500,000 shares of
CYTOGEN common stock in November 1995, at an aggregate price of $2.3 million, or
$4.696 per share, and (iii) an aggregate of 1.0 million shares of CYTOGEN common
stock in January 1996, at an aggregate price of $4.7 million, or $4.70 per 
share.

     Pursuant to an Investment Agreement between the Company and Fletcher Fund, 
L.P., a Delaware limited partnership ("Fletcher Fund"), dated as of 
September 8, 1995 (as amended, the "Investment Agreement"), the Company sold 
665,352 shares of CYTOGEN common stock, for an aggregate purchase price of 
approximately $2.7 million.  Under the Investment Agreement, as amended by the 
First Amendment to Investment Agreement dated April 26, 1996 (the "Amendment"), 
the Company was also granted the right to issue and sell to Fletcher Fund, and 
Fletcher Fund will be obligated to purchase, up to 675,000 shares of CYTOGEN 
common stock from time to time (collectively, the "Put Rights") at a purchase 
price per share equal to 101% of the average of the daily volume weighted 
average price of CYTOGEN common stock on the Nasdaq National Market ("NASDAQ") 
during (a) a designated twenty-one business day period or (b) the last three 
business days of said designated twenty-one business day period, whichever is 
less.  The Put Rights, which were originally scheduled to expire on 
March 29, 1996, were extended until December 15, 1996 pursuant to the Amendment.
Under certain circumstances, Fletcher Fund will have the right to decrease or 
increase the number of shares of CYTOGEN Common Stock to be purchased in 
connection with the exercise of a Put Right by the Company, but in no event 
shall the total number of shares sold by the Company and purchased by Fletcher 
Fund pursuant to the Investment Agreement exceed 4.9% of the total number of 
shares of CYTOGEN common stock outstanding, after giving effect to the proposed 
sale and purchase of the shares in question.  The shares to be issued and sold 
in this transaction were registered pursuant to a registration statement on 
Form S-3 filed with the Securities and Exchange Commission ("SEC") in April
1994.

     In November 1995, CYTOGEN sold 1,256,565 shares of common stock to a 
private institutional investor in a private placement transaction pursuant to 
Regulation S of the Securities Act for an aggregate price of $5.0 million.  In 
April 1996, CYTOGEN sold an additional 729,394 shares of common stock to that 
same investor for an aggregate price of $5.0 million, pursuant to the exercise 
of the put right that was previously granted to the Company.

     CYTOGEN and Nomura Securities International, Inc. ("Nomura") executed an 
agreement effective as of February 23, 1996 that terminated the Purchase 
Agreement between CYTOGEN and Nomura dated March 28, 1995.  No sales of stock 
occurred under the terms of the agreement.

     See Notes 4,5 and 6 for information related to the Company's issuance of 
common stock in connection with the Cellcor merger, DP/Merck Agreement, and 
CytoRad merger.

                                      11
<PAGE>
 
Item 2 -  Management's Discussion and Analysis of Financial Condition and 
          Results of Operations

Background

     Historically, CYTOGEN's revenues have resulted primarily from (i) payments 
received from the sale of research services pursuant to collaborative 
agreements, (ii) fees generated from the licensing of its technology and 
marketing rights to its products and (iii) product related revenues on sale of 
its OncoScint products in the U.S. and Western Europe.

     In January 1995, CYTOGEN received from DuPont Merck $5.3 million pursuant 
to the DP/Merck Agreement (see Note 5 to the Consolidated Financial Statements),
of which $1.3 million was to fund additional clinical programs to expand the use
and marketing of Quadramet and $4.0 million was to purchase 908,265 shares of 
CYTOGEN common stock. In addition, for the three and six months ended June 30, 
1996, CYTOGEN recorded $365,000 and $796,000, respectively, in license and 
contract revenues from DuPont Merck. The NDA for Quadramet was accepted for 
filing by FDA effective August 1995. The timing and outcome of FDA's decision 
regarding Quadramet cannot be predicted by the Company.

     In February 1995, CYTOGEN acquired CytoRad by merging CytoRad with and into
a wholly-owned subsidiary of CYTOGEN. See Note 6 to the Consolidated Financial 
Statements. As a result of the merger, the Company acquired $11.7 million of 
CytoRad's cash and securities, before payment of certain transaction costs. In 
addition, during the three months ended March 31, 1995, the Company recorded a 
one-time non-cash charge to the statement of operations of $19.7 million for the
acquisition of technology rights pertaining to the merger.

     In December 1995, CYTOGEN entered into the Elan Agreement with Elan under 
which Elan will provide the funding necessary for the Company to fulfill its 
obligations under a research program with aggregate payments for work performed 
by CYTOGEN not to exceed $1.5 million during the first sixteen months of that 
research program. See Note 3 to the Consolidated Financial Statements. For the 
three and six months ended June 30, 1996, CYTOGEN recorded $488,000 and 
$644,000, respectively, in contract revenues from Elan.

     In 1996, the Company has organized itself into strategic business units 
("SBUs") -- manufacturing, medical affairs, marketing and sales, Cellcor and 
Genetic Diversity Library -- which SBUs are offering their respective resources 
and expertise in drug discovery, drug development, manufacturing and marketing 
to other emerging biotechnology companies or large pharmaceutical companies with
programs outside of their own core capabilities. The Company believes that, if 
successful, such organization will enable it to leverage existing assets and 
capabilities to attract new collaborations and partnership and increase 
revenues. There can be no assurance as the strategy's success or that revenues 
will increase markedly.

     To date, sales of OncoScint CR/OV in both the U.S. and European markets 
have been limited, in part, because OncoScint CR/OV is a "technique-dependent" 
product that requires a high degree of proficiency in nuclear imaging, as well 
as a thorough appreciation of the information the scan can provide. CYTOGEN is 
developing a new distribution and marketing approach by establishing a network 
of qualified nuclear medicine physicians through its Partners in Excellence of 
PIE Program (the "PIE Program"), through which the use of OncoScint can

                                      12
<PAGE>
 
be directed to sites trained and certified in acquiring, processing and 
interpreting antibody-derived images, thus providing additional quality control 
and support.  The PIE Program is being further developed in preparation for the 
launch of ProstaScint, for which a Product License Application ("PLA") was 
accepted as filed by FDA in March 1995.  ProstaScint was unanimously recommended
for approval by the Medical Imaging Drug Advisory Committee (an FDA advisory 
committee) during its July 1996 meeting.  The timing and outcome of FDA's formal
decision regarding ProstaScint cannot by predicted by the Company.

        In December 1995 and January 1996, CYTOGEN entered into agreements with 
Faulding and CISbio, respectively, to market and distribute OncoScint CR/OV 
outside the U.S.  Faulding is currently pursuing the necessary regulatory 
approvals in Canada. CISbio has advised the Company that, as of June 30, 1996,
it had relaunched OncoScint CR/OV in seven of the twelve European countries
where the product has been approved for marketing, and that it is in the process
of relaunching in the rest of the countries while initiating steps to obtain
regulatory approvals for additional markets in accordance with the terms of the
CISbio Agreement. See Note 2 to the Consolidated Financial Statements.

        On August 1, 1996, Cytogen entered into a co-promotion agreement (the 
"Co-Promotion Agreement") with C.R. Bard, Inc. ("Bard") pursuant to which 
Cytogen granted to Bard (i) the exclusive right to market and promote 
ProstaScint to urologists in the United States and (ii) the co-exclusive right 
with Cytogen to market and promote ProstaScint to managed care organizations in 
the United States.  The Co-Promotion Agreement provides that Bard shall make 
payments upon the occurrence of certain milestones or to obtain additional 
rights in selected countries outside the United States. During the term of the 
Co-Promotion Agreement, Bard will receive performance-based compensation for its
services.  The initial term of the Co-Promotion Agreement is ten (10) years from
the date of the product launch of ProstaScint.

        In October 1995, CYTOGEN completed its acquisition of Cellcor by merging
Cellcor with and into a wholly-owned subsidiary of CYTOGEN. See Note 4 to the
Consolidated Financial Statements. Cellcor is a biotechnology company focused on
the development and commercialization of ALT, a proprietary immunotherapy using
a patient's own white blood cells to augment the immune system and thereby treat
cancer and certain infectious diseases. In the fourth quarter of 1995, Cellcor
completed patient accrual for its Phase III pivotal clinical trial using ALT to
treat metastatic kidney cancer patients. The study is expected to conclude in
the fourth quarter of 1996. If results from the trial are favorable and FDA
concurs, the Company and FDA will determine the timing and contents of the
formal application with FDA seeking marketing approval. It is likely that ALT
would qualify for a new application called a Biologics License Application
("BLA"). The BLA is a result of FDA's initiative to accelerate review and
approval of cancer products specifically for autologous cell therapies (such as
Cellcor's ALT). There can be no assurance regarding the results of the study or
the timing or outcome of FDA's review.

