IMMUNE RESPONSE CORP
10-Q/A, 1999-03-23
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>

                               UNITED STATES
                     SECURITIES AND EXCHANGE COMMISSION
                           WASHINGTON, D.C. 20549


                                FORM 10-Q/A

                               Amendment No. 1


(Mark One)

[X]  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES 
     EXCHANGE ACT OF 1934
     For the Quarter ended June 30, 1998.

                                       or

[ ]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
     EXCHANGE ACT OF 1934
     For the transition period from __________ to __________.


Commission File No. 0-18006


                          THE IMMUNE RESPONSE CORPORATION
                          -------------------------------
                            (Exact name of registrant as
                             specified in its charter)

                  Delaware                                33-0255679
      -------------------------------                ------------------
      (State or other jurisdiction of                  (I.R.S. Employer
       incorporation or organization)                Identification No.)


                                 5935 Darwin Court
                             Carlsbad, California 92008                   
               ----------------------------------------------------
               (Address of principal executive offices and zip code)



                                    (760) 431-7080                           
                ----------------------------------------------------
                (Registrant's telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days.
     YES    X            NO  
          -----               ------
As of March  7, 1998 , 23,197,810 shares of common stock were outstanding.


                                     -1-


<PAGE>

                          THE IMMUNE RESPONSE CORPORATION

                                      INDEX


PART II:  OTHER INFORMATION

<TABLE>
<CAPTION>

                                                           PAGE
<S>                                                        <C>
Item 6:  Exhibits and Reports on Form 8-K                     3

SIGNATURES                                                    4
</TABLE>




                                     -2-


<PAGE>

                          THE IMMUNE RESPONSE CORPORATION

                           PART II-OTHER INFORMATION


ITEM 6:   EXHIBITS AND REPORTS ON FORM 8-K


(a)  Exhibits

<TABLE>
<S>            <C>
     3(i)*     Restated Certificate of Incorporation of the Company, as amended
               by Certificate of Designations, Preferences and Rights of Series
               F Convertible Preferred Stock. 

     10.1*     Securities Purchase Agreement dated as of April 24, 1998 by and
               among the Company and Investors. 

     10.2*     Registration Rights Agreement dated as of April 24, 1998 by and
               among the Company and the Investors.

     10.65(1)  Letter of Intent as of June 11, 1998 between Agouron
               Pharmaceuticals, Inc. and The Immune Response Corporation.

     10.66(1)  Common Stock Purchase Agreement dated as of June 11, 1998 between
               Agouron Pharmaceuticals, Inc. and The Immune Response
               Corporation.

     27**      Financial Data Schedule.
</TABLE>

(b)  Reports on Form 8-K 

     A report on Form 8-K dated April 24, 1998, was filed by The Immune Response
     Corporation reporting under Item 5 that the Company had sold 200 shares of
     its Series F Convertible Preferred Stock in return for gross proceeds of
     $10 million.

- ----------
*    Incorporated by reference to exhibits of the same number filed with the
     Company's Form 8-K dated April 24, 1998 (File No. 0-18006).
**   Previously filed.
(1)  The Registrant has requested confidential treatment of certain portions of
     these agreements.


                                     -3-


<PAGE>

                          THE IMMUNE RESPONSE CORPORATION

                                     SIGNATURES

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


                                        THE IMMUNE RESPONSE CORPORATION



Dated:  March 22, 1999                  By:  /s/ Dennis J. Carlo
                                             --------------------------
                                             Dennis J. Carlo
                                             President, Chief Executive 
                                             Officer and Chief Scientific
                                             Officer


Dated:  March 22, 1999                  By:  /s/ Rand P. Mulford
                                             ----------------------------
                                             Rand P. Mulford
                                             Chief Financial Officer and 
                                             Senior Vice President, 
                                             Corporate Development


                                     -4-
<PAGE>

                          THE IMMUNE RESPONSE CORPORATION

                              INDEX TO EXHIBITS

<TABLE>
<CAPTION>

Exhibit Number      Description of Document
- -------------       -----------------------
<S>                 <C>
  3(i)*             Restated Certificate of Incorporation of the Company, as
                    amended by Certificate of Designations, Preferences and
                    Rights of Series F Convertible Preferred Stock. 

  10.1*             Securities Purchase Agreement dated as of April 24, 1998 by
                    and among the Company and Investors. 

  10.2*             Registration Rights Agreement dated as of April 24, 1998 by
                    and among the Company and the Investors.

  10.65(1)          Letter of Intent as of June 11, 1998 between Agouron
                    Pharmaceuticals, Inc. and The Immune Response Corporation.

  10.66(1)          Common Stock Purchase Agreement dated as of June 11, 1998
                    between Agouron Pharmaceuticals, Inc. and The Immune
                    Response Corporation.

  27**              Financial Data Schedule.
</TABLE>



- ----------
*    Incorporated by reference to exhibits of the same number filed with the
     Company's Form 8-K dated April 24, 1998 (File No. 0-18006).
**   Previously filed.
(1)  The Registrant has requested confidential treatment of certain portions of
     these agreements.




                                     -5-

<PAGE>

                              LETTER OF INTENT



     THIS LETTER OF INTENT is made on the 11th day of June 1998, by and between
Agouron Pharmaceuticals, Inc., a corporation duly organized and existing under
the laws of the state of California, having a principal place of business at
10350 North Torrey Pines Road, La Jolla, California 92037 (hereinafter called
"Agouron"), and The Immune Response Corporation, a corporation duly organized
and existing under the laws of the state of Delaware, having a principal place
of business at 5935 Darwin Court, Carlsbad, California 92008 (hereinafter called
"Immune Response").  Agouron and Immune Response are sometimes hereinafter
referred to as a party (collectively "parties") to this Agreement.

                                     BACKGROUND

In accordance with the terms of this Letter of Intent, Immune Response has
agreed to license to Agouron the exclusive rights necessary or useful for the
registration and/or commercialization of the product known as REMUNE, a non-
infectious intact Human Immunodeficiency Virus ("HIV") devoid of outer envelope
proteins.  This Letter of Intent, which shall be binding on the parties, sets
forth the basic license terms upon which the parties have agreed.  The full
terms of the license will be set forth in a definitive agreement to be prepared
as described below.


     NOW, THEREFORE, the parties agree as follows:

1.   TERMS.  The parties hereby enter into this Letter of Intent to confirm 
their entering into a license agreement on terms substantially in accordance 
with those contained in Exhibit A hereto.  The parties acknowledge that 
Exhibit A states the basic terms of the understanding between the parties and 
anticipate the further negotiation and preparation of an agreement containing 
the full terms of the license between the parties ("Definitive Agreement").  
Each party agrees to act in good faith in an effort to negotiate, execute and 
deliver the Definitive Agreement on or before September 1, 1998.  If the 
Definitive Agreement is not executed by September 1, 1998, the provisions of 
this Letter of Intent shall continue in effect until the Definitive Agreement 
is executed, and the parties will continue to negotiate in good faith in an 
effort to execute and deliver the Definitive Agreement as soon as possible.

2.   DISCLOSURE.  The parties shall jointly prepare and release a statement
about the existence of this Letter of Intent and of the license between Agouron
and Immune Response.  Except as agreed to by the parties, neither Agouron nor
Immune Response shall release any further information to any third party who is
not under an obligation of confidentiality with respect thereto about any of the
terms of this Letter of Intent, or of the license, or of results of clinical
trials of REMUNE, without the prior written consent of the other, which consent
shall not unreasonably be withheld.  This prohibition includes, but is not
limited to, press releases, educational and scientific conferences, promotional
materials and discussions with the media.  If a party determines that it is
required by law to release information to any third party regarding such
matters, it shall notify the other party of this fact prior to releasing the
information.  The notice to the other party shall include the text of the
information proposed for release.  The

* * * - Confidential treatment requested. Sections of text which have been
omitted and for which confidential treatment is requested are noted with "***".
An unredacted version of this document has been filed separately with the
Securities and Exchange Commission.


                                     1


<PAGE>

other party shall have the right to confer with the notifying party regarding 
the necessity for the disclosure and the text of the information proposed for 
release.

