CYTOGEN CORP
8-K, 1997-07-08
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549


                                   FORM 8-K

                                CURRENT REPORT

                        Pursuant to Section 13 or 15(d)
                    of the Securities Exchange Act of 1934


Date of Report (Date of earliest event reported)     July 8, 1997
                                                --------------------

                              Cytogen Corporation
- --------------------------------------------------------------------------------
             (Exact name of registrant as specified in its charter)


            Delaware            1-14879           22-2322400
- --------------------------------------------------------------------------------
         (State or other    (Commission         (IRS Employer
         jurisdiction of      File No.)      Identification No.)
          incorporation)


            600 College Road East, CN 5308, Princeton, NJ 08540-5308
- --------------------------------------------------------------------------------
        (Address of principal executive offices)              (Zip Code)


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


                                 Not Applicable
- --------------------------------------------------------------------------------
         (Former name or former address, if changed since last report)
<PAGE>
 
Item 5.  Other Events.
         -------------

The Registrant has amended its request for confidential treatment for
information contained in certain exhibits filed with its Quarterly Report on
Form 10-Q for the Quarter ended September 30, 1996 and has attached to this
Current Report on Form 8-K those exhibits reflecting its amended request.

Item 7.  Financial Statements and Exhibits.
         ----------------------------------

         (c) Exhibits:
 
         10.3-  Joint Development and Operating Agreement among CYTOGEN
                Corporation, Elan Corporation, plc. and Targon Corporation dated
                September 26, 1996.*
 
         10.4-  Marketing and Co-Promotion Agreement between CYTOGEN Corporation
                and C.R. BARD, Inc., effective August 1, 1996.*

*  The Registrant 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.

                                     - 2 -
<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



                                  By:   /s/ Thomas J. McKearn
                                      ----------------------------------
                                      Thomas J. McKearn
                                      Chairman of the Board, President
                                       and Chief Executive Officer
    


Date:  July 8, 1997


                                     - 3 -
<PAGE>
 
                               INDEX TO EXHIBITS

Exhibit No.     Description                                             Page
- --------------------------------------------------------------------------------

      10.3-     Joint Development and Operating Agreement among
                CYTOGEN Corporation, Elan Corporation, plc. and
                Targon Corporation dated September 26, 1996.
 
      10.4-     Marketing and Co-Promotion Agreement between
                CYTOGEN Corporation and C.R. BARD, Inc.,
                effective August 1, 1996.

                                     - 4 -

<PAGE>

                                                                 Exhibit 10.3
 
                  JOINT DEVELOPMENT AND OPERATING AGREEMENT 

  

                             ELAN CORPORATION, PLC

                      
                                      AND

                             
                              CYTOGEN CORPORATION

                              
                                      AND

                              
                              TARGON CORPORATION


                              SEPTEMBER 26, 1996

<PAGE>

 
     THIS JOINT DEVELOPMENT AND OPERATING AGREEMENT is dated September 26, 1996 
among CYTOGEN CORPORATION, a Delaware corporation, having its principal place of
business at 600 College Road East, Princeton, New Jersey 08540 (together with 
its Subsidiaries and Affiliates (each as defined below), " Cytogen"); ELAN 
CORPORATION, PLC, a public limited company incorporated under the laws of 
Ireland, having its principal place of business at Monksland, Athlone, County 
Westmeath, Ireland (together with its Subsidiaries and Affiliates, "ELAN"); and 
TARGON CORPORATION, a Delaware corporation, having its principal place of 
business at 600 College Road East, Princeton, New Jersey 08540 (the "Company"). 
Capitalized terms not otherwise defined herein are defined in Section 1.1 
hereof.

                                   RECITALS:

          A.  The Company was formed on September 25, 1996 for the purpose of 
conducting research, development and commercialization of the ATS Compounds and
the Cytogen Compounds related activities. The Company has issued 1,000,000 
shares of its Common Stock to Cytogen on the date hereof, constituting 100% of 
the Company's issued and outstanding share capital (other than the Management 
Shares). In connection with the closing of the Securities Purchase Agreement, 
Cytogen has granted to Elan International Services, Ltd. ("EIS"), a Bermuda 
corporation and wholly-owned subsidiary of Elan Corporation, plc, the Elan 
Exchange Right, as provided in the Securities Purchase Agreement. Pursuant to 
the Elan Exchange Right, the Company has granted to EIS the option to exchange 
all of the issued and outstanding shares of the Cytogen's Series A preferred 
Stock initially for 500,000 shares of Common Stock of the Company, initially
representing 50% of the share capital of the Company (other than Management
Shares), subject to adjustment as described in the Securities Purchase
Agreement.

          B.  Cytogen and Elan have agreed to cooperate in the establishment and
management of the Company for development of specific pharmaceutical compounds 
(biological and otherwise) incorporating the technologies developed by the 
Company, Cytogen, Elan and/or Advanced Therapeutic Systems, Ltd., a Bermuda 
corporation ("ATS"), and their sale and supply, and desire that such activities
be undertaken through the Company, and for this purpose Cytogen and EIS have
agreed to participate as holders of the Common Stock of the Company (in the case
of EIS, through exercise, in EIS's discretion, of the Elan Exchange Right), for
the purposes and on the terms set out in this Agreement. In connection with the
forgoing, the Company shall acquire certain Technology and, in connection
therewith, shall agree to make certain payments to Cytogen, Elan and ATS.

          C.  The Company and Cytogen and Elan desire to set forth in the 
Agreement certain provisions relating to (1) the research, development and 
commercialization work described above and (2) the operations of the business of
the Company.

<PAGE>
 
                                  AGREEMENT:

                 ACCORDINGLY, IT IS HEREBY AGREED AS FOLLOWS:


                                   ARTICLE I


                                  DEFINITIONS

     1.1.  In this Agreement, the following words and meanings shall, where not 
inconsistent with the context, have the following meanings respectively.

           "Additional Compounds" means any compound or formulation now or
hereafter owned by the Company or in which the Company has any development,
marketing or similar rights, other than the Compounds utilizing the Cytogen
Technology or the Elan Technology.

           "Affiliate" means any Person other than the Company controlling,
controlled or under the common control of Elan or Cytogen, as the case may be.
For the purpose of this definition, "control" shall mean direct or indirect
ownership of 40% or more of the stock or shares entitled to vote for the
election of directors or the ability, by contract or agreement or otherwise, to
direct the management and affairs of a Person.

           "Agreed" means agreed by all Parties and confirmed in writing.

           "Agreement" means this agreement (which expression shall be deemed to
include the Recitals, the Schedules and Appendices hereto).

           "Articles" means the certificate or articles of incorporation and 
by-laws of the Company in the form attached as Exhibit D hereto.
                                               ---------

           "ATS Compounds" means the Compounds described in Exhibit B hereto, 
                                                            ---------
captioned EL530 and EL532, together with any other compounds hereafter 
contributed or transferred to the Company by ATS (in the form of the ATS 
Transfer Agreement executed on the date hereof), or Elan.

           "ATS Transfer Agreement" means the agreement dated the date hereof
between ATS and the Company pursuant to which ATS has transferred the ATS
Compounds and the related Intellectual Property to the Company.

           "Business" means the business of the Company as described in Article
II and subject to the provisions of Article IV, such other business as the
Parties may agree from time to time in writing should be carried on by the
Company.

           "Business Plan" means the Company's business plan in the form
attached hereto as Exhibit A or in such other form as shall be agreed to from
                   --------- 
time to time in writing by Cytogen and Elan, in conjunction with the Research
and Development Programs, for the conduct of the Business of the Company for
each Financial Year for the duration of this Agreement, which shall include, in
particular, details of the planned research and development expenses to be

                                      -2-
 








<PAGE>
 
incurred in that Financial Year, which of the Shareholders shall be responsible 
for the relevant research and development expenditure, and how such expenses 
shall be funded.

          "Common Stock" means the common stock, $01 par value per share, of the
Company.

          "Compounds" means the ATS Compounds and the Cytogen Compounds,
together with any Additional Compounds hereafter acquired by the Company from
Cytogen, ATS, Elan or any other Person, or developed by the Company.

          "Cytogen Compounds" means the Compounds described in Exhibit C hereto,
                                                               ---------
consisting of Prostatec(TM) and PSMA, together with any other compounds 
hereafter contributed or transferred to the Company by Cytogen.

          "Cytogen Directors" means the Directors designated by Cytogen pursuant
to the terms hereof and holding office from time to time.

          "Cytogen Technology" means any intellectual property, know-how, trade
secrets, patents or patent rights or other rights relating to the Cytogen
Compounds owned by Cytogen and transferred to the Company pursuant to the
Cytogen Transfer Agreement.

          "Cytogen Transfer Agreement" means the agreement dated the date hereof
between Cytogen and the Company pursuant to which Cytogen has transferred the
Cytogen Compounds and the related Intellectual Property to the Company.

          "Directors" means the Cytogen Directors and the Elan Directors from
time to time and any other Director agreed to by the Cytogen Directors and the
Elan Directors from time to time.

          "Elan Directors" means the Directors designated by Elan pursuant to
the terms hereof and holding office from time to time.

          "Elan Exchange Right" means the right granted by Cytogen to EIS, as
set forth in the Securities Purchase Agreement, to acquire shares of Common
Stock of the Company from Cytogen, as provided for in the Securities Purchased
Agreement.

          "Elan Technology" means any intellectual property, know-how, trade
secrets, patents or patent rights or other rights relating to the ATS Compounds
owned by Elan or ATS and transferred to the Company pursuant to the ATS Transfer
Agreement.

          "FDA" means the U.S. Food and Drug Administration or any successor U.S
federal agency.

          "Field" means the [INFORMATION OMITTED AND FILED SEPARATELY WITH THE
COMMISSION UNDER RULE 24b-2.]

          "Financial Year" means initially, September 1, 1996 through December
31, 1996 and thereafter each year commencing on January 1 and expiring on
December 31 of each year.

                                      -3-
<PAGE>
 
           "Independent Third Party" means any Person other than Elan, Cytogen,
ATS or the Company, or any Affiliate of any such Person.

           "INDA" means any investigational new product application in relation
to a Product or Compound.

           "Loan" means any loan(s) advanced from time to time by any of the 
Shareholders to the Company.

           "Management Shares" means Shares issued or issuable to directors,
officers or other Persons pursuant to such plans, options, warrants,
arrangements and/or understandings as shall be satisfactory to the Shareholders.

           "NDA" means a new drug application.

           "Net Sales" means the [INFORMATION OMITTED AND FILED SEPARATELY WITH 
THE COMMISSION UNDER RULE 24b-2]

           "Party" means Elan, Cytogen or the Company, as the case may be; 
"Parties" means more than one Party.

           "Person" means an individual, partnership, corporation, business
trust, joint stock company, trust, unincorporated association, joint venture, or
other entity of whatever nature.

           "PLA" means Product License Application.

           "Prime" means the prime or base rate established from time to time by
Morgan Guaranty Trust Company in New York.

           "Product(s)" means depending on the context one or more formulations 
of the Compounds or based, in whole or in part, on the Technology and developed
by or on behalf of the Company.

           "Research and Development Programs" mean(s), depending on the
context, one or more programs of research and development work being conducted
or to be conducted by Cytogen and/or Elan for and on behalf of the Company which
have been devised by the Research Committee and approved by the Management
Committee.

           "Securities Purchase Agreement" means the Securities Purchase 
Agreement dated as of the date hereof between Cytogen and EIS, pursuant to which
Cytogen has agreed to issue to EIS and EIS has agreed to purchase from Cytogen
the securities set forth therein, including,

                                      -4-
<PAGE>
 
without limitation, the Series A Preferred Stock of Cytogen, in connection with 
which Cytogen has granted to EIS the Elan Exchange Right.

           "Shares" means any outstanding shares of Common Stock.

           "Shareholder" means Cytogen or Elan for so long as such Party or its 
Affiliates owns at least 10% of the aggregate shares or, in the case Elan, has 
the right to acquire such Shares in connection with the Elan Exchange Right; 
"Shareholders" means both of Cytogen and Elan together.

           "Subsidiary" of any Person means any other Person at least 50% of the
capital stock is owned by such first Person.

           "Supply Agreements" means one or more Manufacture and Supply 
Agreements to be entered into by Elan and/or Cytogen, on the one hand Company, 
on the other hand, pursuant to the terms hereof to facilitate commercial 
development and exploitation of Compounds or Products.

           "Technology" means, collectively, the Cytogen Technology, the Elan 
Technology and any intellectual property, know-how, trade secrets, patents or 
patent rights or other rights relating to the Compounds and, developed or 
acquired by or on behalf of the Company.

           "Territory" means all of the countries of the world.

           "Transfer Agreements" means the ATS Transfer Agreement and the
Cytogen Transfer Agreement.

     1.2.  Words importing the singular shall include the plural and vice versa.

     1.3.  Unless the context otherwise requires, reference to an article, 
paragraph, provision, clause or schedule is an article, paragraph, provision, 
clause or schedule of or to this Agreement.

     1.4.  Reference to a statute or statutory provision includes a reference to
it as from time to time  amended, extended or re-enacted.

     1.5.  The headings in this Agreement are inserted for convenience only and
do not affect its construction.


                                  ARTICLE II

                            THE COMPANY'S BUSINESS 

     2.1.  The primary object of the Company and any Subsidiaries is to carry on
the business of the Field in the Territory and to achieve the objectives set out
in this Agreement.

                                      -5-
<PAGE>
 
     2.2.   On the date hereof, as provided in Article V hereof, (a) Cytogen is
paying to the Company $20 million (the "Initial Capital"), in consideration of
all of the Shares. The Company hereby agrees that, unless consented to by the
Shareholders, it shall not issue any Shares other than Management Shares. Each
of the Shareholders agrees that it shall use its best efforts to cause the
Company to be bound by the provisions of this Agreement. Except as the
Shareholders may otherwise agree in writing and except as may be provided in
this Agreement, the Business Plan or any Supply Agreements, the Shareholders
shall exercise their powers in relation to the Company so as to ensure that the
business is carried on in a proper and prudent manner.

     2.3.   Each of Cytogen and Elan shall use all reasonable and proper means
at its disposal and within its power to maintain, extend and improve the
Business of the Company, within the limits of this Agreement, and to further the
reputation and interests of the Company.

     2.4.   The central management and control of the Company shall be exercised
at the principal place of business of the Company and shall be vested in the
Directors and such persons as they may delegate the exercise of their powers in
accordance with this Agreement. The Shareholders shall use their best endeavors
to ensure that the Company is treated as resident for taxation in such
jurisdiction as the Directors shall determine and that the right to use of the
Technology shall, to the maximum extent practicable, be owned and held by the 
Company, or its Affiliate, or its designee.

     2.5.   Each of the Shareholders hereby confirms that in the event of a
dispute arising between the Company and a Shareholder, the Directors appointed
by that Shareholder shall consent to any action or proceedings taken or
initiated by the Company against that Shareholder to resolve the dispute.


                                  ARTICLE III

                            ARTICLES OF THE COMPANY

     3.1.   In the event of any ambiguity or conflict arising between the terms
of this Agreement and those of the Company's Articles, the terms of this
Agreement shall prevail as between the Shareholders.

     3.2.   Subject to Section 3.1, each of the Parties hereto undertakes with 
each of the other Parties fully and promptly to observe and comply with the 
provisions hereof to the intent and effect that each and every provision thereof
shall be enforceable by the Parties hereto.


                                  ARTICLE IV
 
                                  WARRANTIES

     4.1.   The Company warrants to the Shareholders that the Recitals are true
and correct in every respect insofar as they relate the Company, and that prior
to the date hereof the

                                      -6-
<PAGE>
 
Company has neither traded nor incurred any liabilities or obligations of any 
nature whatsoever other than those imposed on the Company by virtue of its 
incorporation and this Agreement.

     4.2.   Elan and Cytogen each warrants and undertakes to the other that the 
Shares to be acquired by it in the Company, as provided herein, will be acquired
for its own absolute beneficial ownership and not on behalf of any other Person.

     4.3.   Elan and Cytogen each warrants and undertakes to the other (with 
respect to Elan Corporation, plc and Cytogen Corporation, respectively) that 
except as disclosed in writing to each other prior to the execution of this 
Agreement:

            (a) it is duly incorporated under the laws of its place of 
incorporation;

            (b) it has full authority and capacity to enter into and perform its
obligations under this Agreement (having obtained all requisite corporate and
governmental approvals);

            (c) it is not engaged in any litigation or arbitration, or in any 
dispute or controversy reasonably likely to lead to litigation, arbitration or 
any other proceeding, which would materially affect the validity of this 
Agreement, such Party's fulfillment of its respective obligations under this 
Agreement or the business of the Company as contemplated herein; and

            (d) that this Agreement has been fully authorized, executed and 
delivered by it and that it has full legal right, power and authority to enter 
into and perform this Agreement, which constitutes a valid and binding agreement
between the Parties.

                                   ARTICLE V

                                    CLOSING

     5.1.   The closing of the transactions contemplated hereby shall occur on
the date hereof, simultaneously with the execution and delivery of this
Agreement and the Securities Purchase Agreement, at the offices of counsel to
Elan in New York, New York, or at such other place as the Shareholders shall
agree upon.

     5.2.   At the closing, each of the parties hereto shall take or (to the 
extent that the same is within such Person's powers) cause to be taken the 
following steps at Directors' and Shareholder's meetings of the Company, or such
other meetings or closing, as appropriate:

            (a) the adoption by the Company of the Articles in the form attached
hereto as Exhibit D and the designation and appointment of the initial 
          ---------
Directors;

            (b) the consummation of the transactions contemplated by the 
Securities Purchase Agreement, including without limitation, the issuance by 
Cytogen to EIS of the common stock and Series A Preferred Stock of Cytogen 
issuable to EIS thereunder;

                                      -7-
<PAGE>
 
            (c) the issuance of the Shares to Cytogen and the appointment of the
initial Directors of the Company, as agreed to on the date hereof by Cytogen and
Elan;

            (d) the payment by Cytogen to the Company of the Initial Capital;

            (e) the execution by the Company, on the one hand, and ATS, Cytogen 
and EPRC, on the other hand, of the Transfer Agreements; and

            (f) the delivery of such additional documents and instruments, and 
opinions of counsel and other Persons, as shall be customary in the
circumstances and reasonably requested by each of the Parties.


                                  ARTICLE VI

                                 CONTRIBUTIONS

     6.1    The Shareholders and the Company acknowledge and agree that the 
financial requirements of the Company will be borne by the Company, initially 
from the Initial Capital or such other basis as may be agreed by the 
Shareholders, in their sole discretion, whether by way of providing cash or 
technical know-how.

     6.2    Cytogen has contributed to the Company on the date hereof the 
Cytogen Compounds and the Cytogen Technology (pursuant to the Cytogen Transfer 
Agreement), and ATS has contributed to the Company on the date hereof the Elan 
Technology and ATS Compounds (pursuant to the ATS Transfer Agreement).

     6.3.   The Shareholders agree that any further financing of the Company 
required in respect of any research and development expenditure to be incurred 
by the Company in excess of the contributions pursuant to Section 6.2 shall be 
borne as the Shareholders may hereafter agree; it being understood that neither 
Cytogen nor Elan shall have any obligation to contribute additional funds absent
its specific agreement in respect thereof.

                                  ARTICLE VII

             MANAGEMENT AND DIRECTION OF RESEARCH AND DEVELOPMENT

     7.1    The Company's Board of Directors initially shall consist of (a)
three Directors appointed by Cytogen, (b) three Directors appointed by Elan, and
(c) one independent Director (i.e., a Person who is not affiliated with either
Cytogen or Elan). Such provisions shall remain in effect until the earlier to
occur of the termination of this Agreement and the initial public offering of
equity securities of the Company in a registered offering under the Securities
Act of 1933 and the registration of the Common Stock under the Securities Act of
1934 (an "IPO"); provided, that at such time that Elan or Cytogen owns, directly
or indirectly, fewer than 20% of

                                      -8-
<PAGE>
 
the Shares, such Shareholder's (but not the other Shareholder's) right to 
appoint Directors shall expire.

     7.2. The Directors shall appoint a management committee (the "Management 
Committee") to exercise certain of their functions in accordance with their 
right to delegate such powers pursuant to the Articles.  The Management 
Committee will consist of two individuals, one of whom initially shall be 
nominated by Elan and one of whom initially shall be nominated by Cytogen.  Each
of the Shareholders shall be entitled to remove any of its nominees to the 
Management Committee and appoint a replacement in place of any nominee so 
removed.

     7.3. The Management Committee shall appoint a research committee (the
"Research Committee"). The Research Committee shall consist of two individuals,
one of whom initially shall be nominated by Elan and one of whom initially shall
be nominated by Cytogen. Each of the Shareholders shall be entitled to remove
its nominee to the Research Committee and appoint a replacement in place of any
nominee so removed. The number of individuals on the Research Committee shall be
altered if agreed to by the Management Committee.

     7.4. The Management Committee shall be responsible for, among other
things, devising implementing and reviewing strategy for the Business and, in 
particular, devising the Company's strategy for research and development in 
relation to the Field and to monitor and supervise the implementation of the 
Company's strategy for research and development.

     7.5. The Management Committee shall report all significant developments to 
the Directors and the Shareholders on the occurrence thereof and, in addition, 
shall report at quarterly intervals to the Directors and the Shareholders.  In 
the event of an irreconcilable dispute or deadlock among the members of the 
Management Committee, the provisions of Article XXIII shall apply.

     7.6. The Research Committee shall be responsible for the implementation of 
the Research and Development Programs for the Company and shall meet at regular 
intervals to monitor the progress of the research and development programs and 
to report on its progress to the Management Committee.  In the event of any 
dispute among the Research Committee, the Research Committee shall refer such 
dispute to the Management Committee whose decision on the dispute shall be 
binding on the Research Committee.  If the Management Committee fail to reach a 
decision, the provisions of Article XXIII shall apply.

     7.7. The Company shall, in the first instance, solicit Cytogen or Elan to 
provide such research and development services as may reasonably be required by
the Company, upon such terms and conditions as may be subsequently agreed by the
Company, on the one hand, and Cytogen or Elan, on the other hand.

     7.8. The Company shall pay Elan and Cytogen for any research and
development work carried out by them on behalf of the Company, as provided in
the Business Plan and otherwise agreed to by the Management Committee, on the
one hand, and Cytogen or Elan, on the other hand, subject to the proper vouching
of research and development work and expenses. The

                                      -9-












<PAGE>
 
payments by the Company to Elan and Cytogen shall be calculated by reference to
the [INFORMATION OMITTED AND FILED SEPARATELY WITH THE COMMISSION UNDER RULE 
24b-2.]

     7.9.   In consideration of the patent rights granted, or which hereafter
may be granted, by the Parties regarding the work to be completed hereunder in
connection with the development of the Compounds and the Products, the Company
shall pay to Cytogen and Elan the following amounts from time to time. This is 
subject to the availability of sufficient funds in the good faith determination 
of the Directors, or such other amounts (or at such other rates) as the 
Shareholders shall agree:

            (a)  At such time, if any, that any [*], the Company shall, within 
120 days thereafter, pay to each of Cytogen and Elan a license fee of [*];

            (b)  At such time, if any, that the Company or any other Person 
(including Cytogen and/or Elan) [*], the Company shall, within 120 days 
thereafter, pay to each of Cytogen and Elan a license fee of [*]; and

            (c)  From and after the time that the Company or any other Person 
(including Cytogen and/or Elan) first commercializes any Products or any other 
products acquired or developed by the Company in the Territory, the Company 
shall thereafter pay to each of Cytogen and Elan an amount equal to [*] of the 
Net Sales derived by the Company from such commercialization. At such time, the 
Company and each of Cytogen and Elan shall negotiate and reasonably agree to 
such provisions relating to terms and timing of payment, audit rights and 
similar terms and provisions that shall be consistent with similar arms-length 
transactions then being entered in respect of product licenses, in respect of 
the payment, reporting and auditing of such amounts and related provisions.

            In the event that the provisions of this Section 7.9 are 
applicable, the Company shall grant to Cytogen and Elan such audit and review
rights related to the calculation payments and challenging of such applicable
amounts as shall be reasonably customary in the pharmaceutical industry at such
time, which rights shall be set forth in a written instrument signed by the 
Company.
 
     7.10.  In no event shall Cytogen or Elan have any further or additional
liability or obligation to the Company, other than as set forth in this 
Agreement, by virtue of the payments provided for under Section 7.9.

* INFORMATION OMITTED AND FILED SEPARATELY WITH THE COMMISSION UNDER RULE 24b-2.

                                     -10-
<PAGE>
 
                                   ARTICLE 

                           PROPERTY OWNERSHIP RIGHTS

     8.1.   The Company shall own the legal and equitable title to the
Technology, the ATS Compounds and the Cytogen Compounds. Cytogen and Elan shall
have the sole right to license the Technology outside the Field Pursuant to and
in accordance with the provisions of this Article VIII and Section 11.2.

     8.2.   In the event that Cytogen or Elan wish to exploit the Technology 
outside the Field, such Shareholder or Shareholders shall provide written 
notice to such effect to the Company. The Company shall thereafter negotiate in 
good faith with each of the Shareholders as to the terms and conditions of a 
license or licenses in respect thereof, which shall be on then customary terms 
and conditions. Such license or licenses may be in the form of non-exclusive 
licenses to each of Cytogen and Elan or appropriate cross-licenses, or on such 
other terms and conditions as the Parties shall otherwise mutually agree; it 
being understood that such work which is directly related to or in furtherance
of development of the Compounds, Products or Technology shall be the property of
the Company. Such licenses may include non-exclusive license to each Cytogen and
Elan or appropriate cross-licenses among the Parties. If the Parties are unable
to agree upon the terms of any such license, such disagreement shall be referred
to an Independent Expert, as provided in Article XXII.

                                  ARTICLE IX

                                 PATENT RIGHTS

     9.1.   The Company shall have the right to obtain and prosecute patents and
patent rights relating to the Compounds, Products and Technologies, whether 
within or outside the Field; rights outside the Field shall be governed by 
Article VIII.

                                   ARTICLE X

                                  EQUIPMENT

     10.1.  Any equipment or other assets purchased by Cytogen and/or Elan 
which is funded by the Company shall belong to the Company. The Parties shall 
appropriate arrangements as regards marking of such equipment and assets, 
insurance and bailment provisions.

                                     -11-
<PAGE>
 
                                  ARTICLE XI

                           EXPLOITATION OF PRODUCTS

     11.1.  The Company will have an exclusive entitlement to develop and/or 
exploit Products in the Field. In order to commercialize the Products the 
Company shall obtain marketing approval in such countries in the Territory as is
determined by the Business Plan. It may be necessary to file an INDA and perform
clinical testing in more than one country, and the Shareholders shall reasonably
agree on such testing.

     11.2.  In the event that the Company decides that it does not wish to 
pursue the research and development and/or commercialization of a Product, 
and either Elan or Cytogen wishes to pursue such research and development and/or
commercialization, the Company shall grant a license agreement in respect of
such Product to Elan and/or Cytogen, as the case may be; provided, that such
Product does not or will not compete in any material respect with any Product or
proposed Product. The Company and the relevant Shareholder shall negotiate in
good faith the terms of such a license agreement, which shall be on then-
commercially customary and reasonable terms and conditions.

     11.3.  The strategy for the commercialization of the Products shall be 
determined by the Management Committee, subject to the supervision of the Board 
of Directors.

                                   ARTICLE XII

                       TECHNICAL SERVICES AND ASSISTANCE

     12.1.  Whenever commercially and technically feasible, the Company shall 
offer to contract with Cytogen or Elan as the case may be to perform such other 
services as the Company may require. In determining which party should provide 
such services, the Management Committee shall in good faith take into account 
the respective infrastructure and experience of Elan and Cytogen.

     12.2.  The Company shall if appropriate conclude an administrative support 
agreement with Elan and/or Cytogen on such terms as the parties thereto shall in
good faith negotiate. The management services required shall include one or more
of the following management services which shall be requested by the Company:

            (a) accounting, financial and other services;
            
            (b) tax services;

            (c) insurance services;

            (d) human resources services;

                                     -12-
<PAGE>
 
            (e) legal and company secretarial services;

            (f) patent and related intellectual property services; and

            (g) all such other services consistent with and of the same type as 
those services to be provided pursuant to this Agreement, as may be required

            The foregoing list of services shall not be deemed exhaustive and 
may be changed from time to time upon written request by the Company.

            If Elan or Cytogen so requires, in good faith, Cytogen or Elan shall
receive, at times and for periods mutually acceptable to the parties, employees
of the other party (such employees to be acceptable to the receiving party in
the matter of qualification and competence) for instruction in respect of the
Elan Technology or the Cytogen Technology as the case may be as is necessary to
further the Research and Development Programs.