        Cellcor has received FDA approval to proceed with a Treatment IND that 
allows ALT to be available as a treatment option for patients who have no 
satisfactory alternative therapy to treat their metastatic kidney cancer.  The 
Treatment IND also allows the Company to recover costs associated with the 
treatment.  ALT will be available through the Treatment IND while the Company 
continues to pursue FDA approval of ALT.  As a result of the Cellcor merger, 
beginning October 1995, the Company's product related revenues included the cost
recovery related to the treatment of patients receiving ALT under a 
compassionate protocol and in 1996, also included the cost recovery related to 
the Treatment IND program.  In addition, during the three months ended December 
31, 1995, the Company recorded a one-time non-cash charge to the statement of 
operations of approximately $26.2 million for acquisition of Cellcor technology 
rights.

                                      13

<PAGE>
 
Results of Operations

     Revenues. Total revenues for the three and six months ended June 30, 1996 
were $1.6 million and $2.8 million, respectively, compared to $812,000 and $1.5 
million recorded in the same periods of 1995. The increase from the prior year 
periods is primarily attributable to license and contract revenues realized 
under the agreements executed in the fourth quarter of 1995 and the first 
quarter of 1996 with Elan and CISbio, respectively. In addition, during the 
three and six months ended June 30, 1996, CYTOGEN recorded $365,000 and 
$796,000, respectively, in license and contract revenues from DuPont Merck
compared to $334,000 and $667,000 recorded in the same periods of the prior
year.

     For the three and six months ended June 30, 1996, product related revenues 
were $359,000 and $742,000, respectively, compared to $354,000 and $728,000 
recorded for the same periods of 1995. In addition to sales of OncoScint CR/OV, 
the 1996 product related revenues included cost recovery associated with the ALT
Treatment, for which $31,000 and $45,000 were recognized during the three and 
six months ended June 30, 1996, respectively. The 1995 product related revenues 
were from the sales of OncoScint CR/OV.

     License and contract revenues for three and six months ended June 30, 1996 
were $1.2 million and $2.0 million, respectively, compared to $458,000 and 
$792,000 recorded in the same periods of 1995. The increase over the prior year 
periods is primarily attributable to license and contract revenues from Elan, 
CISbio, Faulding and DuPont Merck.

     Operating Expenses. Operating expenses for the three and six months ended 
June 30, 1996 were $7.1 million and $14.4 million, respectively, compared to 
$7.1 million and $34.9 million recorded in the same periods of 1995. The 
year-to-date decrease from the prior year period is largely attributable to a 
one-time non-cash charge of $19.7 million recorded in the three months ended 
March 31, 1995 for the acquisition of technology rights associated with the 
CytoRad merger. After excluding this one-time charge, 1996 operating expenses, 
which included $893,000 and $1.9 million of expenses for the three and six 
months ended June 30, 1996, respectively, from Cellcor operations, were lower 
than those recorded in the comparable periods of 1995. The level of current year
operating expenses reflects the Company's objective to control spending and to 
focus its efforts on its highest priority products and technology, which are (i)
OncoScint CR/OV, (ii) Quadramct, (iii) ProstaScint, (iv) the GDL technology and 
(v) ALT therapy for mRCC.

     Research and development expenses for the three and six months ended June 
30, 1996 were $4.7 million and $9.6 million, respectively, compared to $5.0 
million and $10.5 million recorded in the same periods of 1995. These expenses 
principally reflect product development efforts and support for various ongoing 
clinical trials. The 1996 research and development expenses included $910,000 
and $1.8 million of expenses for the three and six months ended June 30, 1996, 
respectively, from Cellcor operations. The 1995 research and development 
expenses for the three and six months ended June 30, 1995 included a charge of 
$446,000 and $1.1 million, respectively, for inventory writedown of commercial 
inventory relating to OncoScint CR/OV.

     Selling and marketing expenses for the three and six months ended June 30, 
1996 were $971,000 and $1.7 million, respectively, compared to $778,000 and $1.7
million recorded in the same periods of 1995. The current three months increase 
from the prior year period is primarily

                                      14

<PAGE>
 
attributable to expenses associated with establishing the PIE Program.

    The acquisition of technology rights expense of $19.7 million was a one-time
non-cash charge recorded during the three months ended March 31, 1995, 
representing the amount by which the purchase price exceeded the fair value of 
net assets acquired in connection with the CytoRad merger.

    General and administrative expenses for the three and six months ended 
June 30, 1996 were $1.5 million and $3.1 million, respectively, compared to $1.3
million and $2.9 million recorded in the comparable periods of 1995. The
increase from the prior year periods is primarily attributable to expenses to
support Cellcor operations and to increased spending for professional and
consulting services.

    Other Income/Expense. Net gains on investments for the three and six months
ended June 30, 1996 were $387,000 and $767,000, respectively, compared to 
$213,000 and $376,000 realized in the same periods of 1995. The increase from 
the prior year periods is due primarily to higher average cash and short term 
investment balances for the periods.

    Interest expense for the three and six months ended June 30, 1996 was 
$111,000 and $225,000, respectively, compared to $148,000 and $296,000 recorded 
in the same periods of 1995. Imputed interest on liabilities associated with 
CYTOGEN's termination agreements with Knoll and Chiron were $104,000 and 
$207,000 for the three and six months ended June 30, 1996, respectively, 
compared to $148,000 and $296,000 recorded for the comparable periods of 1995.

    Net Loss. Net loss for the three months ended June 30, 1996 was $5.3 million
compared to a net loss of $6.3 million incurred in the same period of 1995. The 
loss per common share was $0.11 on 47.8 million average shares outstanding 
compared to $0.20 on 31.9 million average shares outstanding for the same period
in 1995. For the six months ended June 30, 1996, the net loss was $11.1 million 
compared to a $33.3 million loss recorded in the comparable period of the prior 
year. The loss per common share was $0.23 on 47.4 million average shares 
outstanding compared to $1.11 on 30.0 million average shares outstanding in 
1995. As discussed above, the decrease in the net loss and net loss per common 
share for the six months is primarily attributable to the charge to the 
statement of operations for the acquisition of technology rights. At June 30, 
1996, the Company had outstanding (i) options to purchase up to 3.2 million 
shares of CYTOGEN common stock under its various stock option plans with 
exercise prices ranging from $0.83 to $18.33 per share; (ii) warrants to 
purchase 4.3 million shares of CYTOGEN common stock with exercise prices ranging
from $8.00 to $18.87 per share; and (iii) certain put rights to issue and sell 
up to approximately 0.7 million shares of CYTOGEN common stock, subject to 
adjustment. The loss per share calculation stated above does not take into 
account the shares issuable in connection with such options, warrants and put 
rights as their effect is antidilutive.

Liquidity and Capital Resources

    The Company's cash and short term investments were $25.4 million as of 
June 30, 1996, compared to $28.8 million as of December 31, 1995. The cash used
for operating activities and purchases of property and equipment for the six
months ended June 30, 1996 were $13.7 million and $533,000, respectively,
compared to $12.1 million and $390,000 used in the same period of 1995. This
increase over the prior year period primarily reflects the cash used to fund
Cellcor


                                      15
<PAGE>
 
operations.

     Historically, the Company's primary sources of cash have been proceeds 
from the issuance and sale of its stock through public offerings and private 
placements, product related revenues, the sale of research services, fees paid 
under its license agreements and interest earned on its cash and short term 
investments.

     CYTOGEN Common Stock. In January 1996, Fletcher purchased an aggregate of 
1.0 million shares of CYTOGEN common stock at an aggregate price of 
approximately $4.7 million, or $4.70 per share, pursuant to the Option granted 
to Fletcher in May 1994, as amended. See Note 10 to the Consolidated Financial 
Statements.

     CYTOGEN and Nomura executed an agreement effective as of February 23, 1996 
that terminated the Purchase Agreement between CYTOGEN and Nomura dated March 
28, 1995. No sales of stock occurred under the terms of the agreement.

     In April 1996, CYTOGEN sold 729,394 shares of common stock to a private 
institutional investor for an aggregate price of $5.0 million, pursuant to the 
exercise of a put right that was previously granted to the Company by that 
investor. See Note 10 to the Consolidated Financial Statements.