3.   MISCELLANEOUS.  This Letter of Intent contains the entire agreement between
the parties as of the date hereinabove written on the matters set forth herein
and shall be governed by and construed in accordance with the laws of the State
of California.  Exhibit A describes the parties' understanding with respect to
the registration and commercialization of the "Product" as defined therein. This
Letter of Intent, including Exhibit A, shall not be amended, supplemented or
otherwise modified, except by an instrument in writing signed by duly authorized
officers of both parties.  Each party shall bear all of the expenses incurred by
it in connection with the negotiation and preparation of this Letter of Intent
and the Definitive Agreement.  Each party represents and warrants that it is not
presently bound by any agreement with any third party which limits its
performance of any of the obligations or activities provided for under this
Letter of Intent or contemplated by the Definitive Agreement.  Immune Response
represents and warrants that it is not aware of any patents, patent applications
and/or know-how that it does not have the right to license to Agouron which is
necessary or useful for commercialization of Product by Agouron.  Immune
Response further represents and warrants that it will not enter into any
agreements which limit Immune Response's performance of any of the obligations
or activities provided for under this Letter of Intent or contemplated by the
Definitive Agreement.  Immune Response, at its expense, shall obtain any
government approval(s) not related to drug product registration, which are
required to enable this Agreement to become effective.  At any time after
October 15, 1998, Agouron may elect to immediately terminate, in their entirety,
all of its rights and obligations under this Letter of Intent and the Definitive
Agreement, except that Agouron may exercise this right to terminate only on the
basis of its concerns related to the safety, efficacy, competitiveness, or
commercial feasibility of Product.


     IN WITNESS WHEREOF, the parties hereto have executed this Letter of Intent
by their respective officers thereunto duly authorized, as of the date
hereinabove written.  This Letter of Intent may be executed in counterparts and
all of such counterparts taken together shall be deemed to constitute one and
the same instrument.



 THE IMMUNE RESPONSE CORPORATION         AGOURON PHARMACEUTICALS, INC.


By:       s/Dennis J. Carlo             By:       s/Peter Johnson
          --------------------                    --------------------
Name:     Dennis J. Carlo               Name:     Peter Johnson
          --------------------                    --------------------
Title:    President                     Title:    President 
          --------------------                    --------------------


By:       s/Charles J. Cashion          By:       s/Gary Friedman     
          --------------------                    --------------------
Name:     Charles J. Cashion            Name:     Gary Friedman  
          --------------------                    --------------------
Title:    Senior VP                     Title:    Secretary  
          --------------------                    --------------------


                                      2 


<PAGE>
                                         
                                     EXHIBIT A


Immune Response, under the terms and conditions specified below, hereby 
grants Agouron the exclusive right to use, offer for sale, sell and/or 
import, in or into the Licensed Territory, the Product under applicable 
Immune Response Patent Rights (including claims therein relating to 
compositions and methods of use) and using applicable Immune Response 
Know-How. 

1.   Definitions:  Except as otherwise set forth herein, items containing an
     initial capitalized letter shall have the meaning stated below or in the
     Letter of Intent to which this Exhibit A is an attachment ("LOI"). 

     (a)  "Product" means a pharmaceutical product comprising a non-infectious
          intact HIV devoid of outer envelope proteins whose manufacture, use or
          sale infringes (in the absence of the license rights granted under
          this Exhibit A) a valid claim (which has not been abandoned,
          disclaimed or declared invalid in a non-appealable order) included in
          an issued patent within the Immune Response Patent Rights.
     
     (b)  "Licensed Territory" means all countries of the world except the
          countries listed in Schedule 1. 
     
     (c)  "Affiliate" means any person, organization or entity which is,
          directly or indirectly, controlling, controlled by, or under common
          control with Agouron or Immune Response, as the case may be.  The term
          "control" (including, with correlative meaning, the terms "controlled
          by" and "under common control with"), as used with respect to any
          person or entity, means the possession, directly or indirectly, of the
          power to direct or cause the direction of the management and policies
          of such person, organization or entity, whether through the ownership
          of voting securities, or by contract, or court order, or otherwise. 
          The ownership of voting securities of a person, organization or entity
          shall not, in and of itself, constitute "control" for purposes of this
          definition, unless said ownership is of a majority of the outstanding
          securities entitled to vote of such person, organization or entity. 
          Affiliate shall also mean a limited partnership in which a subsidiary
          of Agouron and/or Immune Response is a general partner.
     
     (d)  "Immune Response Patent Rights" means (i) the patents and the patent
          applications referred to in Schedule 2 of this Exhibit A; (ii) all
          patents arising from said applications, and all patents and patent
          applications based on, claiming the priority date(s) of, or
          corresponding to any of the foregoing; or (iii) any reissues,
          extensions (or other governmental actions that provide exclusive
          rights to the patent holder in the patented subject matter beyond the
          original patent expiration date), substitutions, confirmations,
          registrations, revalidations, re-examinations, additions,
          continuations, continuations-in-part, or divisions of or to any of the
          foregoing. 


*** - Confidential treatment requested.  Sections of text which have been
omitted and for which confidential treatment is requested are noted with "***". 
An unredacted version of this document has been filed separately with the
Securities and Exchange Commission.


                                  A-1


<PAGE>

     (e)  "Immune Response Know-How" means any know-how, trade secret,
          experimental data, formula, expert opinion, experimental procedure,
          and other confidential and/or proprietary information specifically
          concerning the Product that is Controlled by Immune Response and that
          is necessary or useful for either:  (i) the formulation, manufacture,
          use and/or application of the Product; or (ii) obtaining registration
          of the Product. 

     (f)  "Control" and "Controlled" mean possession of the ability to grant a
          license or sublicense as provided for herein without violating the
          terms of any agreement with, or arrangement with, any third party. 
     
     (g)  The terms "Net Sales," "Pre-Tax Profits," "Allowable Expenses" and
          "Manufacturing Transfer Markup" shall be fully defined in the
          Definitive Agreement.  The terms "Net Sales and "Allowable Expenses"
          shall be determined in accordance with generally accepted accounting
          principles and the usual and customary practices of the parties.

2.   As provided below, Immune Response and Agouron shall collaborate to
     complete the current program of clinical trials of the Product, including
     those aimed at achieving registration of the Product in the Licensed
     Territory, in an expeditious manner.  Immune Response and Agouron agree to
     the following basic approaches to the registration of Product in the
     Licensed Territory and the conduct of a committee to be formed to
     coordinate the parties' registration of Product in the Licensed Territory:

     (a)  Immune Response and Agouron shall use reasonable diligence in the
          registration of the Product.
     
     (b)  A committee, co-chaired by representatives of Immune Response and
          Agouron and comprised of representatives from Immune Response and
          Agouron, shall be formed to coordinate the registration of the Product
          in the Licensed Territory and such other matters that the parties
          mutually agree to assign to it.  Decisions of the committee shall be
          made by a unanimous vote of the committee, with each party having one
          (1) vote, regardless of the number of representatives attending a
          meeting.  The committee shall meet regularly, at least four times per
          year, and shall assign study or other registration activities between
          the parties as described in this Paragraph 2. 

     (c)  The committee shall review and discuss the registration plans for any
          countries involved, as well as a coordinated general strategy and
          priorities for preclinical and clinical registration of Product in the
          Licensed Territory.  Each party's members of the committee will
          reasonably consider the adoption of the other party's suggestions and
          will accept as many of such suggestions as are reasonable, based upon
          medical rationale, drug supply, and the need to conduct the studies in
          an expeditious and cost-efficient manner.

     (d)  The parties will share responsibility and authority to obtain
          regulatory approvals for the Product in the Licensed Territory.  If
          there is a disagreement among the parties concerning an issue related
          to the registration of the Product in the Licensed Territory, the
          issue shall be resolved in accordance with the provisions of Paragraph
          17.
     

*** - Confidential treatment requested.


                                    A-2

<PAGE>

     (e)  Agouron, at its expense (except for the cost of clinical supplies of
          Product to be provided to Agouron pursuant to the provisions of
          Paragraph 9), shall, using reasonable efforts, initiate and conduct a
          200-plus patient viral load study to support registration of the
          Product.
     