            The employees received by Elan or Cytogen, as the case may be, shall
be subject to obligations of confidentiality no stringent than those set out 
herein and such employees shall observe the rules, regulations and systems 
adopted by the party receiving the said employees for its own employees or 
visitors.

                                 ARTICLE XIII

                      MANUFACTURE AND SUPPLY ARRANGEMENTS

     13.1.  If the Company elects to finance, develop and/or exploit the 
commercial production of a Product, the Company shall enter into a Supply 
Agreement with Cytogen or Elan or any Subsidiary of either to allow for the 
commercial production of such Product on behalf of the Company. The Supply 
Agreement shall be negotiated and agreed by the Parties as contemplated by the 
Business Plan or as otherwise agreed to by the Management Committee. The terms 
of the Supply Agreements shall be on normal commercial terms, and shall be 
negotiated in good faith by the Parties thereto. The determination of which of 
Cytogen or Elan shall be offered the first opportunity to enter into a Supply 
Agreement with the Company shall be made by the Company in good faith, based 
upon the relevant facts and circumstances, including the ability of Cytogen or 
Elan to manufacture the relevant Products and provide infrastructure and Product
support, and the experience and reputation of such Party's in commercializing 
the relevant Product.

                                  ARTICLE XIV

            AUDITORS; REGISTERED OFFICE; ACCOUNTING REFERENCE DATE

     14.1.  Unless otherwise agreed by the Shareholders and save as may be 
provided to the contrary herein;

                                     -13-
<PAGE>
 
          (a)  The auditors of the Company shall be Arthur Anderson, LLP or such
other auditors as may be chosen by Cytogen, which shall be reasonably
satisfactory to Elan. Elan shall retain the right to have an audit conducted for
their own internal purposes using another accounting.

          (b)  The registered office of the Company shall be at such address as 
the Shareholders shall agree from time to time; and

          (c)  The accounting reference date of the Company shall be 31 December
in each Financial Year.

                                  ARTICLE XV

                          SHARE RIGHTS AND DIRECTORS

     15.1.  All Shares shall be identical and shall rank pari passu, be of one
class and shall carry the same voting rights, rights to appoint and remove
Directors, rights to dividends and other rights as provided in the Articles, and
be subject to the restrictions on the transfer and distribution of assets and
other provisions set forth in the Clauses and as set forth in this Agreement.

                                  ARTICLE XVI

                     PROCEEDING OF DIRECTORS AND CHAIRMAN

     16.1.  The initial Chairman shall be a Director designated by Elan.

     16.2   The Chairman designated under Section 16.1 shall retire as Chairman 
at the first Annual Stockholders Meeting of the Company. Thereafter, each 
Shareholder, beginning with Cytogen, shall have the right, exercisable 
alternatively, of nominating one of the Directors to be Chairman of the Company 
for a period of one year. The Chairman shall hold office until the termination
of the next Annual Stockholders Meeting following his appointment. If the
Chairman is unable to attend any meeting of the Board, the Directors of the same
designation shall be entitled to appoint another Director to act as Chairman in
his place at the meeting. From and after the IPO, the Chairman shall be an
individual (who may be a Director designated by either Cytogen or Elan) who
shall be approved by the Directors, and who shall remain Chairman until his
retirement or replacement by the Directors.

     16.3.  In the case of an equality of votes at a meeting of the Board of the
Company, the Chairman shall not be entitled to a second or casting vote.

     16.4.  Any Shareholder removing a Director shall be responsible for and 
shall indemnify the other Shareholder and the Company against any claim by such 
Director in respect of dismissal arising from such removal.

                                     -14-
<PAGE>
 
     16.5.  The Directors shall meet not less than four times in any year and
all Directors' meeting shall be held at such location as shall be designated by
the Board. The quorum for each such meetings shall be a majority of Directors,
including at least one Cytogen Director and at least one Elan Director. In the
event that a quorum cannot be convened as a result of the persistent refusal of
a Shareholders' Directors to attend a meeting (which period shall not exceed 10
days), the provisions of Article XXIII shall be applicable.

                                 ARTICLE XVII

                   MATTERS REQUIRING SHAREHOLDERS' APPROVAL

     17.1.  Unless otherwise agreed between the Shareholders in writing, until 
the earlier of the occurrence of the IPO and either Cytogen or Elan owning, 
directly or indirectly, fewer than 20% of the Shares (in which case, the rights
described below shall lapse only with respect to such Shareholder and not the
other Shareholder) the Shareholders shall exercise all voting rights and other
powers of control available to them in relation to the Company to procure
(insofar as they are able by the exercise of such rights and such powers) that
neither the Company nor any Subsidiary of the Company shall without the prior
approval of the Shareholders (which may be evidenced by a vote of their
designated Directors).

            (a)  engage in any activity other than the Business;

            (b)  sell the principal assets, undertaking or business of the 
Company;
          
            (c)  appoint or dismiss a Director except in accordance with the 
rights conferred on the Shareholders under Article XVII to appoint and remove a
Director;

            (d)  create any fixed or floating charge, lien (other than a lien 
arising by operation of law) or other encumbrance over the whole or any part of 
the undertaking, property or assets of the Company or of any Subsidiary, except 
for the purpose of securing the indebtedness of the Company to its bankers for 
sums borrowed in the ordinary and proper course of the Business;

            (e)  borrow any sum (except from the Company's bankers in the 
ordinary and proper course of the Business) in excess of a maximum aggregate sum
outstanding at any time of $15,000;

            (f)  make any loan or advance or give any credit (other than normal
trade credit) in excess of $15,000 to any Person, except for the purpose of 
making deposits with bankers;

            (g)  give any guarantee or indemnity to secure the liabilities or 
obligations of any Party other than those which it is usual to give in the 
ordinary course of a business similar to the Business;

            (h)  sell, transfer, lease, assign, or otherwise dispose of part of 
the undertaking, property and/or assets other than stock or assets (or any 
interest therein) which are surplus to the

                                     -15-

<PAGE>
 
requirements of the Company or any Subsidiary, or contract so to do where the 
value of the undertaking property and/or assets exceed $15,000;

               (i)  enter into any contract, arrangement or commitment involving
expenditure on capital account or the realization of capital assets if the
amount or the aggregate amount of such expenditure or realization by the
Company, and all of the Subsidiaries of the Company would exceed $50,000 in any
one year or in relation to any one project, and for the purpose of this
paragraph the aggregate amount payable under any agreement for hire, hire 
purchase or purchase on credit sale or conditional sale terms shall be deemed to
be capital expenditure incurred in the year in which such agreement is entered
into;

               (j)  issue any unissued shares or create or issue any new shares;

               (k)  alter any rights attaching to any class of share in the 
capital of the Company or alter the Articles;

               (l)  consolidate, sub-divide or convert any of the Company's 
share capital or in any way alter the rights attaching thereto;

               (m)  create, acquire or dispose of any Subsidiary or of any 
shares in any Subsidiary;

               (n)  enter into any partnership or profit sharing agreement with 
any Person other than arrangements with trade representatives and similar 
Persons in the ordinary course of business;

               (o)  do or permit or suffer to be done any act or thing whereby 
the Company may be wound up (whether voluntarily or compulsorily), save as 
otherwise expressly provided for in this Agreement;

               (p)  issue any debentures or other securities convertible into 
shares or debentures or any share warrants or any options in respect of Shares;

               (q)  enter into any material contract or transaction except in 
the ordinary and proper course of the Business on arm's length terms;

               (r)  acquire, purchase or subscribe for any shares, debentures, 
mortgages or securities (or any interest therein) in any company, trust or 
other body;

               (s)  adopt any employee benefit program or incentive schemes;

               (t)  engage any new employee at remuneration which could exceed 
the rate of $60,000 per annum; or

               (u)  pay any remuneration to Directors designated by either of 
them as provided in Article VII by virtue of holding such office other than 
Directors who hold executive office.

                                     -16-






<PAGE>
 
                                 ARTICLE XVIII

                         THE BUSINESS PLAN AND REVIEWS


     18.1.  The Directors and Shareholders shall meet together as soon as
reasonably practicable after the date hereof and thereafter prior to the
accounting reference date specified in Article XIV in any Financial Year to
agree and approve the Business Plan for the following Financial Year, or any
amendment or modification to the Business Plan, with at least one Director
appointed by each Shareholder concurring.

     18.2.  The Shareholders agree that the Management Committee shall submit to
the Directors on 15th May, 15th August, 15th November, and 15th February or as
soon as reasonably practicable thereafter in each Financial Year a report on the
performance of the business activities of the Company and the Directors shall
hold such meeting as may be necessary to review the performance of the Company
against the Business Plan for the relevant year of trading.


                                  ARTICLE XIX

                              REVIEW AND DURATION

     19.1.  This Agreement shall remain in force for a period of two years from
the date hereof and thereafter, subject to the written agreement of the
Shareholders, shall be renewed for successive periods of one year.

     19.2.  The Shareholders shall meet together to review the performance of
the Company not less than six months prior to the expiration of the 
initial two-year period and six months prior to the expiration of each
successive one-year period referred to in Section 19.1. If following such
review, either Shareholder determines that it does not wish or intend to renew
or extend this Agreement as aforesaid, such Shareholder shall forthwith serve
written notice of discontinuance upon the other Shareholder whereupon the
provisions of Article XXI shall apply.

     19.3.  The following provisions shall be applicable in the event of a
termination of this Agreement or failure to renew this Agreement upon an
applicable renewal date (each, a "Termination Date"):

            (a) In the event that the Termination Date shall have occurred after
EIS shall have exercised the Exchange Right (as defined in the Securities
Purchase Agreement) and, accordingly, owns Shares, the provisions of Article XXI
shall be applicable and the provisions of Section 7.9(c) hereof shall survive
such termination.

            (b) In the event that the Termination Date shall have occurred after
EIS shall have elected to convert its Series A Preferred Stock of Cytogen and,
accordingly, the Exchange Right shall have lapsed neither party shall have any
additional rights hereunder, except that the provisions of Section 7.9(c) hereof
shall survive such termination.

                                     -17-
<PAGE>
 
            (c) In the event that the Termination Date shall have occurred prior
to the time that the Exchange Right shall have been exercised and prior to the
time, if any, that the Series A Preferred Stock of Cytogen shall have been
converted into Cytogen Common Stock, as a result of Cytogen's exercise of its
right to terminate under Section 19.2 (or election not to continue the business
of the Company), the ATS Products shall be transferred to or as directed by Elan
in the manner described in the Securities Purchase Agreement and neither party
shall have any additional rights hereunder, except the provisions of Section
7.9(c) hereof shall survive such termination, but the royalty rate shall be [*]
rather than [*], of Net Sales. In such event, the consideration to be paid by
Elan for the ATS Products shall be equal to the [INFORMATION OMITTED AND FILED
SEPARATELY WITH THE COMMISSION UNDER RULE 24b-2.]

            (d) In the event that the Termination Date shall occurred prior to
the time that the Exchange Right shall have been exercised and prior to the
time, if any, that the Series A Preferred Stock of Cytogen shall have been
converted into Cytogen Common Stock, as a result of any reason other than
described in clause (c) above, the ATS Products shall be transferred to or as
directed by Elan in the manner described in the Securities Purchase Agreement
and neither party shall have any additional rights hereunder, except that the
provisions of Section 7.9(c) hereof shall survive such termination but the
royalty rate shall be [*], rather than [*], of Net Sales. In such event, the
consideration to be paid by Elan for the ATS Products shall be equal to
[INFORMATION OMITTED AND FILED SEPARATELY WITH THE COMMISSION UNDER RULE 24b-2.]



                                  ARTICLE XX 

                       TRANSFER OF OR CHARGING OF SHARES

     20.1.  No Shareholder shall transfer any of its Shares or Loans to any
other Person (other than to any Affiliates, in whose hands the same restriction
on further transfer shall apply) without the prior written consent of the other.

     20.2.  No Shareholder shall transfer, create or dispose of any interests in
or over any of its Shares or Loans except:

            (a) by a transfer of the entire and legal beneficial interest in all
its Shares and Loans; and

            (b) to a transferee as permitted by this Agreement.

     20.3.  No Shareholder shall, except with the prior written consent of the
other Shareholder, create or permit to subsist any pledge, lien or charge over,
or grant any option or other rights or dispose of any interest in, all or any of
the Shares held by it (other than by a transfer of such Shares in accordance
with the provisions of this Agreement) or in any Loans (or

*-INFORMATION OMITTED AND FILED SEPARATELY WITH THE COMMISSION UNDER RULE 24b-2.


                                     -18-
<PAGE>
 
part thereof) made by it to the Company unless any Person in whose favor any 
such pledge, lien, or charge is created or permitted to subsist or such option 
or rights are granted or such interest is disposed of shall be expressly 
subject to and bound by all the limitations and provisions which are embodied in
this Agreement.

                                  ARTICLE XXI

                                  REALIZATION

     21.1.  For the purpose of Article XXI "Relevant Event" is committed or 
suffered by a Shareholder if:

            (a) an event specified in Section 19.3(a) shall have occurred; or

            (b) it commits a material breach of its obligations under this 
Agreement and, in the case of a breach capable of remedy, fails to remedy it 
within 30 days of being specifically required in writing to do so by the other 
Shareholder; or

            (c) a distress, execution, sequestration or other process is levied 
or enforced upon or sued out against a material part of its property which is 
not discharged or challenged within 20 days; or

            (d) it is unable to pay its debts in the normal course of business; 
or

            (e) it ceases or threatens to cease wholly or substantially to carry
on its business, otherwise than for the purpose of a reconstruction or 
amalgamation without the prior written consent of the other Shareholder (such 
consent not to be unreasonably withheld); or

            (f) the appointment of a liquidator, receiver, administrator, 
receiver, examiner, trustee or similar officer of such Shareholder or over all 
or a substantial part of its assets;

            (g) if an application or petition for bankruptcy, corporate 
reorganization, composition, administration, examination, arrangement or any 
other procedure similar to any of the foregoing under the law of any applicable 
jurisdiction is filed and is not discharged within 30 days, or if a shareholder 
applies for or consents to the appointment of a receiver, administrator, 
examiner or similar officer of it or of all or a material part of its assets, 
rights or revenues or the assets and/or the business of a Shareholder are for 
any reason seized, confiscated or condemned; or

            (h) a Person who is not a shareholder of a Shareholder or its 
Affiliates on the date of this Agreement acquiring control of that Shareholder.

     21.2.  If either Shareholder commits or suffers a Relevant Event, the other
Shareholder shall be entitled, within three months of its becoming aware of the 
occurrence of the Relevant Event, to require the defaulting Shareholder (the 
"Recipient Shareholder") to sell to the non defaulting Shareholder (the 
"Proposing Shareholder") all (but not less than all) of the Shares held

                                     -19-
<PAGE>
 
or beneficially owned by the Recipient Shareholder. The Proposing Shareholder 
shall notify the Recipient Shareholder of the exercise of this option by 
delivering written notice to the Recipient Shareholder stating that the option 
is exercised.

     21.3.  The Recipient Shareholder will be obliged within 60 days of receipt 
of such offer to either (a) accept such offer or (b) make a written counter 
offer in which the price per share must be at least 10% higher than in the offer
received from the Proposing Shareholder. The counter offer must be an offer to 
purchase all (but not less than all) of the Shares of the Proposing Shareholder.

     21.4.  The Proposing Shareholder will be obliged within seven days from the
date on which it receives the counter offer to either (a) accept the counter 
offer or (b) make a written second counter offer in which the price per share 
must be at least 10% higher than the counter offer received from the Recipient 
Shareholder. The second counter offer must be an offer to purchase all (but not
part only) of the shares of the Recipient Shareholder.

     21.5.  The Recipient Shareholder will be obliged within seven days from the
date on which it receives the second counter offer to either (a) accept the
second counter offer, or (b) to purchase all of the shares of the Proposing
Shareholder for an amount which is 10% higher than the price per share at which
the Proposing Shareholder offered to purchase the Shares of the Recipient
Shareholder in the second counter offer. The foregoing provisions relating to
bidding in 10% higher increments, as described in this Article XXI shall
continue until one of the Shareholders has elected to discontinue bidding.

     21.6.  Time shall be of the essence and a failure to respond to an offer or
any counter offer within the permitted time period shall be deemed to constitute
acceptance of such offer or counter offer.

     21.7.  The Shareholder who has accepted or is deemed to have accepted an 
offer or counter offer made pursuant to the provisions of this Section 22 shall 
deliver to the other Shareholder within 30 days of the date of acceptance or 
deemed acceptance (or three days following the issuance of any regulatory 
consent required to effect such sale) a duly executed transfer of all its shares
in favor of the other Shareholder (or as it may direct) upon full payment of the
relevant price for such shares. The Shareholders shall each use their best 
endeavors to procure the issuance of any such regulatory consents as soon as 
possible. The shares so transferred shall be deemed to be sold by the transferor
as beneficial owner with effect from the date of such transfer free from any 
lien, charge or encumbrance with all rights attaching thereto.

     21.8.  In the alternative to the procedure set out in Sections 21.2 to 
21.7, if either Shareholder commits or suffers a Relevant Event, the other 
Shareholder shall be entitled, within three months of its becoming aware of the 
occurrence of the Relevant Event, to serve a written notice ("Warning Notice") 
on the other Shareholder stating that it intends to serve a Winding-Up Notice 
(as hereinafter defined) on the Company. A Warning Notice may be withdrawn 
before the expiry of 60 days after it has been served ("the Warning Period"). 
Within 30 days of the expiry of the Warning Period during which period the 
relevant warning notice shall not have been withdrawn, the Party serving the 
Warning Notice may at any time serve a further written notice

                                     -20-
<PAGE>
 
("the Winding-Up Notice") on the other Shareholder requiring that the Company be
wound up, whereupon the Shareholders shall be bound to take all such steps as 
may be necessary to wind up the Company forthwith and in an orderly and 
efficient manner.

                                 ARTICLE XXII

                             EXPERT DETERMINATION

     22.1.  Should any dispute or difference arise between Elan and Cytogen or 
between Elan or Cytogen, and the Company, during the period that this Agreement 
is in force, then either Party shall forthwith give to the other notice of such 
dispute or difference, and such dispute or difference shall be and is hereby 
referred to such expert as the Parties in dispute may agree (the "Independent 
Expert"). In the event that the parties are unable or unwilling to agree upon 
an Independent Expert, or the Independent Expert declines to accept the 
appointment or after the appointment is incapable of acting or dies, the 
Parties, in the absence of agreement on a replacement within a period of seven 
days, shall forthwith request the American Arbitration Association in New York 
City to appoint a replacement to constitute the Independent Expert. The 
Independent Expert shall act as an expert and not as an arbitrator. The fees of 
the Independent Expert shall be shared equally between the Parties in dispute. 
The Independent Expert shall be entitled to inspect and examine all 
documentation and any other material which he may consider to be relevant to the
dispute. He shall afford each Party a reasonable opportunity (in writing or 
orally) of stating reasons in support of such contentions as each Party may wish
to make relative to the matters under consideration. The Independent Expert 
shall give notice in writing of his determination to the Parties within such 
time as may be stipulated in his terms of appointment or in the absence of such 
stipulation, within two weeks from the reference of the dispute or difference to
him. Any determination by the Independent Expert of a dispute of difference 
shall be final and binding on the Parties unless written notice of rejection of 
the determination is given by one Party to the other Party within 21 days from 
the date of the relevant determination. Any such rejection shall constitute a 
"Deadlock" for the purposes of Article XXI and the rejecting Party shall be 
deemed to be Proposing Shareholder.

                                 ARTICLE XXIII

                     PROCEDURE IN THE EVENT OF A DEADLOCK

     23.1.  For the purpose of this Article XXIII a "Deadlock" means any cause 
where the Shareholder notifies the other Shareholder in writing that they 
consider an irreconcilable deadlock has arisen at Director, Shareholder or 
Management Committee level with respect to any material item or matter relating 
to the Business or the Company, and identifying the matter in dispute. A 
Deadlock may only arise relating to a material item or matter; all immaterial 
items or matters shall not give rise thereto; a material item or matter means
one that could reasonably be expected to have a material or significant effect
on the Company's business, financial condition or prospects.

                                     -21-
 



<PAGE>
 
     23.2.  In any case of Deadlock each of the Shareholders shall within 10 
days of the Deadlock arising, cause its appointees on the Board or the
Management Committee, as the case may be, to prepare and circulate to the other
Shareholder and the other Directors a memorandum or other form of statement
setting out its position on the matter in dispute and its reasons for adopting
that position. Each memorandum or statement shall be considered by the chief
executive officer of each Shareholder to which it is addressed who shall
endeavor to resolve the Deadlock. Each Shareholder agrees upon a resolution or
disposition of the matter, they shall execute a statement setting out the agreed
terms. The Shareholders shall exercise the voting rights and other powers
available to them in relation to the Company to procure that the agreed terms
are fully and promptly carried into effect.

     23.3.  If the Deadlock is not resolved or disposed of in accordance with 
Section 23.2. within 30 days after expiry of the seven-day period, or such 
longer period as the Shareholders agree in writing, and if it prevents the 
Company or a Subsidiary from continuing to achieve its business purposes, either
Shareholder may (if they have not previously done so) refer the matter to an 
expert pursuant to the provisions of Article XXII, and the provisions of Article
XXI shall otherwise be applicable.

                                 ARTICLE XXIV

                                  WINDING UP

     24.1.  In the event of the Company being wound up by way of the 
Shareholder's voluntary winding up, the Shareholders will procure that the 
liquidator is a member of the American Institute of Certified Public Accounts 
("AICPA") or member of the Bar of any state acceptable to both Shareholders, or 
in default of agreement, nominated by the President of the AICPA.

     24.2.  The Shareholders shall prove in the winding up of the Company to 
the maximum extent permitted by applicable law for all sums due or to fall due
to them respectively from the Company and shall exercise all rights of set-off
and generally do all such other acts and things as may be available to them in
order to obtain the maximum receipts and recoveries.

                                  ARTICLE XXV

                                CONFIDENTIALITY

     25.1.  The Shareholders and the Company acknowledge that it may be
necessary, from time to time, to disclose to each other confidential and
proprietary information, including without limitation, inventions, works of
authorship, trade secrets, specifications, designs, data, know-how and other
information, relating to the Field, the Products, processes, and services of the
disclosing Party.

                                     -22-



    
<PAGE>
 
     25.2.  The Shareholders and the Company agree that the information to be 
disclosed by Cytogen and Elan to the Company may include trade secrets, know-how
and other proprietary information and data regarding the Technology. It is 
agreed that the information to be disclosed by the Company to Cytogen and Elan 
may include trade secrets, know-how and other proprietary information and data 
regarding the Compounds or the Products.

     25.3.  The foregoing shall be referred to collectively as "Confidential 
Information". Any Confidential Information revealed by a Party to another Party 
shall be used by the receiving Party exclusively for the purposes of fulfilling 
the receiving Party's obligations under this Agreement, and for no other 
purpose.

     25.4.  Each Party agrees to disclose Confidential Information of another 
Party only to those employees, representatives and agents requiring knowledge 
thereof in connection with their duties directly related to the fulfilling of 
the Party's obligations under this Agreement. Each Party further agrees to 
inform all such employees, representatives and agents of the terms and 
provisions of this Agreement and their duties hereunder and to obtain their 
consent hereto as a condition of receiving Confidential Information. Each Party 
agrees that it will exercise the same degree of care and protection to preserve 
the proprietary and confidential nature of the Confidential Information 
disclosed by a Party, as the receiving Party would exercise to preserve its own 
proprietary and confidential information. Each Party agrees that it will, upon 
request of a Party, return all documents and any copies thereof containing 
Confidential Information belonging to or disclosed by, such Party.

     25.5.  Any breach of this Article XXV by any of the Persons informed by one
of the Shareholders is considered a breach by the Party itself.

          Confidential Information shall not be deemed to include:

            (a) Information that is in the public domain.

            (b) Information which is made public by the disclosing Party.

            (c) Information which is independently developed by a Party.

            (d) Information that is published or otherwise becomes part of the 
public domain without any disclosure by a Party, or on the part of a Party's 
directors, officers, agents, representatives or employees.

            (e) Information that becomes available to a Party on a 
non-confidential basis, whether directly or indirectly, from a source other than
a Party, which source, to the best of the Party's knowledge, did not acquire
this information on a confidential basis; and

            (f) Information which the receiving Party is required to disclose 
pursuant to a valid order of a court or other governmental body or any political
subdivision thereof or otherwise required by law.

                                     -23-
<PAGE>
 
     25.6.  The provisions relating to confidentiality in this Article XXV shall
remain in effect during the term of this Agreement, and for a period of seven 
years following the expiration or earlier termination of this Agreement.

     25.7.  The Shareholders agree that the obligations of this Article XXV are 
necessary and reasonable in order to protect the Shareholders' respective 
businesses, and each Party expressly agrees that monetary damages would be 
inadequate to compensate a Party for any breach by the other Party of its 
covenants and agreements set forth herein. Accordingly, the Shareholders agree 
and acknowledge that any such violation or threatened violation will cause 
irreparable injury to a Party and that, in addition to any other remedies that 
may be available, in law and equity or otherwise, any Party shall be entitled to
obtain injunctive relief against the threatened breach of the provisions of this
Article XXV, or a continuation of any such breach by the other Party, specific 
performance and other equitable relief to redress such breach together with its 
damages and reasonable counsel fees and expenses to enforce its rights 
hereunder, without the necessity of proving actual or express damages.


                                 ARTICLE XXVI

                             SHAREHOLDERS' CONSENT

     26.1.  Where this Agreement provides that any particular transaction or 
matter requires the consent, approval or agreement of any Shareholder, such 
consent, approval or agreement may be given subject to such terms and conditions
as that Shareholder may impose and any breach of such terms and conditions by 
any Persons subject thereto shall ipso facto be deemed to be a breach of the 
terms of this Agreement.


                                 ARTICLE XXVII

                                     COSTS

     27.1.  The Company shall bear the legal and other costs of the Parties 
incurred in relation to preparing and concluding this Agreement and the related 
agreements and other documents.

     27.2.  All costs, legal fees, registration fees and other expenses, 
including the costs and expenses incurred in relation to the incorporation of 
the Company, shall be borne by the Company.

                                     -24-
<PAGE>
 
                                ARTICLE XXVIII

                                    GENERAL

     28.1.  Each of the Parties hereto undertakes with the others to do all 
things reasonably within its power which are necessary or desirable to give 
effect to the spirit and intent of this Agreement and the Clauses.

     28.2.  The Parties hereto shall use their respective reasonable endeavors 
to procure that any necessary third Party shall do, execute and perform all such
further deeds, documents, assurances, acts and things as any of the Parties 
hereto may reasonably require by notice in writing to the others to carry the 
provisions of this Agreement into full force and effect.

     28.3.  Where either Shareholder is required under this Agreement to 
exercise its powers in relation to the Company to procure a particular matter or
thing such obligation shall be deemed to include an obligation to exercise its 
powers both as a Shareholder and as a Director (where applicable) of the Company
and to procure that any Director appointed by it (whether alone or jointly with 
any other Person) shall procure such matter or thing.

     28.4.  Neither Party to this Agreement shall be liable for delay in the 
performance of any of its obligations hereunder if such delay results from 
causes beyond its reasonable control, including, without limitation, acts of 
God, fires, strikes, acts of war, or intervention of any relevant government 
authority, but any such delay or failure shall be remedied by such Party as soon
as practicable.

     28.5.  Nothing contained in this Agreement is intended or is to be 
construed to constitute Elan and Cytogen as partners, or Elan as an employee of 
Cytogen, or Cytogen as an employee of Elan. No Party hereto shall have any 
express or implied right or authority to assume or create any obligations on 
behalf of or in the name of the Party or to bind the other Party to any 
contract, agreement or undertaking with any third Party.

     28.6.  This Agreement may be executed in any number of counterparts, each 
of which when so executed shall be deemed to be an original and all of which 
when taken together shall constitute this Agreement.

     28.7.  Any notice to be given under this Agreement shall be sent in writing
by registered or recorded delivery post or telecopied to:

                                     -25-
<PAGE>
 
                         Elan at:

                         Elan Corporation, plc
                         Monksland, Athlone
                         County Westmeath
                         Ireland
                         Attention: Chief Financial Officer
                         Telefax: 353-902-92427

                         copy to:

                         O'Sullivan Graev & Karabell, LLP
                         30 Rockefeller Plaza
                         New York, NY 10112
                         Attention: David Robbins, Esq.
                         Telefax: (212) 408-2420

                         Cytogen at:

                         Cytogen Corporation
                         600 College Road East
                         Princeton, New Jersey 08540-5308
                         Attention: Chief Financial Officer
                         Telefax: (609) 951-9298     

                         copy to:
                         
                         Dewey Ballantine
                         1301 Avenue of the Americas
                         New York, NY 10019
                         Attention: Frederick W. Kanner, Esq.
                         Telefax: (212) 259-6333

                         the Company at:
                    
                         Targon Corporation
                         600 College Road East
                         Princeton, New Jersey 08540
                         Attention: Chief Executive Officer
                         Telefax: (609) 951-9298

                                     -26-

<PAGE>
 
                         copy to:                             
                                                              
                         O'Sullivan Graev & Karabell, LLP     
                         30 Rockefeller Plaza                  
                         New York, NY 10112                   
                         Attention: David Robins, Esq.        
                         Telefax: (212) 408-2420              
                                                              
                         copy to:                             
                                                              
                         Dewey Ballantine                     
                         1301 Avenue of the Americas          
                         New York, NY 10019                   
                         Attention: Frederick W. Kanner, Esq. 
                         Telefax: (212) 259-6333                

or to such other address(es) as may from time to time be notified by either 
Party to the other hereunder.