     Pursuant to the Investment Agreement, as amended in April 1996, between 
CYTOGEN and Fletcher Fund, CYTOGEN has the right until December 15, 1996 to 
issue and sell to Fletcher Fund, and Fletcher Fund will be obligated to 
purchase, up to 675,000 shares of CYTOGEN common stock from time to time at a 
purchase price per share equal to 101% of the average of the daily volume 
weighted average price of CYTOGEN common stock on NASDAQ during (a) a designated
twenty-one business day period or (b) the last three business days of said 
designated twenty-one business day period, whichever is less. Under certain 
circumstances, Fletcher Fund will have the right to decrease or increase the 
number of shares of CYTOGEN Common Stock to be purchased in connection with the 
exercise of a Put Right by the Company, but in no event shall the total number 
of shares sold by the Company and purchased by Fletcher Fund pursuant to the 
Investment Agreement exceed 4.9% of the total number of shares of CYTOGEN common
stock outstanding, after giving effect to the proposed sale and purchase of the 
shares in question.  The shares to be issued and sold in this transaction were
registered pursuant to a registration statement on Form S-3 filed with the SEC 
in April 1994.  See Note 10 to the Consolidated Financial Statements.

     In April 1996, the SEC declared effective the Company's new shelf 
registration statement on Form S-3, which registers 5.0 million shares of common
stock.  Under the shelf registration, CYTOGEN may sell shares on a negotiated or
competitive bid basis through underwriters, dealers or agents designated from 
time to time, or directly to other purchasers from time to time, as market 
conditions permit.  CYTOGEN has not entered into any agreement relating to the 
sale of these shares.

     Product Related Revenues.  To date, sales of OncoScint CR/OV have not been 
significant and are not expected to become a significant source of cash flow in 
1996.  CYTOGEN is developing the PIE Program as described above.  Depending on 
the success of the PIE Program, significant resources might be required.  There 
can be no assurance that this marketing strategy,

                                      16
<PAGE>
 
if successful, will result in increased revenues.

     In November 1994, the Company executed the Termination Agreement with 
Knoll, pursuant to which the Company is required to pay to Knoll, over a 
four-year period and without interest, $3.0 million to reacquire the U.S. Rights
and $5.0 million of liabilities previously incurred under the terms of a 
license, supply and marketing agreement executed in December 1991. The payment 
of these liabilities will be made as follows: $3.1 million in 1995 (which amount
has been paid); $1.6 million in 1996 (which amount was paid in July 1996); $1.6 
million in 1997; and $1.7 million in 1998.

     In December 1994, CYTOGEN entered into the Disengagement Agreement with 
Chiron to reacquire the European Rights and purchase certain business assets 
relating to the European Rights. The resulting liability of CYTOGEN to Chiron 
will be paid over three years and without interest, as follows: $200,000 in 1995
(which amount has been paid); $300,000 in 1996 (of which $100,000 has been 
paid); and $377,000 in 1997. Payment is secured by a mortgage covering 
approximately 11 acres of undeveloped real property owned by the Company in 
Ewing, New Jersey. This obligation is non-recourse to the Company.

     In December 1995 and January 1996, CYTOGEN entered into agreements with 
Faulding and CISbio, respectively, to market and distribute OncoScint CR/OV 
outside the U.S. Faulding is currently pursuing the necessary regulatory 
approvals in Canada. As described above, CISbio is actively marketing OncoScint 
CR/OV in certain countries in Europe. In addition to one-time, up-front cash 
payments for execution of the agreements, which amounts were recognized by the 
Company in 1996, each of Faulding and CISbio will be required to make payments 
upon the achievement of certain milestones, payments for the purchase of 
products and royalties on net sales, if any. See Note 2 to the Consolidated 
Financial Statements.

     Beginning October 1995, as a result of the Cellcor merger, the Company's 
product related revenues included the cost recovery related to the treatment of 
patients receiving ALT under a compassionate protocol, and in 1996 also included
the cost recovery associated with the Treatment IND program.

     Research Services and Licenses. Pursuant to the terms of the DP/Merck 
Agreement between CYTOGEN and DuPond Merck, CYTOGEN will receive from DuPont 
Merck future payments of up to $2.2 million towards additional clinical 
programs, a $2.0 million milestone payment if and when Quadramet receives FDA 
approval and royalty payments based on sales, including guaranteed minimum 
payments. For the three and six months ended June 30, 1996, CYTOGEN recorded 
$365,000 and $796,000, respectively, in license and contract revenues from 
DuPont Merck. See Note 5 to the Consolidated Financial Statements.

     CYTOGEN acquired an exclusive license in the U.S. from Dow for Quadramet in
1993. This license was later amended in 1995 and 1996. See Note 7 to the 
Consolidated Financial Statements. The Company will be required to pay to Dow 
$4.0 million if and when Quadramet receives FDA approval. The agreement provides
for additional payments by the Company upon achievement of certain milestones 
and royalties on net sales of the product once commercialized, including 
guaranteed minimum payments.

     In December 1995, the Company and Elan entered into the Elan Agreement, 
under which

                                      17
<PAGE>
 
Elan will provide the funding necessary for the Company to fulfill its 
obligations under the research program, with aggregate payments for work 
performed by CYTOGEN not to exceed $1.5 million during the first sixteen months 
of the research program. For the three and six months ended June 30, 1996, 
CYTOGEN recorded $488,000 and $644,000, respectively, in contract revenues from 
Elan. See Note 3 to the Consolidated Financial Statements.

     The Company's capital and operating requirements, as described above, may 
further change depending upon several factors, including: (i) the amount of 
resources which the Company devotes to clinical evaluations and the 
establishment of manufacturing, marketing and sales capabilities; (ii) results 
of preclinical testing, clinical trials and research and development activities;
and (iii) competitive and technological developments. The Company plans to 
continue to control spending and expects that its existing cash and short term 
investments of $25.4 million at June 30, 1996, together with other financing and
acquisition opportunities which may become available, the potential sales of 
stock pursuant to the Put Rights described above and the receipt of additional 
funds from DuPont Merck and Elan in accordance with the terms of the DP/Merck 
Agreement and Elan Agreement, respectively, will be adequate to support the 
Company's operations into 1997.

     The Company's financial strategy is to meet its capital and operating
requirements through revenues from existing products, the establishment of
strategic marketing alliances and research and development partnerships, the
acquisition, in-licensing and development of other technologies, products or
services, subcontract manufacturing revenues, license and contract revenues,
sale of equity securities as market conditions permit, interest income, and a
continued commitment to control spending. Certain of these transactions may
require payments by the Company in either cash or stock in addition to the costs
associated with developing and marketing any product or technology and, if 
successful, increase long term revenues. There can be no assurance as to the 
strategy's success or that any resulting funds will be sufficient to meet the 
Company's cash requirements through the time that product related resources are 
sufficient to cover the Company's operating expenses.

     The foregoing discussion contains historical information as well as forward
looking statements that involve a number of risks and uncertainties. In addition
to the risks discussed above, among other factors that could cause actual 
results to differ materially from expected results are the following: (i) the 
timing and results of clinical studies; (ii) market acceptance of the Company's 
products, including programs designed to facilitate use of the products, such as
the PIE Program and the use of teleradiology; (iii)the profitability of its 
products; (iv) the ability to attract, and the ultimate success of strategic 
partnering arrangements, collaborations, and acquisition candidates; (v) 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; (vi) the success of the Company's 
distributors in obtaining marketing approvals in Canada and in additional 
European countries, in achieving milestones and achieving sales of products 
resulting in royalties; and (vii) the Company's ability to access the capital 
markets in the future for continued funding of existing projects and for the 
pursuit of new projects.

                                      18

<PAGE>
 
PART II   -    OTHER INFORMATION
- -------        -----------------

Item 4    -    Submission of Matters to the Vote of Security Holders
- ------

      On May 22, 1996, the Company held its annual meeting of stockholders to
      (i) elect directors, (ii) consider and act upon a proposal to amend the
      Company's Certificate of Incorporation to increase the total number of
      authorized shares of capital stock from 75,000,000 shares to 95,000,000
      shares and to increase the total number of authorized shares of Common
      Stock from 69,600,000 shares to 89,600,000 shares, (iii) consider and act
      upon a proposal to amend the CYTOGEN Corporation 1988 Stock Option Plan
      for Non-Employee Directors, (iv) consider and act upon a proposal to amend
      the CYTOGEN Corporation 1995 Stock Option Plan, (v) ratify the appointment
      of Arthur Andersen LLP as independent auditors, and (vi) transact such
      other business as might be brought before the meeting.

      The following tables set forth information regarding the number of votes
      cast for, against or withheld, abstentions and broker non-votes, with
      respect to each matter presented at the meeting.