     (f)  In partial consideration for the rights granted to Agouron, Agouron
          will make up to six (6) quarterly payments of three million dollars
          ($3,000,000) each to support clinical and manufacturing development
          and scale-up of the Product beginning on October 15, 1998, and every
          ninety (90) days thereafter, until the earlier of: (i) January 15,
          2000; or (ii) the approval of a Product License Application ("PLA")
          for the Product in the United States.  The above quarterly payments of
          three million dollars ($3,000,000) each to support clinical and
          manufacturing development and scale-up of the Product shall only be
          due and payable by Agouron if Agouron has not elected to terminate, in
          its entirety, all of its rights and obligations under the LOI and the
          Definitive Agreement before the last permitted payment date for the
          applicable quarterly payment.
     
     (g)  Immune Response will complete, at its expense, the current worldwide
          program of clinical trials of the Product, including the studies
          listed in Schedule 3, and will promptly and fully disclose to Agouron
          the results of the interim and final analyses of data from these
          clinical trials.

     (h)  Agouron will provide, at its expense, regulatory staff support for
          preparation of registration documents as such support is reasonably
          requested by Immune Response.

     (i)  Agouron, notwithstanding the preceding, will be responsible for
          negotiating labeling, pricing and reimbursement for Product with the
          applicable regulatory authorities in the Licensed Territory, and after
          registration of the Product will have the primary responsibility for
          the ongoing correspondence and interaction with the applicable
          regulatory authorities.  Immune Response will provide reasonable
          assistance to Agouron in such interactions, if necessary.

     (j)  Except as provided above, the committee, in assigning the
          responsibility for performing specific tasks or activities related to
          a study or registration activity among the parties, shall make such
          assignments principally based on:  (i) the available resources each of
          the parties can commit to the task or activity; (ii) the expertise of
          each of the parties in conducting or monitoring the task or activity;
          (iii) which party can perform the task or activity in the most
          expeditious manner; and (iv) which party can perform the task or
          activity in the most cost-efficient manner.  A party not responsible
          for the performance of a task or activity may provide advisory and
          support services to the other party.  The committee may establish
          interdisciplinary project teams comprised of representatives of both
          parties having the specialized skills necessary to oversee the conduct
          of specific day-to-day registration 


*** - Confidential treatment requested


                                    A-3



<PAGE>
          activities.  The committee shall establish procedures concerning the
          scope and conduct of activities (including decision-making procedures)
          assigned to such project teams.  
          
     (k)  Each party shall keep the other party informed of its progress in the
          registration of Product, including making oral presentations of
          progress at the committee meetings and/or the preparing of such
          written progress reports as are agreed to by the parties summarizing
          such party's activities during each reporting period and its planned
          activities for the succeeding period.  Each of the parties will assign
          a representative to facilitate communications between the parties;
          each representative shall report to his/her management on the matters
          discussed at each of the meetings of the parties.
     
     (l)  Immune Response will disclose to Agouron all relevant Immune Response
          Know-How, including, but not limited to, data and information which it
          possesses from the pre-clinical and clinical studies of Product
          (including toxicology, pharmacokinetics and formulation studies) in a
          format which will facilitate the preparation for any regulatory
          filings or other correspondence to be filed or made by Agouron.  
     
     (m)  Immune Response will provide assistance to Agouron in accessing
          clinical investigators, clinical sites and testing laboratories for
          the purposes of data interpretation and/or evaluation and conduct of
          registration activities assigned to Agouron. 
     
     (n)  Immune Response shall use its reasonable efforts to coordinate its
          registration activities in any country(s) located outside the Licensed
          Territory with the registration activities of the parties in the
          Licensed Territory.

     (o)  If a licensee of Immune Response wishes to use the results of studies
          conducted by Agouron in such licensee's registration and
          commercialization activities in a country(s) located outside of the
          Licensed Territory, the parties shall enter into good-faith
          discussions about the sharing of the costs of such studies and/or the
          granting to Agouron of equivalent rights to use the results of any
          studies conducted by such licensee. 

     (p)  If development of the Product is discontinued in a country located in
          the Licensed Territory due to safety, efficacy or regulatory issues or
          by mutual agreement of the parties and Agouron is interested in
          developing a substitute drug product whose manufacture, use or sale
          would infringe (in the absence of the license rights granted under
          this Exhibit A) a valid claim (which has not been abandoned,
          disclaimed or declared invalid in a non-appealable order) included in
          an issued patent within the Immune Response Patent Rights, then Immune
          Response and Agouron shall enter into good faith negotiations
          regarding the terms of a license between Immune Response and Agouron
          for such substitute drug product.  During the period that Agouron is
          participating in the development and/or commercialization of the
          Product and/or another drug product whose manufacture, use or sale
          infringes (in the absence of the license rights granted under this
          Exhibit A) a valid claim (which has not been 



*** - Confidential treatment requested


                                    A-4


<PAGE>

          abandoned, disclaimed or declared invalid in a non-appealable order)
          included in an issued patent within the Immune Response Patent Rights,
          Immune Response agrees not to commercialize in the Licensed Territory
          other drug products whose manufacture, use or sale is covered by a
          valid claim (which has not been abandoned, disclaimed or declared
          invalid in a non-appealable order) in an issued patent within the
          Immune Response Patent Rights, on its own or with a third party, other
          than Agouron, its Affiliates or sublicensees. 

3.   In partial consideration for the rights granted to Agouron, Agouron will
     make the following license-fee milestone payments to Immune Response:


<TABLE>
<CAPTION>


     Milestones                                             Payment (US Dollars)
     ----------                                             -------------------
     <S>                                                    <C>
     Within 30 days of execution of the LOI                 $10,000,000

     ***                                                    $       ***

     ***                                                    $       ***

     ***                                                    $       ***
                                                            
     ***                                                    $       ***
                                                            -----------

          Total Milestone Payments                          $45,000,000
                                                            -----------
                                                            -----------
</TABLE>

The above license fee milestone payments shall be payable by Agouron one time
only and shall only be due if Agouron has not elected to terminate, in its
entirety, all of its rights and obligations under the LOI and the Definitive
Agreement before the last permitted payment date for the applicable milestone
payment.
     
4.   Prior to approval of the Product in the United States, Agouron will, "***."








5.   The right of Agouron to market Product in the Licensed Territory shall be
     subject to commercially reasonable marketing efforts by Agouron, on a
     country-by-country basis.  For purposes of this paragraph,
     commercialization efforts undertaken by Agouron's Affiliates and
     sublicensees shall be attributed to Agouron.  Agouron shall begin
     commercial sales of the in a country no later than "***" after the first
     registration of Product in such country; provided, however, that such
     period shall be extended for as long as commercially reasonable marketing
     efforts to begin commercial sales continue.  Following commencement of
     commercial sales in a country, Agouron shall keep Product reasonably
     available to the public; provided, however, that Agouron shall be released
     from this obligation if supply of Product is 


*** - Confidential treatment requested



                                    A-5


<PAGE>

     not available for such country and Agouron is not responsible for arranging
     for the commercial production and supply of Product for such country. 

6.   The term of the license rights granted hereunder will extend on a 
     country-by-country basis from the effective date of the signing of the 
     LOI until the last-to-expire of any patents within the Immune Response 
     Patent Rights covering the Product in such country (as extended by any 
     governmental actions which provide exclusive rights to the patent holder
     in the patented subject matter beyond the original patent expiration 
     date). 

7.   Agouron shall have the right to sublicense its rights in the Product in one
     or more countries of the Licensed Territory.  In the event that Immune
     Response or its Affiliates shall in the future obtain Control of one or
     more additional patent rights and/or know-how necessary or useful for the
     commercialization of the Product in the Licensed Territory, then Immune
     Response shall grant to Agouron an exclusive license consistent with the
     terms of this Exhibit A which adds such patent rights and know-how to the
     scope of the applicable Immune Response Patent Rights and Immune Response
     Know-How, without any additional obligations due from Agouron to Immune
     Response.  To the extent that Immune Response grants rights in the Product
     to a third party and such third party invents or discovers inventions
     and/or know-how necessary or useful for the commercialization of the
     Product in the Licensed Territory, then Immune Response shall use its
     reasonable efforts to secure rights for Agouron to use such inventions and
     know-how.

8.   Immune Response hereby grants to Agouron, its Affiliates and sublicensees a
     perpetual paid-up, royalty-free, worldwide, exclusive right to use Immune
     Response's trademark REMUNE-TM- in the marketing of the Product in the
     Licensed Territory.

