IMMUNE RESPONSE CORP
S-3/A, 1999-08-20
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON AUGUST 20, 1999.
                                                      REGISTRATION NO. 333-83195
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                           --------------------------

                                AMENDMENT NO. 1

                                       TO

                                    FORM S-3

                             REGISTRATION STATEMENT

                                     UNDER

                           THE SECURITIES ACT OF 1933
                           --------------------------

                        THE IMMUNE RESPONSE CORPORATION

             (Exact name of registrant as specified in its charter)

<TABLE>
<S>                              <C>
           DELAWARE                 33-0255679
 (State or other jurisdiction    (I.R.S. Employer
     of incorporation or          Identification
        organization)                  No.)
</TABLE>

                               5935 DARWIN COURT
                           CARLSBAD, CALIFORNIA 92008
                                 (760) 431-7080
         (Address, including zip code, and telephone number, including
             area code of registrant's principal executive offices)
                           --------------------------

                                                        COPIES TO:
        DENNIS J. CARLO, PH.D.                 THOMAS E. SPARKS, JR., ESQ.
President and Chief Executive Officer             JOHN L. DONAHUE, ESQ.
   The Immune Response Corporation                 ALAN G. SMITH, ESQ.
          5935 Darwin Court                   Pillsbury Madison & Sutro LLP
      Carlsbad, California 92008                      P. O. Box 7880
            (760) 431-7080                     San Francisco, CA 94120-7880
 (Name, address, including zip code,                  (415) 983-1000
        and telephone number,
  including area code, of agent for
               service)

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

        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
  From time to time after the effective date of this Registration Statement as
                     determined by the Selling Stockholder.

    If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box: / /

    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, please check the following box: /X/

    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering: / /

    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering: / /

    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box: / /
                           --------------------------

                        CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
                                                                   PROPOSED MAXIMUM    PROPOSED MAXIMUM       AMOUNT OF
           TITLE OF EACH CLASS OF                 AMOUNT TO         OFFERING PRICE        AGGREGATE          REGISTRATION
        SECURITIES TO BE REGISTERED             BE REGISTERED        PER SHARE(1)       OFFERING PRICE          FEE(2)
<S>                                           <C>                 <C>                 <C>                 <C>
Common Stock, $.0025 par value..............   4,000,000 shares         $5.531           $22,124,000          $6,150.47
</TABLE>

(1) Estimated solely for the purpose of calculating the registration fee
    pursuant to Rule 457(c), based upon the average of the high and low price
    reported on the Nasdaq National Market on July 14, 1999.

(2) Previously paid.
                           --------------------------

THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR DATES
AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL FILE
A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION STATEMENT
SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF THE
SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.

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

                        THE IMMUNE RESPONSE CORPORATION
                        4,000,000 SHARES OF COMMON STOCK

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

    This prospectus is part of a registration statement we filed with the
Securities and Exchange Commission using a "shelf" registration process. This
means:

    - We may issue up to 4,000,000 shares of our common stock from time to time.

    - We will circulate a prospectus supplement each time we plan to issue our
      common stock.

    - The prospectus supplement will inform you about the specific terms of that
      offering and also may add, update or change information contained in this
      prospectus.

    - You should read this prospectus and any prospectus supplement carefully
      before you invest.

    Our common stock is listed on the Nasdaq National Market under the symbol
"IMNR." On August 19, 1999, the last reported sale price for our common stock on
the Nasdaq National Market was $5.8125 per share.

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

INVESTING IN OUR COMMON STOCK INVOLVES RISKS. SEE "RISK FACTORS" BEGINNING ON
PAGE 2.

    NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED THESE SECURITIES OR PASSED UPON THE
ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL
OFFENSE.

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

                 The date of this Prospectus is August 20, 1999
<PAGE>
                                  RISK FACTORS

    YOU SHOULD CAREFULLY CONSIDER THE RISKS DESCRIBED BELOW BEFORE MAKING AN
INVESTMENT DECISION. THE RISKS AND UNCERTAINTIES DESCRIBED BELOW ARE NOT THE
ONLY ONES FACING US. ADDITIONAL RISKS AND UNCERTAINTIES NOT PRESENTLY KNOWN TO
US OR THAT WE CURRENTLY DEEM IMMATERIAL MAY ALSO IMPAIR OUR BUSINESS.