          Any notice sent by mail shall be deemed to have been delivered within 
seven working days after dispatch and any notice sent by telecopy shall be 
deemed delivered within 24 hours of the time of the dispatch. Notices of change 
of address shall be effective upon receipt.

     28.8.  This Agreement shall be governed by and construed in accordance with
the laws of Delaware and the Parties agree to submit to the jurisdiction of any 
federal or state court sitting in New York City for the resolution of disputes 
hereunder.

     28.9.  If any provision in this Agreement is agreed by the Parties to be,
deemed to be or becomes invalid, illegal, void or unenforceable under any law
that is applicable hereto, (i) such provision will be deemed amended to conform
to applicable laws so as to be valid and enforceable or, if it cannot be so
amended without materially altering the intention of the Parties, it will be
deleted, with effect from the date of such agreement or such earlier date as the
Parties may agree, and (ii) the validity, legality and enforceability of the
remaining provisions of this Agreement shall not be impaired or affected in any
way.

     28.10. No amendment, modification or addition hereto shall be effective or
binding on either Party unless set forth in writing and executed by a duly 
authorized representative of both Parties.

     28.11. No waiver of any right under this Agreement shall be deemed 
effective unless contained in a written document signed by the Party charged 
with such waiver, and no waiver of any breach or failure to perform shall be 
deemed to be a waiver of any future breach or failure to perform or of any other
right arising under this Agreement.

                                     -27-
<PAGE>
 
     28.12. The section headings contained in this Agreement are included for 
convenience only and form no part of the agreement between the Parties. Except 
as otherwise provided herein, references to articles, paragraphs, clauses and 
appendices are to those contained in this Agreement.

     28.13. None of the Parties may assign their rights and obligations 
hereunder without the prior written consent of the other Parties. Elan and/or 
Cytogen shall have the right to delegate or subcontract all or any portion of 
their duties hereunder to their respective Affiliates; provided, that Elan or 
Cytogen, as the case may be, guarantees the performance by such Affiliate of the
obligations of Elan or Cytogen, as the case may be under this Agreement.

     28.14. No provision of this Agreement shall be construed so as to negate, 
modify or affect in any way the provisions of any other agreement between the
Parties unless specifically referred to, and solely to the extent provided, in
any such other agreement.

     28.15. This Agreement shall be binding upon and enure to the benefit of the
Parties hereto, their successors and permitted assigns.

                                     -28-
<PAGE>
 
          IN WITNESS WHEREOF, the Parties hereto have executed this Agreement on
the day first set forth above.


                                  ELAN CORPORATION, PLC              
                                                                     
                                                                     
                                  By: /s/   Donal Geaney
                                     ---------------------------------
                                     Name:  Donal Geaney
                                     Title: CEO                          
                                                                     
                                                                     
                                                                     
                                  CYTOGEN CORPORATION                
                                                                     
                                                                     
                                  By: /s/   Thomas J. McKearn
                                     ---------------------------------
                                     Name:  Thomas J. McKearn
                                     Title: Chairman, President and CEO
                                                                     
                                                                     
                                  TARGON CORPORATION                 
                                                                     
                                                                     
                                  By: /s/   Michael Sember
                                      ---------------------------------
                                     Name:  Michael Sember
                                     Title: CEO and Chairman

<PAGE>
 
                               LIST OF EXHIBITS

EXHIBIT A            Business Plan of Targon Corporation

EXHIBIT B            List of ATS Compounds

EXHIBIT C            List of Cytogen Compounds

EXHIBIT D            Certificate of Incorporation and Bylaws of Targon
                     Corporation
<PAGE>
 
                                   Exhibit A
                                   ---------
<PAGE>
 
                                 CONFIDENTIAL
                                 ------------




                                     NEWCO



                          A Drug Development Company
              Focused on the Identification and Commercialization
                      of Differentiated Oncology Products









                              Business Plan Draft
                                  August 1996






        This Document Contains Confidential and Proprietary Information
<PAGE>
 
I.   Executive Summary

Newco is planned as a "virtual" product development company focused on the
identification, development, registration and manufacturing of differentiated
oncology products. The Company will be formed as a joint venture between Elan, a
leading worldwide drug delivery and biopharmaceutical company and Cytogen, an
emerging biopharmaceutical company with recognized expertise in the development
and registration of oncology products. The Company will utilize existing parent
company competencies to achieve highly focused, expedited development and
manufacturing programs for the global registration of late stage oncology
products. Products will be accessed via the two parent companies' existing
pipeline, as well as through the identification and in-licensing of
differentiated oncology products that can benefit from either parents'
competencies. In-licensed products will be sourced from biotechnology companies-
where Newco will be positioned as an alternative commercialization partner to
large PMA companies, from larger drug companies with oncology products outside
of their strategic focus or interests and from academic settings in need of drug
development and registration services.

According to the American Cancer Society, the estimated number of cancer cases
diagnosed annually in the United States (excluding certain skin cancers)
increased from approximately 782,000 in 1980 to approximately 1.2 million in
1994, an increase of 53%. This increase is attributable to a number of factors,
including a growing and aging population. As a result, over eight million
Americans alive today have been diagnosed with cancer. The Company anticipates
that these trends will continue and that the number of cancer patients, and the
demand for oncology services, will continue to increase.

The oncology market is actually comprised of more than 100 complex diseases
characterized by the uncontrolled growth and spread of abnormal cells. The
delivery of oncology services consists of a wide range of therapies delivered by
a variety of physician types, and provided at institutional, outpatient and
homecare sites. Pharmaceuticals used in the treatment of cancer are numerous,
each drug having its own, usually very narrowly defined, therapeutic purpose.
These products can be categorized into chemotherapy, immunotherapy, hormonal
therapy and newer applications, and are supplemented by non-pharmaceutical
approaches of radiation therapy and surgery. Despite major advances in the
understanding of the molecular and cellular mechanisms involved in cancer, cures
for the majority of cancers have not yet been obtained. As a result, there are
important unmet medical needs in the management of cancer patients and a
significant commercial market for new anticancer agents and cancer treatment
strategies that respond to these unmet needs.

The oncology pharmaceutical market is predicted to grow to an estimated 
$1 billion by the year 2002 and represents one of the fastest growing segments
in the pharmaceutical industry. The Company believes that a significant
commercial opportunity exists in cancer through the development of products for
enhanced patient classification, therapy selection and safety/efficacy. Improved
differential diagnoses through patient classification would enable more
appropriate therapy selection by physicians. Products with wider safety and
efficacy profiles promise greater

                                       1
<PAGE>
 
utility, both among novel compounds and the modification of existing compounds.

The Company also believes that the use of technologies that enhance the
performance or efficacy of anticancer drugs will grow significantly over the
next several years. Drug delivery systems, chemoprotectors and other adjuvants
will contribute to the growth of both traditional chemotherapeutic and new
immunotherapeutic segments.

The ability to bring to market enhanced diagnostics and therapeutics in oncology
requires several assets or competencies:

   .  Basic research - characterized by a thorough understanding of the complex
      biological, molecular and cellular processes involved in cancer, extensive
      networks and collaborations with other cancer research institutes and an
      appreciation for the limitations of existing agents and treatment
      strategies.

   .  Clinical development - that includes a thorough knowledge of the
      regulatory trends and requirements for cancer products and a proven track
      record in designing clinical protocols and trials capable of obtaining
      definitive outcomes in the shortest possible time frames.

   .  Manufacturing - expertise in both biologics and non-biologics and a
      system capable of benefiting from advances in computerization and
      automation.

The marketplace in which the Company will compete is comprised of numerous
biotechnology research companies, selected larger pharmaceutical suppliers and
specialized support services (e.g. CRO's). Significantly, a large pipeline of
products with cancer indications exists both among the plethora of small
biotechnology research companies as well as among the minor products outside the
focus of larger pharmaceutical suppliers. Currently, the CRO industry accounts
for approximately $3 billion of biotechnology and pharmaceutical expenditures
and is expected to grow 15% on an annual basis.

The Company believes that significant gaps in the aforementioned required
assets/competencies in drug development exist among the large group of
biotechnology companies, primarily in development, manufacturing and
marketing/sales. Previously, these companies have turned to large pharmaceutical
suppliers to access required competencies, in return for which they relinquished
a significant portion of the future product revenue stream. The partnership
between Elan and Cytogen, provides an alternative vehicle for filling
development and manufacturing gaps. Biotechnology companies would be able to
gain access to markets rapidly with potentially enhanced product performance
profiles via a focused development process and utilization of novel drug
delivery systems. In addition, applicable products in oncology among larger
pharmaceutical suppliers may benefit from utilizing Newco's
reformulation/commercialization expertise - and present a more favorable
economic argument than within the pharmaceutical parent.

All of the requisite core competencies for bringing a product to market exist
among the parent

                                       2
<PAGE>
 
companies, and the partnership thus brings to bear quickly a relatively unique
combination of assets:

Elan
- ----

 .      Development:  Recognized drug delivery expertise in enhancing the 
       -----------
       performance profile of new and existing products.

 .      Pipeline: Mid-term pipeline potential from EL530 and EL532, two early
       --------
       stage non-toxic differentiation agents for the treatment of multiple
       tumor types licensed from the National Cancer Institute.

 .      Financial: Solid financial condition with a proven track record in
       ---------
       establishing value-added joint ventures, strategic alliances and
       marketing partnerships.

 .      Organizational: Strategically organized to grow through both existing
       --------------
       competencies and products and external agreements and relationships.

 .      Manufacturing:  Highly efficient product manufacturing capabilities 
       -------------
       exceeding all worldwide regulatory requirements.

Cytogen
- -------

 .      Development: Proven track record and recognized clinical/regulatory
       -----------
       expertise in oncology -- one of 20 out of 1300 biotechnology companies to
       achieve FDA approval.

 .      Pipeline: Near to mid-term pipeline in diagnostic products, including
       --------
       ProstaScint-Technetium for prostate cancer staging and OncoScint-Breast
       for breast cancer staging.

 .      Manufacturing: One of seven biotechnology companies to receive an
       -------------
       Establishment License Application (ELA) for the manufacture of well-
       characterized biologics.

Newco will be formed as a "virtual" company, accessing each company's
assets/competencies to create a unique combination of core competencies designed
to provide the most efficient and effective development channel for
differentiated oncology products. In doing so, Newco will be well positioned to
reduce many of the risks inherent in the development of new products. Efficiency
in development will be derived from shared resources of Newco's parents, which
will deliver economies in product development and manufacturing processes.
Effectiveness will be derived from the design of more reliable clinical trial
results, more timely regulatory approval and application of novel drug delivery
technology to the compounds. The company believes that the provision of enhanced
efficiency and effectiveness will deliver a significant competitive advantage
for Newco over other development alternatives.

Beyond the existing product pipeline of the parent companies, access to external
compounds will


                                       3
<PAGE>
 
be the key source of value for Newco. As such, the contributed pipeline products
from Elan and Cytogen will truly serve as an early source of revenues for Newco,
but importantly will be commercialized rapidly as tangible validations of the
concept for in-licensing discussions.

Products selected for in-licensing will be required to meet rigid selection
criteria to ensure that they can benefit from the drug delivery and regulatory
expertise of Newco, and achieve a differentiated market position. Examples of
potential products include (1) pain management products, (2) anti-emetics and
(3) chemotherapeutic agents.

Finally, the returns to parent companies are tangible and realizable, and can be
categorized into near and long term.

           Near term, Elan and Cytogen will benefit from access to increased
           funding for research and development, while both companies will
           achieve revenues for providing services to Newco.

           Mid-term, Elan and Cytogen will benefit from returns achieved from
           the out-licensing and royalty stream from the commercialization of
           its late stage products.

           Longer term returns to both parents will be both economic and
           strategic including royalty and licensing fees, efficient access to
           external capital and access to other oncology products.



                                       4
<PAGE>
 
II.  Mission Statement and Business Overview

The mission of Newco is to be a leader in the development, registration and
manufacturing of differentiated pharmaceutical products for cancer patients,
with emphasis on improving the targeted delivery of useful therapeutic agents.

Newco is planned as a "virtual" product development company focused on the
identification, development, registration and manufacturing of differentiated
oncology products. The Company will be formed as a joint venture between Elan, a
leading world-wide drug delivery and biopharmaceutical company and Cytogen, a
leader in the development and registration of oncology products. The Company
will utilize existing parent company competencies to achieve highly focused,
expedited development and manufacturing programs for the global registration of
late stage oncology products. Products will be accessed via parent companies'
existing pipeline, as well as through the identification and selection of
differentiated oncology products that can benefit from either parents
competencies, from other sources. These external sources will include
biotechnology companies - where Newco will be positioned as an alternative
commercialization partner to large PMA companies, to larger drug companies with
oncology products outside of their strategic focus or interests and to academic
settings in need of drug development and registration services.

III. Oncology Market Overview

a)   Market Definition

Cancer is actually comprised of more than 100 complex diseases characterized by
the uncontrolled growth and spread of abnormal cells. The delivery of oncology
services is comprised of a range of therapies delivered by a variety of
physician types, and provided at institutional, outpatient and homecare sites.
Currently, due to cancer's complexity, a wide variety of therapies are utilized
in an attempt to achieve first, a cure and second, extend life.

The oncology pharmaceutical market is predicted to grow to an estimated 
$1 billion by the year 2002 and represents one of the fastest growing segments
in the pharmaceutical industry. While the incidence in major malignancies is
expected to grow approximately 45% in the next decade, mortality is predicted to
increase only nine percent due to the growing efficacy of cancer therapeutic
treatments, including surgical and radiation procedures and newer anticancer
agents. These treatments are not always curative with the outcome and the
patient remains palliative in nature. As a result, there are important unmet
patient needs in the cancer market and the Company believes that a significant
commercial opportunity in cancer through the development of products for
enhanced patient classification, therapy selection and safety/efficacy. Improved
differential diagnosis through patient classification would enable more
appropriate therapy selection by physicians. Products with wider safety and
efficacy profiles promise greater utility, both among novel compounds and the
modification of existing compounds.

The Company also believes that the use of technologies that enhance the
performance or efficacy 

                                       5
<PAGE>
 
of anticancer drugs will grow significantly over the next several years. Drug
delivery systems, chemoprotectors and protectors, other adjuvants and cellular
differentiation agents will contribute to the growth of both traditional
chemotherapeutic and new immunotherapeutic segments.

Pharmaceuticals used in the treatment of cancer are numerous, each drug having
its own, usually very narrowly defined, therapeutic purpose. These products can
be categorized into chemotherapy, immunotherapy, hormonal therapy and newer
applications, and are supplemented by non-pharmaceutical approaches of radiation
therapy and surgery.

 .      Chemotherapy, the treatment of disease by means of chemical substance
       (pharmaceuticals), is commonly used to destroy cancer cells that have
       spread to other parts of the body. It is often complicated, requiring
       management of not only the chemotherapy itself, but also of its potential
       adverse side effects. Chemotherapy is typically provided under the care
       of an oncologist or hematologist. Products in this category include
       alkylating agents, antimetabolites, natural products and miscellaneous
       agents such as platinum DNA interkylating coordinating agents. These
       products are cytotoxic drugs with moderate selectivity for tumor cells,
       and are capable of inducing measurable responses and prolonging survival
       in many patients with common adult solid malignancies. However, they are
       not curative in most circumstances, and they are associated with
       significant patient side effects. Recent advances in this field have
       focused on such areas as resistance to chemotherapeutic agents and the
       increased use of adjuvant and "neo-adjuvant" chemotherapy (the
       administration of chemotherapeutic agents prior to surgery or radiation
       in an effort to shrink the tumor prior to definitive local treatment).

 .      Immunotherapy, treatment directed at enhancing the patient's immune
       system, involves advanced therapies such as interferon (a naturally
       occurring human protein capable of stopping cancers growth) and other
       biologic response modifiers. As with chemotherapy, treatment is usually
       provided by an oncologist or hematologist. Information accumulating in
       the fields of immunology and molecular and cellular biology has resulted
       in the generation of new molecular entities with potential as anticancer
       agents. New cytokines have been discovered and entered into early phase
       clinical trials. Meanwhile, interleukin-2 (IL-2) and interferon continue
       to find new applications as antitumor agents, often in combination with
       more traditional therapies. Several monoclonal antibodies are being
       developed as therapeutics for hemalogic malignancies, and others (such as
       antioncogene MAbs) are being studied in combination with standard
       chemotherapy. Potential gene therapy applications in oncology are
       numerous, and studies utilizing this approach have been initiated at most
       major university research centers in the U.S. The use of autolymphocyte
       therapy (ALT), a proprietary immunotherapy using a patient's own cells to
       treat cancer, is also under development and has shown positive results in
       the treatment of patients with metastatic kidney cancer. Vaccine therapy
       which would enable the body to recognize tumors as "non-self" and thus
       destroy them represent a potentially promising approach for new curative
       agents as well as reoccurrence-preventing treatments.

 .      Hormonal therapy, treatment using hormones such as estrogen, is very 
       popular due to its


                                       6
<PAGE>
 
       ease of administration, lack of toxicity, and occasional positive
       metabolic effects (such as weight gain) associated with it.

 .      Radiation therapy is commonly used to destroy localized tumors and reduce
       pain and other symptoms.

 .      Surgery can be used in both diagnosis and treatment.

Increasingly, treating cancer involves a combination of these, and other, more
recently developed, treatment methods. Improved clinical outcomes and treatment
costs are driven by enhancing diagnosis (through either earlier detection or
more effective disease staging), improving safety/efficacy and optimizing the
selection of therapy.

b)     Market Scope

As previously described, the provision of cancer treatment is a significant and
growing market. According to the American Cancer Society, the estimated number
of cancer cases diagnosed annually in the United States (excluding certain skin
cancers) increased from approximately 782,000 in 1980 to approximately 
1.2 million in 1994 (an increase of 53%), due largely to a growing and aging
population. As a result of these forces, over eight million Americans alive
today have been diagnosed with cancer. Lung cancer has driven this growth,
increasing 450% among women and 100% among men since the 1950's. The Company
anticipates that these trends will continue and that the number of cancer
patients, and the demand for oncology services, will continue to increase. It is
estimated that the market for oncology pharmaceuticals will reach $1 billion by
the year 2002.

The most common type of cancer is prostate cancer, with approximately 200,000
new cases diagnosed in 1994. In the past two years prostate overtook breast
cancer, which was second in 1994 with 182,000 new cases; lung was third with
172,000, and colorectal was fourth with 142,000.

Cancer is second only to heart disease as the leading cause of death in the
United States, and close to one quarter of all deaths in the U.S. are due to
cancer. Deaths have increased significantly, led by lung cancer which accounted
for 153,000 deaths in 1994. Melanoma and myeloma have also increased
significantly, although not nearly to this extent. Cancers for which mortality
has decreased the most are cervical, uterine, stomach and Hodgkin's.

The cost of treating cancer patients has also increased - currently, the cost of
cancer exceeds that of any other disease group in the U.S., surpassing even
cardiovascular disease. This escalation is expected to continue. The National
Cancer Institute estimates that total cancer costs (including lost productivity
and mortality costs) were approximately $104 billion in 1994, with direct
medical costs constituting approximately $35 billion of that total. Direct costs
have increased 61% since 1985, and nearly 170% from 1975. The Company believes
that these direct medical costs associated with cancer will increase more
rapidly than those associated with most other

                                       7
<PAGE>
 
diseases due to the growth in number of cancer patients and the high cost of new
therapies. As a result, the market for oncology pharmaceuticals is estimated to
be $1 billion by the year 2002.

c)   Competitive Environment

The oncology marketplace is characterized by a high degree of competition
generated by numerous biotechnology research companies, as well as by selected
larger pharmaceutical suppliers. Significantly, a large pipeline of products
with cancer indications exists among both the plethora of biotechs, and the
larger PMA companies, whose products in this therapeutic area at times tend to
be distinct from the companies' primary focus, or are smaller than is warranted
for commercialization. Schering, Bristol Myers Squibb, Roche, Pharmacia,
Burroughs Wellcome, Abbott and Zeneca are among the notable PMA's involved in
oncology. Leading biotechs include Amgen, Genentech, Chrion, Biogen and Immunex.

The biotechnology industry is in an early growth phase relative to many other
industries. Since 1981, the FDA has approved ?? biopharmaceutical products, ??
of which are therapeutics, (?? vaccine). Today, more than 160 biotech products
(a significant number of which are believed to be in oncology) are undergoing
human clinical trials, many of which have reached Phase II and III trials. In
terms of the total anticancer drug market, over 1,000 chemotherapy,
immunotherapy, adjuvant and other products are currently in development,
approximately one-third of which are in Phase I or beyond. The next few years
are likely to bring significant changes to this industry as longer development
times and lack of capital force consolidation among small biotechs. It is
anticipated that this environment may be very receptive to alternative
development and commercialization vehicles.

Among the large PMA companies, competitive (and regulatory) forces have
generated considerable pricing pressures. As a result, these companies look to
large, differentiated products to provide needed revenues. The oncology
therapeutic area is not characterized by these "high profile" drugs; is
therefore not an area in which PMA's are willing to develop the unique
commercialization expertise required. The Company believes that this environment
will also be very interested in the Newco concept.

The competition has intensified largely due to third party payors, particularly
managed care organizations (MCOs), which exert pressure on both suppliers and
providers to control the costs of healthcare products and services. These forces
have dramatically influenced the way pharmaceuticals are purchased, and they
have forced suppliers and biotech companies to limit their development programs
to differentiated products that deliver demonstrated economic and clinical
effectiveness. This effectiveness may be demonstrated either by reduced
"component" costs (e.g. lower cost per script, physician visit, or inpatient
admission), or by lower "system" costs (i.e. lower overall costs of treating a
disease). The ability to quickly triage among alternative pipeline products
based on their ability to deliver clinical and economic value, and to
efficiently and effectively commercialize these products, will therefore become
increasingly important.

                                       8
<PAGE>
 
Given these market pressures, and the high cost of developing and
commercializing a "me too" product, it has become more difficult to justify
investing in a "me too" product that will compete on price alone. Unfortunately,
the number of new, available differentiated drugs in later stages of development
is limited. As a result, Newco will be competing with both pharmaceutical
suppliers and biotechs in the search to access these products. The basis of this
competition will be players' abilities to provide (1) an efficient process, (2)
an effective process and (3) demonstrable results.

In addition, it is anticipated that future technological developments will
enhance the ability to identify and triage new/improved oncology products, such
as those developed using Cytogen's peptide screening technology.

d)   Opportunities

As discussed in the Market Scope (above), it is anticipated that there will be
large growth in the number of cancer patients and, therefore, the demand for
oncology services. Additionally, given the continued absence of a cure for
cancer, the Company believes that a significant opportunity exists to improve
the effectiveness with which cancer is diagnosed and treatment options are
selected.

Today, the selection among the broad armamentarium of oncology products
available is extremely subjective, often leading to sub-optimal patient
treatment and outcomes. This problem is compounded by the fact that many
products have narrow dosing regimens and safety/efficacy profiles, further
limiting their clinical utility.

           Improved differential diagnosis through patient classification would
           enable more appropriate therapy selection by physicians.

           Products with wider safety and efficacy profiles would promise
           greater utility both among novel compounds and the modification of
           existing compounds.

           The ability to provide enhanced patient classification, therapy
           selection and safety/efficacy, therefore, would be of tremendous
           value, both clinically (better outcomes) and economically (lower
           cost/greater value per outcome).

The Company believes that the use of technologies that enhance the performance
or efficacy of anticancer drugs will grow significantly over the next several
years. Drug delivery systems, chemoprotectors and sensitizers, other adjuvants
and cell differentiation agents will contribute to the growth of both
traditional chemotherapeutic and new immunotherapeutic segments.

The Company also believes that creating a virtual company to access and develop
differentiated products that can benefit from the competencies of both parents
represents a commercially-viable opportunity. As is discussed in more detail in
Requirements for

                                       9
<PAGE>
 
Success (below), biotech research companies often lack needed development
competencies, and turn to outside sources (often large suppliers) to access
them. Providing a more effective, lower cost alternative for delivering these
competencies for biotechs, as well as for larger PMA companies with products
outside of their strategic focus, will be a key factor in Newco's success. It is
our opinion that few, if any, commercialization service companies currently
exist in oncology therapeutics/diagnostics.

IV.  Requirements for Success

a)   Business Asset/Competency Requirements

The Company recognizes that capitalizing on the identified opportunities through
the establishment of a product development company requires several assets or
competencies. Specifically, the ability to bring to market enhanced diagnostics
and therapeutics in oncology requires the following:

   .   Worldwide development (including regulatory)

   .   Product Pipeline

   .   Financial

   .   Organizational

   .   Manufacturing

Several strategies for accessing these competencies are available:

   .   Own

           - redeployment of existing competency

   .   Develop

           - internal building of competency for eventual ownership

   .   Contract

           - aligning with, or outsourcing from, an external entity to access 
             competency

The determination of which accessing strategy to use is essentially a function
of the extent to which the competency in question is a key driver of value in
the product or service. If it is a key value driver, the competency needs to be
owned, either through redeployment or internal development. If the competency
does not drive significant value, it can be contracted.

b)   Industry Competency Gaps


                                      10
<PAGE>
 
The Company believes that significant gaps in these required assets/competencies
exist among the large group of biotechnology companies, primarily in development
and manufacturing (and also marketing/sales). Previously, these companies have
turned to large pharmaceutical suppliers to access required competencies, in
return for which they relinquished a significant portion of the future product
revenue stream. The partnership between Elan and Cytogen, Newco, provides an
alternative vehicle for filling development and manufacturing gaps.
Biotechnology companies would be able to gain access to markets rapidly with
potentially enhanced product performance profiles via a focused development
process and utilization of novel drug delivery systems. In addition, applicable
products in oncology among larger pharmaceutical suppliers may benefit from
utilizing Newco's reformulation/commercialization expertise - and present a more
favorable economic argument than within the pharmaceutical parent.

Since the ability to develop, register and (especially) manufacture a product is
often not a key value driver for biotechs or suppliers (to the same extent that
it is for the product commercializer), the option to contract those
responsibilities to an outside entity such as Newco for greater efficiency and
effectiveness is often a preferred strategy.

c)   Parent Company Competencies

All of the requisite core competencies for bringing a product to market exist
among the parent companies, and the partnership thus brings to bear quickly a
relatively unique combination of assets:

Elan
- ----
 .     Development:  Recognized drug delivery expertise in enhancing the 
       -----------
       performance profile of new and existing products.
        
 .     Pipeline: Mid-term pipeline potential from EL530 and EL532, two early
       --------
       stage non-toxic differentiation agents for the treatment of multiple
       tumor types licensed from the National Cancer Institute.

 .     Financial: Solid financial condition with a proven track record in
       ---------
       establishing value-added joint ventures, strategic alliances and
       marketing partnerships.

 .     Organizational: Strategically organized to grow through both existing
       --------------
       competencies and products and external agreements and relationships.

 .     Manufacturing:  Highly efficient product manufacturing capabilities 
       -------------
       exceeding all world-wide regulatory requirements.

Cytogen
- -------

                                      11
<PAGE>
 
 .      Development: Proven track record and recognized clinical/regulatory
       -----------
       expertise in oncology -- one of 20 out of 1300 biotechnology companies to
       achieve FDA approval.

 .      Pipeline: Near to mid-term pipeline in diagnostic products, including
       --------
       ProstaScint-Technetium for prostate cancer staging and OncoScint-Breast
       for breast cancer staging.

 .      Manufacturing: One of seven biotechnology companies to receive an
       -------------
       Establishment License Application (ELA) for the manufacture of well-
       characterized biologics.

As discussed, the development and manufacturing competencies will be the areas
of greatest need for Newco's prospective customers. However, the research
and drug delivery competencies provided by the parents are important
competencies as well, particularly for Newco's ability to access differentiated
oncology products internally.

V.   Newco Business Description

a)   Business Objectives

Newco will be formed as a "virtual" company, accessing each company's
assets/competencies to create a unique combination of core competencies designed
to provide the most efficient and effective development channel for
differentiated oncology products. In doing so, Newco will be well positioned to
reduce many of the risks inherent in the development of new products. Efficiency
in development will be derived from shared resources of Newco's parents, which
will deliver economies in product development and manufacturing processes.
Effectiveness will be derived from the design of more reliable clinical trial
results, more timely regulatory approval and application of novel drug delivery
technology to the compounds. The company believes that the provision of enhanced
efficiency and effectiveness will deliver a significant competitive advantage
for Newco over other development alternatives.