9.   Immune Response shall supply Agouron, and Agouron shall purchase from
     Immune Response, sufficient commercial supplies of Product to support and
     sustain the launch and subsequent patient demand for Product in the
     Licensed Territory.  Immune Response hereby agrees to use its commercially
     reasonable efforts to have sufficient manufacturing capacity at its
     facilities to supply Agouron with commercial quantities of Product which
     are necessary for the launch of such Product in the Licensed Territory and
     agrees to have at least a monthly manufacturing capacity for the Licensed
     Territory of "***" unit doses/month of such Product at the time of launch
     of such Product.  Immune Response agrees, at its expense, to maintain
     commercially reasonable inventory and safety stock of Product for the
     Licensed Territory.  Immune Response further agrees to discuss with
     Agouron, in good faith, Immune Response's acquisition of additional
     manufacturing capacity required to meet the projected patient demand for
     the Product for the Licensed Territory.  Immune Response shall use
     diligence in its manufacturing activities and shall provide Agouron such
     technical support for the Product as it may reasonably requested. 
     Commercial supplies of Product shall be supplied to Agouron at Immune
     Response's "***." 


*** - Confidential treatment requested


                                    A-6

<PAGE>

10.  Immune Response agrees not to enter into any contractual arrangement with
     its licensees outside the Licensed Territory which would limit Immune
     Response's ability to fully fulfill Agouron's product requirements for the
     Licensed Territory, or which would require Immune Response to allocate its
     manufacturing capacity among such licensees and Agouron.  If supply
     shortages of Product are expected to occur during a calendar quarterly
     period, and Immune Response's available supply of drug product is required
     to be allocated among Immune Response's licensees, Immune Response shall
     allocate the available supply of drug product among Immune Response's
     licensees during such calendar quarterly period on a pro-rata basis, based
     upon:  (i) the relative utilization of such Product in each licensee's
     respective territories during the twelve (12) month period ending on the
     first day of such calendar quarterly period (based on historical sales data
     during such twelve (12) month, to the extent such data is available); and
     (ii) the projected sales of such Product in each licensee's respective
     territories during the twelve (12) month period commencing with the first
     day of such calendar quarterly period.

11.  If Immune Response is unable to provide Agouron with its requirements of
     Product in a timely and cost-efficient manner, Immune Response agrees to
     assist Agouron in the identification of alternative low-cost manufacturing
     sources for the Product, including but not limited to, access to current
     suppliers of starting materials, intermediates, bulk material and/or
     finished Product.  Immune Response in such circumstances will grant Agouron
     the non-exclusive worldwide right to make and have made Product under
     applicable Immune Response Patent Rights and Immune Response Know-How
     relating to processes, intermediates and materials for manufacturing
     Product, and will provide to Agouron without charge, to the extent
     available, technical and manufacturing assistance and use of its technology
     and proprietary information for the Product, including information on its
     analytical methods, validation reports and manufacturing processes. 

12.  Pre-Tax Profits generated from aggregate Net Sales and royalties from
     Products in the Licensed Territory on a country-by-country basis shall be
     shared equally by Immune Response and Agouron on a fifty-fifty basis. 
     "***."



*** - Confidential treatment requested

                                     A-7

<PAGE>

13.  At any time after October 15, 1998, Agouron may elect to immediately
     terminate its development obligations in the Licensed Territory for Product
     under the LOI and the Definitive Agreement, except that Agouron may
     exercise this right to terminate only on the basis of its concerns related
     to the safety, efficacy, competitiveness, or commercial feasibility of
     Product.  In the event that Agouron elects to terminate its development
     obligations for Product under the LOI and the Definitive Agreement, Immune
     Response, its Affiliates and sublicensees shall be free, without any
     further action by Immune Response or Agouron, to develop and/or
     commercialize Product in the Licensed Territory, on their own, or with any
     third party, and to retain, use and disclose to any such third party
     information and materials that have been developed by Agouron in its
     development activites for Product; provided, that Immune Response shall not
     disclose to such third party the confidential and proprietary information
     of Agouron (other than clinical, regulatory and manufacturing information
     and materials specifically relating to Product).  In the event of the
     termination of Agouron's development obligations in the Licensed Territory
     for Product under the LOI and the Definitive Agreement, the licenses
     granted to Agouron to use, offer for sale, sell and/or import, in or into
     the Licensed Territory, the Product under applicable Immune Response Patent
     Rights and using applicable Immune Response Know-How, shall be terminated. 
     Agouron shall transfer ownership of any dossiers for Product in the
     Licensed Territory to Immune Response, and shall cooperate with Immune
     Response to effect an orderly transition of Agouron's development 
     responsibilities in the Licensed Territory to Immune Response.

14.  At any time after October 15, 1998, Agouron may elect to immediately
     terminate, on a country-by-country basis, its marketing rights for Product
     in the Licensed Territory under the LOI and the Definitive Agreement,
     except that Agouron may exercise this right to terminate only on the basis
     of its concerns related to the safety, efficacy, competitiveness, or
     commercial feasibility of Product.  In the event that Agouron elects to
     terminate its marketing rights for Product in a country:  (i) the licenses
     granted to Agouron to use, offer for sale, sell and/or import, in or into
     such country, the Product under applicable Immune Response Patent Rights
     and using applicable Immune Response Know-How, shall be terminated, and
     Immune Response and its Affiliates and sublicensees shall be free to market
     such Product in such country, on its own, or with any third party; (ii)
     Agouron shall transfer ownership to Immune Response of any dossiers for
     Product in such country; and (iii) Agouron shall cooperate with to Immune
     Response to effect an orderly transition of Agouron's marketing
     responsibilities in such country to Immune Response.

15.  Immune Response, in accordance with the reasonable directions of Agouron,
     shall prepare, file, prosecute, maintain and extend:  (i) patent
     applications and patents included in the Immune Response Patent Rights; and
     (ii) applicable Immune Response trademarks.  Immune Response shall own any
     Immune Response Patent Rights and Immune Response trademarks and shall be
     responsible for all preparation, filing, prosecution, maintenance,
     extension and enforcement expenses for such Immune Response Patent Rights
     and Immune Response trademarks.  Within fourteen (14) days after the
     execution of the LOI, Immune Response shall provide Agouron with copies of
     the material patent prosecution file histories for the Immune Response
     Patent Rights.  Immune Response shall be solely responsible for  any 


*** - Confidential treatment requested

                                      A-8

<PAGE>

     royalties or other payments due to Rhone-Poulenc Rorer Inc. (including
     payments due because of license fees or commercial sales of the Product)
     because of their previously contractual arrangement (or the termination
     thereof) involving the Product.  "***."






16.  This Agreement shall be assignable by a party with the prior written
     consent of the other party.  Any assignment (other than to an Affiliate)
     without the prior written consent of the other party shall be void.  If
     this Agreement is assigned to an Affiliate of a party, the assigning party
     shall still be responsible for all of its obligations specified in this
     Agreement.  Notwithstanding the preceding, the LOI shall be assignable to
     the transferee or successor company in the event of:  (i) a sale or
     transfer of all or substantially all of a party's assets; or (ii) the
     merger or consolidation of the party with another company.

17.  If the representatives of the parties are unable to reach agreement on a
     decision required under the terms of the LOI, the issue shall be submitted
     for consideration, in the case of Immune Response, to a designee of its
     Chief Executive Officer, and, in the case of Agouron, to a designee of its
     Chief Executive Officer.  If they are unable to agree, then the Chief
     Executive Officers of the parties shall agree upon the appropriate
     decision.  If the Chief Executive Officers of the parties are unable to
     reach agreement on a decision required of them, then the issue shall be
     settled by arbitration in San Diego, California in accordance with the
     Commercial Arbitration Rules of the American Arbitration Association then 
     in effect.  The decision of the arbitrator(s) shall be final and binding on
     all parties.  The cost of such arbitration shall be borne by the 
     non-prevailing party, unless otherwise decided by the arbitrator(s). 
     
18.  "***." 









19.  Neither party shall be held liable or responsible to the other party nor be
     deemed to have defaulted under or breached the LOI for the failure or delay
     in fulfilling or performing any term of the LOI to the extent, and for so
     long as, such failure or delay is caused by or results from causes beyond
     the reasonable control of the affected party, including but not limited to
     fire, floods, embargoes, war, acts of war (whether war is declared or not),
     insurrections, riots, civil commotions, strikes, lockouts or other labor
     disturbances, acts of God, or acts, omissions or delays in acting by any
     governmental authority or the other party.