      (i)  Election of Directors:

<TABLE> 
<CAPTION> 
                                              Against or                 Broker
      Nominee                        For       Withheld   Abstentions  Non-Votes
      -------                        ---      ----------  -----------  ---------
<S>                                  <C>      <C>         <C>          <C>      

      Charles E. Austin          42,069,006   1,189,970        0           0
      John E. Bagalay Jr.        42,114,033   1,144,943        0           0
      Ronald J. Brenner          42,112,891   1,146,085        0           0 
      James A. Grigsby           42,081,606   1,177,370        0           0 
      Robert F. Hendrickson      42,093,681   1,165,295        0           0 
      T. Jerome Madison          42,113,877   1,145,099        0           0 
      Thomas J. McKearn          42,115,980   1,142,996        0           0 
      William C. Mills III       42,116,609   1,142,367        0           0 
      Donald E. O'Neill          42,090,040   1,168,936        0           0 

</TABLE> 

      (ii)  Amend the Company's Certificate of Incorporation:

<TABLE> 
<CAPTION> 
                                              Against or                 Broker
                                     For       Withheld   Abstentions  Non-Votes
                                     ---      ----------  -----------  ---------
<S>                                  <C>      <C>         <C>          <C>      
                                  40,235,954  2,735,666     287,356           0
</TABLE> 

      (iii)  Amend the CYTOGEN Corporation 1988 Stock Option Plan for 
             Non-Employee Directors:

<TABLE> 
<CAPTION> 
                                              Against or                 Broker
                                     For       Withheld   Abstentions  Non-Votes
                                     ---      ----------  -----------  ---------
<S>                                  <C>      <C>         <C>          <C>      
                                  40,639,222  2,218,538     401,216           0
</TABLE> 

      (iv)  Amend the CYTOGEN Corporation 1995 Stock Option Plan:

                                      19
<PAGE>
 
                                                Against or               Broker
                                      For        Withheld  Abstentions Non-Votes
                                      ---       ---------- ----------- ---------
                                   38,566,669   4,305,944    386,363          0

     (v)   Appointment of Arthur Andersen LLP as independent auditors:

                                                Against or               Broker
                                      For        Withheld  Abstentions Non-Votes
                                      ---       ---------- ----------- ---------
                                   42,817,539     238,496    202,947          0

    (vi)  No other business was transacted at the meeting.

Item 6 -  Exhibits and Reports on Form 8-K
- ------  
             (a) Exhibits:
           
              3.-  Certificate of Incorporation of CYTOGEN Corporation.

             10.1- Second Amendment to the License Agreement between CYTOGEN 
                   Corporation and The Dow Chemical Company dated May 20,
                   1996.*

             10.2- Amendment No. 1 to the CYTOGEN Corporation 1995 Stock
                   Option Plan dated May 22, 1996.

             10.3- Amendment No. 2 to the CYTOGEN Corporation 1988 Stock
                   Option Plan for Non-Employee Directors dated May 22, 1996.

             27-   Financial Data Schedule (Submitted to SEC only in electronic 
                   format).

     CYTOGEN Corporation has requested confidential treatment of certain
     provisions contained in this exhibit. The copy filed as an exhibit omits
     the information subject to the confidentiality request.

             (b)   Reports on Form 8-K:

             None

                                      20





<PAGE>
 
                                  SIGNATURES


     Pursuant to the requirements of the Securities Exchange Act of 1934, the 
registrant has duly caused this report to be signed on its behalf by the 
undersigned thereunto duly authorized.


                                         CYTOGEN CORPORATION



Date August 2, 1996                      By /s/ T. Jerome Madison
     ----------------------------        ---------------------------------
                                         T. Jerome Madison
                                         Chief Financial Officer
                                         (Authorized Officer and Principal 
                                         Financial Officer)



                                      21

<PAGE>
 
                     RESTATED CERTIFICATE OF INCORPORATION
                                      OF
                              CYTOGEN CORPORATION


          Cytogen Corporation, a corporation organized and existing under the
laws of the State of Delaware, hereby certifies as follows:

          FIRST:  The name of the corporation is Cytogen Corporation.  Cytogen
          -----                                                               
Corporation was originally incorporated under the name of Hybridex, Inc., and
the original Certificate of Incorporation of the corporation was filed with the
Secretary of State of the State of Delaware on March 3, 1980.

          SECOND:  This Restated Certificate of Incorporation was duly
          ------                                                      
adopted in accordance with the provisions of Section 245 of the General
Corporation Law of the State of Delaware by the Board of Directors without a
vote of the stockholders of the corporation and only restates and integrates and
does not further amend the provisions of the Certificate of Incorporation of the
corporation as heretofore amended or supplemented.  There is no discrepancy
between those provisions and the provisions of this Restated Certificate of
Incorporation.

          THIRD:  The text of the Restated Certificate of Incorporation of the
          -----                                                               
corporation reads in its entirety as follows:


                         CERTIFICATE OF INCORPORATION
                                      OF
                              CYTOGEN CORPORATION

          FIRST:  The name of the Corporation is Cytogen Corporation.
          -----                                                      

          SECOND:  The address of the Corporation's registered office in the
          ------                                                            
State of Delaware is 229 South State Street, in the City of Dover, County of
Kent, Delaware 19901.  The name of its registered agent at such address is
United States Corporation Company.

          FOURTH:  The purpose of the Corporation is to engage in any lawful act
          ------                                                                
or activity for which corporations may be organized under the General
Corporation Law of the State of  Delaware.

          FIFTH:     A.    Total Capital Stock.  The total number
          -----                                                               
of shares of all classes of capital stock which the Corporation shall have
authority to issue is twenty-seven million (27,000,000) shares, of which twenty-
one million six hundred
<PAGE>
 
thousand (21,600,000) shall be shares of common Stock, the par value of which is
one cent ($.01) per share, amounting in the aggregate to two hundred sixteen
thousand dollars ($216,000), and five million four hundred thousand (5,400,000)
shall be shares of Preferred Stock, the par value of which is one cent ($.01)
per share, amounting in the aggregate to fifty-four thousand dollars ($54,000).

                   B.    Common Stock. Each holder of Common Stock shall be 
entitled to one vote for each share of Common Stock held on all matters on which
holders of Common Stock shall be entitled to vote.

                   C.    Preferred Stock. The Board of Directors of the 
Corporation is authorized to cause the Preferred Stock to be issued in one or
more series, with such voting powers, full or limited, or no voting powers, and
with such designations, preferences and relative, participating, optional or
other special rights and qualifications, limitations or restrictions thereof, as
shall be stated and expressed in the resolution or resolutions providing for the
issue of such stock adopted by the Board of Directors. The Board of Directors of
the Corporation is expressly authorized to adopt such resolution or resolutions
and to issue such stock as may be desirable.

                   D.    Residual Rights. All rights accruing to the outstan-
ding shares of the Corporation not expressly provided for to the contrary herein
shall be vested in the outstanding shares of Common Stock and Preferred Stock
pari passu.
- ---- -----

          SIXTH:  Elections of directors need not be by written ballot
          -----                                                       
unless the bylaws of the Corporation shall otherwise provide.

          SEVENTH:  Whenever a compromise or arrangement is proposed between
          -------                                                           
this Corporation and its creditors or any class of them and/or between this
Corporation and its stockholders or any class of them, any court of equitable
jurisdiction within the State of Delaware may, on the application in a summary
way of this Corporation or of any creditor or stockholder thereof or on the
application of any receiver or receivers appointed for this Corporation under
the provisions of section 291 of Title 8 of the Delaware Code, or on the
application of trustees in dissolution or of any receiver or receivers appointed
for this Corporation under the provisions of section 279 of Title 8 of the
Delaware Code, order a meeting of the creditors or class of creditors, and/or of
the stockholders or class of stockholders of this

                                     - 2 -
<PAGE>
 
Corporation, as the case may be, to be summoned in such manner as the said court
directs. If a majority in number representing three-fourths in value of the
creditors or class of creditors, and/or of the stockholders or class of
stockholders of this Corporation, as the case may be, agree to any compromise or
arrangement and to any reorganization of this Corporation as consequence of such
compromise or arrangement, the said compromise or arrangement and the said
reorganization shall, if sanctioned by the court to which said application has
been made, be binding on all the creditors or class of creditors, and/or on all
of the stockholders or class of stockholders, of this Corporation, as the case
may be, and also on this Corporation.

          EIGHTH:  The Board of Directors of the Corporation is authorized and
          ------                                                              
empowered from time to time in its discretion to make, alter, amend or repeal
bylaws of the Corporation, except as such power may be restricted by the General
Corporation Law of the State of Delaware.