    IF ANY OF THE FOLLOWING RISKS ACTUALLY OCCUR, OUR BUSINESS COULD BE
ADVERSELY AFFECTED. IN THOSE CASES, THE TRADING PRICE OF OUR COMMON STOCK COULD
DECLINE, AND YOU MAY LOSE ALL OR PART OF YOUR INVESTMENT.

THE FAILURE TO SUCCESSFULLY DEVELOP AND COMMERCIALIZE PRODUCTS MAY CAUSE US TO
CEASE OPERATIONS.

    We have not completed the development of any products. A failure to
successfully develop and commercialize products may cause us to cease
operations. Our potential therapies under development will require significant
additional research and development efforts and regulatory approvals prior to
potential commercialization.

    The conclusion of the Phase III trial of REMUNE due to lack of efficacy has
had a material adverse effect on us. If Agouron Pharmaceuticals, Inc. fails to
initiate or successfully complete additional pivotal trials with REMUNE we may
have to abandon REMUNE or seek additional funding.

    Our other therapies and technologies are at earlier stages of development
than REMUNE. Some of our technologies have not yet been tested in humans. Human
testing of potential products based on these technologies may not be permitted
by regulatory authorities. Even if human testing is permitted, the products
based on these technologies may not be successfully developed or be shown to be
safe and efficacious. Potential immune-based therapies based on some of our
technologies are at an early stage of clinical testing and may not be shown to
be safe or efficacious or ever receive regulatory approval.

    The results of our preclinical studies and clinical trials may not be
indicative of future clinical trial results. A commitment of substantial
resources to conduct time-consuming research, preclinical studies and clinical
trials will be required if we are to develop any products. Delays in planned
patient enrollment in our clinical trials may result in increased costs, program
delays or both. None of our potential products may prove to be safe and
effective in clinical trials. FDA or other regulatory approvals may not be
obtained and even if successfully developed and approved, our products may not
achieve market acceptance. Any products resulting from our programs are not
expected to be successfully developed or commercially available for a number of
years, if at all.

    Unacceptable toxicities or side effects may occur at any time in the course
of human clinical trials or, if any products are successfully developed and
approved for marketing, during commercial use of our products. The appearance of
any unacceptable toxicities or side effects could interrupt, limit, delay or
abort the development of any of our products or, if previously approved,
necessitate their withdrawal from the market.

OUR ADDITIONAL FINANCING REQUIREMENTS AND LIMITED ACCESS TO FINANCING MAY
ADVERSELY AFFECT OUR ABILITY TO DEVELOP PRODUCTS

    We will need to raise additional funds to conduct research and development,
preclinical studies and clinical trials necessary to bring our potential
products to market and establish manufacturing and marketing capabilities. A
failure to raise additional funds would require us to scale back or eliminate
some or all of our research and development programs or license to third parties
products or technologies that we would otherwise seek to develop ourselves. We
believe that our existing resources, will enable us to maintain our current and
planned operations only into early 2000.

    We anticipate that in 1999, the REMUNE clinical trials will continue to
represent a significant portion of our overall expenditures. We also anticipate
that costs related to the development of REMUNE will decrease in 2000. In
particular, we anticipate additional capital improvements of approximately $4
million to be made during 1999 related to increasing the capacity of our
manufacturing facility. Other anticipated

                                       2
<PAGE>
costs with respect to REMUNE will depend on many factors, in particular the
continuation of our collaboration with Agouron Pharmaceuticals, Inc.

    Our future capital requirements will depend on many factors, including:

    - continued scientific progress in our research and development programs,

    - the scope and results of preclinical studies and clinical trials, the time
      and costs involved in obtaining regulatory approvals,

    - the costs involved in filing, prosecuting and enforcing patent claims,

    - competing technological and market developments,

    - the cost of manufacturing scale-up,

    - effective commercialization activities and arrangements, and

    - other factors not within our control.

    We intend to seek additional funding through public or private financings,
arrangements with corporate collaborators or other sources. If funds are
acquired through additional collaborations, we will likely be required to
relinquish some or all of the rights to products that we may have otherwise
developed ourselves. If adequate funds are not available when needed or on terms
acceptable to us, we may be required to scale back some or all of our research
and development programs or license to third parties products or technologies
that we would otherwise seek to develop ourselves.