*** - Confidential treatment requested


                                      A-9


<PAGE>

20.  In partial consideration for the rights granted to Agouron, Agouron will
     purchase from Immune Response two million dollars ($2,000,000) of
     unregistered Immune Response Common Stock on each of the purchase dates
     listed below at the premiums to Fair Market Value ("FMV") set forth
     opposite the applicable purchase date: 

<TABLE>
<CAPTION>


      Purchase Date                                     Premium
      ---------------------                             --------
      <S>                                               <C>
      Execution Date of LOI                             50%
      10/15/98                                          ***
      1/15/99                                           ***
      4/15/99                                           ***
      7/15/99                                           ***
      10/15/99                                          ***
      1/17/00                                           ***
</TABLE>

FMV shall mean the average closing price of Immune Response Common Stock
for the five trading days immediately preceding the above purchase dates;
provided, however, that if the FMV of Immune Response Common Stock is "***"
on the applicable purchase date, the premium to FMV shall be "***."
Agouron's obligation to purchase Immune Response Common Stock shall
terminate with respect to any purchase obligations whose applicable
purchase dates occur after Agouron has elected to terminate, in its
entirety, all of its rights and obligations under the LOI and the
Definitive Agreement.





*** - Confidential treatment requested

                                      A-10


<PAGE>

                                   SCHEDULE 1

                 COUNTRIES NOT INCLUDED IN THE LICENSED TERRITORY


The following countries, subject to the provisions of Paragraph 18 of Exhibit A,
are excluded from the Licensed Territory "***:"

***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***


The following countries, subject to the provisions of Paragraph 18 of Exhibit 
A, are excluded from the Licensed Territory "***."

***
***
***
***
***
***
***
***
***
***



*** - Confidential treatment requested

                                   S-1


<PAGE>

                            SCHEDULE 2

                  IMMUNE RESPONSE PATENT RIGHTS


U.S. Patent No. 5,256,767, issued October 26, 1993, from U.S. Patent
Application Serial No. 07/975,899, filed November 10, 1992.

"***."

"***."












*** - Confidential treatment requested

                                    S-2


<PAGE>

                                SCHEDULE 3

SUMMARY OF CLINICAL TRIALS OF PRODUCT BEING CONDUCTED BY IMMUNE RESPONSE


1.   Trial 806 is a multi-center, double-blind, Phase III clinical end point
     study.  Patients are HIV positive with CD4 counts between 300 and 549
     cells/mul.

2.   Trial 816 is a multi-center, double-blind, Phase II study intended to
     evaluate the combination of REMUNE-TM- and triple antiviral drug therapy
     (AZT, 3TC and Crixivan) on the induction of an HIV-1 specific immune
     response.  Patients are HIV positive with CD4 counters > 350 cells/ul.

3.   Trial 2102 is a multi-center, double-blind, adjuvant-controlled, Phase II
     study of REMUNE plus AZT and ddI versus AZT and ddI alone in HIV-infected
     subjects.  The trial is being conducted in Spain and patients have CD4
     counts between 300 and 700 cells/mul.

4.   Trial 808 is a Phase I study to evaluate the safety and immunogenicity of
     REMUNE in children with HIV-infection.

5.   The Switzerland trial is a single center, randomized, open label, Phase II
     study combining antiviral therapy (1592U89) plus Nelfinavir plus Saquinavir
     or 141W94) alone or antiviral therapy plus immune-based therapy
     (subcutaneous interleukin-2 or REMUNE) in antiviral naive HIV-1 infected
     subjects with CD-4 + counts > 250 cells/mul.
     
6.   The England trial is a single center, randomized, open labeled Phase I
     study of antiviral therapy (two nucleoside analogues and at least one
     protease inhibitor) versus antiviral therapy plus IL-2; antiviral therapy
     plus IL-2 plus REMUNE; antiviral therapy plus REMUNE.  Patients are HIV
     positive with CD4 counts > 300 cells/mul.

7.   Trial 818 is a Phase II study intended to evaluate the combination of
     interferon-alpha (IFN) and REMUNE on HIV-1 specific immunogenicity in HIV-1
     infected subjects with CD-4 counts > 300 cells/mul.
     
8.   Trial 2101B is a Phase II, double-blind, randomized, adjuvant controlled
     study of REMUNE.

9.   Trial 822 is a randomized, double-blind, adjuvant controlled, research
     study to evaluate the combination of REMUNE and HAART on the induction of
     HIV-1 specific immune responses.
     

                               S-3

<PAGE>

                          COMMON STOCK PURCHASE AGREEMENT


     This Common Stock Purchase Agreement ("Agreement") is made and entered into
as of June 11, 1998 by and between THE IMMUNE RESPONSE CORPORATION., a Delaware
corporation (hereinafter referred to as the Company) and AGOURON
PHARMACEUTICALS, INC., a California corporation ("Agouron"), which parties
hereby agree as follows:

1.   AUTHORIZATION; COMMITMENT; CLOSING

     1.01      AUTHORIZATION.  The Company proposes to authorize, issue and sell
to Agouron on or before January 15, 2000, certain amounts of its common stock,
$.0025 par value ("Common Stock"), as described and determined below.

     1.02 COMMITMENT.  Subject to Paragraph 5.06 and the terms and conditions
hereof and on the basis of the representations and warranties hereinafter set
forth, the Company agrees to issue and sell to Agouron, and Agouron agree to
purchase from the Company as of the dates and for the consideration set forth
below, the number of shares of the Company's Common Stock as determined below. 
The Common Stock which Agouron is acquiring pursuant to the terms of this
Agreement is hereinafter referred to as "Restricted Common Stock".  Agouron is
hereinafter sometimes referred to as the "Purchaser."  The purchases of the
Common Stock shall occur on the seven purchase dates set forth below.  On each
purchase date, Agouron shall be entitled to acquire such number of shares of
Restricted Common Stock (rounded up to the nearest whole share) as may be
purchased for $2,000,000, at a purchase price equal to the stated premium set
forth opposite the applicable purchase date, over the then fair market value
("FMV") of the Common Stock on The NASDAQ Stock Market.  FMV shall be defined as
the average closing price of the Common Stock on The NASDAQ Stock Market for the
five (5) trading days immediately preceding the referenced purchase date.  In
the event the FMV is "***" on any purchase date, the premium applicable to such
purchase date shall be adjusted to "***."

<TABLE>
<CAPTION>

Purchase Date          Purchase Price                Premium Over FMV
- -------------          --------------                ----------------
<S>                    <C>                           <C>
June 11, 1998            $2,000,000                          50%
October 15, 1998         $2,000,000                          ***
January 15, 1999         $2,000,000                          ***
April 15, 1999           $2,000,000                          ***
July 15, 1999            $2,000,000                          ***
October 15, 1999         $2,000,000                          ***
January 15, 2000         $2,000,000                          ***
</TABLE>

     1.03      CLOSING.  Separate closings of the purchase and sale of the
Restricted Common Stock ("Closings") shall occur on each of the purchase dates
set forth above and shall take place at such time and place as the Company and
Purchaser shall agree.  At each Closing the Company shall deliver to Purchaser
the number of shares of Restricted Common Stock required by Paragraph 1.02,
above, upon delivery to the 


*** - Confidential treatment requested.  Sections of text which have been
omitted and for which confidential treatment is requested are noted with "***". 
An unredacted version of this document has been filed separately with the
Securities and Exchange Commission.


<PAGE>

Company by Purchaser of a certified check or wire transfer of funds in the
amount of $2,000,000.  The Restricted Common Stock to be delivered to Agouron
hereunder at each Closing will be evidenced by a single certificate registered
in Agouron's name or in the name of such nominee as Agouron may specify and,
when issued in accordance with the terms of this Agreement for the consideration
expressed herein, will be duly authorized, validly issued, fully paid,
nonassessable and free and clear of any liens or encumbrances caused or created
by the Company (except that such Restricted Common Stock of the Company will be
subject to restrictions on transfer under federal and applicable state
securities laws).

2.   REPRESENTATIONS

     2.01  REPRESENTATIONS OF THE COMPANY.  The Company represents and
warrants as follows:

           (a)  The Company is a corporation duly organized, validly
           existing and in good standing under the laws of the State of
           Delaware and has all requisite power and authority which are
           necessary to own and operate its business and properties and to
           carry on its business as it is being conducted.  The Company is
           duly licensed and qualified and in good standing in the State of
           California and in such other jurisdictions in which the ownership
           or lease of property or the conduct of its business makes such
           licensing or qualification necessary.
               