          NINTH:  No director of the Corporation shall be personally liable to
          -----                                                               
the Corporation or its stockholders for monetary damages for breach of fiduciary
duty by such director as a director; provided, however, that this Article NINTH
shall not eliminate or limit the liability of a director to the extent provided
by applicable law (i) for any breach of the director's duty of loyalty to the
Corporation or its stockholders; (ii) for acts or omissions not in good faith or
which involve intentional misconduct or a knowing violation of law; (iii) under
Section 174 of the General Corporation Law of the State of Delaware; or (iv) for
any transaction from which the director derived an improper personal benefit.
If the General Corporation Law of the State of Delaware is amended after
approval by the stockholders of the Corporation of this Article NINTH to further
eliminate or limit the personal liability of directors, then the liability of a
director of the Corporation shall be eliminated to the fullest extent permitted
by the General Corporation Law of the State of Delaware, as so amended.

          TENTH:  The Corporation reserves the right to amend, alter, change or
          -----                                                                
repeal any provision contained in this Certificate of Incorporation, in the
manner now or hereafter prescribed by Statute, and all rights conferred upon
stockholders herein are granted subject to this reservation.

          IN WITNESS WHEREOF, the Corporation has caused this Restated
Certificate of Incorporation to be signed on its behalf

                                     - 3 -
<PAGE>
 
by Ronald J.  Brenner, its President, and attested by William J. Ryan, its
Secretary, this 15th day of October, 1987.

Attest:
                                 /s/ Ronald J. Brenner
                                 ------------------------------
                                            President
/s/ William J. Ryan
- -------------------------
Secretary

                                     - 4 -
<PAGE>
 
                           CERTIFICATE OF AMENDMENT
                                       TO
                          CERTIFICATE OF INCORPORATION

                             OF CYTOGEN CORPORATION
                           __________________________

                             Adopted in Accordance
                                    with the
                           Provisions of Section 242
                                     of the
                            General Corporation Law
                                     of the
                               State of Delaware
                           __________________________


          CYTOGEN CORPORATION, a corporation organized and existing under and by
the virtue of the General Corporation Law of the State of Delaware (the
"Corporation"), does hereby certify that amendments to the Certificate of
Incorporation of the Corporation amending (1) Article Fourth thereof to read in
its entirety as attached hereto as Exhibit A and (2) adding a new Article Eighth
(redesignating the presently designated Article Eighth to Article Tenth) thereof
to read in its entirety as Exhibit B have been duly adopted in accordance with
the provisions of Section 242 of the General Corporation Law of the State of
Delaware by a vote of Stockholders on these amendments, at the Annual Meeting of
Stockholders duly called and held on June 15, 1987 at which a quorum was
present.

          IN WITNESS WHEREOF, the Corporation has caused this certificate to be
signed on its behalf by Ronald J. Brenner,
<PAGE>
 
its President, and attested by its Secretary, this 10th day of July, 1987.

                                 CYTOGEN CORPORATION


                                 By:/s/ Ronald J. Brenner
                                    ---------------------------
                                    Ronald J. Brenner,
                                    President

Attest:



/s/ William J. Ryan
- -------------------------
William J. Ryan,
Secretary

                                     - 2 -
<PAGE>
 
                                                                       EXHIBIT A


          "FOURTH:   A.  Total Capital Stock.  The total number of shares of all
classes of capital stock which the Corporation shall have authority to issue is
twenty-seven million (27,000,000) shares, of which twenty-one million six
hundred thousand (21,600,000) shall be shares of Common Stock, the par value of
which is one cent ($.01) per share, amounting in the aggregate to two hundred
sixteen thousand dollars ($216,000), and five million four hundred thousand
(5,400,000) shall be shares of Preferred Stock, the par value of which is one
cent ($.01) per share, amounting in the aggregate to fifty-four thousand dollars
($54,000).

                     B.  Common Stock. Each holder of Common Stock shall be
entitled to one vote for each share of Common Stock held on all matters on which
holders of Common Stock shall be entitled to vote.

                     C.  Preferred Stock. The Board of Directors of the
Corporation is authorized to cause the Preferred Stock to be issued in one or
more series, with such voting powers, full or limited, or no voting powers, and
with such designations, preferences and relative, participating, optional or
other special rights and qualifications, limitations or restrictions thereof, as
shall be stated and expressed in the resolution or resolutions providing for the
issue of such stock adopted by the Board of Directors. The Board of Directors of
the Corporation is expressly authorized to adopt such resolution or resolutions
and to issue such stock as may be desirable.

                     D.  Residual Rights. All rights accruing to the outstanding
shares of the Corporation not expressly provided for to the contrary herein
shall be vested in the outstanding shares of Common Stock and Preferred Stock
pari passu."
- ---- -----  
<PAGE>
 
                                                                       EXHIBIT B


          "EIGHTH:  No director of the Corporation shall be personally liable to
the Corporation or its stockholders for monetary damages for breach of fiduciary
duty by such director as a director; provided, however, that this Article EIGHTH
shall not eliminate or limit the liability of a director to the extent provided
by applicable law (i) for any breach of the director's duty of loyalty to the
Corporation or its stockholders; (ii) for acts or omissions not in good faith or
which involve intentional misconduct or a knowing violation of law; (iii) under
Section 174 of the General Corporation Law of the State of Delaware; or (iv) for
any transaction from which the director derived an improper personal benefit.
If the General Corporation Law of the State of Delaware is amended after
approval by the stockholders of the Corporation of this Article EIGHTH to
further eliminate or limit the personal liability of directors, then the
liability of a director of the Corporation shall be eliminated to the fullest
extent permitted by the General Corporation Law of the State of Delaware, as so
amended."
<PAGE>
 
                           CERTIFICATE OF AMENDMENT
                                      OF
                         CERTIFICATE OF INCORPORATION
                                      OF
                              CYTOGEN CORPORATION

          Cytogen Corporation, a corporation organized and existing under and by
virtue of the Delaware General Corporation Law (the "Corporation"), for the
purpose of increasing the total number of authorized shares of common stock of
the Corporation pursuant to Section 242 of the Delaware General Corporation Law,
does hereby certify:

          FIRST:  That at a meeting of the Board of Directors of the Corporation
     held on February 1, 1991, the Board adopted resolutions:  (a) setting forth
     a proposed amendment to the Corporation's Restated Certificate of
     Incorporation, a copy of which certificate was filed in the office of the
     Delaware Secretary of State on October 19, 1987; (b) declaring the
     advisability of the amendment; and (c) directing the amendment be
     considered at the next annual meeting of the stockholders of the
     Corporation.

          SECOND:  That the amendment to the Restated Certificate of
     Incorporation set forth in the minutes of the Board of Directors is as
     follows:

          The FIFTH Article of the Restated Certificate of Incorporation is
     amended in its entirety to be and read as follows:

             "FIFTH      A.  Total Capital Stock.  The total number of 
              -----
          shares of all classes of capital stock which the Corporation 
          shall have authority
<PAGE>
 
          to issue is fifty million (50,000,000) shares, of which forty-four
          million six hundred thousand (44,600,000) shall be shares of Common
          Stock, the par value of which is one cent ($.01) per share, amounting
          in the aggregate to four hundred forty-six thousand dollars
          ($446,000), and five million four hundred thousand (5,400,000) shall
          be shares of Preferred Stock, the par value of which is one cent
          ($.01) per share, amounting in the aggregate to fifty-four thousand
          dollars ($54,000).

                    B.  Common Stock.  Each holder of Common Stock shall be
          entitled to one vote for each share of Common Stock held on all
          matters on which holders of Common Stock shall be entitled to vote.

                    C.  Preferred Stock.  The Board of Directors of the
          Corporation is authorized to cause the Preferred Stock to be issued in
          one or more series, with such voting powers, full or limited, or no
          voting powers, and with such designations, preferences and relative,
          participating, optional or other special rights and qualifications,
          limitations or restrictions thereof, as shall be stated and expressed
          in the resolution or resolutions providing for the issue of such stock
          adopted by the Board of Directors.  The Board of Directors of the
          Corporation is expressly authorized to adopt such resolution or
          resolutions and to issue such stock as may be desirable.

                    D.  Residual Rights.  All rights accruing to the outstanding
          shares of the Corporation not expressly provided for to the contrary
          herein shall be vested in the outstanding shares of Common Stock and
          Preferred Stock pari passu."
                          ---- -----  

          THIRD:  That at the Annual Meeting of Stockholders of the Corporation
     held on April 19, 1991, a majority of the outstanding stock entitled to
     vote therein was voted in

                                     - 2 -
<PAGE>
 
     favor of the aforesaid amendment.  No class was entitled to vote thereon as
     a class.