[Information omitted and filed separately with the Commission under Rule 24b-2.]

                                      12
<PAGE>
 
[Information omitted and filed separately with the Commission under Rule 24b-2.




                               ]

Near term, Newco will conduct its work through exclusive service contracts with
both Elan and Cytogen. Newco will thus have access to Elan's exceptional
pharmacokinetics and formulation programs, and any other drug development areas
that might be needed in the development and manufacture of a Newco product.
Newco will contract with Cytogen's clinical and regulatory group, which has
significant expertise in the development of oncology products, to conduct
clinical trials, and prepare and file all NDAs/PLAs. Newco may also contract
with one or more of the parents for product manufacturing. Newco may also
potentially benefit from parent company capabilities that go beyond late stage
product development (e.g. research, delivery, marketing).

c)         Product Selection Criteria

[Information omitted and filed separately with the Commission under Rule 24b-2.





                               ]

d)   Potential Products for In-licensing


[Information omitted and filed separately with the Commission under Rule 24b-2.]

                                      13
<PAGE>
 
[Information omitted and filed separately with the Commission under Rule 24b-2. 

                            ]





e)  Operations and Management

Initially, the primary organizational responsibilities for Newco will be focused
on:

 .     Managing the clinical development programs for existing products

 .     Managing the financial performance of the Company
                      
 .     Ensuring that only those products meeting selected criteria are developed
      or in-licensed

 .     Sufficiently differentiating the products to attract appropriate marketing
      partners

Newco's staffing requirements are, therefore, limited to the following:

 .     A Chief Scientific Officer/General Manager (CSO) with experience in
      efficient/expedited drug development programs and with relevant medical
      knowledge. It is important that this individual has extensive contacts in
      both cancer research institutions and cancer companies and is capable of
      managing external partners and a dedication to building a highly
      successful company.

 .     A project manager with experience in clinical development, data management
      and cost center management.

The CSO will also be a member of the Board of Directors.

VI.   Investments and Returns

V.    Legal Structure and Governance -- THESE SECTIONS DELETED. TO BE INCLUDED
      IN LEGAL SECTION -- moved to end of file

VIII. Cytogen Profile

a)    Company Overview

Cytogen is a biotechnology company engaged in the discovery, development and
marketing of products to better diagnose and treat cancer. The current portfolio
of products provided targeted delivery of diagnostic and therapeutic substances
directly to the sites of the disease. During the past fifteen years, Cytogen has
three FDA approvals -

                                      14
<PAGE>
 
first, OncoScint CR/OV for single administration as a diagnostic agent in
ovarian cancer, second, OncoScint CR/OV for single administration as a
diagnostic agent in colon cancer, and third, repeat use of OncoScint CR/OV as a
diagnostic agent for ovarian and colon cancer. FDA has also filed and is
currently reviewing two additional CYTOGEN applications - the PLA for
ProstaScint and the NDA for Quadramet. The Company has participated in two FDA
advisory meetings - one OncoScint in 1 _ 1 and one for ProstaScint in 1 _ 6. In
both meetings, the advisory committee members voted unanimously in favor of
CYTOGEN's products.

Cytogen's strategic value is centered around its capabilities and experience in
developing, and bringing to market, products that target specific cancers. The
Company's focus is on the further development of its internal pipeline, the
in-licensing of complementary late stage products, and mutually profitable
acquisitions and mergers that augment Cytogen's primary goal of being a leading
biotechnology firm. Cytogen's ability to receive FDA approval of its first
product is the competitive advantage Cytogen is using to capitalize on the
consolidation occurring throughout the biotech and pharmaceutical market.

Cytogen recently completed a merger with Cellcor, Inc. Cellcor is a
biotechnology company focused on the development and commercialization of
autolymphocyte therapy (ALT), a proprietary immunotherapy using a patient's own
immune cells to treat cancer and certain infectious diseases. The Company's
first product based on the ALT technology is for metastatic kidney cancer, renal
cell carcinoma (RCC). The RCC product has received Orphan Drug status from the
FDA and is in Phase III development. Patient accrual for this trial is complete.
Results of this trial are expected to be available in the 4th quarter of 1 _ 6.
A PLA is expected to be submitted in early 1997.

One of the key reasons Cytogen was able to complete this merger is reflected in
Gary Cashon's Chairman of Cellcor and General Partner of Hillman Medical
Ventures, statement to stockholders, "Cytogen's expertise in cancer, its status
as one of a select group of biotech companies to receive FDA approval for a drug
and its next generation technology based on peptides and combinatorial
chemistries, add important resources and capabilities to Cellcor. The merger has
the potential to provide better products for cancer patients and in turn,
benefit both Cellcor and Cytogen stockholders."

The Company's first commercial product, OncoScint CR/OV, is a monoclonal
antibody-based imaging agent for the detection of colorectal and ovarian
cancers. It was approved by the FDA and marketed in early 1993 for single
administration use and was recently approved for multiple use. OncoScint CR/OV
meets the need for better, more accurate information about the extent and
location of malignant tumors in patients with colorectal or ovarian cancer. To
best treat patients, physicians need to know where cancer is located within the
body, and if and how far it has spread. OncoScint CR/OV provides this
information, without the risk and costs of exploratory surgery. This product is
also being developed as a diagnostic agent for the pre-operative staging of
breast cancer patients.

b)     Core Competencies

 .      Product Pipeline
       ----------------

                                      15
<PAGE>
 
In addition to OncoScint CR/OV and OncoScint-Breast, Cytogen currently has two
other products which have completed Phase III human clinical trials -
ProstaScint and Quadramet. Product applications for both products have been
filed with FDA. ProstaScint, a monoclonal antibody-based imaging agent for the
diagnosis and staging of disease in patients with prostate cancer, was filed
with FDA in March, 1995. The original version of ProstaScint utilizes the
radioisotope indium-111. A second version of ProstaScint, currently in earlier
stage development, uses [Information omitted and filed separately with the
Commission under Rule 24b-2.]. Quadramet, the Company's cancer therapy agent for
the treatment of painful bone metastases, completed its second Phase III trial
in March, 1995. The New Drug Application (NDA) was officially filed by FDA in
August, 1995.

These products are analyzed in greater detail in subsequent sections.

 .      Second Generation Technology (GDL)
       ----------------------------------

Cytogen was founded on its strong scientific capability, an area which remains a
core competency today. First working with monoclonal antibodies, followed by the
exploration of antibody fragments, Cytogen scientists are currently focused on a
second generation technology based on a propriety method for identifying long
peptides that can mimic natural proteins in terms of their folding and their
corresponding molecular recognition functions. This new program is referred to
as the Genetic Diversity Library (GDL) Technology. The GDL Technology evolved
from the collaboration with a group of researchers at the University of North
Carolina, from which Cytogen scientists have been able to develop systems which
express vast libraries of folded peptides which can be screened for desired
properties.

 .      Clinical Development and Registration of Oncology Products
       ----------------------------------------------------------

Cytogen has proven capabilities in the areas of clinical development, data
management, and regulatory affairs, as well as in-house expertise in the field
of oncology, immunology/inflammation, pain relief, radiopharmaceuticals, and
diagnostic imaging. The Company has developed biotechnology products and has
established excellent working relationships both with the Center of Biologics
Evaluation and Research (CBER) and the Center for Drug Evaluation and Research
(CDER). Cytogen has broad experience with all aspects of Phase I through Phase
IV clinical trials, including assembly of IND's, protocol design and
implementation, case report form design, study site start-up and monitoring,
data retrieval, in-house data auditing and processing, biostatistical analysis,
and NDA/PLA preparation and submission.

Cytogen has experience with foreign regulatory submissions and has managed Phase
III clinical trials in Europe. The Company has successfully defended a product
submission before the CPMP on behalf of a European licensee.

Cytogen's Medical Affairs Group performed all the clinical development work
leading to FDA approval in December 1992 of the first monoclonal antibody-based
in vivo diagnostic agent for cancer (OncoScint CR/OV). This agent was
successfully defended in front of the CPMP and was approved by the European
regulatory agency in June, 1991.

                                      16
<PAGE>
 
Subsequently, Cytogen has completed Phase I-III trials of a similar agent for
the detection of prostate cancer (ProstaScint). The PLA for this product was
filed in January of 1995 and this agent is currently under active review. In
addition, the Medical Affairs Group successfully managed and completed a
multinational Phase III program for Quadramet, a radiopharmaceutical agent which
targets sites for active bone turnover and relieves pain associated with
osteoblastic bone metastases. The NDA for this product was filed in June 1995,
and this agent is also undergoing review at the agency. [Information omitted and
filed separately with the Commission under Rule 24b-2.]

Cytogen's Medical Affairs Group focuses on up-front planning and rapid conduct
of clinical trials. All clinical development programs are designed in concert
with experts from appropriate Scientific and medical disciplines. Indications
for product use are defined up front and studies are designed accordingly. A key
goal in Cytogen's clinical development programs is to accrue the minimum number
of patients necessary to obtain regulatory approvals yet ensure the broadest
possible use. Whenever possible, cost-benefit issues are also evaluated in Phase
III trials.

Having an FDA-approved product sets Cytogen apart from its competitors. Cytogen
is one of only fifteen biotechnology companies that have received the FDA
marketing approval. Cytogen's proven expertise in clinical development is the
competitive advantage that will be used to attract additional development
projects and fuel the expansion of Newco.

       Quadramet:  A Case Study:
       -------------------------

Cytogen has demonstrated the ability to significantly reduce the clinical
development time required for its lead commercial candidates. This achievement
has been accomplished by employing a focused critical mass of personnel at
crucial times during the clinical development process of each agent. This
approach melds the agility of a small biotech company and the resource diversity
of a large pharmaceutical company. The success attainable using this approach
can be seen in the results achieved in the clinical development of Quadramet.

At the time Cytogen acquired the rights for Quadramet from the Dow Chemical Co.,
the first of the two pivotal Phase III clinical trials (BA - 106/110) was
nearing completion. Dow had enrolled [*] patients in the trial using [*]
clinical sites in North America and [*] in Europe. Because of its experience in
conducting clinical trials in the area of prostate cancer, Cytogen was able to
very quickly add an additional [*] clinical sites in North America and [*] in
Europe for the second pivotal trial (424Sm10/11). Despite the fact that these
new "Cytogen" sites were somewhat delayed (compared to the pre-existing Dow
sites) in enrolling patients while the necessary regulatory approvals were
obtained, they eventually enrolled [*] of the [*] patients who took part in the
second Phase III trial, thus reducing the time necessary to complete this final
trial.

This focused critical mass approach was also employed in the preparation of the
NDA submission for Quadramet. Since, per protocol, Cytogen was "blinded" as to
the results

* Information omitted and filed separately with the Commission under Rule 24b-2.

                                      17
<PAGE>
 
of Protocol 424Sm10/11, it was not possible to begin work on major portions of
the clinical section of the NDA until this study was completed. The last case
report form for Protocol 424Sm10/11 was brought in-house in mid-March 1995.
Nonetheless, the complete NDA for Quadramet was submitted to the FDA less than
12 weeks later on June 13, 1995. More importantly, the FDA reviewed the
submission and deemed it suitable for filing on August 11, 1995, within the
statutory limit for doing so.

This record can be contrasted with that of Mallinckrodt Medical's for
186Re-HEDP, a similar agent seeking a similar indication to Quadramet.
Mallinckrodt completed its clinical trials for 186Re-HEDP shortly after Cytogen
             ---------
began the final pivotal trial for Quadramet. The NDA for 186Re-HEDP was
- -----
submitted to the FDA 9-12 months after the completion of clinical trials, and
received a "refusal to file" evaluation from the FDA approximately two months
later. More than nine months after the original submission had been rejected, it
had not been resubmitted. Thus, Cytogen was able to overtake a potential
competitor in the race to the marketplace.


 .      Manufacturing
       -------------
 
In order to support the manufacturing distribution and sales of its products,
Cytogen found it necessary to commit significant resources to establishment of a
GMP manufacturing facility. In 1992, the Company received an Establishment
License Application (ELA) from FDA and has subsequently passed the pre-approval
inspection for the manufacture of ProstaScint. This facility is one of seven to
have received this status and is also conducting contract manufacturing for
several other biotech products.

 .      Marketing & Sales
       -----------------

Cytogen has a core sales force comprised of highly skilled nuclear medicine
technologists whose primary responsibility is the training and support of
nuclear medicine departments. In the past year, Cytogen focused its efforts on
the development of a new distribution and marketing approach that will limit the
use of its products to only those sites that are trained and certified in the
direct uses of technically-sophisticated products. This program, referred to as
Cytogen's Partners in Excellence program is designed to provide better quality
control, improve patient outcomes and enhance the overall cost-effectiveness of
these products.

IX.    OncoScint

a)     Product Description

OncoScint CR/OV (satumomab pendetide), an FDA-approved product, was the first
imaging agent of its kind for colorectal and ovarian cancer patients. The key
benefit of OncoScint CR/OV is its ability to identify the location and extent of
malignant disease, outside the liver (extrahepatic), and provide both the
physician and patient with information to determine the optimal surgical or
nonsurgical treatment.

                                      18
<PAGE>
 
OncoScint CR/OV is a monoclonal antibody that seeks out and attaches to a
particular antigen expressed on the surface of malignant colorectal and ovarian
tumors, wherever they are in the body. Attached to the antibody is an imaging
isotope (indium). Externally, a gamma camera scans the patient's torso, and
detects and records the gamma rays from the isotope. The end result is an image
that specifies the location and extent of the cancer.

The antigen OncoScint CR/OV targets, TAG-72, is also expressed in certain types
of breast cancer. A clinical development plan to determine the product's
potential use in the pre-operative staging of breast cancer patients to
determine axillary lymph node involvement is currently underway.

OncoScint CR/OV's expanded use in breast cancer is, in part, based on recent
peer reviewed findings published in the International Journal of Oncology by the
Director and senior researchers at the Istituto Nazionale Tulori, one of the
world's foremost cancer research centers, located in Milano, Italy. In this
study, 20 breast cancer patients who were candidates for mastectomies were
evaluated to determine axillary lymph node status prior to surgery. Of the
patients in the study who actually had tumor-involved lymph nodes, OncoScint
CR/OV detected the disease in the axillary lymph nodes in 91% of these patients.

b)     Target Market

According to the American Cancer Society, breast cancer is the most common
cancer in women and the second major cause of cancer death. Approximately
182,000 new cases of breast cancer will be diagnosed in 1995 in the U.S.

OncoScint CR/OV detects disease that is beyond the scope of standard diagnostic
modalities and plays an important role in diagnosing new patients as well as
those with a suspected recurrence of certain cancer. Physicians who currently
use OncoScint CR/OV indicate that the product consistently contributes useful
information by enabling the physician to determine the most cost effective and
efficient treatment and enhance patient management. Specific uses are as
follows:

 .      Presurgical staging to plan or potentially alter the surgical approach

 .      Enhanced (better defined) prognosis based on the stage of disease

 .      Monitoring patients at risk disease recurrence. In this setting, early
       detection may result in selection of additional treatment options.

c)     Development Plan and Status

The purpose of Cytogen's multicenter clinical study in breast cancer is to
confirm the ability of OncoScint CR/OV to detect lymph node metastases in
patients with primary breast tumors. Because involvement of axillary lymph nodes
in breast cancer patients is the single most important prognostic factor in
assessing risks, most patients suspected of

                                      19
<PAGE>
 
having axillary lymph node involvement currently must undergo an invasive
surgical procedure i.e., a complete axillary lymph node dissection, to confirm
whether the cancer has spread to the lymph nodes. This method provides
information regarding the existence of distant disease, but leaves many of the
patients with painful and life-long disfigurement. Additionally, this invasive
diagnostic surgery does not improve survival from the disease. As a result,
there is a clear unmet patient need for a non-invasive diagnostic method that
can pre-operatively identify those patients whose diseases has spread to the
lymph nodes versus those whose cancer is confined to the breast.


d)     Market Position

Because it is the "first of its kind", OncoScint CR/OV has been a difficult
product to market. Nuclear physicians as well as referring physicians are still
learning how to actually use the product and to interpret the information
obtained from the scan. Cytogen sees several contingencies that may improve the
use of OncoScint CR/OV in the commercial setting and, in turn, increase sales.
These include:

[Information omitted and filed separately with the Commission under Rule 24b-2.









                            ]



OncoScint CR/OV is available through the nuclear medicine department of the
patient's hospital and is administered on an outpatient basis. The process is
safe and painless - OncoScint CR/OV and the isotope are injected and the
scanning procedure is completed between 24-120 hours later. Results are
available immediately.

X.     ProstaScint

a)     Product Description

ProstaScint (capromab pendetide) is an innovative diagnostic imaging agent which
has been developed by Cytogen to more accurately detect the extent and location
of prostate cancer. ProstaScint is a monoclonal antibody that seeks out and
attaches to a particular antigen expressed on the surface of malignant prostate
tumors, wherever they are in the body. Attached to the antibody is an imaging
isotope (in this case, indium). Externally, a gamma camera scans the patient's
torso, detects and records the gamma rays from the isotope. The end result is an
image that specifies the location and extent of the cancer.

                                      20
<PAGE>
 
[Information omitted and filed separately with the Commission under Rule 24b-2.]
The original version of ProstaScint (which uses indium as its radioisotope) has
completed all three phases of human clinical studies, conducted in over 30
leading medical institutions in this country. The product License Application
(PLA) to obtain marketing approval was submitted to the United States Food and
Drug Administration (FDA) in January 1995 and subsequently filed by FDA in
March. The product is under active review and is likely to be presented to a FDA
Advisory Committee meeting in the first quarter of 1996.

b)     Target Market

According to the American Cancer Society, 244,000 men will be newly diagnosed
with prostate cancer this year in the United States. The total number of men in
the U.S. previously diagnosed with prostate cancer is estimated to be between
one and four million. The potential target population for ProstaScint includes
the patients who are candidates for definitive primary therapy, as well as those
who have had recurrent disease following definitive therapy.

The following refers to the pre-surgical evaluation of patients with prostate
cancer:

       "The information provided by ProstaScint regarding the presence and
       location of prostate cancer, prior to surgery, is potentially significant
       in determining the optimal treatment for these patients."

       John K. Burgers, MD
       Urologic Surgeon
       Riverside Hospital, Ohio

The following refers to post-radical prostatectomy follow-up of prostate cancer
patients:

       "...many of these patients were scheduled for radiotherapy of the
       pelvis...However, the ProstaScint scan revealed occult sites of disease
       outside of this area, indicating that the patients would be unlikely to
       benefit from local therapy."

       Daniel Petrylak, MD
       Assistant Professor, Medical Oncology
       Columbia Presbyterian Medical Center
       New York, NY

c)     Development Plan and Status

This program will include preclinical trials to establish the biodistribution of
this product as compared to ProstaScint-Indium. [Information omitted and filed
separately with the Commission under Rule 24b-2.]

                                      21
<PAGE>
 
[Information omitted and filed separately with the Commission under Rule 24b-2.]


d)     Current Market Position

Currently, there are no non-invasive diagnostic modalities which are able to
detect prostate cancer outside of the prostatic bed before it spreads to the
bone. To date, clinical studies with ProstaScint, in pre-surgical patients and
patients with suspected recurrence, demonstrated that the product is able to
identify the location and extent of malignant disease - disease which goes
undetected by current modalities. As a result, a prostate cancer diagnosis
imaging agent like ProstaScint provides additional information to the urologist
to better determine the optimal surgical or nonsurgical treatment. This
information may prove critical to enhanced patient management and cost effective
medicine. It is estimated that 80,000 radical prostatectomies, at an average
cost of $20,000 are conducted per year of which approximately 50% are
unnecessary.

[Information omitted and filed separately with the Commission under Rule 24b-2.]
would offer advantages over the indium based first product. [Information omitted
and filed separately with the Commission under Rule 24b-2.] is significantly
less expensive - $X per dose versus [Information omitted and filed separately
with the Commission under Rule 24b-2.] for an indium dose and is cleared through
the body more rapidly allowing for a scan in 12 hours versus 72.

XI.    Elan Profile

a)     Company Overview

Elan is a leading drug delivery company which currently has more than fifty
products in development (10-15 estimated to be in late stage) that utilize
eleven different proprietary technologies. Sales of products that use Elan's
technologies exceed $1 billion annually. Today, Elan derives its revenues from
four sources: manufacturing/distribution, royalties, licensing fees and
research/contracts. Recognizing several years ago the limitations of being a
"contract" development company, Elan has been transitioning into a more fully
integrated pharmaceutical company. In order to reduce its reliance on
pharmaceutical development partners, Elan reformulated its strategy in 1993. The
company's two primary strategic objectives are to:

[Information omitted and filed separately with the Commission under Rule 24b-2.]

To help it achieve its objectives, Elan has made strategic acquisitions, entered
into joint venture arrangements and formed product development alliances.
Efforts to develop new chemical entities (NCEs) have been primarily conducted
through Advanced Therapeutic Systems (ATS), Elan's R&D affiliate. Recently
formed drug delivery alliances are with:

                                      22
<PAGE>
 
 .      Nale - a minority owned company created by Elan that is focused on
       ----
       commercializing complex generic products.

 .      Dura Pharmaceuticals - a respiratory drug delivery company
       --------------------

 .      Athena Neurosciences - a small biotechnology company specializing in
       --------------------
       central nervous system (CNS) products

Products delivered through Elan's technology include Cardizem (CD and SR), a
very successful calcium channel blocker used to treat hypertension. Cardizem,
launched by Marion Merell Dow and currently marketed by Hoechst Marion Roussel,
has been a leading driver of company revenues for several years. Looking ahead,
revenues are expected to be driven largely by Naprelan, a new formulation of
naproxen, a leading non-steroidal anti-inflammatory (NSAID) compound. With the
recent transfer of marketing rights to American Homes Products from
Roche/Syntex, Naprelan is projected to capture 20-30% of naproxen prescriptions,
and generate up to $200 million or more in sales.

b)     Core Competencies


[Information omitted and filed separately with the Commission under Rule 24b-2.]

                                      23
<PAGE>
 
[Information omitted and filed separately with the Commission under Rule 24b-2.














                        ]




OLD SECTIONS

Investments

Legal structure and Governance

a)     Sources and Timing of Returns

                                      24
<PAGE>
 
[Information omitted and filed separately with the Commission under Rule 24b-2.








                               ]

b)     Investments

[Information omitted and filed separately with the Commission under Rule 24b-2.









                               ]

c)     [Information omitted and filed separately with the Commission under Rule
24b-2.]

                                      25
<PAGE>
 
[Information omitted and filed separately with the Commission under Rule 24b-2.

                                                  ]


Based on preliminary analysis of development costs for Cytogen's [Information
omitted and filed separately with the Commission under Rule 24b-2.] and
OncoScint-Breast, the direct costs of Phase II-III clinical trials range from
[Information omitted and filed separately with the Commission under Rule 24b-2.]
per product per indication. These direct trial costs include grants, monitoring
labs, external agent/compound costs (e.g. radionuclides), CRF printing, medical
writing, FDA user fees and other trial costs. They do not include product
manufacturing costs or various overhead allocations.

Cost Categories:
- ---------------

 .      Clinical trial costs (see above)

 .      Manufacturing costs of products used in trials
       - COGS

 .      Personnel (salary + benefits) allocated to product development activities
       - biostatistican
       - CRA
       - medical director
       - data entry operators
       - others

 .      Miscellaneous overhead charges
       -fixtures, equipment
       - other

Product development costs are a function of both the number of patients and the
intensity of treatment/monitoring involved in a clinical trial. The most
appropriate and accurate way to project costs, therefore, is to analyze each
potential product's clinical trial needs separately and project costs
accordingly.

d)     [Information omitted and filed separately with the Commission under Rule
24b-2.


                               ]


VII.   Legal Structure and Governance

Determination of Newco's legal structure will include definition/assignment of
the

                                      26
<PAGE>
 
following:

       - company name 
       - legal form of business (TBD) 
       - Board of Directors -
       - Scientific Advisory Committee 
       - Management (previously discussed)

Governance:
- ----------

Newco will have a six member Board of Directors made up of two representatives
from Elan, two from Cytogen, one from Newco and one from industry. Newco will
utilize a Scientific Advisory Board made up of members of Newco's Board of
Directors and several outside experts in oncology and/or drug development to
advise management on product related development decisions and new product
opportunities.

                                      27
<PAGE>
 
                                   Exhibit B
                                   ---------
<PAGE>
 
                                                           Docket Family:  1813





                                                              Art = EL530/EL532

       PHENYLACETATE AND DERIVATIVES ALONE OR IN COMBINATION WITH OTHER
          COMPOUNDS AGAINST NEOPLASTIC CONDITIONS AND OTHER DISORDERS

                       EL530/532 (PA/PB and derivatives)

<TABLE> 
<CAPTION> 
                       
   Country/     Assignee/Patentee          Application No./          Publication       Patent           Status/Patent
  Docket No.                                Filing Date            Number/Public-  Number/Patent      Expiration Date
                                                                    ation Date      Issue Date  
<S>             <C>                        <C>                     <C>             <C>              <C> 
AUSTRALIA       US Gov't                    79737/94               WO 95/10271                      Pending - application filed; no
96.1813.AU                                  October 12, 1994                                        substantive action received

CANADA          US Gov't                    2173976                WO 95/10271                      Pending - application filed; no
96.1813C.CA                                                                                         substantive action received

CANADA          US Gov't                    2108963                                                 Pending - application filed; no
93.1813.CA                                  October 21, 1993       April 4, 1995                    substantive action received

INTERNATIONAL   US Gov't                    PCTUS/92/08875         WO 93/07866                      PCT Nat'l Phase entered
92.1813.PCT     #Countries/Regions 
                in App.:  1                 October 13, 1992       April 29, 1993

INTERNATIONAL   US Gov't                    PCT/US94/11492                                          PCT Nat'l Phase entered (only 
94.1813.PCT     #Countries/Regions in                                                               for PCT app.)
                App.:                       October 12, 1994

EPO             US Gov't                    94930694.8             0725635                          Pending - application filed; no
96.1813C.EP     # Countries in App.: 16                            August 14, 1996                  substantive action received

EPO             US Gov't                    92922550.6             0 567 613                        Pending - application filed; no
92.1813.EP      # Countries in App.: 15     October 13, 1992                                        substantive action received

ISRAEL          US Gov't                    103471                                                  Pending - substantive action
93.1813.IL                                  October 14, 1993                                        received

ISRAEL          US Gov't                    111251                                                  Pending - substantive action
94.1813C.IL                                 October 11, 1994                                        received

JAPAN           US Gov't                                           WO 95/10271                      Pending - application filed; no
96.1813.JP                                                                                          substantive action received

SOUTH KOREA     US Gov't                    96-701885              WO 95/10271                      Pending - application filed; no
96.1813.KR                                  April 12, 1996                                          substantive action received

NEW ZEALAND     US Gov't                    244850                                                  Pending - substantive action
93.1813.NZ                                  October 21, 1993                                        received

NEW ZEALAND     US Gov't                    270767                                                  Pending - application filed; no
95.1813C.NZ                                 March 21, 1995                                          substantive action received

NEW ZEALAND     US Gov't                    275673                 WO 95/10271                      Pending - application filed; no
96.1813C1.NZ                                May 6, 1996                                             substantive action received

PHILIPPINES     US Gov't                    46529                                                   Pending - application filed; no
93.1813.PH                                  July 16, 1993                                           substantive action received

PHILIPPINES     US Gov't                    49175                                                   Pending - application filed; no
94.1813C.PH                                 October 12, 1994                                        substantive action received
</TABLE> 

Intellectual Property Department   ELAN PATENT STATUS BOOK   September 26, 1996
Elan Pharmaceutical Research Corporation
<PAGE>
 
                                                             Docket Family: 1813

<TABLE> 
<CAPTION> 

   Country/     Assignee/Patentee    Application No./       Publication       Patent                       Status/Patent
  Docket No.                          Filing Date         Number/Public-   Number/Public-                 Expiration Date
                                                           ation Date        ation Date  
<S>             <C>                  <C>                  <C>              <C>                      <C> 
TAIWAN          US Gov't              82103224                                                      Pending - substantive action
93.1813.TI                            April 27, 1993                                                received

UNITED STATES   US Gov't              07/779,744                                                    Pending - rec'd final office
91.1813.US                            October 21, 1991                                              action

UNITED STATES   US Gov't              08/135,661                                                    Pending - paid grant fee
93.1813C.US                           October 12, 1993

UNITED STATES   US Gov't              08/207,521                                                    Pending - paid grant fee
94.1813C1.US                          March 7, 1994

UNITED STATES   US Gov't              08/469,466                                                    Pending - filed response to
95.1813C3.US                          June 6, 1995                                                  non-final OA

UNITED STATES   US Gov't              08/465941                                                     Pending - rec'd Notice of
95.1813C4.US                          June 6, 1995                                                  Allowance

UNITED STATES   US Gov't              08/470229                                                     Pending - paid grant fee
95.1813C5.US                          June 6, 1995

UNITED STATES   US Gov't              08/465924                                                     Pending - paid grant fee
95.1813C6.US                          June 6, 1995

UNITED STATES   US Gov't              08/465,835                                                    Pending - filed restriction
95.1813C7.US                          June 6, 1995                                                  requirement

UNITED STATES   US Gov't              08/469,961                                                    Pending - filed response to
95.1813C8.US                          June 6, 1995                                                  non-final OA

UNITED STATES   US Gov't              08/484817                                                     Pending - rec'd restriction
95.1813C2.US                          June 7, 1995                                                  requirement

UNITED STATES   US Gov't              08/478264                                                     Pending - filed restriction
95.1813C9.US                          June 7, 1995                                                  requirement

UNITED STATES   US Gov't              08/484615                                                     Pending - rec'd non-final
95.1813C10.US                         June 7, 1995                                                  office action

UNITED STATES   US Gov't              08/633,833                                                    Pending - application filed
95.1813C11.US                         April 11, 1996

SOUTH AFRICA    US Gov't              92/8140                                    92/8140            Granted
93.1813.ZA                            October 24, 1993                                              October 24, 2013

SOUTH AFRICA    US Gov't              94/7964                                    94/7964            Granted
94.1813C.ZA                           October 12, 1994                           May 29, 1996
</TABLE> 

Intellectual Property Department   ELAN PATENT STATUS BOOK   September 26, 1996
Elan Pharmaceutical Research Corporation
<PAGE>
 
                                                            Docket Family:  1814

                                                               Art = EL530/EL532



          COMPOSITIONS AND THERAPIES USING PHENYLACETIC ACID AND ITS
          DERIVATIVES IN COMBINATION WITH POLYUNSATURATED FATTY ACIDS

<TABLE> 
<CAPTION> 
                                                                                                       
 Country/Docket No.     Assignee/Patentee     Application         Publication           Patent        Status/Patent Expiration Date
                                              No./Filing Date   Number/Publication   Number/Patent 
                                                                       Date           Issue Date 
<S>                    <C>                    <C>               <C>                  <C>             <C> 
UNITED STATES          Elan Corporation, plc   08/352,534                                            Pending - rec'd non-final 
94.1814.US                                     December 9, 1994                                      office action
</TABLE> 

Intellectual Property Department   ELAN PATENT STATUS BOOK   September 26, 1996
Elan Pharmaceutical Research Corporation
<PAGE>
 
1.   [Information omitted and filed separetly with the Commission under Rule 
      24b-2.