IF AGOURON PHARMACEUTICALS, INC. TERMINATES ITS COLLABORATION WITH US WE MAY
HAVE TO ABANDON REMUNE OR SEEK ADDITIONAL FUNDING

    Our binding Letter of Intent with Agouron Pharmaceuticals, Inc. is the
primary collaborative agreement that provides us with contract revenue. The
termination of our agreement with Agouron might require us to abandon REMUNE or
seek additional Funding. Agouron has been acquired by Warner Lambert Company. We
do not know which Agouron research products Warner Lambert Company will continue
to fund in the future.

WE MAY NOT BE ABLE TO ENTER INTO ADDITIONAL COLLABORATIONS

    We intend to seek additional collaborative arrangements to develop and
commercialize our products. We may not be able to negotiate collaborative
arrangements on favorable terms, or at all, in the future and our current or
future collaborative arrangements may not be successful. This may cause us to
abandon some of our products under development.

OUR PATENTS AND PROPRIETARY TECHNOLOGY MAY NOT PROVIDE US WITH ANY BENEFIT AND
THE PATENTS AND PROPRIETARY TECHNOLOGY OF OTHERS MAY PREVENT US FROM
COMMERCIALIZING PRODUCTS

    A failure to obtain meaningful patent protection for our potential products
and processes would greatly diminish the value of our potential products and
processes.

    In addition, whether or not our patents are issued, or issued with limited
coverage, others may receive patents which contain claims applicable to our
products. We are aware that a group working with Connetics Corporation has
received a United States patent related to autoimmune disease research that
covers technology similar to that used by us. We are also aware that AstraZeneca
PLC has acquired the rights to a patent, which has been issued in Europe and
other countries, that may interfere with our ability to develop some of our
technologies related to autoimmune disease if the patent is upheld after current
opposition proceedings. These patents, and others that we are not aware of, may
adversely affect our ability to develop and commercialize products.

                                       3
<PAGE>
    The patent positions of biotechnology and pharmaceutical companies can be
highly uncertain, and involve complex legal and factual questions. Therefore,
the breadth of claims allowed in biotechnology and pharmaceutical patents cannot
be predicted. We also rely upon unpatented trade secrets and know how, and
others may independently develop substantially equivalent trade secrets or know
how.

    We also rely on protecting our proprietary technology in part through
confidentiality agreements with our corporate collaborators, employees,
consultants and certain contractors. These agreements may be breached and we may
not have adequate remedies for any breach. In addition, our trade secrets may
otherwise become known or independently discovered by our competitors.

    Our products and processes may infringe, or be found to infringe, patents
not owned or controlled by us, such as the patent owned by Connetics Corporation
and AstraZeneca PLC. If relevant claims of third-party patents are upheld as
valid and enforceable, we could be prevented from practicing the subject matter
claimed in the patents, or would be required to obtain licenses to redesign our
products or processes to avoid infringement. Licenses may not be available at
all or on terms commercially reasonable to us and we may not be able to redesign
our products or processes to avoid infringement.

    Litigation may be necessary to defend against claims of infringement, to
enforce patents issued to us or to protect trade secrets. Litigation could
result in substantial costs and diversion of management efforts regardless of
the results of the litigation. An adverse result in litigation could subject us
to significant liabilities to third parties, require disputed rights to be
licensed or require us to cease using some technology.

OUR HISTORY OF OPERATING LOSSES AND OUR EXPECTATIONS OF CONTINUING LOSSES MAY
HURT OUR ABILITY TO CONTINUE OPERATIONS

    As of March 31, 1999, we had a consolidated accumulated deficit of $172.9
million. We have not generated revenues from the commercialization of any
product. We expect to incur substantial net operating losses over the next
several years which may imperil our ability to continue operations. We may not
be able to generate sufficient product revenue to become profitable at all or on
a sustained basis.

THE LENGTHY APPROVAL PROCESS AND UNCERTAINTY OF GOVERNMENT REGULATORY
REQUIREMENTS MAY DELAY OR PREVENT US FROM COMMERCIALIZING PRODUCTS

    Clinical testing, manufacture, promotion and sale of our products are
subject to extensive regulation by numerous governmental authorities in the
United States, principally the FDA, and corresponding state and foreign
regulatory agencies. This regulation may delay or prevent us from
commercializing products. Noncompliance with applicable requirements can result
in, among other things, fines, injunctions, seizure of products, total or
partial suspension of product marketing, failure of the government to grant
premarket approval, withdrawal of marketing approvals and criminal prosecution.