           (b)  There are no proceedings pending or, to the knowledge of the
           Company, threatened against or affecting the Company in any court
           or before any governmental authority or agency or arbitration
           board or tribunal which involve the possibility of materially and
           adversely affecting the properties, business, prospects or
           condition (financial or otherwise) of the Company.
           
           (c)  The issuance and sale of the Restricted Common Stock and
           compliance by the Company with all of the provisions of this
           Agreement are within the corporate powers of the Company and have
           been duly authorized by all proper corporate action on the part
           of the Company and will not (i) conflict with or result in any
           breach of any of the terms, conditions or provisions of, or
           constitute a default under the Articles of Incorporation of the
           Company or the Bylaws of the Company, (ii) conflict with or
           result in any breach of any of the terms, conditions or
           provisions of, or constitute a default under or give any party
           the right to terminate or accelerate performance under any other
           agreement or instrument to which the Company is a party (iii)
           require consent under any other contract to which the Company is
           a party, (iv) result in the creation or imposition of any lien,
           charge or encumbrance upon any property or assets of the Company
           pursuant to the terms of any other contract to which the Company
           is a party or (v) conflict with any provision of any applicable
           judgment, decree, order, statute, rule, or regulation of any
           court or any public, governmental or regulatory agency or body
           having jurisdiction over the Company.


                                     2


<PAGE>

           (d)  This Agreement is a valid and binding agreement of the
           Company and is enforceable against the Company in accordance with
           the terms hereof, except as such enforceability may be affected
           by applicable bankruptcy laws and equitable remedies.
               
           (e)  The authorized capital stock of the Company consists of
           5,000,000 shares of preferred stock (preferred stock) and
           40,000,000 shares of common stock.  As of the date hereof, 200
           shares of its Series F Convertible Preferred Stock are
           outstanding.  This preferred stock is convertible into common
           stock initially at a conversion price equivalent to $14.07 per
           share of common stock.  If the Company's common stock does not
           trade at prices higher than $14.07 per share over a period of
           time, the conversion price will be adjusted downward on April 24,
           1999 (or sooner if the Company issues common stock at less than
           $14.07 per share) and quarterly thereafter.  As of June 9, 1998,
           22,900,350 shares of voting common stock are outstanding.  As of
           the date hereof, 4,497,749 stock options issued pursuant to the
           Company's stock option plans and two (2) warrants to purchase a
           total of 2,051,281 shares of voting stock are outstanding.  Up to
           6,180,000 shares of common stock may be issued under the
           Company's stock option plans.  Except as set forth above, there
           are no other options, warrants, conversion privileges, preemptive
           rights, or  rights of first refusal granted by the Company in
           favor of any other person presently outstanding or in existence
           to purchase or acquire any of the authorized but unissued Common
           Stock of the Company, other than any of such items granted
           pursuant to this Agreement.  The Company has provided to
           Purchaser copies of its currently in effect Articles of
           Incorporation and Bylaws, its Form 10-K for the year ended
           December 31, 1997, its 1997 Annual Report, its Proxy statement
           dated April 27, 1998 and its Form 10-Q for the quarter ended
           March 31, 1998. The Company warrants that the information
           contained in such documents as updated and supplemented prior to
           the date of the Closing is true and correct and when taken as a
           whole does not omit a fact necessary to make the information
           contained therein in light of the circumstance under which the
           documents were made (taking into account, without limitation, the
           type of transaction contemplated by this Agreement and the
           sophistication and nature of the Purchaser), not misleading.  The
           Company acknowledges that the Purchaser is relying on the written
           documentation provided by the Company to Purchaser as described
           above in making its decision to purchase the Restricted Common
           Stock.
           
           (f)  Since March 31, 1998, except for the sale of 200 shares of
           Series F Convertible Preferred Stock for $10 million, there has
           not been any change in the assets, liabilities, financial
           condition or operations of the Company other than changes in the
           ordinary course of business, none of which individually or in the
           aggregate have had a material adverse affect on such assets,
           liabilities, financial condition or operations of the Company.
           

                                     3


<PAGE>

     2.02  REPRESENTATIONS OF THE PURCHASER.  The Purchaser represents and
warrants as follows:

     (a)  It is the intent of the Purchaser that its purchase of the
     Restricted Common Stock contemplated by this Agreement shall constitute a
     transaction exempt from registration under the Securities Act of 1933, as
     amended (the "Securities Act") and any applicable state securities laws.
     
     (b)  Purchaser will not offer or sell any Restricted Common Stock
     except pursuant to an effective registration statement under the Securities
     Act or in transactions which do not require registration under the
     Securities Act.
     
     (c)  Purchaser is a corporation duly organized and validly existing
     under the laws of the State of California is in good standing under such
     laws and has all requisite corporate powers and authority to enter into
     this Agreement.
     
     (d)  On or prior to the date of the initial Closing, Purchaser will
     have taken all action necessary for the authorization, execution, delivery
     and performance of this Agreement.
     
     (e)  Purchaser has (i) reviewed this Agreement, and the written
     statements, and documents, delivered to Purchaser as described in Section
     2.01(e); and, (ii) received satisfactory response from the Company as to
     matters about which Purchaser has inquired relating to this Agreement, and
     other documents described in Section 2.01(e) and relating to the Company's
     business condition, prospects and plans as necessary to evaluate the merits
     and risks of acquiring the Restricted Common Stock.  Purchaser has informed
     the Company that Purchaser is relying on all such information and documents
     in making its decision to purchase the Restricted Common Stock.
     
     (f)  Purchaser (i) has had the risks involved in the investment
     represented by this Agreement explained; (ii) has knowledge and experience
     in financial and business matters to evaluate the merits and risks of the
     investment represented by this Agreement; (iii) is able to bear the
     economic risk of the investment represented by this Agreement (including a
     complete loss of this investment); and (iv) has determined that this
     investment is suitable for Purchaser in light of Purchaser's financial
     circumstances and available investment opportunities.
     
     (g)  Purchaser is acquiring the Restricted Common Stock for its own
     account and with its general assets for the purpose of investment and not
     with a view to the resale, transfer or distribution thereof, and has no
     present intention of selling, transferring, negotiating or otherwise
     disposing of any Restricted Common Stock.  Notwithstanding anything in this
     Agreement to the contrary, it is agreed that the Purchaser shall have the
     right to assign or transfer the Restricted Common Stock to its Affiliates
     at any time without the consent of the Company.


                                     4


<PAGE>


3.   NON-DISCLOSURE.  Except as agreed to by the parties neither the Company nor
the Purchaser shall release any information to any third party with respect to
any of the terms of this Agreement without the prior written consent of the
other, which consent shall not unreasonably be withheld.  This prohibition
includes, but is not limited to, press releases, promotional materials and
discussions with the media.  If the Company determines that it is required by
law to release information to any third party regarding the terms of this
Agreement, it shall notify the Purchaser of this fact prior to releasing the
information.  The notice to the Purchaser shall include the text of the
information proposed for release.  The Purchaser shall have the right to confer
with the Company regarding the necessity for the disclosure and the text of the
information proposed for release.

4.   COMPLIANCE WITH SECURITIES ACT

     4.01  CERTAIN DEFINITIONS.  As used herein, the following terms shall
have the following respective meanings:

     (a)   COMMISSION.  Shall mean the Securities and Exchange Commission,
     or any other Federal agency at the time administering the Securities Act or
     the Trust Indenture Act, as the case may be.
     
     (b)   SECURITIES ACT.  Shall mean the Securities Act of 1933, as
     amended, or any similar Federal statute, and the rules and regulations of
     the Commission thereunder, all as the same shall be in effect at the
     relevant time.
     
     (c)   EXCHANGE ACT.  Shall mean the Securities Exchange Act of 1934, as
     amended, or any similar Federal statute, and the rules and regulations of
     the Commission thereunder, all as the same shall be in effect at the
     relevant time.
     
     (d)   RESTRICTED COMMON STOCK.  Shall mean the Common Stock of the
     Company issued and sold pursuant to this Agreement which by the terms
     hereof is required to bear the legend specified in Section 4.02 hereof.
                    