2.                                                                           
                                                                             
                                                                             
3.                                                                           

                                                                             
4.                                                                           
                                                                             
                                                                             
5.                                                                           
                                                                             
                                                                             
6.                                                                           
                                                                             
                                                                             
7.                                                                           
                                                                             
                                                                             
8.                                                                           


9.                                                                          
                                                                            
                                                                             
10.                                                                          

                                                                             
11.                                                                    ]      
<PAGE>
 
                                   Exhibit C
                                   ---------
<PAGE>
 
     Oncotec(TM)

     Compound:
     murine monoclonal antibody B72.3, CYT-099, specifically labeled with
     technetium using CYTOGEN proprietary Tc linkers, for in vivo diagnostic use
     in humans.

     Intellectual Property Rights:
     Non-exclusive sublicense from CYTOGEN under the National Technical
     Information Service - CYTOGEN License Agreement (upon approval from NTIS)
     to U.S. Patents Nos. 4,522,918 and 4,612,282, subject to existing rights of
     first offer to third parties for marketing and promotion.

Prostatec(TM)

     Compound:
     murine monoclonal antibody 7E11-C5, CYT-351 specifically labeled with
     technetium, using CYTOGEN proprietary Tc linkers, for in vivo diagnostic
     use in humans.

     Intellectual Property Rights:
     Sublicense from CYTOGEN under the Horosziewicz - CYTOGEN Agreement to U.S.
     Patent No. 5,162,504, subject to existing rights of first offer to third
     parties for marketing and promotion.

PSMA

     Compound:
     therapeutic drugs designed to target or utilize the physiological activity
     of PSMA for treating Prostate Cancer in humans.

     Intellectual Property Rights:
     Sublicense from CYTOGEN under the Option and License Agreement between
     Sloan-Kettering Institute for Cancer Research and CYTOGEN (pending
     execution of the Option by CYTOGEN) to Patents:

     Israeli et al., Prostate-Specific Membrane Antigen
     U.S. Serial No. 07/973,337 Filed 11/5/92

     Israeli et al., Prostate-Specific Membrane Antigen
     U.S. Patent No. 5,538,866 Issued 7/23/96
     U.S. Serial No. 08/325,553 Filed 10/18/94

     Israeli et al., Prostate-Specific Membrane Antigen
     PCT Serial No. PCT/US93/10624 Filed 11/5/93
     Publication No. WO 94/09820, 5/11/94
<PAGE>
 
     Israeli et al., Prostate-Specific Membrane Antigen
     EPO Application No. EP94900538.3 Filed 6/1/95
     European Publication No. 668 777, 8/30/95
     Designated all EPO countries

     Israeli et al., Prostate-Specific Membrane Antigen
     Japan Application No. 511426/94 Filed 5/5/95

     Israeli et al., Prostate-Specific Membrane Antigen
     Canada Application No. 2,147,499 Filed 4/20/95

     Israeli et al., Prostate-Specific Membrane Antigen
     U.S. Serial No. 08/403,803 National App. Filed 3/14/95

     Israeli et al., Prostate-Specific Membrane Antigen and Uses Thereof
     U.S. Serial No. 08/394,152 Filed 2/24/95

     Israeli et al., Prostate-Specific Membrane Antigen and Uses Thereof
     PCT Application No. PCT/US96/02424 Filed 2/23/96

     Israeli et al., Prostate-Specific Membrane Antigen
     U.S. Serial No. 08/466,381 Filed 6/6/95

     Israeli et al., Prostate-Specific Membrane Antigen
     U.S. Serial No. 08/470,375 Filed 6/6/95

     Israeli et al., Prostate-Specific Membrane Antigen
     U.S. Serial No. 08/481,916 Filed 6/7/95

     Israeli et al., Prostate-Specific Membrane Antigen and Uses Thereof
     U.S. Serial No. (to be determined) Filed 8/29/96

for Prostate-Specific Membrane Antigen as a target for therapeutic drug design
technology utilizing the physiological activity of PSMA.  Vaccine, gene-therapy
and in vitro based assays are specifically excluded.
<PAGE>
 
                                    Exhibit D
                                    ---------

<PAGE>
 
                          CERTIFICATE OF INCORPORATION

                                       OF

                               TARGON CORPORATION



                                   ARTICLE I
                                   ---------

          The name of the corporation is Targon Corporation (the "Corporation").

                                   ARTICLE II
                                   ----------

          The address of the registered office of the Corporation in the State
of Delaware is 9 East Loockerman Street, City of Dover, County of Kent, Delaware
19901. The name of the registered agent of the Corporation at such address is
National Registered Agents, Inc.

                                  ARTICLE III
                                  -----------

          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.

                                   ARTICLE IV
                                   ----------

          The total number of shares of all classes of stock which the
Corporation shall have authority to issue is 5,000,000 shares, par value $.001
per share, of Common Stock.

                                   ARTICLE V
                                   ---------

          The name and mailing address of the incorporator is as follows:

               Name                            Mailing Address
               ----                            ---------------

Sanford Rosen                        c/o O'Sullivan Graev & Karabell, LLP
                                     30 Rockefeller Plaza
                                     41st Floor
                                     New York, NY  10112
                                     Attention:  David Robbins, Esq.

                                  ARTICLE VI
                                  ----------

          Prior to the time that the Corporation shall have initially registered
any of its shares of Common Stock under Section 12(b) or 12(g) of the Securities
Exchange Act of 1934, as amended (an "IPO"), the number of directors of the
Corporation shall be fixed at between four and ten, as provided 
<PAGE>
 
in the Corporation's By-laws and other agreements binding upon the Corporation.
Following an IPO, the number of directors of the Corporation shall be such as
from time to time shall be fixed in the manner provided in the By-laws of the
Corporation. The election of directors of the Corporation need not be by ballot
unless the By-laws so require.

                                  ARTICLE VII
                                  -----------

          A director of the Corporation shall not be personally liable to the
Corporation or its stockholders for monetary damages for breach of fiduciary
duty as a director, except for liability (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 Delaware General Corporation
Law, or (iv) for any transaction from which the director derived any improper
personal benefit. If the Delaware General Corporation Law is amended after the
date of incorporation of the Corporation to authorize corporate action further
eliminating or limiting the personal liability of directors, then the liability
of a director of the Corporation shall be eliminated or limited to the fullest
extent permitted by the Delaware General Corporation Law, as so amended.

          Any repeal or modification of the foregoing paragraph by the
stockholders of the Corporation shall not adversely affect any right or
protection of a director of the Corporation existing at the time of such repeal
or modification.

                                 ARTICLE VIII
                                 ------------

          For the management of the business and for the conduct of the affairs
of the Corporation, and in further definition, limitation and regulation of the
powers of the Corporation and of its directors and stockholders, it is further
provided:

          (a)  In furtherance and not in limitation of the powers conferred by
the laws of the State of Delaware, the Board of Directors is expressly
authorized and empowered:



                                      -2-
<PAGE>
 
                           (i)    to make, alter, amend or repeal the By-laws in
     any manner not inconsistent with the laws of the State of Delaware or this
     Certificate of Incorporation;

                           (ii)   without the assent or vote of the
     stockholders, to authorize and issue securities and obligations of the
     Corporation, secured or unsecured, and to include therein such provisions
     as to redemption, conversion or other terms thereof as the Board of
     Directors in its sole discretion may determine, and to authorize the
     mortgaging or pledging, as security therefor, of any property of the
     Corporation, real or personal, including after-acquired property;

                           (iii)  to determine whether any, and if any, what
     part, of the net profits of the Corporation or its surplus shall be
     declared in dividends and paid to the stockholders, and to direct and
     determine the use and disposition of any such net profits or such surplus;
     and

                           (iv)   to fix from time to time the amount of net
     profits of the Corporation or of its surplus to be reserved as working
     capital or for any other lawful purpose.

          In addition to the powers and authorities herein or by statute
expressly conferred upon it, the Board of Directors may exercise all such powers
and do all such acts and things as may be exercised or done by the Corporation,
subject, nevertheless, to the provisions of the laws of the State of Delaware,
of this Certificate of Incorporation and of the By-laws of the Corporation.

          (b)  Any director or any officer elected or appointed by the
stockholders or by the Board of Directors may be removed at any time in such
manner as shall be provided in the By-laws of the Corporation.

          (c)  From time to time any of the provisions of this Certificate of
Incorporation may be altered, amended or repealed, and other provisions
authorized by the laws of the State of Delaware at the time in force may be
added or inserted, in the manner and at the time prescribed by said laws, and
all rights at any time conferred upon the stockholders of the Corporation by
this Certificate of Incorporation are granted subject to the provisions of this
paragraph (c).

                                   ARTICLE IX
                                   ----------

          Whenever a compromise or arrangement is proposed between the
Corporation and its creditors or any class of them and/or between the
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 the Corporation or of any creditor or stockholder thereof or on the
application of any receiver or receivers appointed for the 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 the
Corporation under the provisions of Section 279 of Title 8 of the Delaware Code,


                                      -3-
<PAGE>
 
order a meeting of the creditors or class of creditors, and/or of the
stockholders or class of stockholders of the 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 the Corporation, as the
case may be, agree on any compromise or arrangement and to any reorganization of
the Corporation as a consequence of such compromise or arrangement, the said
compromise or arrangement and the said reorganization shall, if sanctioned by
the court to which the said application has been made, be binding on all the
creditors or class of creditors, and/or on all the stockholders or class of
stockholders, of the Corporation, as the case may be, and also on the
Corporation.

                                   ARTICLE X
                                   ---------

          The Corporation shall not institute proceedings to be adjudicated a
bankrupt or insolvent, or consent to the institution of bankruptcy or insolvency
proceedings against it, or file a petition or consent to a petition seeking
reorganization or relief under any applicable federal or state law relating to
bankruptcy, or consent to the appointment of a receiver, liquidator, assignee,
trustee, sequestrator or other similar official, of the Corporation or a
substantial part of its property, or make any assignment for the benefit of
creditors, or, except as required by law, admit in writing its inability to pay
its debts generally as they become due, or take any corporate action in
furtherance of any such action, without, in each case, the unanimous consent of
the Board of Directors, which consent must include the consent of an independent
director.

          IN WITNESS WHEREOF, I, the undersigned, being the sole incorporator
hereinabove-named, for the purpose of forming a corporation pursuant to the
General Corporation Law of the State of Delaware, DO HEREBY CERTIFY, under
penalties of perjury, that this is my act and deed and that the facts
hereinabove stated are truly set forth and, according, I have hereunto set my
hand as of the 25th day of September, 1996.




                                  /s/ Sanford Rosen
                                  ---------------------------------------------
                                  Sanford Rosen
                                  Sole Incorporator



                                      -4-
<PAGE>
 
===============================================================================


                               TARGON CORPORATION

                           Incorporated under the laws
                            of the State of Delaware









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

                                     BY-LAWS

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




                        As adopted on September 25, 1996





===============================================================================
<PAGE>
 
                               TARGON CORPORATION

                                     BY-LAWS

                                TABLE OF CONTENTS

<TABLE> 
<CAPTION>  
                                                                                                             Page
                                                                                                             ----
<S>        <C>         <C>                                                                                   <C>  
ARTICLE I - OFFICES.............................................................................................1

           SECTION 1.  Registered Office........................................................................1
           SECTION 2.  Other Offices............................................................................1

ARTICLE II - MEETING OF STOCKHOLDERS; STOCKHOLDERS' CONSENT IN LIEU OF MEETING..................................1

           SECTION 1.  Annual Meetings..........................................................................1
           SECTION 2.  Special Meetings.........................................................................1
           SECTION 3.  Notice of Meetings.......................................................................1
           SECTION 4.  Quorum...................................................................................2
           SECTION 5.  Organization.............................................................................2
           SECTION 6.  Order of Business........................................................................3
           SECTION 7.  Voting...................................................................................3
           SECTION 8.  Inspection...............................................................................4
           SECTION 9.  List of Stockholders.....................................................................4
           SECTION 10.  Stockholders' Consent in Lieu of Meeting................................................4

ARTICLE III - BOARD OF DIRECTORS................................................................................4

           SECTION 1.  General Powers...........................................................................4
           SECTION 2.  Number and Term of Office................................................................5
           SECTION 3.  Election of Directors....................................................................5
           SECTION 4.  Resignation, Removal and Vacancies.......................................................5
           SECTION 5.  Meetings.................................................................................6
           SECTION 6.  Directors' Consent in Lieu of Meeting....................................................7
           SECTION 7.  Action by Means of Conference Telephone or Similar Communications
                             Equipment..........................................................................7
           SECTION 8.  Committees...............................................................................7

ARTICLE IV - OFFICERS...........................................................................................7

           SECTION 1.  Executive Officers.......................................................................7
           SECTION 2.  Authority and Duties.....................................................................8
           SECTION 3.  Other Officers...........................................................................8
           SECTION 4.  Term of Office, Resignation and Removal..................................................8
</TABLE> 
                                      -i-
<PAGE>
 
<TABLE> 
<S>        <C>         <C>                                                                                      <C>        
           SECTION 5.  Vacancies................................................................................8
           SECTION 6.  The Chairman.............................................................................8
           SECTION 7.  The President............................................................................8
           SECTION 8.  The Secretary............................................................................9
           SECTION 9.  The Treasurer............................................................................9

ARTICLE V - CONTRACTS, CHECKS, DRAFTS, BANK ACCOUNTS, ETC.......................................................9

           SECTION 1.  Execution of Documents...................................................................9
           SECTION 2.  Deposits................................................................................10
           SECTION 3.  Proxies with Respect to Stock or Other Securities of Other Corporations.................10

ARTICLE VI - SHARES AND THEIR TRANSFER; FIXING RECORD DATE.....................................................10

           SECTION 1.  Certificates for Shares.................................................................10
           SECTION 2.  Record..................................................................................10
           SECTION 3.  Transfer and Registration of Stock......................................................11
           SECTION 4.  Addresses of Stockholders...............................................................11
           SECTION 5.  Lost, Destroyed and Mutilated Certificates..............................................11
           SECTION 6.  Regulations.............................................................................11
           SECTION 7.  Fixing Date for Determination of Stockholders of Record.................................11

ARTICLE VII - SEAL.............................................................................................13


ARTICLE VIII - FISCAL YEAR.....................................................................................13

ARTICLE IX - INDEMNIFICATION AND INSURANCE.....................................................................13
           SECTION 1.  Indemnification.........................................................................13
           SECTION 2.  Insurance...............................................................................15

ARTICLE X - AMENDMENT..........................................................................................15

</TABLE> 
                                     -ii-
<PAGE>
 
                                  BY-LAWS OF

                               TARGON CORPORATION

                                   ARTICLE I

                                    Offices
                                    -------

          SECTION 1. Registered Office. The registered office of Targon
                     -----------------
Corporation (the "Company") in the State of Delaware shall be at 9 East
Loockerman Street, City of Dover, County of Kent, Delaware 19901, and the
registered agent in charge thereof shall be The Prentice-Hall Corporation
System.

          SECTION 2. Other Offices. The Company may also have an office or
                     -------------
offices at any other place or places within or outside the State of Delaware.

                                  ARTICLE II

                     Meeting of Stockholders; Stockholders'
                           Consent in Lieu of Meeting
                           --------------------------

          SECTION 1. Annual Meetings. The annual meeting of the stockholders for
                     ---------------           
the election of directors, and for the transaction of such other business as may
properly come before the meeting, shall be held at such place, date and hour as
shall be fixed by the Board of Directors (the "Board") and designated in the
notice or waiver of notice thereof, except that no annual meeting need be held
if all actions, including the election of directors, required by the General
Corporation Law of the State of Delaware (the "Delaware Statute") to be taken at
a stockholders' annual meeting are taken by written consent in lieu of meeting
pursuant to Section 10 of this Article II.

          SECTION 2. Special Meetings. A special meeting of the stockholders for
                     ---------------- 
any purpose or purposes may be called by the Board, the Chairman, the President
or the record holders of at least 40% of the issued and outstanding shares of
Common Stock of the Company, to be held at such place, date and hour as shall be
designated in the notice or waiver of notice thereof.

          SECTION 3. Notice of Meetings. Except as otherwise required by
                     ------------------
statute, the Certificate of Incorporation of the Company (the "Certificate") or
these By-laws, notice of each annual or special meeting of the stockholders
shall be given to each stockholder of record entitled to vote at such meeting
not less than 10 nor more than 60 days before the day on which the meeting is to
be held, by delivering written notice thereof to him personally, or by mailing a
copy of such notice, postage prepaid, directly to him at his address as it
appears in the records of the Company, or by transmitting such notice thereof to
him at such address by telegraph, cable or other telephonic transmission. Every
such notice shall state the place, the date and hour of the meeting, and, in
case of a special meeting, the purpose or purposes for which the meeting is
called. Notice of any meeting of stockholders shall not be required to be given
to any stockholder
<PAGE>
 
who shall attend such meeting in person or by proxy, or who shall, in person or
by attorney thereunto authorized, waive such notice in writing, either before or
after such meeting. Except as otherwise provided in these By-laws, neither the
business to be transacted at, nor the purpose of, any meeting of the
stockholders need be specified in any such notice or waiver of notice. Notice of
any adjourned meeting of stockholders shall not be required to be given, except
when expressly required by law.

          SECTION 4. Quorum. At each meeting of the stockholders, except where
                     ------
otherwise provided by the Certificate or these By-laws, the holders of a
majority of the issued and outstanding shares of Common Stock of the Company
entitled to vote at such meeting, present in person or represented by proxy,
shall constitute a quorum for the transaction of business. In the absence of a
quorum, a majority in interest of the stockholders present in person or
represented by proxy and entitled to vote, or, in the absence of all the
stockholders entitled to vote, any officer entitled to preside at, or act as
secretary of, such meeting, shall have the power to adjourn the meeting from
time to time, until stockholders holding the requisite amount of stock to
constitute a quorum shall be present or represented. At any such adjourned
meeting at which a quorum shall be present, any business may be transacted which
might have been transacted at the meeting as originally called.

          SECTION 5. Organization.
                     ------------

               (a)   Unless otherwise determined by the Board, at each meeting
of the stockholders, one of the following shall act as chairman of the meeting
and preside thereat, in the following order of precedence:

                     (i)   the Chairman;

                     (ii)  the President;

                     (iii) any director, officer or stockholder of the Company
           designated by the Board to act as chairman of such meeting and to
           preside thereat if the Chairman or the President shall be absent from
           such meeting; or

                     (iv)  a stockholder of record who shall be chosen chairman
           of such meeting by a majority in voting interest of the stockholders
           present in person or by proxy and entitled to vote thereat.

               (b)   The Secretary or, if he shall be presiding over such
meeting in accordance with the provisions of this Section 5 or if he shall be
absent from such meeting, the person (who shall be an Assistant Secretary, if an
Assistant Secretary has been appointed and is present) whom the chairman of such
meeting shall appoint, shall act as secretary of such meeting and keep the
minutes thereof.


                                      -2-
<PAGE>
 
          SECTION 6. Order of Business. The order of business at each meeting of
                     -----------------
the stockholders shall be determined by the chairman of such meeting, but such
order of business may be changed by a majority in voting interest of those
present in person or by proxy at such meeting and entitled to vote thereat.

          SECTION 7. Voting. Except as otherwise provided by law, the
                     ------
Certificate or these By-laws, at each meeting of the stockholders, every
stockholder of the Company shall be entitled to one vote in person or by proxy
for each share of Common Stock of the Company held by him and registered in his
name on the books of the Company on the date fixed pursuant to Section 7 of
Article VI as the record date for the determination of stockholders entitled to
vote at such meeting. Persons holding stock in a fiduciary capacity shall be
entitled to vote the shares so held. A person whose stock is pledged shall be
entitled to vote, unless, in the transfer by the pledgor on the books of the
Company, he has expressly empowered the pledgee to vote thereon, in which case
only the pledgee or his proxy may represent such stock and vote thereon. If
shares or other securities having voting power stand in the record of two or
more persons, whether fiduciaries, members of a partnership, joint tenants,
tenants in common, tenants by the entirety or otherwise, or if two or more
persons have the same fiduciary relationship respecting the same shares, unless
the Secretary shall be given written notice to the contrary and furnished with a
copy of the instrument or order appointing them or creating the relationship
wherein it is so provided, their acts with respect to voting shall have the
following effect:

               (a)  if only one votes, his act binds all;

               (b)  if more than one votes, the act of the majority so voting
binds all; and

               (c)  if more than one votes, but the vote is evenly split on any
particular matter, such shares shall be voted in the manner provided by law.

If the instrument so filed shows that any such tenancy is held in unequal
interests, a majority or even-split for the purposes of this Section 7 shall be
a majority or even-split in interest. The Company shall not vote directly or
indirectly any share of its own capital stock. Any vote of stock may be given by
the stockholder entitled thereto in person or by his proxy appointed by an
instrument in writing, subscribed by such stockholder or by his attorney
thereunto authorized, delivered to the secretary of the meeting; provided,
                                                                 --------
however, that no proxy shall be voted after three years from its date, unless
- -------
said proxy provides for a longer period. At all meetings of the stockholders,
all matters (except where other provision is made by law, the Certificate or
these By-laws) shall be decided by the vote of a majority in interest of the
stockholders present in person or by proxy at such meeting and entitled to vote
thereon, a quorum being present. Unless demanded by a stockholder present in
person or by proxy at any meeting and entitled to vote thereon, the vote on any
question need not be by ballot. Upon a demand by any such stockholder for a vote
by ballot upon any question, such vote by ballot shall be taken. On a vote by
ballot, each 

                                      -3-
<PAGE>
 
ballot shall be signed by the stockholder voting, or by his proxy, if there be
such proxy, and shall state the number of shares voted.

          SECTION 8. Inspection. The chairman of the meeting may at any time
                     ----------
appoint one or more inspectors to serve at any meeting of the stockholders. Any
inspector may be removed, and a new inspector or inspectors appointed, by the
Board at any time. Such inspectors shall decide upon the qualifications of
voters, accept and count votes, declare the results of such vote, and subscribe
and deliver to the secretary of the meeting a certificate stating the number of
shares of stock issued and outstanding and entitled to vote thereon and the
number of shares voted for and against the question, respectively. The
inspectors need not be stockholders of the Company, and any director or officer
of the Company may be an inspector on any question other than a vote for or
against his election to any position with the Company or on any other matter in
which he may be directly interested. Before acting as herein provided, each
inspector shall subscribe an oath faithfully to execute the duties of an
inspector with strict impartiality and according to the best of his ability.

          SECTION 9. List of Stockholders. It shall be the duty of the Secretary
                     --------------------
or other officer of the Company who shall have charge of its stock ledger to
prepare and make, at least 10 days before every meeting of the stockholders, a
complete list of the stockholders entitled to vote thereat, arranged in
alphabetical order, and showing the address of each stockholder and the number
of shares registered in the name of each stockholder. Such list shall be open to
the examination of any stockholder, for any purpose germane to any such meeting,
during ordinary business hours, for a period of at least 10 days prior to such
meeting, either at a place within the city where such meeting is to be held,
which place shall be specified in the notice of the meeting or, if not so
specified, at the place where the meeting is to be held. Such list shall also be
produced and kept at the time and place of the meeting during the whole time
thereof, and may be inspected by any stockholder who is present.

          SECTION 10. Stockholders' Consent in Lieu of Meeting. Any action
                      ----------------------------------------
required by the Delaware Statute to be taken at any annual or special meeting of
the stockholders of the Company, or any action which may be taken at any annual
or special meeting of such stockholders, may be taken without a meeting, without
prior notice and without a vote, by a consent in writing, as permitted by the
Delaware Statute.

                                  ARTICLE III

                               Board of Directors
                               ------------------  

          SECTION 1. General Powers. The business, property and affairs of the
                     --------------
Company shall be managed by or under the direction of the Board, which may
exercise all such powers of the Company and do all such lawful acts and things
as are not by law or by the Certificate directed or required to be exercised or
done by the stockholders.


                                      -4-
<PAGE>
 
          SECTION 2. Number and Term of Office. Prior to the time that the
                     -------------------------
Company shall have initially registered any of its shares of Common Stock under
Section 12(b) or 12(g) of the Securities Exchange Act of 1934, as amended (an
"IPO"), the number of directors of the Company shall be fixed at between four
and ten, as determined by the Board. Following an IPO, the number of directors
shall be fixed from time to time by the Board. Directors need not be
stockholders. Each director shall hold office until his successor is elected and
qualified, or until his earlier death or resignation or removal in the manner
hereinafter provided.

          SECTION 3. Election of Directors. Prior to an IPO, two directors shall
                     ---------------------
be elected by the holders of a majority of the outstanding shares of Class A
Common Stock, and two directors shall be elected by the holders of a majority of
the outstanding shares of Class B Common Stock. At each meeting of the
stockholders for the election of directors at which a quorum is present, the
persons receiving the greatest number of votes, up to the number of directors to
be elected, of the stockholders present in person or by proxy and entitled to
vote thereon shall be the directors; provided, however, that for purposes of
                                     --------  -------
such vote no stockholder shall be allowed to cumulate his votes. Unless an
election by ballot shall be demanded as provided in Section 7 of Article II,
election of directors may be conducted in any manner approved at such meeting.

          SECTION 4. Resignation, Removal and Vacancies.
                     ----------------------------------

                (a)  Any director may resign at any time by giving written
notice to the Board, the Chairman, the President or the Secretary. Such
resignation shall take effect at the time specified therein or, if the time be
not specified, upon receipt thereof; unless otherwise specified therein, the
acceptance of such resignation shall not be necessary to make it effective.

                (b)  Any director or the entire Board may be removed, with or
without cause, at any time by vote of the holders of a majority of the shares
then entitled to vote at an election of directors or by written consent of the
stockholders pursuant to Section 10 of Article II.

                (c)  Vacancies occurring on the Board for any reason may be
filled by vote of the stockholders or by the stockholders' written consent
pursuant to Section l0 of Article II, or by vote of the Board or by the
directors' written consent pursuant to Section 6 of this Article III. If the
number of directors then in office is less than a quorum, such vacancies may be
filled by a vote of a majority of the directors then in office.