    The regulatory process for new therapeutic drug products, including the
required preclinical studies and clinical testing, is lengthy and expensive. We
may not receive necessary FDA clearances for any of our potential products in a
timely manner, or at all. The length of the clinical trial process and the
number of patients the FDA will require to be enrolled in the clinical trials in
order to establish the safety and efficacy of our products is uncertain.

    Even if additional pivotal surrogate marker trials of REMUNE are
successfully completed, the FDA may not approve REMUNE for commercial sale. We
may encounter significant delays or excessive costs in our efforts to secure
necessary approvals. Regulatory requirements are evolving and uncertain. Future
United States or foreign legislative or administrative acts could also prevent
or delay regulatory approval of our products. We may not be able to obtain the
necessary approvals for clinical trials, manufacturing or marketing of any of
our products under development. Even if commercial regulatory approvals are
obtained, they may include significant limitations on the indicated uses for
which a product may be marketed.

                                       4
<PAGE>
    In addition, a marketed product is subject to continual FDA review. Later
discovery of previously unknown problems or failure to comply with the
applicable regulatory requirements may result in restrictions on the marketing
of a product or withdrawal of the product from the market, as well as possible
civil or criminal sanctions.

    Among the other requirements for regulatory approval is the requirement that
prospective manufacturers conform to the FDA's Good Manufacturing Practices
("GMP") requirements specifically for biological drugs, as well as for other
drugs. In complying with the FDA's GMP requirements, manufacturers must continue
to expend time, money and effort in production, recordkeeping and quality
control to assure that the product meets applicable specifications and other
requirements. Failure to comply with the FDA's GMP requirements subjects the
manufacturer to possible FDA regulatory action. We or our contract
manufacturers, if any, may not be able to maintain compliance with the FDA's GMP
requirements on a continuing basis. Failure to maintain compliance could have a
material adverse effect on us.

    The FDA has not designated expanded access protocols for REMUNE as
"treatment" protocols. The FDA may not determine that REMUNE meets all of the
FDA's criteria for use of an investigational drug for treatment use. Even if
REMUNE is allowed for treatment use, third party payers may not provide
reimbursement for the costs of treatment with REMUNE.

    The FDA may not consider REMUNE or any other of the Company's products under
development to be an appropriate candidate for accelerated approval, expedited
review or fast track designation.

    To market any drug products outside of the United States, we are also
subject to numerous and varying foreign regulatory requirements, implemented by
foreign health authorities, governing the design and conduct of human clinical
trials and marketing approval. The approval procedure varies among countries and
can involve additional testing, and the time required to obtain approval may
differ from that required to obtain FDA approval. The foreign regulatory
approval process includes all of the risks associated with obtaining FDA
approval set forth above, and approval by the FDA does not ensure approval by
the health authorities of any other country.

TECHNOLOGICAL CHANGE AND COMPETITION MAY RENDER OUR POTENTIAL PRODUCTS OBSOLETE

    The biotechnology industry continues to undergo rapid change and competition
is intense and is expected to increase. Competitors may succeed in developing
technologies and products that are more effective or affordable than any which
are being developed by us or which would render our technology and products
obsolete and noncompetitive. Many of our competitors have substantially greater
experience, financial and technical resources and production, marketing and
development capabilities than us. Accordingly, some of our competitors may
succeed in obtaining regulatory approval for products more rapidly or
effectively than us.

OUR LACK OF COMMERCIAL MANUFACTURING AND MARKETING EXPERIENCE MAY PREVENT US
FROM SUCCESSFULLY COMMERCIALIZING PRODUCTS

    We have not manufactured our product candidates in commercial quantities. We
may not successfully make the transition from manufacturing clinical trial
quantities to commercial production quantities or be able to arrange for
contract manufacturing and this could prevent us from commercializing products.
Even if REMUNE is successfully developed and receives FDA approval, we have not
demonstrated the capability to manufacture REMUNE in commercial quantities.
Except for REMUNE, we have not demonstrated the ability to manufacture our
treatments in large-scale clinical or commercial quantities.

    We have no experience in the sales, marketing and distribution of
pharmaceutical products. Thus, our products may not be successfully
commercialized even if they are developed and approved for commercialization.