     4.02  RESTRICTION OF TRANSFERABILITY; LEGEND.  Shares of Restricted
Common Stock shall not be resold or transferred unless registered under the
Securities Act or unless an exemption from registration is available for such
sale or transfer.  The conditions specified below are intended to ensure
compliance with the provisions of the Securities Act in respect of any transfer
of stock.  Each certificate for shares of Restricted Common Stock shall be
stamped or otherwise imprinted with a legend in substantially the following
form:

                The shares evidenced by this certificate have not been
                registered under the Securities Act of 1933, as
                amended, and may not be sold or transferred in the
                absence of such registration or an exemption therefrom
                under said Securities Act and the transfer of such


                                     5


<PAGE>

                shares is subject to terms and conditions specified in
                the Common Stock Purchase Agreement dated as of June
                11, 1998, between the Company and Agouron
                Pharmaceuticals, Inc.
                    
If shares of Restricted Common Stock evidenced by certificates bearing a legend
required by this Section 4.02 are sold in accordance with a registration
statement which has become effective under the Securities Act, or if the Company
shall receive an opinion of its counsel to the effect that any legend required
under this Section 4.02 is not, or is no longer, necessary or required with
respect to such shares (including, without limitation, because of the
availability of the exemption afforded by Rule 144 of the General Rules and
Regulations of the Commission), the Company shall, or shall instruct its
transfer agent and registrar to, remove such legend or issue new certificates
without such legend in lieu thereof.

     4.03  INFORMATION REQUIREMENTS.  The Company agrees to:

           (a)   Make and keep public information available, as such term is
           understood and defined in Commission Rule 144 and Rule 144A, under 
           the Securities Act;
     
           (b)   Use its best efforts to file with the Commission in a timely
           manner all reports and other documents required of the Company 
           under the Securities Act and the Exchange Act; and
     
           (c)   Furnish to any holder of Restricted Common Stock a copy of the
           most recent annual or quarterly report of the Company, and such other
           publicly available reports and documents of the Company, so that such
           holder may avail itself of any rule or regulation of the Commission
           allowing it to sell any such securities without registration.

     4.04  PIGGY-BACK REGISTRATION RIGHTS.  If the Company before January
15, 2001 contemplates a public offering of shares of its Common Stock to be
registered under the Securities Act, the Company shall so notify the Purchaser
in writing of its intention to do so, at least twenty (20) days prior to the
filing of a registration statement for such offering.  If Purchaser gives
written notice to the Company, within ten (10) days of receipt of the notice
from the Company, of Purchaser's desire to have its Restricted Common Stock
included in such registration statement,  Purchaser may, subject to the
provisions of this Section 4.04, have its Restricted Common Stock included in
such registration statement.  The Company shall bear all expenses in connection
with the registration and sale of any such Restricted Common Stock, other than
the fees or disbursements of any special counsel which the Purchaser may retain
in connection with the registration of its Restricted Common Stock or any
portion of the underwriter's commission, discounts and expenses attributable to
the Restricted Common Stock being offered and sold by the Purchaser. 
Notwithstanding the foregoing, if the managing underwriter of any such offering
determines that the number of shares proposed to be sold by the Company, by
other shareholders having piggy-back rights, and/or by the Purchaser is greater
than the number of shares which the underwriter believes feasible to sell at the
time, at the price and upon the terms approved by the Company, then the 


                                     6


<PAGE>


number of shares which the underwriter believes may be sold shall be 
allocated for inclusion in the registration statement in the following order 
of priority:  (i) shares being offered by the Company; and (ii) pro rata 
among the other shareholders and the Purchaser, based on the number of shares 
of Common Stock each shareholder requested to be registered.  The Company 
shall have the right to designate the managing underwriter in respect of a 
public offering pursuant to this Section 4.04.

     4.05  ADDITIONAL COVENANTS CONCERNING SALE OF SHARES.

          (a)   The Company will notify the Purchaser of the effectiveness of 
          any registration statement in which Purchaser has exercised 
          registration rights granted pursuant to the terms of Section 4.04,
          together with a list of the jurisdictions where the Company has 
          qualified or is exempt from registration under applicable state
          securities laws.
               
          (b)   The Company will prepare and file with the Commission such
          amendments and supplements to any registration statement filed 
          pursuant to the terms of Section 4.04 (and any prospectus used in 
          connection with such registration statement) as may be necessary to 
          comply with the provisions of the Securities Act with respect to the 
          sale of Restricted Common Stock by the Purchaser.
               
          (c)   The Company will furnish to the Purchaser a reasonable number 
          of copies of the prospectus used in connection with a registration 
          statement filed pursuant to the terms of Section 4.04, including a 
          preliminary prospectus, which prospectus conforms to the requirements
          of the Securities Act, and such other documents as the Purchaser may 
          reasonably request, in order to facilitate the disposition of the 
          Purchaser's Restricted Common Stock.
               
          (d)   In connection with any registration statement referred to in
          Section 4.04 of this Agreement,  Purchaser will furnish to the 
          Company such information as the Company may reasonably require 
          from Purchaser for inclusion in the registration statement (and 
          the prospectus included therein).
               
          (e)   The Company's obligations under Section 4.04 shall be 
          conditioned upon Purchaser executing and delivering to the 
          Company its agreement, in a form satisfactory to counsel for 
          the Company, that it will comply with all applicable provisions
          of the Securities Act, the Exchange Act, the securities acts
          of applicable states and any rules and regulations promulgated
          under such acts and will furnish to the Company information
          about sales made in such public offering.

     4.06  INDEMNIFICATION

     In the event any of the Restricted Common Stock of Purchaser is included in
a registration statement under Section 4.04 of this Agreement:


                                     7


<PAGE>

     (a)  To the extent permitted by law, the Company will indemnify and
     hold harmless the Purchaser and its Affiliates and their respective
     officers, directors and employees, against any losses, claims, damages, or
     liabilities (joint or several) to which they may become subject under the
     Securities Act, the Exchange Act or other federal or state law, insofar as
     such losses, claims, damages, or liabilities (or actions in respect
     thereof) arise out of or are based upon any of the following statements,
     omissions or violations (hereinafter sometimes collectively referred to as
     a "Violation(s)"):  (i) any untrue statement or alleged untrue statement of
     a material fact contained in such registration statement, including any
     preliminary prospectus or final prospectus contained therein or any
     amendments or supplements thereto; (ii) the omission or alleged omission to
     state therein a material fact required to be stated therein, or necessary
     to make the statements therein not misleading; or (iii) any violation or
     alleged violation by the Company of the Securities Act, the Exchange Act,
     any state securities law or any rule or regulation promulgated under the
     Securities Act, the Exchange Act or any state securities law; and the
     Company will reimburse each such indemnified party for any legal or other
     expenses reasonably incurred by it in connection with investigating or
     defending any such loss, claim, damage, liability or action; provided,
     however, that the indemnity agreement contained in this Section 4.06 shall
     not apply to amounts paid in settlement of any such loss, claim, damage,
     liability or action if such settlement is effected without the consent of
     the Company (which consent shall not be unreasonably withheld or delayed),
     nor shall the Company be liable in any such case for any such loss, claim,
     damage, liability or action to the extent that it arises out of or is based
     upon a Violation which occurs in reliance upon, and in conformity with,
     written information furnished expressly for use in connection with such
     registration, by any such indemnified party.

     (b)  To the extent permitted by law, the Purchaser will indemnify and
     hold harmless the Company and its Affiliates and their respective officers,
     directors and employees against any losses, claims, damages, or liabilities
     (joint or several) to which they may become subject under the Securities
     Act, the Exchange Act or other federal or state law, insofar as such
     losses, claims, damages, or liabilities (or actions in respect thereof)
     arise out of or are based upon any Violations, in each case to the extent
     (and only to the extent) that such Violation occurs in reliance upon, and
     in conformity with, written information furnished by the Purchaser and its
     Affiliates and their respective officers, directors and employees to the
     Company expressly for use in connection with such registration; and the
     Purchaser will reimburse each such indemnified party for any legal or other
     expenses reasonably incurred by it in connection with investigating or
     defending any such loss, claim, damage, liability or action; provided,
     however, that the indemnity agreement contained in this Section 4.06 shall
     not apply to amounts paid in settlement of any such loss, claim, damage,
     liability or action if such settlement is effected without the consent of
     the Purchaser, which consent shall not be unreasonably withheld or delayed.