          SECTION 5. Meetings.
                     --------

                (a)  Annual Meetings. As soon as practicable after each annual
                     ---------------  
election of directors, the Board shall meet for the purpose of organization and
the transaction of other business, unless it shall have transacted all such
business by written consent pursuant to Section 6 of this Article III.

                                      -5-
<PAGE>
 
        (b)  Other Meetings. Other meetings of the Board shall be held at such
             --------------
times and places as the Board, the Chairman, the President or any director shall
from time to time determine.

        (c)  Notice of Meetings. Notice shall be given to each director of each
             ------------------
meeting, including the time, place and purpose of such meeting. Notice of each
such meeting shall be mailed to each director, addressed to him at his residence
or usual place of business, at least two days before the date on which such
meeting is to be held, or shall be sent to him at such place by telegraph,
cable, wireless or other form of recorded communication, or be delivered
personally or by telephone not later than the day before the day on which such
meeting is to be held, but notice need not be given to any director who shall
attend such meeting. A written waiver of notice, signed by the person entitled
thereto, whether before or after the time of the meeting stated therein, shall
be deemed equivalent to notice.

        (d)  Place of Meetings. The Board may hold its meetings at such place or
             -----------------
places within or outside the State of Delaware as the Board may from time to
time determine, or as shall be designated in the respective notices or waivers
of notice thereof.

        (e)  Quorum and Manner of Acting. A majority of the total number of
             ---------------------------
directors then in office shall be present in person at any meeting of the Board
in order to constitute a quorum for the transaction of business at such meeting,
and the vote of a majority of those directors present at any such meeting at
which a quorum is present shall be necessary for the passage of any resolution
or act of the Board, except as otherwise expressly required by law or these By-
laws. In the absence of a quorum for any such meeting, a majority of the
directors present thereat may adjourn such meeting from time to time until a
quorum shall be present.

        (f)  Organization. At each meeting of the Board, one of the following
             ------------
shall act as chairman of the meeting and preside thereat, in the following order
of precedence:

             (i)   the Chairman;

             (ii)  the President (if a director); or

             (iii) any director designated by a majority of the directors
     present.

The Secretary or, in the case of his absence, an Assistant Secretary, if an
Assistant Secretary has been appointed and is present, or any person whom the
chairman of the meeting shall appoint shall act as secretary of such meeting and
keep the minutes thereof.

     SECTION 6. Directors' Consent in Lieu of Meeting. Any action required or
                -------------------------------------
permitted to be taken at any meeting of the Board may be taken without a
meeting, without prior notice and without a vote, if a consent in writing,
setting forth the action so taken, shall be signed 

                                      -6-
<PAGE>
 
by all the directors then in office and such consent is filed with the minutes
of the proceedings of the Board.

          SECTION 7. Action by Means of Conference Telephone or Similar
                     --------------------------------------------------
Communications Equipment. Any one or more members of the Board may participate
- ------------------------
in a meeting of the Board by means of conference telephone or similar
communications equipment by which all persons participating in the meeting can
hear each other, and participation in a meeting by such means shall constitute
presence in person at such meeting.

          SECTION 8. Committees. The Board may, by resolution or resolutions
                     ----------
passed by a majority of the whole Board, designate one or more committees, each
such committee to consist of one or more directors of the Company, which to the
extent provided in said resolution or resolutions shall have and may exercise
the powers of the Board in the management of the business and affairs of the
Company and may authorize the seal of the Company to be affixed to all papers
which may require it, such committee or committees to have such name or names as
may be determined from time to time by resolution adopted by the Board. A
majority of all the members of any such committee may determine its action and
fix the time and place of its meetings, unless the Board shall otherwise
provide. The Board shall have power to change the members of any such committee
at any time, to fill vacancies and to discharge any such committee, either with
or without cause, at any time.

                                  ARTICLE IV

                                   Officers
                                   --------

          SECTION 1. Executive Officers. The principal officers of the Company
                     ------------------
shall be a Chairman, if one is appointed (and any references to the Chairman
shall not apply if a Chairman has not been appointed), a President, a Secretary,
and a Treasurer, and may include such other officers as the Board may appoint
pursuant to Section 3 of this Article IV. Any two or more offices may be held by
the same person.

          SECTION 2. Authority and Duties. All officers, as between themselves
                     --------------------
and the Company, shall have such authority and perform such duties in the
management of the Company as may be provided in these By-laws or, to the extent
so provided, by the Board.

          SECTION 3. Other Officers. The Company may have such other officers,
                     --------------
agents and employees as the Board may deem necessary, including one or more
Assistant Secretaries, one or more Assistant Treasurers and one or more Vice
Presidents, each of whom shall hold office for such period, have such authority,
and perform such duties as the Board, the Chairman, or the President may from
time to time determine. The Board may delegate to any principal officer the
power to appoint and define the authority and duties of, or remove, any such
officers, agents, or employees.

                                      -7-
<PAGE>
 
          SECTION 4. Term of Office, Resignation and Removal.
                     ---------------------------------------

              (a)    All officers shall be elected or appointed by the Board and
shall hold office for such term as may be prescribed by the Board. Each officer
shall hold office until his successor has been elected or appointed and
qualified or until his earlier death or resignation or removal in the manner
hereinafter provided. The Board may require any officer to give security for the
faithful performance of his duties.

              (b)    Any officer may resign at any time by giving written notice
to the Board, the Chairman, the President or the Secretary. Such resignation
shall take effect at the time specified therein or, if the time be not
specified, at the time it is accepted by action of the Board. Except as
aforesaid, the acceptance of such resignation shall not be necessary to make it
effective.

              (c)    All officers and agents elected or appointed by the Board
shall be subject to removal at any time by the Board or by the stockholders of
the Company with or without cause.

          SECTION 5. Vacancies. If the office of Chairman, President, Secretary
                     ---------
or Treasurer becomes vacant for any reason, the Board shall fill such vacancy,
and if any other office becomes vacant, the Board may fill such vacancy. Any
officer so appointed or elected by the Board shall serve only until such time as
the unexpired term of his predecessor shall have expired, unless reelected or
reappointed by the Board.

          SECTION 6. The Chairman. The Chairman shall give counsel and advice to
                     ------------
the Board and the officers of the Company on all subjects concerning the welfare
of the Company and the conduct of its business and shall perform such other
duties as the Board may from time to time determine. Unless otherwise determined
by the Board, he shall preside at meetings of the Board and of the Stockholders
at which he is present.

          SECTION 7. The President. The President shall be the chief executive
                     -------------
officer of the Company. The President shall have general and active management
and control of the business and affairs of the Company subject to the control of
the Board and shall see that all orders and resolutions of the Board are carried
into effect. The President shall from time to time make such reports of the
affairs of the Company as the Board of Directors may require and shall perform
such other duties as the Board may from time to time determine.

          SECTION 8. The Secretary. The Secretary shall, to the extent
                     -------------
practicable, attend all meetings of the Board and all meetings of the
stockholders and shall record all votes and the minutes of all proceedings in a
book to be kept for that purpose. He may give, or cause to be given, notice of
all meetings of the stockholders and of the Board, and shall perform such other
duties as may be prescribed by the Board, the Chairman or the President, under
whose supervision he shall act. He shall keep in safe custody the seal of the
Company and affix the

                                      -8-
<PAGE>
 
same to any duly authorized instrument requiring it and, when so affixed, it
shall be attested by his signature or by the signature of the Treasurer or, if
appointed, an Assistant Secretary or an Assistant Treasurer. He shall keep in
safe custody the certificate books and stockholder records and such other books
and records as the Board may direct, and shall perform all other duties incident
to the office of Secretary and such other duties as from time to time may be
assigned to him by the Board, the Chairman or the President.

          SECTION 9. The Treasurer. The Treasurer shall have the care and
                     -------------
custody of the corporate funds and other valuable effects, including securities,
shall keep full and accurate accounts of receipts and disbursements in books
belonging to the Company and shall deposit all moneys and other valuable effects
in the name and to the credit of the Company in such depositories as may be
designated by the Board. The Treasurer shall disburse the funds of the Company
as may be ordered by the Board, taking proper vouchers for such disbursements,
shall render to the Chairman, President and directors, at the regular meetings
of the Board, or whenever they may require it, an account of all his
transactions as Treasurer and of the financial condition of the Company and
shall perform all other duties incident to the office of Treasurer and such
other duties as from time to time may be assigned to him by the Board, the
Chairman or the President.

                                   ARTICLE V

                Contracts, Checks, Drafts, Bank Accounts, Etc.
                ----------------------------------------------

          SECTION 1. Execution of Documents. The Board shall designate, by
                     ----------------------
either specific or general resolution, the officers, employees and agents of the
Company who shall have the power to execute and deliver deeds, contracts,
mortgages, bonds, debentures, checks, drafts and other orders for the payment of
money and other documents for and in the name of the Company, and may authorize
such officers, employees and agents to delegate such power (including authority
to redelegate) by written instrument to other officers, employees or agents of
the Company; unless so designated or expressly authorized by these By-laws, no
officer, employee or agent shall have any power or authority to bind the Company
by any contract or engagement, to pledge its credit or to render it liable
pecuniarily for any purpose or amount.

          SECTION 2. Deposits. All funds of the Company not otherwise employed
                     --------
shall be deposited from time to time to the credit of the Company or otherwise
as the Board or Treasurer, or any other officer of the Company to whom power in
this respect shall have been given by the Board, shall select.

          SECTION 3. Proxies with Respect to Stock or Other Securities of Other
                     ----------------------------------------------------------
Corporations. The Board shall designate the officers of the Company who shall
- ------------
have authority from time to time to appoint an agent or agents of the Company to
exercise in the name and on behalf of the Company the powers and rights which
the Company may have as the holder of stock or other securities in any other
corporation, and to vote or consent with respect to such 

                                      -9-
<PAGE>
 
stock or securities. Such designated officers may instruct the person or persons
so appointed as to the manner of exercising such powers and rights, and such
designated officers may execute or cause to be executed in the name and on
behalf of the Company and under its corporate seal or otherwise, such written
proxies, powers of attorney or other instruments as they may deem necessary or
proper in order that the Company may exercise its powers and rights.

                                  ARTICLE VI

                  Shares and Their Transfer; Fixing Record Date
                  ---------------------------------------------

          SECTION 1. Certificates for Shares. Every owner of stock of the
                     -----------------------
Company shall be entitled to have a certificate certifying the number and class
of shares owned by him in the Company, which shall be in such form as shall be
prescribed by the Board. Certificates shall be numbered and issued in
consecutive order and shall be signed by, or in the name of, the Company by the
Chairman, the President or any Vice President, and by the Treasurer (or an
Assistant Treasurer, if appointed) or the Secretary (or an Assistant Secretary,
if appointed). In case any officer or officers who shall have signed any such
certificate or certificates shall cease to be such officer or officers of the
Company, whether because of death, resignation or otherwise, before such
certificate or certificates shall have been delivered by the Company, such
certificate or certificates may nevertheless be adopted by the Company and be
issued and delivered as though the person or persons who signed such certificate
had not ceased to be such officer or officers of the Company.

          SECTION 2. Record. A record in one or more counterparts shall be kept
                     ------
of the name of the person, firm or corporation owning the shares represented by
each certificate for stock of the Company issued, the number of shares
represented by each such certificate, the date thereof and, in the case of
cancellation, the date of cancellation. Except as otherwise expressly required
by law, the person in whose name shares of stock stand on the stock record of
the Company shall be deemed the owner thereof for all purposes regarding the
Company.

          SECTION 3. Transfer and Registration of Stock.
                     ----------------------------------

              (a)    The transfer of stock and certificates which represent the
stock of the Company shall be governed by Article 8 of Subtitle 1 of Title 6 of
the Delaware Code (the Uniform Commercial Code), as amended from time to time.

              (b)    Registration of transfers of shares of the Company shall be
made only on the books of the Company upon request of the registered holder
thereof, or of his attorney thereunto authorized by power of attorney duly
executed and filed with the Secretary of the Company, and upon the surrender of
the certificate or certificates for such shares properly endorsed or accompanied
by a stock power duly executed.

                                     -10-
<PAGE>
 
          SECTION 4. Addresses of Stockholders. Each stockholder shall designate
                     -------------------------
to the Secretary an address at which notices of meetings and all other corporate
notices may be served or mailed to him, and, if any stockholder shall fail to
designate such address, corporate notices may be served upon him by mail
directed to him at his post-office address, if any, as the same appears on the
share record books of the Company or at his last known post-office address.

          SECTION 5. Lost, Destroyed and Mutilated Certificates. The holder of
                     ------------------------------------------
any shares of the Company shall immediately notify the Company of any loss,
destruction or mutilation of the certificate therefor, and the Board may, in its
discretion, cause to be issued to him a new certificate or certificates for such
shares, upon the surrender of the mutilated certificates or, in the case of loss
or destruction of the certificate, upon satisfactory proof of such loss or
destruction, and the Board may, in its discretion, require the owner of the lost
or destroyed certificate or his legal representative to give the Company a bond
in such sum and with such surety or sureties as it may direct to indemnify the
Company against any claim that may be made against it on account of the alleged
loss or destruction of any such certificate.

          SECTION 6. Regulations. The Board may make such rules and regulations
                     -----------
as it may deem expedient, not inconsistent with these By-laws, concerning the
issue, transfer and registration of certificates for stock of the Company.

          SECTION 7. Fixing Date for Determination of Stockholders of Record.
                     -------------------------------------------------------

              (a)    In order that the Company may determine the stockholders
entitled to notice of or to vote at any meeting of stockholders or any
adjournment thereof, the Board may fix a record date, which record date shall
not precede the date upon which the resolution fixing the record date is adopted
by the Board, and which record date shall be not more than 60 nor less than 10
days before the date of such meeting. If no record date is fixed by the Board,
the record date for determining stockholders entitled to notice of or to vote at
a meeting of stockholders shall be at the close of business on the day next
preceding the day on which notice is given, or, if notice is waived, at the
close of business on the day next preceding the day on which the meeting is
held. A determination of stockholders of record entitled to notice of or to vote
at a meeting of stockholders shall apply to any adjournment of the meeting;
provided, however, that the Board may fix a new record date for the adjourned
- --------  -------
meeting.

              (b)    In order that the Company may determine the stockholders
entitled to consent to corporate action in writing without a meeting, the Board
may fix a record date, which record date shall not precede the date upon which
the resolution fixing the record date is adopted by the Board, and which date
shall be not more than 10 days after the date upon which the resolution fixing
the record date is adopted by the Board. If no record date has been fixed by the
Board, the record date for determining stockholders entitled to consent to
corporate action in writing without a meeting, when no prior action by the Board
is required by the Delaware Statute, shall be the first date on which a signed
written consent setting forth the action taken or 

                                     -11-
<PAGE>
 
proposed to be taken is delivered to the Company by delivery to its registered
office in this State, its principal place of business or an officer or agent of
the Company having custody of the book in which proceedings of meetings of
stockholders are recorded. Delivery made to the Company's registered office
shall be by hand or by certified or registered mail, return receipt requested.
If no record date has been fixed by the Board and prior action by the Board is
required by the Delaware Statute, the record date for determining stockholders
entitled to consent to corporate action in writing without a meeting shall be at
the close of business on the day on which the Board adopts the resolution taking
such prior action.

              (c)    In order that the Company may determine the stockholders
entitled to receive payment of any dividend or other distribution or allotment
of any rights or the stockholders entitled to exercise any rights in respect of
any change, conversion or exchange of stock, or for the purpose of any other
lawful action, the Board may fix a record date, which record date shall not
precede the date upon which the resolution fixing the record date is adopted,
and which record date shall be not more than 60 days prior to such action. If no
record date is fixed, the record date for determining stockholders for any such
purpose shall be at the close of business on the day on which the Board adopts
the resolution relating thereto.

                                  ARTICLE VII

                                     Seal
                                     ----

          The Board may provide a corporate seal, which shall be in the form of
a circle and shall bear the full name of the Company, the year of incorporation
of the Company and the words and figures "Corporate Seal - Delaware."

                                 ARTICLE VIII

                                  Fiscal Year
                                  -----------

          The fiscal year of the Company shall be the calendar year unless
otherwise determined by the Board.

                                  ARTICLE IX

                         Indemnification and Insurance
                         -----------------------------

          SECTION 1. Indemnification.
                     ---------------

              (a)    As provided in the Charter, to the fullest extent permitted
by the Delaware Statute as the same exists or may hereafter be amended, a
director of this Company shall not be liable to the Company or its stockholders
for breach of fiduciary duty as a director.

                                     -12-
<PAGE>
 
              (b)    Without limitation of any right conferred by paragraph (a)
of this Section 1, each person who was or is made a party or is threatened to be
made a party to or is otherwise involved in any threatened, pending or completed
action, suit or proceeding, whether civil, criminal, administrative or
investigative (hereinafter a "proceeding"), by reason of the fact that he or she
is or was a director, officer or employee of the Company or is or was serving at
the request of the Company as a director, officer or employee of another
corporation or of a partnership, joint venture, trust or other enterprise,
including service with respect to an employee benefit plan (hereinafter an
"indemnitee"), whether the basis of such proceeding is alleged action in an
official capacity while serving as a director, officer or employee or in any
other capacity while serving as a director, officer or employee, shall be
indemnified and held harmless by the Company to the fullest extent authorized by
the Delaware Statute, as the same exists or may hereafter be amended (but, in
the case of any such amendment, only to the extent that such amendment permits
the Company to provide broader indemnification rights than permitted prior
thereto), against all expense, liability and loss (including attorneys' fees,
judgments, fines, excise taxes or amounts paid in settlement) reasonably
incurred or suffered by such indemnitee in connection therewith and such
indemnification shall continue as to an indemnitee who has ceased to be a
director, officer or employee and shall inure to the benefit of the indemnitee's
heirs, testators, intestates, executors and administrators; provided, however,
                                                            --------  -------
that such person acted in good faith and in a manner he reasonably believed to
be in, or not opposed to, the best interests of the Company, and with respect to
a criminal action or proceeding, had no reasonable cause to believe his conduct
was unlawful; provided further, however, that no indemnification shall be made
              -------- -------  -------
in the case of an action, suit or proceeding by or in the right of the Company
in relation to matters as to which it shall be adjudged in such action, suit or
proceeding that such director, officer, employee or agent is liable to the
Company, unless a court having jurisdiction shall determine that, despite such
adjudication, such person is fairly and reasonably entitled to indemnification;
provided further, however, that, except as provided in Section 1(c) of this
- -------- -------  -------
Article IX with respect to proceedings to enforce rights to indemnification, the
Company shall indemnify any such indemnitee in connection with a proceeding (or
part thereof) initiated by such indemnitee only if such proceeding (or part
thereof) initiated by such indemnitee was authorized by the Board of Directors
of the Company. The right to indemnification conferred in this Article IX shall
be a contract right and shall include the right to be paid by the Company the
expenses incurred in defending any such proceeding in advance of its final
disposition (hereinafter an "advancement of expenses"); provided, however, that,
                                                        --------  -------
if the Delaware Statute requires, an advancement of expenses incurred by an
indemnitee in his or her capacity as a director or officer (and not in any other
capacity in which service was or is rendered by such indemnitee, including,
without limitation, service to an employee benefit plan) shall be made only upon
delivery to the Company of an undertaking (hereinafter an "undertaking"), by or
on behalf of such indemnitee, to repay all amounts so advanced if it shall
ultimately be determined by final judicial decision from which there is no
further right to appeal (hereinafter a "final adjudication") that such
indemnitee is not entitled to be indemnified for such expenses under this
Section or otherwise.

                                     -13-
<PAGE>
 
              (c)    If a claim under Section (b) of this Article IX is not paid
in full by the Company with 60 days after a written claim has been received by
the Company, except in the case of a claim for an advancement of expenses, in
which case the applicable period shall be 20 days, the indemnitee may at any
time thereafter bring suit against the Company to recover the unpaid amount of
the claim. If successful in whole or in part in any such suit, or in a suit
brought by the Company to recover an advancement of expenses pursuant to the
terms of any undertaking, the indemnitee shall be entitled to be paid also the
expense of prosecuting or defending such suit. In (i) any suit brought by the
indemnitee to enforce a right to indemnification hereunder (but not in a suit
brought by the indemnitee to enforce a right to an advancement of expenses) it
shall be a defense that, and (ii) in any suit by the Company to recover an
advancement of expenses pursuant to the terms of an undertaking the Company
shall be entitled to recover such expenses upon a final adjudication that, the
indemnitee has not met the applicable standard of conduct set forth in the
Delaware Statute. Neither the failure of the Company (including the Board,
independent legal counsel, or the stockholders) to have made a determination
prior to the commencement of such suit that indemnification of the indemnitee is
proper in the circumstances because the indemnitee has met the applicable
standard of conduct set forth in the Delaware Statute, nor an actual
determination by the Company (including the Board, independent legal counsel, or
the stockholders) that the indemnitee has not met such applicable standard of
conduct, shall create a presumption that the indemnitee has not met the
applicable standard of conduct or, in the case of such a suit brought by the
indemnitee, be a defense to such suit. In any suit brought by the indemnitee to
enforce a right to indemnification or to an advancement of expenses hereunder,
or by the Company to recover an advancement of expenses pursuant to the terms of
an undertaking, the burden of proving that the indemnitee is not entitled to be
indemnified, or to such advancement of expenses, under this Section or otherwise
shall be on the Company.

              (d)    The rights to indemnification and to the advancement of
expenses conferred in this Article IX shall not be exclusive of any other right
which any person may have or hereafter acquire under any statute, the Charter,
agreement, vote of stockholders or disinterested directors or otherwise.

          SECTION 2. Insurance. The Company may purchase and maintain insurance,
                     ---------
at its expense, to protect itself and any person who is or was a director,
officer, employee or agent of the Company or any person who is or was serving at
the request of the Company as a director, officer, employer or agent of another
corporation, partnership, joint venture, trust or other enterprise against any
expense, liability or loss, whether or not the Company would have the power to
indemnify such person against such expense, liability or loss under the Delaware
Statute.

                                     -14-
<PAGE>
 
                                   ARTICLE X

                                   Amendment
                                   ---------

          Any by-law (including these By-laws) may be adopted, amended or
repealed by the vote of the holders of a majority of the shares then entitled to
vote or by the stockholders' written consent pursuant to Section 10 of Article
II, or by the vote of the Board or by the directors' written consent pursuant to
Section 6 of Article III.

                                     -15-

<PAGE>
 
                                                                    Exhibit 10.4
 
                     MARKETING AND CO-PROMOTION AGREEMENT
                     ------------------------------------

          This Agreement (hereinafter "Agreement") effective the  1st day of
August, 1996, is between C.R. BARD, INC., a New Jersey corporation with offices
at 730 Central Avenue, Murray Hill, New Jersey 07974 (hereinafter "Bard"), and
CYTOGEN CORPORATION, a Delaware corporation with offices at 600 College Road
East, Princeton, New Jersey 08540 (hereinafter "Cytogen").

                                  BACKGROUND

          WHEREAS, Cytogen has developed and will continue to develop a line of
in vivo cancer imaging products, and
- -- ----                             

          WHEREAS, Bard has substantial experience in marketing medical
products, and

          WHEREAS, Cytogen is desirous of granting Bard the exclusive right to
market and promote "Product" in the "U.S." to "Urologists" and is further
desirous of granting Bard the co-exclusive right with Cytogen to market and
promote Product in the U.S. to "Managed Care Organizations", and

          WHEREAS, Cytogen, subject to exhaustion of rights of negotiation
granted to "CIS" with respect to promotion of Product to Urologists in the
Selected Countries (exclusive of Canada), is desirous of affording Bard a right
of first offer to obtain the 
<PAGE>
 
exclusive right to market and promote Product in one or more of the Selected
Countries (exclusive of Canada), and

          WHEREAS, Cytogen, subject to exhaustion of rights of negotiation
granted to "Faulding" with respect to promotion of Product to Urologists in
Canada, is desirous of affording Bard a right of first offer to obtain the
exclusive right to market and promote Product in Canada, and

          WHEREAS, Cytogen is desirous of granting Bard a right of first offer
to obtain the exclusive right to market and promote each "New Product" to
Urologists in the U.S. and is further desirous of granting Bard a right of first
offer to obtain the co-exclusive right with Cytogen to market and promote each
New Product to Managed Care Organizations in the U.S., and

          WHEREAS, Cytogen, subject to exhaustion of rights of negotiation
granted to CIS with respect to promotion of New Product to Urologists in the
Selected Countries (exclusive of Canada) is desirous of granting Bard a right of
first offer to obtain the exclusive right to market and promote each New Product
to Urologists in each of the Selected Countries (exclusive of Canada) in which
Bard or any of its Affiliate(s) promote and market Product, and

                                       2
<PAGE>
 
          WHEREAS, Cytogen, subject to exhaustion of rights of negotiation
granted to Faulding with respect to promotion of New Product to Urologists in
Canada, is desirous of granting Bard a right of first offer to obtain the
exclusive right to market and promote each New Product to Urologists in Canada
provided Bard or any of its Affiliate(s) promote and market Product in Canada,
and

          WHEREAS, Cytogen is desirous of retaining the exclusive right to
market and promote Product and each New Product to radiologists, nuclear
medicine physicians, nuclear medicine technologists and radiopharmacies and is
further desirous of retaining the exclusive right to sell Product and each New
Product to all customers.

          NOW THEREFORE, in consideration of the above premises and the mutual
agreements and undertakings set forth below, Cytogen and Bard hereby agree as
follows:

                           ARTICLE 1. - DEFINITIONS
                           ------------------------

     1.1. AFFILIATE shall mean any corporation, company, partnership, joint
          ---------                                                        
venture, person and/or firm which controls, is controlled by or is under common
control with a party.  For purposes of this Paragraph 1.1, control shall mean:
(i) in the case of corporate entities, direct or indirect ownership of at least
fifty percent (50%) of the stock or participating shares 

                                       3
<PAGE>
 
entitled to vote for the election of directors, and (ii) in the case of non-
corporate entities, direct or indirect ownership of at least fifty percent (50%)
of the equity interest or the power to direct the management and policies of
such entity.

     1.2  ANTIBODY - means the monoclonal antibody 7E11-C5.3 which is produced
          --------                                                            
by the hybridoma deposited with the American Type Culture Collection under ATCC
Designation HB 10494.

     1.3  BARD MARKETING PLAN - shall have the meaning ascribed in Paragraph
          -------------------                                               
5.3.

     1.4  BASELINE SALES - shall mean, for any given calendar year, the Net
          --------------                                                   
Sales achieved during the immediately preceding calendar year, provided,
however, that for the period commencing with the day after the first anniversary
of the Product Launch Date through and including the immediately following
December 31st, the definition set forth in Exhibit A, which is attached hereto
                                           ---------                          
and incorporated herein, shall apply.

     1.5  CIS - means CIS Biointernational, Inc., a corporation having its
          ---                                                             
principal place of business at B.P. 32-91192 Gef-Sur Yvette, Cedex, France.

     1.6  COMMISSIONS - shall have the meaning ascribed in Paragraph 6.2 and
          -----------                                                       
Exhibit A.
- --------- 

                                       4
<PAGE>
 
     1.7  COMMISSION RATE - shall have the meanings ascribed in Exhibit A.
          ---------------                                       --------- 

     1.8  COMPETITIVE PRODUCT - means an in vivo nuclear imaging system which:
          -------------------                                                 
(i) utilizes a targeting agent to which a radioisotope is bonded during use, and
(ii) is sold for detecting prostate cancer outside of the prostate gland, and
(iii) directly competes with Product or a New Product which Bard is obligated to
market and promote hereunder.

     1.9  CYTOGEN MARKETING PLAN - shall have the meaning ascribed in Paragraph
          ----------------------                                               
5.3.

     1.10 DISCLOSING PARTY - shall have the meaning ascribed in Paragraph 8.1.
          ----------------                                                    

     1.11 EFFECTIVE DATE - shall mean the date of this Agreement first written
          --------------                                                      
above.

     1.12 FAULDING - means Faulding (Canada), Inc., a corporation having a place
          --------                                                              
of business at 334 Aime-Vincent, Vaudrevil, Quebec, Canada J72525.

     1.13 FDA - shall mean the United States Food and Drug Administration.
          ---                                                             

                                       5
<PAGE>
 
     1.14 FD&C ACT - shall mean the Food Drug & Cosmetic Act as set forth in
          --------                                                          
Title 21, United States Code, as amended, and the regulations promulgated
thereunder.

     1.15 IMAGING PHYSICIANS - shall mean radiologists, nuclear medicine
          ------------------                                            
physicians, radiology/nuclear medicine technologists and radiopharmacists.

     1.16 INCREMENTAL SALES - shall mean, for any given year, that portion of
          -----------------                                                  
Net Sales, if any, which exceeds Baseline Sales.