    The manufacturing of our products involves a number of steps and requires
compliance with stringent quality control specifications imposed by us and by
the FDA. Moreover, our products can only be

                                       5
<PAGE>
manufactured in a facility that has undergone a satisfactory inspection by the
FDA. For these reasons, we would not be able quickly to replace our
manufacturing capacity if we were unable to use our manufacturing facilities as
a result of a fire, natural disaster (including an earthquake), equipment
failure or other difficulty, or if such facilities are deemed not in compliance
with the FDA's GMP requirements and the non-compliance could not be rapidly
rectified. Our inability or reduced capacity to manufacture our products would
prevent us from successfully commercializing products.

    We may enter into arrangements with contract manufacturing companies to
expand our own production capacity in order to meet requirements for our
products, or to attempt to improve manufacturing efficiency. If we choose to
contract for manufacturing services and encounters delays or difficulties in
establishing relationships with manufacturers to produce, package and distribute
our finished products, clinical trials, market introduction and subsequent sales
of the products would be delayed. Further, contract manufacturers must also
operate in compliance with the FDA's GMP requirements; failure to do so could
result in, among other things, the disruption of product supplies. Our potential
dependence upon third parties for the manufacture of our products may adversely
affect our profit margins and our ability to develop and deliver products on a
timely and competitive basis.

ADVERSE DETERMINATIONS CONCERNING PRODUCT PRICING, REIMBURSEMENT AND RELATED
MATTERS COULD PREVENT US FROM SUCCESSFULLY COMMERCIALIZING PRODUCTS

    Our ability to earn sufficient returns on our products will depend in part
on the extent to which reimbursement for the costs of the products and related
treatments will be available from government health administration authorities,
private health coverage insurers, managed care organizations and other
organizations. Failure to obtain appropriate reimbursement could prevent us from
successfully commercializing products. Third party payors are increasingly
challenging the price of medical products and services. If purchasers or users
of our products are not able to obtain adequate reimbursement for the cost of
using the products, they may forego or reduce their use. Significant uncertainty
exists as to the reimbursement status of newly approved health care products,
and whether adequate third party coverage will be available.

PRODUCT LIABILITY EXPOSURE MAY EXPOSE US TO SIGNIFICANT LIABILITY

    We face an inherent business risk of exposure to product liability and other
claims in the event that the development or use of our technology or prospective
products is alleged to have resulted in adverse effects. We may not avoid
significant liability exposure. We may not have sufficient insurance coverage
and we may not be able to obtain sufficient coverage, at a reasonable cost. An
inability to obtain product liability insurance at acceptable cost or to
otherwise protect against potential product liability claims could prevent or
inhibit the commercialization of products developed by us. A product liability
claim could hurt our financial performance.

HAZARDOUS MATERIALS/ENVIRONMENTAL MATTERS COULD EXPOSE US TO SIGNIFICANT COSTS

    Although we do not currently manufacture commercial quantities of our
product candidates, we produce limited quantities of these products for our
clinical trials. We may be required to incur significant costs to comply with
current or future environmental laws and regulations. Our research and
development processes involve the controlled storage, use and disposal of
hazardous materials, biological hazardous materials and radioactive compounds.
We are subject to federal, state and local laws and regulations governing the
use, manufacture, storage, handling and disposal of these materials and some
waste products. Although we believe that our safety procedures for handling and
disposing of these materials comply with the standards prescribed by these laws
and regulations, the risk of accidental contamination or injury from these
materials cannot be completely eliminated. In the event of an accident, we could
be held liable for any damages that result, and any liability could exceed our
resources. Our operations, business or assets may be materially and adversely
affected by current or future environmental laws or regulations.

                                       6
<PAGE>
SUBORDINATION OF COMMON STOCK TO PREFERRED STOCK COULD HURT COMMON STOCKHOLDERS

    Our common stock is expressly subordinate to our Series F Convertible
Preferred Stock in the event of our liquidation, dissolution or winding up. If
we were to cease operations and liquidate our assets, there may not be any
remaining value available for distribution to the holders of common stock after
providing for the Series F Convertible Preferred Stock liquidation preference.