          FOURTH:  That the aforesaid amendment was duly adopted in accordance
     with the applicable provision of Section 242 of the Delaware General
     Corporation Law.

          IN WITNESS WHEREOF, the Corporation has caused this Certificate to be
signed by George W. Ebright, its President, and attested by William J. Ryan, its
Secretary, this 19th day of April 1991.


                                    /s/ George W. Ebright
                                    ------------------------------
                                    George W. Ebright, President

ATTESTED BY:


/s/ William J. Ryan
- ------------------------------
 William J. Ryan, Secretary

(SEAL)

                                     - 3 -
<PAGE>
 
                           CERTIFICATE OF AMENDMENT
                                      OF
                         CERTIFICATE OF INCORPORATION
                                      OF
                              CYTOGEN CORPORATION


               INCREASING THE TOTAL NUMBER OF AUTHORIZED SHARES
                  OF THE COMMON STOCK OF CYTOGEN CORPORATION


          CYTOGEN CORPORATION, a corporation organized and existing under and by
virtue of the General Corporation Law of the State of Delaware (the
"Corporation"), for the purpose of increasing the total number of authorized
shares of common stock of the Corporation pursuant to Section 242 of the
Delaware General Corporation Law,

          DOES HEREBY CERTIFY:

          FIRST:  That by unanimous action taken by the Board of Directors of
the Corporation on March 21, 1994 by written consent without a meeting and in
lieu of a special meeting of the Board of Directors, with full force and effect
as if adopted by the unanimous affirmative vote of the Board of Directors at a
duly constituted meeting, resolutions were duly adopted (a) setting forth a
proposed amendment to the Corporation's Restated Certificate of Incorporation,
as amended, a copy of which certificate was filed in the office of the Delaware
Secretary of State on October 19, 1987 and a copy of which certificate of
amendment thereto was filed in the office of the Delaware Secretary of State on
April 22, 1991; (b) declaring the advisability of the amendment; and (c)
directing the amendment be considered at the next annual meeting of the
stockholders of the Corporation.

          SECOND: That the amendment to the Restated Certificate of
Incorporation set forth in the minutes of the Board of Directors is as follows:

          The FIFTH Article of the Restated Certificate of Incorporation is
amended in its entirety to be and read as follows:

               "FIFTH:  A.  Total Capital Stock. The total number of shares of
                -----                                                         
     all classes of capital stock which the Corporation shall have the authority
     to issue is seventy-five million (75,000,000) shares, of which sixty-nine
     million six hundred thousand (69,600,000) shall be shares of Common Stock,
     the par value of which is one cent ($.01) per share, amounting in the
     aggregate to six
<PAGE>
 
     hundred ninety-six thousand dollars ($696,000), and five million four
     hundred thousand (5,400,000) shall be shares of Preferred Stock the par
     value of which is one ($.01) per share, amounting in the aggregate to
     fifty-four thousand dollars ($54,000).

               B.        Common Stock. Each holder of Common Stock shall be
     entitled to one vote for each share of Common Stock held on all matters on
     which holders of Common Stock shall be entitled to vote.

               C.        Preferred Stock. The Board of Directors of the
     Corporation is authorized to cause the Preferred Stock to be issued in one
     or more series, with such voting powers, full or limited, or no voting
     powers, and with such designations, preferences and relative,
     participating, optional or other special rights and qualifications,
     limitations or restrictions thereof, as shall be stated and expressed in
     the resolution or resolutions providing for the issue of such stock adopted
     by the Board of Directors. The Board of Directors of the Corporation is
     expressly authorized to adopt such resolution or resolutions and to issue
     such stock as may be desirable.

               D.        Residual Rights. All rights accruing to the outstanding
     shares of the Corporation not expressly provided for to the contrary herein
     shall be vested in the outstanding shares of Common Stock and Preferred
     Stock pari passu.
           ---- ----- 

          THIRD:  That at the Annual Meeting of Stockholders of the Corporation
held on May 24, 1994, a majority of the outstanding stock entitled to vote
therein was voted in favor of the aforesaid amendment. No class was entitled to
vote thereon as a class.

          FOURTH:  That the aforesaid amendment was duly adopted in accordance
with the applicable provisions of Section 242 of the Delaware General
Corporation Law.

          IN WITNESS WHEREOF, the Corporation has caused this Certificate to be
signed by Thomas J. McKearn, its President, and

                                     - 2 -
<PAGE>
 
attested by Mitchell G. Mackler, its Assistant Secretary, this the 24th day of
May 1994.



                              /s/ Thomas J. McKearn
                              -----------------------------------
                              Thomas J. McKearn, M.D., Ph.D.,
                              President


ATTESTED BY:


/s/ Mitchell G. Mackler
- -------------------------
Mitchell G. Mackler,
Assistant Secretary

(Seal)

                                     - 3 -
<PAGE>
 
                           CERTIFICATE OF AMENDMENT
                                      OF 
                         CERTIFICATE OF INCORPORATION 
                                      OF
                              CYTOGEN CORPORATION



     CYTOGEN CORPORATION, a corporation organized and existing under and by
virtue of the General Corporation Law of the State of Delaware (the
"Corporation"), for the purpose of increasing the total number of authorized
shares of common stock of the Corporation pursuant to Section 242 of the
Delaware General Corporation Law,

     DOES HEREBY CERTIFY:

     FIRST:  That by action taken at a meeting of the Board of Directors of the
Corporation on January 23, 1996, resolutions were duly adopted (a) setting forth
a proposed amendment to the Corporation's Restated Certificate of Incorporation,
as amended, a copy of which certificate was filed in the office of the Delaware
Secretary of State on October 19, 1987 and a copy of which certificates of
amendments thereto were filed in the office of the Delaware Secretary of State
on April 22, 1991 and May 27, 1994; (b) declaring the advisability of the
amendment; and (c) directing the amendment be considered at the next annual
meeting of the stockholders of the Corporation.

     SECOND: That the amendment to the Restated Certificate of Incorporation set
forth in the minutes of the Board of Directors is as follows:

     The FIFTH Article of the Restated Certificate of Incorporation of the
Corporation is amended in its entirety to be and read as follows:

             "FIFTH   A. Total Capital Stock. The total number of
              -----
        shares of all classes of capital stock which the corporation
        shall have the authority to issue is ninety-five million
        (95,000,000) shares, of which eighty-nine million, six
        hundred thousand (89,600,000) shall be shares of Common
        Stock, the par value of which is one cent ($.01) per share,
        amounting in the aggregate to eight hundred ninety-six
        thousand dollars ($896,000) and five million, four hundred
        thousand (5,400,000) shall be shares of Preferred Stock, the
        par value of which is one cent ($.01) per share, amounting in
        the 
<PAGE>
 
          aggregate to fifty-four thousand dollars ($54,000).

               B. Common Stock. Each holder of Common Stock shall be
          entitled to one vote for each share of Common Stock held on
          all matters on which holders of Common Stock shall be
          entitled to vote.

               C.  Preferred Stock. The Board of Directors of the
          Corporation is authorized to cause the Preferred Stock to be
          issued in one or more series, with such voting powers, full
          or limited, or no voting powers, and with such designations,
          preferences and relative, participating, optional or other
          special rights and qualifications, limitations or
          restrictions thereof, as shall be stated and expressed in
          the resolution or resolutions providing for the issue of
          such stock adopted by the Board of Directors. The Board of
          Directors of the Corporation is expressly authorized to
          adopt such resolution or resolutions and to issue such stock
          as may be desirable.

               D.  Residual Rights. All rights accruing to the
          outstanding shares of the Corporation not expressly provided
          for to the contrary herein shall be vested in the
          outstanding shares of Common Stock and Preferred Stock pari
                                                                 ---- 
          passu."
          -----  

     THIRD:  That at the Annual Meeting of Stockholders of the Corporation held
on May 22, 1996, a majority of the outstanding stock entitled to vote thereon
was voted in favor of the aforesaid amendment.  No class was entitled to vote
thereon as a class.

     FOURTH:  That the aforesaid amendment was duly adopted in accordance with
the applicable provisions of Section 242 of the Delaware General Corporation
Law.

                                     - 2 -
<PAGE>
 
     IN WITNESS WHEREOF, the Corporation has caused this certificate to be
signed by Thomas J. McKearn, as President and Chief Executive Officer, this 22nd
day of May, 1996.