     1.17 INDEMNITEE - shall have the meaning ascribed in Paragraph 9.4.
          ----------                                                    

     1.18 INDEMNITOR - shall have the meaning ascribed in Paragraph 9.4
          ----------                                                   

     1.19 JOINT MARKETING COMMITTEE - shall mean the Joint Marketing Committee
          -------------------------                                           
established pursuant to Section 5.1 hereof.

     1.20 MANAGED CARE ORGANIZATIONS - shall mean health maintenance
          --------------------------                                
organizations, networks of healthcare providers or other similar entities that
provide, or otherwise make available, a program of health care services to a
member/subscriber for a fixed fee.

                                       6
<PAGE>
 
     1.21 NET SALES - shall mean [INFORMATION OMITTED AND FILED SEPARATELY WITH
          ---------                                                            
THE COMMISSION UNDER RULE 24B-2.]



     1.22 NEW PRODUCT - shall mean and include each in vivo prostate cancer
          -----------                                                      
imaging product which does not utilize the Antibody and which, during the Term,
Cytogen or any Affiliate of Cytogen would have the right to sell in any part of
the Territory.

                                       7
<PAGE>
 
     1.23 PARTIAL YEAR PERIOD - shall mean the period commencing on the day
          -------------------                                              
following the first anniversary of the Product Launch Date through and including
the immediately following December 31st.

     1.24 PIE SITES - mean those hospital-based nuclear medicine physicians or
          ---------                                                           
radiologists or department of nuclear medicine physicians or radiologists who:
(i) prior to the Effective Date, have been accepted into Cytogen's Partners In
Excellence Program and have received training and testing in the use of Product
in accordance with Cytogen's quality assurance protocols, or (ii) during the
Term, the Joint Marketing Committee determines meet the criteria set forth on
Exhibit B, which is attached hereto and incorporated herein, (as may be modified
- ---------                                                                       
from time to time by the Joint Marketing Committee), and who are accepted into
Cytogen's Partners In Excellence Program and undergo training and testing in the
use of Product in accordance with Cytogen's quality assurance protocols.

     1.25 PLA - means a product license application as described in 21 CFR Part
          ---                                                                  
601.

     1.26 PRODUCT - shall mean and include each in vivo prostate cancer imaging
          -------                                                              
product which utilizes the Antibody and which, during the Term, Cytogen or any
Affiliate of Cytogen has or would have the right to sell in any part of the
Territory.

                                       8
<PAGE>
 
     1.27 PRODUCT LAUNCH DATE - shall mean the date of first commercial sale of
          -------------------                                                  
Product in the Territory by Cytogen or any Affiliate of Cytogen to a non-
Affiliate of Cytogen following the receipt by Cytogen of all necessary FDA
approvals to market and promote such Product in the Territory, including,
without limitation, any necessary pre-approval of advertising or promotional
materials.

     1.28 REACTION NOTICE - shall have the meaning ascribed in Paragraph 7.1.
          ---------------                                                    

     1.29 RECEIVING PARTY - shall have the meaning ascribed in Paragraph 8.1.
          ---------------                                                    

     1.30 SELECTED COUNTRIES - mean Australia, Canada, France, Germany, Austria,
          ------------------                                                    
Switzerland, Italy, Japan, Sweden, Norway, Finland, Denmark, Spain and the
United Kingdom.

     1.31 SPECIFICATIONS - mean the finished product specifications and related
          --------------                                                       
quality control testing protocols relating to Product, as constituted on the
Effective Date, as set forth in the PLA referred to in Paragraph 2.1(e), as may
be amended or supplemented by Cytogen during the Term.

     1.32 TERM - shall mean the period commencing on the Effective Date and,
          ----                                                              
unless terminated earlier pursuant to 

                                       9
<PAGE>
 
Paragraph 3.3, Paragraph 11.1 or Article X, ending on the later of: (i) the
tenth anniversary of the Product Launch Date, or (ii) the last date of any
applicable additional term described to Paragraph 10.1 hereof.

     1.33 TERRITORY - shall mean the U.S. and those Selected Countries added to
          ---------                                                            
the Territory by mutual written agreement of the parties pursuant to Paragraph
4.4.

     1.34 UNACCEPTED 3.2 OFFER - shall have the meaning ascribed in Paragraph
          --------------------                                               
3.2.

     1.35 UNACCEPTED 4.4 OFFER - shall have the meaning ascribed in Paragraph
          --------------------                                               
4.4.

     1.36 UROLOGISTS - shall mean: (i) physicians who are board certified for
          ----------                                                         
the practice of urology, and (ii) primary care physicians who treat urological
conditions.

     1.37 U.S. - means the United States of America exclusive of its territories
          ----                                                                  
and possessions.

     1.38 WAIVER NOTICE - shall have the meaning ascribed in Paragraph 4.4.
          -------------                                                    

                                       10
<PAGE>
 
     1.39 3.2 BARD NOTICE - shall have the meaning ascribed in Paragraph 3.2.
          ---------------                                                    

     1.40 3.2 CYTOGEN NOTICE - shall have the meaning ascribed in Paragraph 3.2.
          ------------------                                                    

     1.41 4.4 BARD NOTICE - shall have the meaning ascribed in Paragraph 4.4.
          ---------------                                                    

     1.42 4.4 CYTOGEN NOTICE - shall have the meaning ascribed in Paragraph 4.4.
          ------------------                                                    

          ARTICLE 2. - REPRESENTATIONS AND WARRANTIES
          -------------------------------------------

     2.1. REPRESENTATIONS & WARRANTIES OF CYTOGEN - Cytogen hereby represents
          ---------------------------------------                            
and warrants to bard that:

     (a)  Cytogen is a corporation organized, validly existing and in good
          standing under the laws of the State of Delaware, has all requisite
          corporate power and authority to own and operate its property and to
          carry on its business as now being conducted, and is duly qualified
          and in good standing to do business in any of those jurisdictions
          where it is required to be qualified as a result of ownership of
          property or residence of any of its employees or agents, except for
          those jurisdictions in which failure to so qualify 

                                       11
<PAGE>
 
          would not have a material adverse effect on the business or assets of
          Cytogen, and

     (b)  the execution and delivery of this Agreement has been duly and validly
          authorized by all necessary corporate action on the part of Cytogen
          and (assuming valid execution of this Agreement by Bard) this
          Agreement is and shall be, during the Term, a valid and binding
          obligation of Cytogen enforceable against it in accordance with its
          terms, except to the extent that such enforcement may be subject to
          bankruptcy, insolvency, reorganization, moratorium or other similar
          laws now or hereafter in effect relating to creditors' rights or the
          discretion of a court of competent jurisdiction as to specific
          performance, and

     (c)  neither Cytogen nor any Affiliate of Cytogen is currently a party to
          any agreement or understanding, oral or written, which is
          inconsistent, in any material respect, with the rights granted to Bard
          hereunder or the obligations imposed on Cytogen hereunder and, during
          the Term, Cytogen and its Affiliates shall refrain from entering into
          any agreement or understanding, oral or written, which would be
          inconsistent, in any material respect, with the rights 

                                       12
<PAGE>
 
          granted to Bard hereunder or the obligations imposed on Cytogen
          hereunder, and

     (d)  prior to the Effective Date, Phase III clinical trials of the Product
          which is the subject of the PLA referred to in Paragraph 2.1(e) were
          completed, and

     (e)  a PLA on a Product, in form as constituted on the Effective Date, is
          currently pending with FDA which, on July 22, 1996, received unanimous
          recommendation for approval by the Medical Imaging Drug Advisory
          Committee to FDA, and

     (f)  on the Effective Date, Cytogen owns or leases a manufacturing facility
          having production capability sufficient to manufacture 400,000 units
          of Product per year.

     (g)  Exhibit C, which is attached hereto and incorporated herein, sets
          ---------                                                        
          forth a true, accurate and complete list of the name and address of
          each PIE Site existing on the Effective Date, and

     (h)  prior to the Effective Date, Cytogen did not grant to any third party
          any marketing, promotional or distribution rights on any in vivo
          prostate cancer 

                                       13
<PAGE>
 
          imaging product, except for the right of first negotiation to market
          and promote Product and New Product in the Selected Countries
          (exclusive of Canada) previously granted to CIS and the right of first
          negotiation to market and promote Product and New Product in Canada
          previously granted to Faulding.

     2.2  REPRESENTATIONS & WARRANTIES OF BARD - Bard hereby represents and
          ------------------------------------                             
warrants to Cytogen that:

     (a)  Bard is a corporation organized, validly existing and in good standing
          under the laws of the State of New Jersey, has all requisite corporate
          power and authority to own and operate its property and to carry on
          its business as now being conducted and is duly qualified and in good
          standing to do business in any of those jurisdictions where it is
          required to be qualified as a result of ownership of property or
          residence of any of its employees or agents, except for those
          jurisdiction in which failure to so qualify would not have a material
          adverse effect on the business or assets of Bard, and

     (b)  the execution and delivery of this Agreement has been duly and validly
          authorized by all necessary corporate action on the part of Bard and
          (assuming valid 

                                       14
<PAGE>
 
          execution of this Agreement by Cytogen) this Agreement is and shall
          be, during the Term, a valid and binding obligation of Bard
          enforceable against it in accordance with its terms, except to the
          extent that such enforcement may be subject to bankruptcy, insolvency,
          reorganization, moratorium or other similar laws now or hereafter in
          effect relating to creditors' rights or the discretion of a court of
          competent jurisdiction as to specific performance, and

     (c)  neither Bard nor any Affiliate of Bard is currently a party to any
          agreement or understanding, oral or written, which would prohibit or
          which would limit, in any material manner, the performance of any
          obligation undertaken hereunder to be performed by Bard directly or
          indirectly through and of its Affiliates, and

     (d)  neither Bard nor any Affiliate of Bard will market or promote Product
          outside of the Territory.

                 ARTICLE 3. - MARKETING AND PROMOTION BY BARD

     3.1  GRANT OF PRODUCT MARKETING AND PROMOTION RIGHTS. Cytogen hereby grants
          -----------------------------------------------                       
to Bard the exclusive right to market each  Product in the Territory to
Urologists and the co-exclusive right with Cytogen to market each Product in the
U.S. to Managed Care 

                                       15
<PAGE>
 
Organizations. Subject to the provisions of Paragraph 4.4, Cytogen reserves all
other rights to market, promote and sell each Product.  Cytogen covenants to
notify Bard of the existence of each Product which is different, in any material
respect, from the Product which is the subject of the PLA referred to in
Paragraph 2.1(e) within thirty (30) days of the date on which the clinical
efficacy thereof has been established and further covenants to include in its
notice a technical summary of the clinical advantages of such Product vis a vis
the Product which is the subject of the PLA referred to in Paragraph 2.1(e).
Further, Cytogen covenants to disclose to Bard, within fourteen (14) business
days of receipt of request from Bard, such other technical information relating
to each Product which is the subject of a notice issued by Cytogen pursuant to
this Paragraph 3.1 as Bard reasonably requests.

     3.2. RIGHT OF FIRST OFFER - Cytogen hereby grants to Bard a right of first
          --------------------                                                 
offer to obtain: (i) the exclusive right to market and promote each New Product
to Urologists in the U.S., and (ii) the co-exclusive right with Cytogen to
market and promote each New Product to Managed Care Organizations in the U.S.,
and (iii) the exclusive right to market and promote each New Product to
Urologists in each of the Selected Countries (exclusive of Canada) in which Bard
or any of its Affiliate(s) promote and market Product, subject to exhaustion of
rights of negotiation granted to CIS with respect to promotion of New Product to
Urologists in the Selected Countries (exclusive of Canada), on a country by
country basis, and (iv) the exclusive right to market and promote each New
Product to 

                                       16
<PAGE>
 
Urologists in Canada provided Bard or any of its Affiliate(s) promote and market
Product in Canada, subject to exhaustion of rights of negotiation granted to
Faulding with respect to promotion of New Product to Urologists in Canada.
Cytogen hereby covenants to notify Bard of the existence of each New Product
within thirty (30) days of the availability of a final report on the Phase III
clinical trials relating thereto and further covenants to include in each such
notice all technical information and data in its possession relative to the New
Product which is the subject of such notice, as well as the terms upon which
Cytogen would be willing to grant Bard such marketing and promotional rights
thereon, by country (a "3.2 Cytogen Notice").  Within sixty (60) days of receipt
by Bard of a particular 3.2 Cytogen Notice, Bard shall notify Cytogen of its
intent to negotiate with Cytogen with respect to the right to market and promote
the New Product which was the subject of such 3.2 Cytogen Notice in the U.S.
and/or in one (1) or more of the Selected Countries (a "3.2 Bard Notice").  In
the event Bard fails to respond to a particular 3.2 Cytogen Notice within sixty
(60) days of receipt thereof, Bard's right of first offer on the New Product
which was the subject of such 3.2 Cytogen Notice shall immediately be
extinguished.  In the event a particular 3.2 Bard Notice indicates that Bard has
no interest in negotiating with Cytogen with respect to the New Product which
was the 

                                       17
<PAGE>
 
subject of the corresponding 3.2 Cytogen Notice, Bard's right of first offer on
such New Product shall immediately be extinguished.  In the event a particular
3.2 Bard Notice indicates that Bard is interested in negotiating with Cytogen on
some but not all of the rights which are the subject to its right of first offer
relating to the New Product which was the subject of the corresponding 3.2
Cytogen Notice, Bard's right of first offer on such New Product shall
immediately be extinguished only to the extent such 3.2 Bard Notice indicates a
lack of interest in such rights.  In the event a particular 3.2 Bard Notice
indicates that Bard is interested in negotiating with Cytogen with respect to
the grant to Bard of marketing and promotional rights on the New Product which
was the subject of the corresponding 3.2 Cytogen Notice, the parties shall meet
within ten (10) business days of Cytogen's receipt of such 3.2 Bard Notice and
shall negotiate, in good faith, the grant of rights thereon to the extent
specified therein.  In the last mentioned event, if the parties fail to reach
written agreement, within ninety (90) days of Cytogen's receipt of a particular
3.2 Bard Notice, on the grant of rights specified therein, Bard shall reduce its
last offer thereon ( an "Unaccepted 3.2 Offer") to writing, shall furnish the
same to Cytogen and Cytogen shall thereafter have the right to itself market and
promote the New Product which was the subject of the Unaccepted 3.2 Offer to the
extent specified therein and shall have the right to grant any third party the
right to market and promote such New Product on 

                                       18
<PAGE>
 
terms no more favorable than those specified in the Unaccepted 3.2 Offer.
Cytogen covenants, from the time of issuance of a particular 3.2 Cytogen Notice
through the expiration of the ninety (90) day negotiation period thereon, to
refrain from marketing or promoting (or negotiating with any third party on
marketing or promoting) the New Product which was the subject of such 3.2
Cytogen Notice in a manner which is inconsistent with Bard's right of first
offer thereon.  The restrictions in the immediately preceding sentence shall
cease in the event the negotiations between Cytogen and Bard are terminated. In
the event Cytogen, on one or more occasions, intends to offer a third party
rights on terms more favorable than those in an Unaccepted 3.2 Offer, Cytogen
shall so notify Bard setting forth such terms.  Any notice issued by Cytogen
pursuant to the immediately preceding sentence shall be deemed a counter offer
which may be accepted by Bard within forty five (45) days of Bard's receipt
thereof.

     3.3  MARKETING AND PROMOTION.  Subject to the granting of required
          -----------------------                                      
regulatory approvals and registrations to sell Product, during the Term, Bard
shall use commercially reasonable efforts to market and promote Product to
Urologists and Managed Care Organizations in the U.S. and, subject to expansion
of the Territory pursuant to Paragraph 4.4, shall use commercially reasonable
efforts to market and promote Product to Urologists in the Territory outside the
U.S. in a manner intended to maximize

                                       19
<PAGE>
 
sales and market penetration of Product at the earliest date and consistent with
the Bard Marketing Plan presented annually to the Joint Marketing Committee by
Bard pursuant to Paragraph 5.3 hereof. Promotion by Bard during the first three
(3) years following the Product Launch Date shall: (i) average at least [*]
Product presentations to Urologists per year, and (ii) include a minimum of [*]
Product presentations to Urologists per year. The parties hereby expressly
acknowledge and agree that the aforementioned presentations may be made by Bard
on Product alone or may be made in conjunction with the presentation of one or
more products of Bard and/or its Affiliates, provided however, if any such
presentation of Product is made in conjunction with one or more products of Bard
and/or its Affiliates, Bard shall assure that a fair presentation of Product is
given. In addition to Bard's expenditures for such direct marketing and
promotional presentations, Bard's marketing and promotional efforts shall
further include additional promotional expenditures (the amount of which shall
be determined by Bard in its sole judgment) for promotional brochures,
conventions and exhibits, and educational programs consistent with the Bard
Marketing Plan approved by the Joint Marketing Committee. Additionally, Bard
shall include Product in any applicable prostate disease management program
sponsored by Bard. Further, Bard hereby covenants to Cytogen that, during the
remainder of the Term following the Product Launch Date, Bard shall maintain a
sales force of not less than forty four (44) competent persons

* [INFORMATION OMITTED AND FILED SEPARATELY WITH THE COMMISSION UNDER RULE 24B-
2.]

                                       20
<PAGE>
 
dedicated to promoting medical products to Urologists in the U.S. on a full time
basis.  In the event Bard breaches the covenant set forth in the immediately
preceding sentence and fails to cure such breach written ninety (90) days of
receipt of written demand from Cytogen, Cytogen, as its sole and exclusive
remedy, shall have the right to immediately terminate this Agreement upon notice
to Bard.

     3.4  SUPPORT SERVICES - Bard, at its expense, shall develop and produce, or
          ----------------                                                      
cause to be developed and produced, all marketing, promotional and advertising
materials to be used in the performance of the duties described in Paragraph
3.3.  Bard agrees to provide Cytogen, for its review and written approval prior
to use, with all proposed marketing, promotional and advertising materials for
Product to enable Cytogen to assure itself that such materials comply with
labeling approved by FDA and all other requirements of competent governmental
authorities in the Territory.  Further, Bard agrees to provide Cytogen with the
requisite number of production samples of all materials referred to in this
Paragraph 3.4 for submission by Cytogen to FDA.  Additionally, Bard, with
technical support from Cytogen as necessary, agrees to provide Urologists
located in the Territory and Managed Care Organizations located in the U.S. with
support on the clinical utility of Product.

                                       21
<PAGE>
 
     3.5  MARKETING AND PROMOTION BY BARD - Bard hereby covenants that Bard (and
          -------------------------------                                       
to the extent applicable Affiliates of Bard) shall market and promote Product
only: (i) for a use(s), indication(s) or application(s) which is contained in
labeling supplied by Cytogen or is contained in marketing, promotional or
advertising materials which have been approved in writing by Cytogen in advance
of use, and (ii) in a manner which is consistent, in every material respect,
with Bard's customary marketing and promotional guidelines, and (iii) in
compliance with all applicable laws and regulations governing the conduct of
employees engaged in the promotion and marketing of in vivo diagnostic products,
except where non-compliance with any such law or regulation results from
promotion of Product for a use(s), indication(s) or application(s) which is
contained in: (a) labeling supplied by Cytogen, or (b) marketing, promotional or
advertising materials which have been approved in writing by Cytogen in advance
of use.

                         ARTICLE 4 - CYTOGEN'S DUTIES

     4.1  REGULATORY APPROVALS.  Cytogen shall bear the costs, have the
          --------------------                                         
responsibility for, and use diligent efforts to, obtain and maintain all
regulatory approvals and registrations from governmental authorities necessary
in order to lawfully manufacture, market, promote and sell Product in the
Territory.

                                       22
<PAGE>
 
     4.2  MANUFACTURING, MARKETING AND PROMOTION.  Subject to obtaining required
          --------------------------------------                                
regulatory approvals and registrations, during the Term, Cytogen shall have the
obligation to use commercially reasonable efforts to: (i) manufacture sufficient
quantities of Product to timely fill all customer orders in the Territory, and
(ii)  market and promote Product in the Territory to Imaging Physicians and in
the U.S. to Managed Care Organizations, and (iii) sell Product to customers in
the Territory, provided, however, that marketing and promotional activities by
Cytogen which are directed to Managed Care Organizations shall be coordinated
with the Joint Marketing Committee and be consistent with both the Bard
Marketing Plan and the Cytogen Marketing Plan.  Cytogen agrees to cause at least
[*] PIE Sites to be operational by the Product Launch Date.  Additionally,
Cytogen agrees to cause at least [*] PIE Sites to be operational not later than
the first anniversary of the Product Launch Date and to cause at least [*] PIE
Sites to be operational not later than the second anniversary of the Product
Launch Date.  In the event that Cytogen achieves at least eighty percent (80%)
of any applicable milestone set forth in the immediately preceding sentence as
of the prescribed date, then Cytogen shall have an additional six (6) months to
fully achieve such milestone.  Cytogen agrees that the abovereferenced PIE Sites
which are to become operational after the Product Launch Date shall be at
locations reasonably acceptable to Bard.  Further, Cytogen shall cause
additional PIE Sites to become operational at times and at locations identified

* [INFORMATION OMITTED AND FILED SEPARATELY WITH THE COMMISSION UNDER RULE 24B-
2.]

                                       23
<PAGE>
 
by the Joint Marketing Committee and in the Cytogen Marketing Plan with the
intention of including such additional PIE Sites as marketing targets for
Product.

     4.3  SUPPORT SERVICES.  Cytogen shall, at its own expense, be responsible
          ----------------                                                    
for the manufacturing, storage, distribution and sale of Product, including,
without limitation, the entry of sales orders, invoicing and collection of sales
revenues.  To the extent necessary to fulfill its obligations under Paragraphs
3.4 and 4.2, Cytogen shall: (i) develop and produce all marketing and
promotional materials for Product, and (ii) provide all customer and technical
support relating to Product.

     4.4  EXPANSION OF THE TERRITORY - The parties hereby acknowledge and agree
          --------------------------                                           
that, as of the Effective Date, the Territory shall be limited to the U.S.
Cytogen hereby grants to Bard a right of first offer to expand the Territory to
include one (1) or more of the Selected Countries, subject to relinquishment by
CIS and Faulding of their respective rights of first negotiation to market and
promote Product to Urologists in the Selected Countries.  In the event CIS
notifies Cytogen that it relinquishes its said right of first negotiation with
respect to one or more of the Selected Countries (other than Canada) or in the
event Faulding notifies Cytogen that it relinquishes its said right of first
negotiation with respect to Canada (a "Waiver Notice"), Cytogen, within thirty
(30) business days of its 

                                       24
<PAGE>
 
receipt of the Waiver Notice, shall so notify Bard and shall include in its
notice the country or countries which were the subject of the Waiver Notice, as
well as the terms and conditions upon which Cytogen would be willing to expand
the Territory to include the country or countries which were the subject of the
Waiver Notice (a "4.4 Cytogen Notice"). Within sixty (60) days of receipt by
Bard of a particular 4.4 Cytogen Notice, Bard shall issue a notice to Cytogen (a
"4.4 Bard Notice") of its intent to negotiate with Cytogen on expansion of the
Territory to include one (1) or more of the countries specified in such 4.4
Cytogen Notice. In the event Bard fails to respond to a particular 4.4 Cytogen
Notice within sixty (60) days of receipt thereof, Bard's right of first offer to
expand the Territory to include the country or countries specified in such 4.4
Cytogen Notice shall immediately be extinguished. In the event a particular 4.4
Bard Notice indicates that Bard has no interest in negotiating with Cytogen to
expand the Territory to include any of the countries specified in the
corresponding 4.4 Cytogen Notice, Bard's right of first offer to expand the
Territory to include such countries shall immediately be extinguished. In the
event a particular 4.4 Bard Notice indicates that Bard is interested in
negotiating with Cytogen to expand the Territory to include some but not all of
the countries specified in the corresponding 4.4 Cytogen Notice, Bard's right of
first offer to expand the Territory shall be extinguished only to the extent
such 4.4 Bard Notice indicates a lack of interest in negotiating with respect to
a specific

                                       25
<PAGE>
 
country or countries. In the event a particular 4.4 Bard Notice indicates that
Bard is interested in negotiating with Cytogen to expand the Territory, the
parties shall meet within thirty (30) business days of Cytogen's receipt of such
4.4 Bard Notice and shall negotiate, in good faith, the expansion of the
Territory to the extent specified in the 4.4 Bard Notice. In the last mentioned
event, if the parties fail to reach written agreement, within ninety (90) days
of Cytogen's receipt of a particular 4.4 Bard Notice, on the expansion of the
Territory to include the country or countries specified therein, Bard shall
reduce its last offer thereon (an "Unaccepted 4.4 Offer") to writing, shall
furnish the same to Cytogen and Cytogen shall thereafter have the right to
itself market and promote Product to Urologists in the country or countries
which were the subject of the Unaccepted 4.4 Offer and shall have the right to
grant any third party the right to market and promote Product to Urologists in
the country or countries which were the subject of the Unaccepted 4.4 Offer on
terms no more favorable than those specified therein. Cytogen covenants, from
the time of issuance of a particular 4.4 Cytogen Notice through the expiration
of the ninety (90) day negotiation period thereon, to refrain from marketing or
promoting (or negotiating with any third party on marketing or promoting)
Product to Urologists in the country or countries which were the subject of such
4.4 Cytogen Notice, except to the extent Bard's right of first offer to expand
the Territory has been extinguished. The restrictions in the immediately
preceding

                                       26
<PAGE>
 
sentence shall cease in the event negotiations between Cytogen and
Bard are terminated.  In the event Cytogen, on one or more occasions, intends to
offer a third party rights on terms more favorable than those in an Unaccepted
4.4 Offer, Cytogen shall so notify Bard setting forth such terms.  Any notice
issued by Cytogen pursuant to the immediately preceding sentence shall be deemed
a counter offer which may be accepted by Bard within forty five (45) days of
Bard's receipt thereof.

     4.5  CHANGE IN SPECIFICATIONS - During the Term, Cytogen shall not change
          ------------------------                                            
or supplement any of the Specifications where any such change or supplement
requires a PLA or PLA supplement without first consulting with Bard.

     4.6  MARKETING AND PROMOTION BY CYTOGEN - Cytogen hereby covenants that
          ----------------------------------                                
Cytogen (and to the extent applicable Affiliates of Cytogen) shall market,
promote and sell Product only: (i) for a use(s), indication(s) or application(s)
which is approved by competent governmental authority in the country in which
Product is marketed, promoted or sold, and (ii) in compliance with all
applicable laws and regulations governing the conduct of employees engaged in
the promotion and marketing of in vivo diagnostic products.

                                       27
<PAGE>
 
                     ARTICLE 5 - JOINT MARKETING COMMITTEE

     5.1  FORMATION.  Within thirty (30) days after the Effective Date, the
          ---------                                                        
parties shall establish a Joint Marketing Committee having a total membership of
four (4), of which two shall be designated by each party to this Agreement.  A
Chairman shall be selected by Cytogen to preside over its meetings and to
establish the Joint Marketing Committee's agenda.  The Joint Marketing Committee
shall meet on frequent basis, at least quarterly, during the Term at a time and
place to be mutually agreed upon in advance by the members of the Joint
Marketing Committee.

     5.2  PURPOSE.  The purpose of the Joint Marketing Committee is to co-
          -------                                                        
ordinate and monitor the marketing and promotional efforts of Bard and the
marketing, promotional and sales efforts of Cytogen with respect to Product and
to assist in: (i) the development of consistent marketing strategies and
promotional materials for Product, and (ii) effective implementation of such
strategies, and (iii) the sharing of relevant market statistics and information
about Product and each party's performance under this Agreement.

     5.3  REPORTING.  At least sixty (60) days before the Product Launch Date,
          ---------                                                           
and at least sixty (60) days before each anniversary of the Product Launch Date
thereafter, each party shall deliver to the Joint Marketing Committee for its
approval an annual 

                                       28
<PAGE>
 
marketing plan for Product (referred to as the "Cytogen Marketing Plan", or the
"Bard Marketing Plan", as the case may be) which shall include a three (3) year
forecast of sales by units of Product, marketing goals and tactics, and the
anticipated marketing and sales resources to be allocated to the implementation
of the marketing plan. Within fifteen (15) days after the last day of each
calendar quarter following the Product Launch Date, Cytogen shall deliver a
written report to the Joint Marketing Committee setting forth: (i) the gross
sales of Product by Cytogen or any Affiliate of Cytogen during such quarter,
broken down by country within the Territory, and information detailing
deductions in arriving at Net Sales, and (ii) actual expenditures, during such
quarter, by Cytogen and any Affiliate of Cytogen for marketing, promotional and
sales efforts relative to Product, and (iii) such additional information as the
Joint Marketing Committee may reasonably request. Within fifteen (15) days after
the last day of each calendar quarter following the Product Launch Date, Bard
shall deliver a written report to the Joint Marketing Committee setting forth:
(i) actual expenditures, during such quarter, by Bard and any Affiliate of Bard,
for marketing and promotional efforts relating to Product, and (ii) the number
of Product presentations made by Bard to Urologists and Managed Care
Organizations during such quarter, and (iii) such additional information as the
Joint Marketing Committee may reasonably request. A copy of each such report
shall be sent to the President of Cytogen and the Vice President and General

                                       29
<PAGE>
 
Manager of Bard's Urological Division within fifteen (15) days of the end of the
calendar quarter to which it relates.