VOLATILITY OF STOCK PRICE AND ABSENCE OF DIVIDENDS MAY HURT COMMON STOCKHOLDERS

    The market price of our common stock, like that of the common stock of many
other biopharmaceutical companies, has been and is likely to be highly volatile.
Factors such as:

    - the results of preclinical studies and clinical trials by us, our
      collaborators or our competitors,

    - other evidence of the safety or efficacy of our products or our
      competitors,

    - announcements of technological innovations or new products by us or our
      competitors,

    - governmental regulatory actions,

    - changes or announcements in reimbursement policies,

    - developments with our collaborators,

    - developments concerning patent or other proprietary rights of ours or our
      competitors (including litigation),

    - concern as to the safety of our products,

    - period-to-period fluctuations in our operating results,

    - changes in estimates of our performance by securities analysts,

    - market conditions for biopharmaceutical stocks in general, and

    - other factors not within our control

could have a significant adverse impact on the market price of our common stock.
We have never paid cash dividends on our common stock and do not anticipate
paying any cash dividends in the foreseeable future.

EFFECT OF ANTI-TAKEOVER PROVISIONS COULD ADVERSELY AFFECT OUR COMMON
STOCKHOLDERS

    Our Certificate of Incorporation and Bylaws include provisions that could
discourage potential takeover attempts and make attempts by stockholders to
change management more difficult. The approval of 66-2/3 percent of our voting
stock is required to approve certain transactions and to take certain
stockholder actions, including the calling of special meetings of stockholders
and the amendment of any of the anti-takeover provisions contained in our
Certificate of Incorporation. Further, pursuant to the terms of our stockholder
rights plan, we have distributed a dividend of one right for each outstanding
share of common stock. These rights will cause substantial dilution to the
ownership of a person or group that attempts to acquire us on terms not approved
by the Board of Directors and may have the effect of deterring hostile takeover
attempts.

                       ADDITIONAL OR UPDATED RISK FACTORS

    Prior to making an investment decision with respect to the common stock
offered hereby, prospective investors should also carefully consider any
specific factors set forth under a caption "risk factors" in the applicable
prospectus supplement, together with all of the other information appearing in
this prospectus or the prospectus supplement or incorporated by reference into
this prospectus.

                                       7
<PAGE>
               SPECIAL NOTE REGARDING FORWARD-LOOKING INFORMATION

    When used in this prospectus, the words "intends to," "believes,"
"anticipates," "expects" and similar expressions are intended to identify
forward-looking statements. These forward-looking statements are based largely
on our expectations and are subject to a number of risks and uncertainties, some
of which are beyond our control. For a discussion of some of these risks, see
"Risk Factors." These forward-looking statements speak only as of the date of
this prospectus. We expressly disclaim any obligation or undertaking to release
publicly any updates or revisions to any forward-looking statement contained
within this prospectus to reflect any change in our expectations with regard to
those forward-looking statements or any change in events, conditions or
circumstances on which any such statement is based.

                      WHERE YOU CAN FIND MORE INFORMATION

    We file annual, quarterly and special reports, proxy statements and other
information with the SEC. This information can be (1) read and copied at the
public reference facilities maintained by the SEC at 450 Fifth Street, N.W.,
Judiciary Plaza, Washington, D.C., and at the SEC's Chicago Regional Office, 500
West Madison Street, Chicago, Illinois; and New York Regional Office, 7 World
Trade Center, New York, New York and (2) accessed via a Web site maintained by
the SEC (http://www.sec.gov). Copies of the material can also be obtained from
the Public Reference Section of the SEC at 450 Fifth Street, N.W., Judiciary
Plaza, Washington, D.C. 20549 at prescribed rates. Please call the SEC at
1-800-SEC-0330 for further information on the public reference rooms.

    This prospectus is a part of a registration statement we filed with the SEC.
This prospectus does not contain all of the information set forth in the
registration statement. For more information about us and our common stock, you
should read the registration statement and its exhibits and schedules. Copies of
the registration statement, including its exhibits may be obtained from the
SEC's principal office in Washington, D.C. upon payment of the fees prescribed
by the SEC, or may be examined without charge at the offices of the SEC.

    The SEC allows us to "incorporate by reference" the information we file with
them, which means that we can disclose important information to you by referring
you to those documents. The information incorporated by reference is considered
to be part of this prospectus, and later information that we file with the SEC
will automatically update and supersede this information. We incorporate by
reference the documents listed below and any future filings made by us with the
SEC under Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of
1934 (File No. 0-18006):

        (a) Our Annual Report on Form 10-K for the year ended December 31, 1998;

        (b) Our Quarterly Report on Form 10-Q for the quarters ended March 31,
    1999 and June 30, 1999;

        (c) Our Current Report on Form 8-K dated May 17, 1999;

        (d) Our Current Report on Form 8-K dated May 14, 1999;

        (e) The description of our common stock set forth in the registration
    statement on Form 8-A filed on March 30, 1990; and

        (f) The description of the Preferred Stock Purchase rights for Series E
    Participating Preferred Stock, par value $0.001, set forth in the
    registration statement on Form 8-A filed on March 4, 1992.