                                     8


<PAGE>

     (c)  Promptly after receipt by an indemnified party under this Section
     4.06 of notice of the commencement of any action (including any
     governmental action), such indemnified party will, if a claim in respect
     thereof is to be made against the indemnifying party under this Section
     4.06, notify the indemnifying party in writing of the commencement thereof
     and the indemnifying party shall have the right to participate in, and, to
     the extent the indemnifying party so desires, to assume the defense thereof
     with counsel mutually satisfactory to the parties.

5. MISCELLANEOUS

     5.01  EXPENSES; FINDERS FEES.  Neither party shall pay expenses and
finder fees for or to the other in connection with this transaction.  Each party
agrees to indemnify and hold the other party harmless from any liability for any
commission or compensation in the nature of a finder's fee to any broker or
other person (and the costs and expenses of defending against such liability or
asserted liability) claiming to have been hired or engaged by the party.

     5.02  REPLACEMENT OF CERTIFICATES FOR RESTRICTED COMMON STOCK.  Upon
receipt by the Company of evidence reasonably satisfactory to it of the loss,
theft, destruction or mutilation of any certificate evidencing any Restricted
Common Stock, the Company will execute, register and deliver, in lieu thereof, a
new certificate for an equal number of shares of Restricted Common Stock.  In
the case of loss, theft or destruction of a certificate, at the election of the
Company, the Purchaser may be required to provide an indemnity reasonably
satisfactory to the Company or to post a surety bond in an amount equal to the
value of the shares represented by the new certificate.

     5.03  NOTICE.  Any notice required to be given under the terms of this
Agreement shall be in writing, and shall be given in person, transmitted by
telecopier, e-mail or similar electronic communication, delivered by a
recognized overnight delivery service such as Federal Express or sent by mail
(certified or registered or air mail for addresses outside of the country of
origin), return receipt requested, postage prepaid and addressed to the Company
at 5935 Darwin Court, Carlsbad, California 92008, or such other address as the
Company may designate to Purchaser in writing and to the Purchaser, at the
address appearing at the beginning of this Agreement or such other address as
Purchaser may designate to the Company in writing.  Except as otherwise provided
herein, any notice so given shall be deemed delivered upon the earlier of (i)
actual receipt; (ii) receipt by sender of confirmation if telecopied or sent by
e-mail or similar electronic communication; (iii) two business days after
delivery to such overnight delivery service; or (iv) five business days after
deposit in the mail.

     5.04  SUCCESSORS AND ASSIGNS.  This Agreement shall be binding upon the
parties and their respective successors and assigns.

     5.05  SURVIVAL OF REPRESENTATIONS, ETC.  All covenants, representations
and warranties made by the parties herein shall survive the Closings and the
delivery of this Agreement and the shares of Restricted Common Stock purchased
hereunder.


                                  9


<PAGE>

     5.06  TERMINATION.  Purchaser's obligation to purchase Restricted
Common Stock under this Agreement shall terminate with respect to any purchase
obligations whose purchase dates under Paragraph 1.02 occur after Purchaser has
elected to terminate, in its entirety, all of Purchaser's rights and obligations
under the Letter of Intent ("LOI") dated June 11, 1998 and the Definitive
Agreement (as defined in the LOI) between the parties.

     5.07  SEVERABILITY.  Should any part of this Agreement for any reason
be declared invalid, such decision shall not affect the validity of any
remaining portion, which remaining portion shall remain in force and effect as
if this Agreement had been executed with the invalid portion thereof eliminated
and it is hereby declared the intention of the parties hereto that they would
have executed the remaining portion of this Agreement without including therein
any such part, parts, or portion which may, for any reason, be hereafter
declared invalid.

     5.08  GOVERNING LAW.  This Agreement shall be construed and enforced in
accordance with, and governed by, the laws of the State of California without
regard to its conflict of law provisions.

     5.09  CAPTIONS, FORM OF PRONOUNS.  The descriptive headings of the
various sections or parts of this Agreement are for convenience only and shall
not affect the meaning or construction of any of the provisions hereof.  All
pronouns used in this Agreement shall be deemed to include masculine, feminine
and neuter forms.

     5.10  AGREEMENT IS ENTIRE CONTRACT.  This Agreement constitutes the
entire contract between the parties hereto related to the purchase and sale of
Restricted Common Stock and no party shall be liable or bound to the other in
any manner by any warranties, representations or covenants except as
specifically set forth herein.

     5.11  THIRD PARTIES.  Nothing in this Agreement is intended to confer
upon any party, other than the parties hereto, and their respective permitted
successors and assigns, any rights, remedies, obligations, or liabilities under
or by reason of this Agreement, except as expressly provided herein.

     5.12  AMENDMENT AND WAIVER.  Any provision of this Agreement may be
amended and the observance of any term hereof may be waived (either
prospectively or retroactively and either generally or in a particular instance)
only with the written consent of the Company and the Purchaser.

     5.13  AFFILIATES.  References to Purchaser in this Agreement shall be
deemed to include direct or indirect subsidiaries of Purchaser.  The term
"Affiliate" shall have the meaning defined in the LOI.

     5.14  DISPUTE RESOLUTION.  In the event of any controversy or claim arising
out of or relating to any provision of this Agreement, the parties shall try to
settle their differences amicably between themselves.  Any unresolved disputes
arising between the parties relating to, arising out of or in any way connected
with this Agreement or any term or condition hereof, or the performance by
either party of its obligations hereunder, whether before or after termination
of this Agreement, shall be finally resolved by binding


                            10


<PAGE>

arbitration.  Whenever a party shall decide to institute arbitration 
proceedings, it shall give written notice to that effect to the other party.  
The party giving such notice shall refrain from instituting the arbitration 
proceedings for a period of sixty (60) days following such notice  The 
arbitration shall be held in San Diego, California according to the rules of 
the American Arbitration Association ("AAA") applicable to commercial 
securities matters of this nature.  The arbitration shall be conducted by a 
panel of three arbitrators appointed in accordance with AAA rules; provided, 
however, that each party shall within thirty (30) days after the institution 
of the arbitration proceedings appoint one arbitrator with the third 
arbitrator being chosen by the other two arbitrators.  If only one party 
appoints an arbitrator, then such arbitrator shall be entitled to act as the 
sole arbitrator to resolve the controversy.  Any arbitration hereunder shall 
be conducted in the English language and the arbitrator(s) shall apply the 
law set forth in Section 5.08.  All arbitrator(s) eligible to conduct the 
arbitration must agree to render their opinion(s) within thirty (30) days of 
the final arbitration hearing.  The arbitrator(s) shall have the authority to 
grant injunctive relief and specific performance, and to allocate between the 
parties the costs of arbitration in such equitable manner as he determines; 
provided, however, that each party shall bear its own costs and attorney's 
and witness' fees.  Notwithstanding the terms of this Section 5.14, a party 
shall also have the right to obtain prior to the arbitrator(s) rendering the 
arbitration decision, provisional remedies including injunctive relief or 
specific performance from a court having jurisdiction thereof.  The 
arbitrator(s) will, upon the request of either party, issue a written opinion 
of the findings of fact and conclusions of law and shall deliver a copy to 
each of the parties.  Decisions of the arbitrator(s) shall be final and 
binding on all of the parties.  Judgment on the award so rendered may be 
entered in any court having jurisdiction thereof. 


                                 11


<PAGE>

     The execution hereof by Purchaser shall constitute a contract between us
for the uses and purposes hereinabove set forth, and this Agreement may be
executed in any number of counterparts, each executed counterpart constituting
an original but all together only one agreement.

                                       THE IMMUNE RESPONSE CORPORATION
                                        
                                        By  s/Dennis J. Carlo
                                            ---------------------------------
                                        
                                        By  s/Charles J.Cashion
                                            ---------------------------------

ACCEPTED AND AGREED TO AS OF THE DAY AND YEAR AFORESAID.
                                        
                                        PURCHASER:
                                        AGOURON PHARMACEUTICALS, INC
                                        
                                        
                                        By  s/Peter Johnson
                                            ---------------------------------
                                        Peter Johnson
                                        President and Chief Executive Officer
                                        
                                        
                                        By  s/Gary Friedman
                                            ---------------------------------
                                        Gary Friedman
                                        Secretary





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