     5.4  DISPUTE RESOLUTION.  In the event that the Joint Marketing Committee
          ------------------                                                  
is unable to reach a unanimous agreement by its members on any matter within its
purview, such dispute shall be the subject of discussion and negotiation between
the President of Cytogen and the Vice President and General Manager of Bard
Urological Division.  Neither party shall pursue any of its remedies under this
Agreement, whether at law or otherwise, with respect to such dispute until at
least thirty (30) days have elapsed since the date upon which written notice of
a dispute has been delivered to the designee of each party hereto.

                             ARTICLE 6 - PAYMENTS

     6.1  CO-PROMOTIONAL RIGHTS PAYMENT  In consideration of the grant by
          -----------------------------                                  
Cytogen to Bard of the exclusive right to market and promote Product to
Urologists in the U.S. and the grant by Cytogen to Bard of the co-exclusive
right to market and promote Product to Managed Care Organization in the United
States, Bard shall pay to Cytogen [INFORMATION OMITTED AND FILED SEPARATELY WITH
THE COMMISSION UNDER RULE 24B-2.] within fifteen (15) days after notice by
Cytogen to Bard of FDA approval to market and sell Product in the U.S.
Additionally, in the event the Territory is expanded to include Japan, Bard
shall pay Cytogen [INFORMATION OMITTED AND FILED SEPARATELY WITH THE COMMISSION
UNDER RULE 24B-2.] on the

                                       30
<PAGE>
 
date on which the Territory is so expanded.  Further, in the event the Territory
is expanded to include four (4) of the Selected Countries (other than Japan),
Bard shall pay Cytogen [INFORMATION OMITTED AND FILED SEPARATELY WITH THE
COMMISSION UNDER RULE 24B-2.] on the date on which the Territory is so expanded.

     6.2  COMMISSIONS.  In consideration of the undertakings of Bard hereunder,
          -----------                                                          
Cytogen agrees to pay Commissions to Bard in accordance with the provisions of
                                                                              
Exhibit A.
- --------- 

     6.3  PAYMENT OF COMMISSIONS.  Bard's right to receive a Commissions under
          ----------------------                                              
Paragraph 6.2 shall commence upon the first commercial sale of Product in the
Territory by Cytogen or any Affiliate of Cytogen to a non-Affiliate of Cytogen.
Cytogen shall invoice and shall cause its Affiliates to invoice customers for
Product within two (2) business days of shipment. For purposes of this
Agreement, each Product shall be deemed sold at the time of invoice. Cytogen
shall pay Bard Commissions on a quarterly basis during the Term within forty-
five (45) days after the end of each calendar quarter. All Commission payments
due hereunder shall be paid in the currency of the country in which the
applicable sales of Product are made.

     6.4  QUARTERLY REPORTS.  Within forty-five (45) days after the end of each
          -----------------                                                    
calendar quarter, Cytogen shall provide Bard with an accurate written report
with respect to such quarter

                                       31
<PAGE>
 
detailing: (i) the gross sales of Product by Cytogen or any Affiliate of Cytogen
during such quarter, by country, PIE Site, hospital or other health care
facility, and (ii) information detailing deductions from the gross sales in
arriving at Net Sales, and (iii) the calculation of Commissions payable for such
quarter. No reports shall be required under this Paragraph prior to the date of
first commercial sale of Product in the Territory.

     6.5  RECORDS AND AUDIT RIGHTS.  Cytogen shall maintain all reports referred
          ------------------------                                              
to in Paragraph 6.4, together with supporting business records, for a period of
five (5) years.  Additionally, Cytogen shall generate and maintain, for a period
of five (5) years post sale, accurate records of Net Sales, Baseline Sales and
Incremental Sales.  At the request and expense of Bard, an independent auditor,
selected by Bard and acceptable to Cytogen, shall have access limited to once
per calendar year, at Cytogen's principal place of business during ordinary
business hours with reasonable notice, to records referred to in this Paragraph
6.5. If deemed necessary or desirable, in the sole opinion of the independent
auditor, the independent auditor shall, at Bard's expense, be permitted to
consult with and obtain the assistance of consultants selected by the
independent auditor and acceptable to Cytogen.  Such acceptance shall not be
unreasonably withheld.  Neither the independent auditor nor the selected
consultants shall disclose to Bard, or any third parties, any information
relating to the business of Cytogen other than information 

                                       32
<PAGE>
 
relating solely to the accuracy of the reports and payments under this
Agreement. In the event the independent auditor determines that there was an
underpayment or overpayment in Commissions, the error shall be reconciled by
payment by the appropriate party to the other within thirty (30) days of
issuance of the auditor's report. Notwithstanding the foregoing, if the auditor
determines that in any audit that there has been an underpayment of Commissions
of ten percent (10%) or more for the period examined, Cytogen hereby agrees to
reimburse Bard for its actual incurred costs in having such audit conducted.

                         ARTICLE 7 - ADVERSE REACTION

     7.1  REPORTING.  Each party agrees to report to the other party in writing
          ---------                                                            
any serious adverse reactions or any side effects which occur or other adverse
events with Product as promptly as possible after receipt of information of such
event (a "Reaction Notice"), but in no event later than three (3) business days
following receipt of a Reaction Notice of any event described in Paragraph
7.2(a) through 7.2(e).  Any such reactions or side effects must be reported (in
full detail if requested) irrespective of whether there is a causal connection
with Product being administered or whether the causal connection is unclear or
presumed to be not likely.  Additionally, each party shall report to the other
in writing, quarterly during the three (3) year period following the Product
Launch Date and annually thereafter 

                                       33
<PAGE>
 
during the remainder of the Term, all other unexpected non-serious adverse
events associated with Product which come to the attention of such party.

     7.2  For purposes of Paragraph 7.1, a serious adverse reaction or side
effect is a reaction or side effect from Product which meets one or more of the
following criteria:

          (a)  a reaction or side effect that is life threatening or fatal;

          (b)  a reaction or side effect that resulted in hospitalization, or if
               the patient was already hospitalized, a reaction or side effect
               which prolonged hospitalization;

          (c)  a reaction or side effect that resulted in severe or permanent
               disability;

          (d)  a reaction or side effect that involved congenital anomaly or
               overdose, or cancer which was not already present at the
               beginning of treatment with Product involved; or

          (e)  a reaction that is considered to be important, significant or
               otherwise medically serious.

          7.3  Each of the parties hereto shall monitor all relevant journals
and media communications for information on factors materially affecting the use
or efficacy of Product and shall promptly inform the other party of such
information.  The 

                                       34
<PAGE>
 
informing party may provide in writing its evaluation of such information.
Either party shall promptly inform the other if it has actual knowledge of any
measures which are necessary to eliminate or minimize any risk associated with
the use of Product, provided however, neither party shall have such obligation
if any such measure would require the disclosure of any information which is
proprietary to it.

                     ARTICLE 8 - CONFIDENTIAL INFORMATION

     8.1  NONDISCLOSURE AND NONUSE.  The parties hereto agree that during the
          ------------------------                                           
Term and during the five (5) year period following the expiration or termination
of this Agreement, each party shall keep completely confidential and shall not
publish or otherwise divulge or use, for its own benefit or for the benefit of
any third party, any information of a proprietary nature furnished to it (the
"Receiving Party") by the other party (the "Disclosing Party") without the prior
written approval of the Disclosing Party in each instance, except:
          
          (a)  as necessary to obtain governmental approval for the marketing of
               Product;
          
          (b)  to consultants, Affiliates and agents who are obligated to
               maintain it in confidence pursuant to written agreements which
               are at least as stringent as the terms of this Article VIII; and
          

                                       35
<PAGE>
 
          (c)  as otherwise may be required by law, regulation or judicial
               order.

     Information of a proprietary nature shall include, but not be limited to,
information concerning a party's products, proposed products, marketing plans,
methods of manufacture, customers or any other information or materials in
whatever form not generally known to the public.

     8.2  EXCEPTIONS.  Nothing in this Article 8 shall prevent disclosure or use
          ----------                                                            
of information which:
          
          (a)  is disclosed orally unless such oral disclosure is reduced to
               writing within thirty (30) days of the oral disclosure and such
               reduction to writing is marked as proprietary or confidential;

          (b)  is already known to the Receiving Party at the time of disclosure
               by the Disclosing Party as evidenced by the Receiving Party's
               business records maintained in the normal course of business;

          (c)  was known to the public at the time of disclosure, or
               subsequently becomes so known through no act or omission of the
               Receiving Party;

          (d)  is lawfully disclosed to the Receiving Party by a non-Affiliate
               having the right to convey such information.

                                       36
<PAGE>
 
                          ARTICLE 9 - INDEMNIFICATION

     9.1  INDEMNIFICATION BY CYTOGEN.  Cytogen hereby agrees to defend
          --------------------------                                  
(utilizing counsel reasonably acceptable to Bard), indemnify, save and hold
Bard, its Affiliates and their respective successors harmless from and against
all claims, damages, liabilities, losses, costs and expenses, including
reasonable attorneys' fees, which arise or result from: (i) the design or
manufacture of Product, or (ii) the promotion of Product by Cytogen or any
Affiliate of Cytogen, (iii) the breach by Cytogen of any of its representations
and warranties set forth in this Agreement, or (iv) the default by Cytogen in
the observance or performance of any obligation imposed upon it hereunder, or
(v) the use by Bard or any Affiliate of Bard of labeling supplied by Cytogen or
marketing, promotional or advertising materials approved by Cytogen in advance
of use, or (vi) the sale or use of Product.  Cytogen shall have no obligation
under this Paragraph 9.1 to the extent that a particular claim, damage,
liability, loss, cost or expense arises or results from: (a) a breach by Bard or
any Affiliate of Bard of a covenant contained in Paragraph 3.5, or (b) the gross
negligence of wilful misconduct of Bard or any Affiliate of Bard.

     9.2  INDEMNIFICATION BY BARD.  Bard hereby agrees to defend (utilizing
          -----------------------                                          
counsel reasonably acceptable to Cytogen), indemnify, save and hold Cytogen, its
Affiliates and their respective 

                                       37
<PAGE>
 
successors harmless from and against all claims, damages, liabilities, losses,
costs and expenses, including reasonable attorneys' fees, which arise or result
from the breach by Bard of any of its representations and warranties set forth
in this Agreement or the default by Bard in the observance or performance of any
obligation imposed upon it hereunder. Bard shall have no obligation to Cytogen
under this Paragraph 9.2 to the extent that a particular claim, damage,
liability, loss, cost or expense falls within Cytogen's obligations under
Paragraph 9.1 or arises or results from the gross negligence or wilful
misconduct of Cytogen or any Affiliate of Cytogen.

     9.3  INFRINGEMENT.  Cytogen hereby agrees to defend (utilizing counsel
          ------------                                                     
reasonably acceptable to Bard), indemnify, save and hold Bard, its Affiliates
and their respective successors harmless from all claims, damages, liabilities,
losses, costs and expenses which arise or result from any third party claim
alleging that the manufacture, use, sale, import, promotion or marketing of
Product, alone or in combination with any other article, infringes a patent(s)
owned by or licensed to the third party claimant.

     9.4  COOPERATION - As a condition precedent to the right to be indemnified
          -----------                                                          
from any claim pursuant to this Article IX, the party claiming the right to be
indemnified (the "Indemnitee"): (i) shall promptly notify the other party (the
"Indemnitor") of 

                                       38
<PAGE>
 
the claim and shall include in its notice all information in its possession
relating to the claim, and (ii) shall fully cooperate with the Indemnitor in the
defense of such claim, and (iii) shall not settle the claim without the prior
written consent of the Indemnitor, it being expressly understood and agreed that
the Indemnitor shall have the right to settle any such claim on such terms as it
deems appropriate.

                       ARTICLE 10 - TERM AND TERMINATION

     10.1 TERM.  This Agreement shall have an initial term commencing on the
          ----                                                              
Effective Date and shall continue thereafter until the tenth anniversary of the
Product Launch Date, unless sooner terminated in accordance with the provisions
of Paragraph 3.3, 11.1 or this Article X.  This Agreement may be renewed on the
same terms and conditions for one (1) or more additional two (2) year periods
upon mutual written agreement of the parties executed not less than ninety (90)
days prior to the expiration of the then current term.

     10.2 FAILURE TO PAY COMMISSIONS.  Bard may terminate this Agreement at any
          --------------------------                                           
time upon Cytogen's failure to pay Commissions due to Bard pursuant to this
Agreement and the continuation of such failure for more than thirty (30) days
after delivery of written notice to Cytogen of such failure.

                                       39
<PAGE>
 
     10.3 MATERIAL BREACH.  Either party may terminate this Agreement upon
          ---------------                                                 
ninety (90) days prior written notice in the event of the other party's breach
of or default under any other material provision of this Agreement, if such
default or breach is not remedied within ninety (90) days from the date of such
notice, except where such default or breach is due to circumstances beyond the
reasonable control of the other party as described in Paragraph 11.7 hereof.

     10.4 FAILURE TO MEET BASELINE SALES.  In the event that Net Sales for any
          ------------------------------                                      
of the four years following the second anniversary of the Product Launch Date
fail to equal or exceed the corresponding Baseline Sales: (i) the parties hereto
shall promptly meet to discuss the reasons for such failure and, with the
participation and approval of the Joint Marketing Committee, develop a plan to
achieve a level of sales in the next succeeding years in excess of Baseline
Sales, and (ii) if Net Sales in the next succeeding year also fail to equal or
exceed the Baseline Sales for such year, then either party may immediately
terminate the Agreement by providing written notice to the other party.

     10.5 BANKRUPTCY.  If, during the term of this Agreement, either party makes
          ----------                                                            
an assignment of this Agreement or generally, for the benefit of creditors, or
becomes insolvent or seeks protection under any bankruptcy, receivership, trust
deed, creditor's arrangement or composition, or if any comparable proceeding is
instituted against the other party and is not dismissed within ninety (90) days
of such institution, then the 

                                       40
<PAGE>
 
other party may terminate this Agreement immediately upon delivery of written
notice thereof.

     10.6 EFFECTS OF TERMINATION.
          ---------------------- 

          10.6.1  Breach by Cytogen - In the event this Agreement is terminated
                  -----------------                                            
by Bard pursuant to Paragraph 10.2 or 10.3, Cytogen agrees to remit to Bard,
within thirty (30) days of the termination of this Agreement, a sum equal to the
amount, if any, by which monies paid by Bard to Cytogen pursuant to Paragraph
6.1 hereof exceed Commissions paid to Bard hereunder.

          10.6.2  Payments - Termination of this Agreement by either party shall
                  --------                                                      
not prejudice the right of Bard to recover Commissions earned but unpaid at the
time of termination.
 
          10.6.3  Marketing Rights.  Upon termination of this Agreement, Bard's
                  ----------------                                             
rights to market and promote Product shall immediately cease and within sixty
(60) days of such termination, Bard shall deliver to Cytogen all marketing and
promotional materials with respect to Product in the possession of Bard or any
of its Affiliates.

                                       41
<PAGE>
 
                        ARTICLE 11 - GENERAL PROVISIONS

     11.1 SALE OF COMPETITIVE PRODUCT - Cytogen hereby acknowledges and agrees
          ---------------------------                                         
that Bard and its Affiliates reserve the right to manufacture, have
manufactured, use, market, promote and sell any Competitive Product.  However,
in the event the Urological Division of Bard sells any Competitive Product in
the U.S. during the Term, Cytogen, as its sole and exclusive remedy, shall have
the right, upon notice to Bard, to terminate this Agreement only with respect to
the U.S.  Further, in the event Bard or any Affiliate of Bard sells any
Competitive Product, during the Term, in any country which constitutes a part of
the Territory (other than the U.S.), Cytogen, as its sole and exclusive remedy,
shall have the right, upon notice to Bard, to terminate this Agreement only with
respect to such country or countries.  If any event referred to in this
Paragraph 11.1 occurs, Bard shall give Cytogen notice thereof within fifteen
(15) business days of the date on which the sale of the Competitive Product
occurs.

     11.2 GOVERNING LAW.  This Agreement shall be governed by and interpreted in
          -------------                                                         
accordance with the laws of the State of New Jersey, within the United States of
America, as though all parties were resident of, and the contract was to be
performed in, New Jersey.

                                       42
<PAGE>
 
     11.3 ENTIRE AGREEMENT.  This Agreement represents the entire Agreement and
          ----------------                                                     
understanding of the parties hereto with respect to the subject matter hereof,
supersedes all previous agreements and understandings related thereto and may
only be amended or modified in writing signed by an authorized representative of
the parties hereto.

     11.4 ASSIGNMENT.  Except as hereinafter provided, neither party may assign,
          ----------                                                            
transfer or otherwise dispose of any of its rights or obligations pursuant to
this Agreement without the prior written consent of the other party, which
consent shall not be unreasonably delayed or withheld.  Either party may assign
this Agreement, upon notice to but without the consent of the other party, to
any person or entity which purchases substantially all of its stock or
substantially all of its cancer diagnostic assets.  Additionally, Cytogen shall
have the right to delegate its obligations under Paragraph 4.2 and Article V to
an Affiliate of Cytogen.  Further, Bard shall have the right to delegate its
obligations, if any, outside of the U.S. to one or more of its Affiliates.

     11.5 NOTICE.  All notices under this Agreement shall be in writing and
          ------                                                           
shall be deemed given if sent by telecopier (except for legal process),
certified or registered mail or commercial courier (return receipt or
confirmation of delivery required), or by personal delivery to the party to
receive such notices or

                                       43
<PAGE>
 
other communications called for this Agreement at the following addresses (or at
such other address for a party as shall be specified by such party by like
notice):

          CYTOGEN CORPORATION
          600 College Road East
          Princeton, New Jersey 08540

          Attention:  General Counsel

          C.R. BARD, INC.
          730 Central Avenue
          Murray Hill, New Jersey  07974

          Attention:  General Counsel


Copy to:

          BARD UROLOGICAL DIVISION
          C.R. Bard Inc.
          8195 Industrial Blvd.
          Covington, Georgia 30209

          Attention:  Vice President and
                      General Manager


     11.6 LIMITATION ON LIABILITY.  In no event shall either party be liable to
          -----------------------                                              
the other for incidental or consequential damages, including, without
limitation, loss of profits or punitive damages even if such party shall have
been advised of the possibility of the same.  [INFORMATION OMITTED AND FILED
SEPARATELY WITH THE COMMISSION UNDER RULE 24B-2.], Bard's right to monetary
damages upon a breach of this Agreement by Cytogen shall be limited to
[INFORMATION OMITTED AND FILED SEPARATELY WITH THE COMMISSION UNDER RULE 24B-
2.].  Notwithstanding anything to the contrary contained in this Agreement,
Bard's liability to Cytogen, under Article 9 or otherwise, shall be

                                       44
<PAGE>
 
limited: (i) during the period from the Effective Date through the first 
anniversary of the Product Launch Date, to the greater of [Information omitted 
and filed separately with the Commission under Rule 24b-2.] or [Information 
omitted and filed separately with the Commission under Rule 24b-2.]: (a) the 
date on which such liability is determined by a court of competent jurisdiction 
from which no appeal is taken, or (b) the date on which such liability is paid 
by Cytogen in accordance with Paragraph 9.4 (iii), if no such determination by 
the court of competent jurisdiction exists, or (c) if neither (a) nor (b) apply,
the date on which Bard last incurs defense costs in connection with such 
liability, (ii) from and after the first anniversary of the Product Launch Date,
to the greater of [Information omitted and filed separately with the Commission 
under Rule 24b-2.] or [Information omitted and filed separately with the 
Commission under Rule 24b-2.]: (a) the date on which such liability is 
determined by a court of competent jurisdiction from which no appeal is taken, 
or (b) the date on which such liability is paid by Cytogen in accordance with 
Paragraph 9.4 (iii), if no such determination by the court of competent 
jurisdiction exists, or (c) if neither (a) nor (b) apply, the date on which Bard
last incurs defense costs in connection with such liability.


     11.7 FORCE MAJEURE.  Except for the obligation to make payments under this
          -------------                                                        
Agreement, each of the parties hereto shall be excused from the performance of
its obligations hereunder in the event such performance is prevented by force
majeure, and such excuse shall continue so long as the condition constituting

                                       45
<PAGE>
 
such force majeure continues and for thirty (30) days after the termination of
such condition.  For the purposes of this Agreement, force majeure is defined to
include causes beyond the control of the parties hereto, including without
limitation, acts of God, acts, resolutions or laws of any government, war, war
like conditions, civil commotion, destruction of production facilities or
materials by fire, earthquake or storm, labor disturbances, epidemic and failure
of public utilities or common carriers.

     11.8 PUBLICITY.  Neither party shall make any press release or other
          ---------                                                      
similar public disclosure or announcement concerning this Agreement, without the
prior written consent of the non-disclosing party, except as otherwise required
by law.  Consent will be deemed granted if no response is received from the non-
disclosing party within fifteen (15) days of its confirmed written request for
approval from the disclosing party.  Notwithstanding the foregoing, in the event
such disclosure or public announcement is required to be made on a more
immediate basis in order to comply with applicable state or federal securities
laws, then approval will be deemed granted if no response is received from the
non-disclosing party within the timeframes required by law; provided, however,
that the disclosing party provides the non-disclosing party with notice of the
legally required timeframe for approval of the disclosure at the time of
providing a copy of the proposed disclosure or announcement.

 

                                       46
<PAGE>
 
     11.9   SURVIVAL OF RIGHTS.  All provisions of this Agreement which by their
            ------------------                                                  
nature are intended or required to be observed or performed after the expiration
or termination of this Agreement, including but not limited to the provisions of
Articles 6, 8, 9, and Paragraphs 10.6.1, 10.6.2, 10.6.3, 11.2, 11.3, 11.6 and
11.9 shall survive the expiration or termination of this Agreement.

     11.10  COUNTERPARTS.  This Agreement may be executed in any number of
            ------------                                                  
counterparts, each of which shall be an original and all of which shall
constitute but one and the same document.


     11.11  SEVERABILITY.  Any provision of this Agreement that is prohibited or
            ------------                                                        
unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective
to the extent of such prohibition or unenforceability without invalidating the
remaining provisions hereof, and any such prohibition or unenforceability in any
jurisdiction shall not invalidate or render unenforceable such provision in any
other jurisdiction.

     11.12  CAPTIONS - The Article and Paragraph headings of this Agreement are
            --------                                                           
intended for convenience of reference only and shall not define or limit the
provisions of this Agreement.

     11.13  WAIVERS - The failure of either of the parties to exercise their
            -------                                                         
respective rights under this Agreement regarding any misrepresentation, breach
or default shall not prevent the party from exercising such or any other right
hereunder regarding such or any subsequent misrepresentation, breach or default.

                                       47
<PAGE>
 
     11.14  RELATIONSHIP OF PARTIES - It is expressly agreed that the
            -----------------------                                  
relationship of the parties herein created is that of independent contractors.
Further, it is expressly agreed that nothing contained herein is intended to
create, nor shall it be deemed or construed as creating, an agency relationship,
an employer-employee relationship or a relationship of joint ventures.  Neither
party shall represent to any third party that it has authority to bind the other
in any manner.

     11.15  INSURANCE - During the Term, Cytogen, at its expense, shall maintain
            ---------                                                           
a policy of comprehensive general liability insurance with products liability
endorsement providing coverage relating to Product on a claims made basis in a
minimum amount of five million dollars ($5,000,000) annual aggregate.  Within
thirty (30) days of the Effective Date and annually thereafter, Cytogen shall
furnish Bard with a certificate evidencing such insurance coverage.

          IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the date first above written.

                                    CYTOGEN CORPORATION


                                    By: /s/ Richard J. Walsh
                                        ----------------------

                                    Title: Vice President,
                                           Corporate Development

 
                                    C.R. BARD, INC.


                                    By: /s/ Benson F. Smith
                                        ---------------------

                                    Title: President and COO

                                       48
<PAGE>
 
                                                                       Exhibit A
                                                                       ---------

                                  Commissions
                                  -----------

<TABLE> 
<CAPTION> 

Period                              Commission Rate
- ------                              ---------------
<S>                                 <C> 
During the [*]                      [*] of total
                                    Net Sales

During the [*]                      [*] of that portion of
                                    Net Sales which are less
                                    than or equal to Baseline
                                    Sales, and [*] of 
                                    Incremental Sales

Commencing with the [*]             [*] on that portion of
                                    Net Sales which are less
                                    than or equal to Baseline
                                    Sales, and [*] on
                                    Incremental Sales
</TABLE> 
- ------------------------------------

1.  During the [  *  ] only, Baseline Sales shall mean the amount of Net Sales 
achieved during the preceding twelve month period multiplied by a fraction, the 
numerator of which is the number of days in this period and the denominator of 
which is 365. For example, if the Baseline Sales for the [  *  ] was $10 million
and the [  *  ] was January 31, 1997, the Baseline Sales for the [  *  ] only 
would be equal to $9,150,000 (10 million x 334/365).

2.  During the first calendar year following the [  *  ], the Commission Rate 
for Incremental Sales shall be [  *  ] and it shall increase by [  *  ] each 
year thereafter until it reaches the level of [  *  ] at which time it shall 
remain constant.

*   Information omitted and filed separately with the Commission under 
    Rule 24b-2.

                                      49
<PAGE>
 
                                   Exhibit B
                                   ---------

 .    Approval by Cytogen Clinical Investigations/Technical Operations.

 .    Experience with immunoscintigraphy or similar techniques.

 .    State-of-the-art camera/computer system.

 .    Knowledgeable nuclear medicine technologists/physicians.

 .    Clinical study or consulting agreement.

 .    Access to a multispecialty physician group.

 .    Affiliation with a healthcare delivery system (IHN, oncology group
     practice, cancer carve-out).

 .    Hospital with a large cancer patient pool under an indemnity contract
     (Medicare/HCFA or HMO agreement).

                                       50
<PAGE>
 
                                   Exhibit C
                                   ---------

1.   Brooke Army Medical Center
     Ft. Sam Houston, TX  78234-6200

2.   Cedars Sinai Medical Center
     Los Angeles, CA  90048

3.   Cleveland Clinic Foundation
     Cleveland, OH  44195

4.   Columbia Presbyterian
     New York, NY  10032

5.   George Washington University
     Washington, DC  20037

6.   Georgia Baptist Medical Center
     Atlanta, GA  30312

7.   Harper Hospital
     Detroit, MI  48201

8.   Harris Methodist
     Fort Worth, TX  76108

9.   Henry Ford Hospital
     Detroit, MI  48202

10.  University of Illinois
     Chicago, IL  60612

11.  Iowa City VAMC
     Iowa City, IA  52242

12.  Jersey Shore Medical Center
     Neptune, NJ  07754

13.  Jewish Hospital
     St. Louis, MO  63110

14.  Johns Hopkins Bayview
     Baltimore, MD  21224-2780

15.  John Peter Smith
     Fort Worth, TX  76104

16.  Lehigh Valley Hospital
     Allentown, PA  18105

17.  Louisiana State University
     Shreveport, LA  71130

                                       51
<PAGE>
 
18.  Loyola University
     Maywood, IL  60153

19.  Mayo Clinic
     Rochester, MN  55905

20.  M.D. Anderson Cancer Center
     Houston, TX  77030

21.  Medical College of WI
     Milwaukee, WI  53226

22.  MetroHealth Medical Center
     Cleveland, OH  44109

23.  Memorial Medical Center
     Springfield, IL  62781

24.  University of Miami
     Miami, FL  33136

25.  Montefiore Medical Center
     Bronx, NY  10467

26.  Morton Plant Hospital
     Clearwater, FL

27.  Mount Sinai Hospital
     New York, NY  10029

28.  Ohio State University
     Columbus, OH  43210

29.  Our Lady of the Lake
     Baton Rouge, LA  70808

30.  Queens Medical Center
     Honolulu, HI  96813

31.  Scott & White Memorial
     Temple, TX  76508

32.  St. Francis Hospital
     Topeka, KS  66606

33.  St. Joseph's Hospital
     Houston, TX  77002

34.  St. Luke's Medical Center
     Milwaukee, WI  53215

35.  St. Mary's Medical Center
     Saginaw, MI  48601

                                       52
<PAGE>
 
36.  St. Vincent's Hospital
     Portland, OR

37.  SUNY at Buffalo
     Buffalo, NY  14214

38.  Sutter General Hospital
     Sacramento, CA  95816

39.  Tri-City Medical Center
     Oceanside, CA  92056

40.  University of Washington
     Seattle, WA
 

                                       53


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