                              CYTOGEN CORPORATION


                              By:/s/ Thomas J. McKearn
                                 --------------------------------
                                    Thomas J. McKearn
                                    President and
                                    Chief Executive Officer

                                     - 3 -

<PAGE>
 
        SECOND AMENDMENT OF THE LICENSE AGREEMENT EFFECTIVE MAY 30, 1993
        ----------------------------------------------------------------
            BETWEEN THE DOW CHEMICAL COMPANY AND CYTOGEN CORPORATION
            --------------------------------------------------------


This Second Amendment ("Second Amendment") to the License Agreement effective
May 30, 1993 ("License") between The Dow Chemical Company ("DOW") and CYTOGEN
Corporation ("CYTOGEN") is desired to expand the fields in which CYTOGEN is
licensed and to modify the terms of the first Amendment (effective September 5,
1995) to the License.

NOW, THEREFORE, DOW and CYTOGEN, in consideration of the commercial development
of the PRODUCT and EXPANSION OF LICENSED FIELD, the mutual covenants contained
herein, the adequacy and sufficiency of which are acknowledged, agree as
follows:

I.   The original Articles of the License are modified as follows:
     ------------------------------------------------------------ 

Article 1 -
- ---------  
     1.11   At line 4, after the word "humans" insert "or for the treatment of
            disease characterized by osteoblastic response in humans".

Article 6 -
- ---------  
     6.1.4, 6.1.7 and 6.1.8 are also to apply to this Second Amendment expanded
            indication for EXPANSION OF LICENSED FIELD.
Article 8 -
- ---------  
     8.1.3  Added as a new provision - "As an initial consideration for this
            Second Amendment, within ten (10) days from the Effective Date,
            CYTOGEN shall pay DOW One Thousand Dollars (US$1,000)."
     8.2 d) [    Information omitted and filed separately with the Commission
            under Rule 24b-2.       ]

<PAGE>
 
II.  The original Articles of the Amendment are modified as follows:
     -------------------------------------------------------------- 

Article 6 -
- ---------  

     6.19  Amend the Article to read: "File the NDA packaged, modified as
           needed, with the CANADIAN governmental authorities for PRODUCT for
           the FIELD using CYTOGEN's best efforts by October 31, 1996;"

     All other terms of the prior License and Amendment remain as stated
     therein.

IN WITNESS WHEREOF, the Parties have duly executed this Second Amendment in
duplicate by their appropriate authorized representative, effective as of the
last date set forth below ("Effective Date").

THE DOW CHEMICAL COMPANY              CYTOGEN CORPORATION


By     /s/Fred P. Corson              By     /s/Richard J. Walsh
  -----------------------------         -------------------------
Name   Fred P. Corson                 Name   Richard J. Walsh

Title  Vice President                 Title  Vice President
       Research and Development              Corporate Development

Date      May 17, 1996                Date      May 20, 1996
    ---------------------------           ------------------------

                                   -2-

<PAGE>
 
                   CYTOGEN CORPORATION 1995 STOCK OPTION PLAN

                                Amendment No. 1
                                ---------------

          Pursuant to the power reserved to it in Section 14 of the Cytogen
Corporation 1995 Stock Option Plan (the "Plan"), the Board of Directors of
Cytogen Corporation hereby amends the Plan as follows:

                                 1.  Section 1(a) is hereby amended and restated
in its entirety to read as follows:

          "    (a)  The purposes of this Plan are to further the interests of
          Cytogen Corporation (the "Company") and its Subsidiaries by retaining
          the services of persons now serving as officers and other employees
          and consultants of the Company and its Subsidiaries, attracting and
          retaining the services of persons capable of serving as officers,
          employees and consultants of the Company and its Subsidiaries and
          providing incentives for such employees and consultants to exert
          maximum efforts to promote the success of the Company and its
          Subsidiaries."

          2.   The definition of "Employee" in Section 2 is hereby amended and
restated in its entirety to read as follows:

          "'Employee' means any person employed by the Company or any of its
            --------                                                        
          Subsidiaries (including, without limitation, a person employed by the
          Company or any of its Subsidiaries who is also an officer or director
          of the Company or any of its Subsidiaries)."

          3.   The definition of "Plan" in Section 2 is hereby amended and
restated in its entirety to read as follows:

          "'Plan' means the Cytogen Corporation 1995 Stock Option Plan, as
            ----                                                          
          amended."

          4.   The definition of "Termination of Employment" in Section 2 is
hereby deleted in its entirety and replaced by the following:

          "'Termination of Service' means (a) the time when the employee-
            ----------------------                                      
          employer relationship between an Employee and the Company ceases to
          exist for any reason, or (b) the time when an officer who is not also
          an Employee ceases to be an officer of the Company for any reason or
          (c) the time when an Eligible Consultant ceases to be such a
          consultant for any reason, including, but not limited to, a
          termination by resignation, discharge,
<PAGE>
 
          death, Total Disability or retirement.  Any leave of absence taken
          with the consent of the Company for a period of not more than 90 days
          shall not be a Termination of Service, or if longer, so long as the
          optionee's right to reemployment with the Company is guaranteed by
          contract.  If the period of leave exceeds 90 days and if the right to
          reemployment is not guaranteed by contract, the Termination of Service
          will be deemed to occur on the 91st day of the leave."

          5.   The definition of "Total Disability" in Section 2 is hereby
amended and restated in its entirety to read as follows:

          "'Total Disability' means inability of an Employee or Eligible
            ----------------                                            
          Consultant to engage in any substantial gainful activity by reason of
          a medically determinable physical or mental impairment which can be
          expected to result in death or which has lasted or can be expected to
          last  for a continuous period of not less than 12 months.  All
          determinations as to the date and extent of disability of an Employee
          or Eligible Consultant will be made by the Committee."

          6.   Section 2 is hereby amended to add the following 
definition:

          "'Eligible Consultant' means a consultant providing services to, and
            -------------------                                               
          who is not an employee of, the Company or any of its Subsidiaries."

          7.   Section 2 is hereby amended to add the following 
definition:

          "'Subsidiary' means any corporation that, at the time in question is a
            ----------                                                          
          subsidiary corporation of the Company within the meaning of section
          424(f) of the Code."

          8.   Section 3(a) is hereby amended and restated in its entirety to
read as follows:

          "  (a)  This Plan shall be administered by a Committee, which shall be
          composed of not less than two Outside Directors who are also
          Disinterested Directors.  The Committee may, from time to time, adopt
          or rescind rules and regulations for carrying out the provisions and
          purposes of this Plan.  Subject to the express provisions of this
          Plan, the Committee shall have sole

                                     - 2 -
<PAGE>
 
          authority, in its absolute discretion, to determine which officers,
          Employees and Eligible Consultants shall receive Options, the time
          when Options shall be granted, the terms and provisions of the Options
          (which may differ from one another) and to do everything necessary or
          appropriate to administer this Plan, including, without limitation,
          interpreting the provisions of this Plan and the Options.  All
          determinations made by the Committee with respect to this Plan and the
          Options shall be final, binding and conclusive."

          9.   Section 4(a) is hereby amended and restated in its entirety to
read as follows:
 
          "  (a)  Options may be granted under this Plan only to persons who at
          the Date of Grant either (i) are officers, Employees or Eligible
          Consultants of the Company or any of its Subsidiaries or (ii) have
          agreed to become officers, Employees or Eligible Consultants of the
          Company or any of its Subsidiaries, and, in either case, are
          determined by the Committee to be of substantial importance to the
          Company or any of its Subsidiaries."

          10.  Section 4(b) is hereby amended and restated in its entirety to
read as follows:

          "    (b)  Options granted to persons who are not yet officers,
          Employees or Eligible Consultants at the Date of Grant may not be
          exercised until the optionee has become an officer, Employee or
          Eligible Consultant, and shall expire if the optionee fails to
          commence service as an officer, Employee or Eligible Consultant within
          six months (or such other period as the Committee may determine) after
          the Date of Grant."

          11.  Section 4(c) is hereby amended and restated in its entirety to
read as follows:

          "    (c)  Incentive Stock Options may be granted only to persons who
          are Employees at the Date of Grant, and only on such terms as are
          provided in paragraphs 6, 7 and 8 hereof."

          12.  Section 4(d) is hereby amended and restated in its entirety to
read as follows:

                                     - 3 -
<PAGE>
 
          "  (d)  No Employee or Eligible Consultant to whom Options may be
          granted under this Plan may be granted Options to purchase more than
          200,000 shares in any one calendar year."

          13.  Section 5(a) is hereby amended and restated in its entirety to
read as follows:

          "    (a)  Subject to any adjustment as provided in paragraph 9, the
          maximum number of shares of Common Stock as to which Options may be
          granted under this Plan is 4,502,635 shares reduced by the number of
          outstanding options granted under the Cytogen Corporation 1989
          Employee Stock Option Plan (the "1989 Plan") that are exercised after
          the effective date of this Plan. If any Option expires or is cancelled
          or surrendered without being exercised in full, the number of shares
          as to which the Option is not exercised will once again become shares
          as to which new Options may be granted.  The Common Stock which is
          issued on exercise of Options may be authorized but unissued shares or
          shares which have been issued and reacquired by the Company."

          14.  Section 5(b) is hereby amended and restated in its entirety to
read as follows:

          "    (b)  For administrative purposes only, the Committee shall
          establish an account indicating the number of shares of Common Stock
          as to which Options may then be granted under this Plan (the "Current
          Account"), and the Committee may issue Options only with respect to
          the shares of Common Stock available for grant as set forth in the
          Current Account.  The Current Account shall contain the number of
          shares available for grant calculated as follows: (a) 4,502,635, minus
          (b) the number of shares of Common Stock subject to options granted
          under the 1989 Plan that are exercised after the effective date of
          this Plan, minus (c) the number of shares of Common Stock subject to
          outstanding options granted under the 1989 Plan and this Plan, plus
          (d) the number of shares of Common Stock subject to outstanding
          options granted under the 1989 Plan and/or this Plan that expire, are
          cancelled or surrendered without being exercised in full."

          15.  Section 6(a) is hereby amended and restated in its entirety to
read as follows:

                                     - 4 -
<PAGE>
 
          "    (a) Subject to paragraph 4(d), the Committee will have complete
          discretion to determine when, and to which officers or other Employees
          or Eligible Consultants, Options are to be granted, the number of
          shares of Common Stock to which Options granted to each officer or
          other Employee or Eligible Consultant, will relate, whether and to
          what extent Options granted to an officer or other Employee or
          Eligible Consultant, will be Incentive Stock Options or Non-Qualified
          Options and, subject to the provisions of paragraphs 7 and 8, the
          Exercise Price and the term of each Option. The Committee may, in its
          discretion at the time of granting the Option, provide that the
          Exercise Price may be paid in cash, by the surrender of Common Stock,
          by an interest-bearing promissory note, or by other means; subject,
          however, to any requirements of applicable law which may limit the
          type or amount of such non-cash consideration. If payment by
          promissory note is permitted: (i) the optionee shall be required to
          make a cash payment upon exercise of the Option of not less than 20%
          of the Exercise Price; (ii) the note shall provide for full recourse
          against the maker; and (iii) the note shall be payable in full prior
          to its stated maturity upon the optionee's Termination of Service for
          any reason other than death or Total Disability."

          16.  Section 7(f) is hereby amended and restated in its entirety to
read as follows:

          "    (f) Termination of Service of Holder of Option Other Than Because
          of Total Disability or Death. If there is a Termination of Service of
          a person to whom an Option has been granted, other than by reason of
          the person's death or Total Disability, each Option held by the person
          may be exercised (if otherwise exercisable) until the earlier of (i)
          the end of the three-month period immediately following the date of
          the Termination of Service, (ii) the expiration of the term specified
          in the Option, or (iii) such earlier time as may be determined by the
          Committee at the time of granting the Option."

          17.  Section 7(g) is hereby amended and restated in its entirety to
read as follows:

          "    (g) Total Disability of Holder of Option. If there is a
          Termination of Service of a person to whom an Option has been granted
          by reason of his or her

                                     - 5 -
<PAGE>
 
          Total Disability, each Option held by the person may be exercised (if
          otherwise exercisable) until the earlier of (i) the end of the one-
          year period immediately following the date of the Termination of
          Service, (ii) the expiration of the term specified in the Option, or
          (iii) such earlier time as may be determined by the Committee at the
          time of granting the Option."

          18.  Section 7(h) is hereby amended and restated in its entirety to
read as follows:

          "    (h)  Death of Holder of Option.  If there is a Termination of
          Service of a person to whom an Option has been granted by reason of
          his or her death, or a former officer or Employee or Eligible
          Consultant dies following the date of his or her Termination of
          Service but at a time when an Option still would be exercisable by
          that person but for the death of the person, each Option held by the
          person at the time of his or her death may be exercised by the person
          or persons to whom the Option passed by will or by the laws of descent
          and distribution (but by no other persons) until the earlier of (i)
          the end of the one-year period immediately following the date of death
          (or such other period as may be determined by the Committee at the
          time of granting the Option), (ii) the expiration of the term
          specified in the Option, or (iii) if the death occurs after the
          Termination of Service, the end of the period in which the Option
          could be exercised under paragraph 7(f) or (g)."

          19.  Section 14 is hereby amended and restated in its entirety to read
as follows:

          "14. Amendment of the Plan.

               The Board of Directors may at any time and from time to time
          modify or amend this Plan in any respect effective at any date the
          Board of Directors determines; provided, that without the approval of
          the stockholders of the Company the Board of Directors may not, (i)
          except as provided in paragraph 9, increase the maximum number of
          shares of Common Stock which may be issued on exercise of Options
          granted under this Plan; (ii) change the categories of persons
          eligible to receive Options; (iii) increase the per-optionee limit
          specified in paragraph 4(d), or (iv) take any other action requiring
          the approval of the stockholders of the Company in order to maintain
          the exemption

                                     - 6 -
<PAGE>
 
          available under Rule 16b-3 (or any similar rule) of the Securities and
          Exchange Commission.  No modification or amendment of this Plan will,
          without the consent of the holder of an outstanding Option, adversely
          affect the holder's rights under that Option."

          20.  This Amendment No. 1 to the Plan shall be effective only after
approval of a majority of the Company's stockholders as set forth in Section 14.

                                     - 7 -
<PAGE>
 
          To record the adoption of this Amendment No. 1, the Company has caused
its authorized officers to affix its corporation name and seal this 22nd day of
May, 1996.

CORPORATE SEAL                CYTOGEN CORPORATION



Attest:/s/ T. Jerome Madison  By: /s/ Thomas J. McKearn
       ---------------------      -----------------------

                                     - 8 -

<PAGE>
 
                   CYTOGEN CORPORATION 1988 STOCK OPTION PLAN
                           FOR NON-EMPLOYEE DIRECTORS

                                Amendment No. 2
                                ---------------

     Pursuant to the power reserved to it in Section 12 of the Cytogen
Corporation 1988 Stock Option Plan for Non-Employee Directors (the "Plan"), the
Board of Directors of Cytogen Corporation hereby amends the Plan as follows:

     1.  The first sentence of Section 5 is hereby amended and restated to read
as follows:

     "The maximum number of shares of Common Stock as to which Options may
     be granted under this Plan is 300,000 shares."

     2.   This Amendment No. 2 to the Plan shall be effective only after
approval of a majority of the Company's stockholders as set forth in Section 12.

     To record the adoption of this Amendment No. 2, the Company has caused its
authorized officers to affix its corporation name and seal this 22nd day of May,
1996.


CORPORATE SEAL                         CYTOGEN CORPORATION



Attest: /s/ T. Jerome Madison          By: /s/ Thomas J. McKearn
        ---------------------              -----------------------

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM "THE
CONSOLIDATED BALANCE SHEETS AS OF JUNE 30, 1996 AND THE CONSOLIDATED STATEMENTS
OF OPERATIONS FOR THE SIX-MONTH PERIOD ENDED JUNE 30, 1996 AND IS QUALIFIED IN
ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS
</LEGEND>
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               JUN-30-1996
<CASH>                                      20,373,000
<SECURITIES>                                 5,070,000
<RECEIVABLES>                                1,131,000
<ALLOWANCES>                                 (536,000)
<INVENTORY>                                    300,000
<CURRENT-ASSETS>                               753,000
<PP&E>                                      16,918,000
<DEPRECIATION>                            (11,684,000)
<TOTAL-ASSETS>                              33,875,000
<CURRENT-LIABILITIES>                        5,343,000
<BONDS>                                              0
                                0
                                          0
<COMMON>                                       481,000
<OTHER-SE>                                  24,626,000
<TOTAL-LIABILITY-AND-EQUITY>                33,875,000
<SALES>                                        742,000
<TOTAL-REVENUES>                             2,751,000
<CGS>                                                0
<TOTAL-COSTS>                                1,755,000
<OTHER-EXPENSES>                            12,617,000
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                             225,000
<INCOME-PRETAX>                           (11,079,000)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                       (11,079,000)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                              (11,079,000)
<EPS-PRIMARY>                                   (0.23)
<EPS-DILUTED>                                        0
        

</TABLE>


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