    Upon written or oral request, we will provide without charge to each person
to whom a copy of this prospectus is delivered a copy of the documents
incorporated by reference into this prospectus (other than exhibits to these
documents unless the exhibits are specifically incorporated by reference into
those documents). Requests should be submitted in writing or by telephone at
(760) 431-7080 to The Immune Response Corporation, at our principal executive
offices, 5935 Darwin Court, Carlsbad, California 92008.

                                       8
<PAGE>
                                USE OF PROCEEDS

    Unless otherwise indicated in an accompanying prospectus supplement, the net
proceeds to be received by us from the sale of the common stock will be used for
general corporate purposes, including capital expenditures and to meet working
capital needs. Pending these uses, we will invest the net proceeds in
interest-bearing securities.

                           INCOME TAX CONSIDERATIONS

    Each prospective purchaser should consult his or her own tax advisor with
respect to the income tax issues and consequences of holding and disposing of
the common stock.

                              PLAN OF DISTRIBUTION

    We may offer the common stock:

    - directly to purchasers;

    - to or through underwriters;

    - through dealers, agents or institutional investors; or

    - through a combination of such methods.

    Regardless of the method used to sell the common stock, we will provide a
prospectus supplement that will disclose:

    - the identity of any underwriters, dealers, agents or investors who
      purchase the common stock;

    - the material terms of the distribution, including the number of shares
      sold and the consideration paid;

    - the amount of any compensation, discounts or commissions to be received by
      the underwriters, dealers or agents;

    - the terms of any indemnification provisions, including indemnification
      from liabilities under the federal securities laws; and

    - the nature of any transaction by an underwriter, dealer or agent during
      the offering that is intended to stabilize or maintain the market price of
      our common stock.

                                 LEGAL MATTERS

    The validity of the issuance of the shares offered in this prospectus will
be passed upon for us by Pillsbury Madison & Sutro LLP, San Francisco,
California. A partner of Pillsbury Madison & Sutro LLP owns 15,000 shares of
common stock and an option to acquire 20,000 shares of common stock.

                                    EXPERTS

    Our consolidated financial statements appearing in our Annual Report (Form
10-K) for the year ended December 31, 1998 have been audited by Arthur Andersen
LLP, independent auditors, as set forth in their report thereon included therein
and incorporated herein by reference. The consolidated financial statements are
incorporated herein by reference in reliance upon the authority of that firm as
experts in accounting and auditing.

                                       9
<PAGE>
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

    WE HAVE NOT AUTHORIZED ANY DEALER, SALESPERSON OR ANY OTHER PERSON TO GIVE
ANY INFORMATION OR TO REPRESENT ANYTHING NOT CONTAINED IN THIS PROSPECTUS. YOU
MUST NOT RELY ON ANY UNAUTHORIZED INFORMATION. THIS PROSPECTUS DOES NOT OFFER TO
SELL OR SEEK AN OFFER TO BUY ANY SHARES IN ANY JURISDICTION WHERE IT IS
UNLAWFUL. THE INFORMATION CONTAINED IN THIS PROSPECTUS IS CORRECT ONLY AS OF THE
DATE OF THIS PROSPECTUS, REGARDLESS OF THE TIME OF THE DELIVERY OF THIS
PROSPECTUS OR ANY SALE OF THE SHARES.

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

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
Risk Factors..............................................................    2

Additional or Updated Risk Factors........................................    7

Special Note Regarding Forward-Looking Information........................    8

Where You Can Find More Information.......................................    8

Use of Proceeds...........................................................    9

Income Tax Considerations.................................................    9

Plan of Distribution......................................................    9

Legal Matters.............................................................    9

Experts...................................................................    9
</TABLE>

                                4,000,000 SHARES
                                  COMMON STOCK

                                   THE IMMUNE
                              RESPONSE CORPORATION

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

                                   PROSPECTUS

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

                                AUGUST 20, 1999

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

    The following table sets forth the various expenses in connection with the
sale and distribution of the securities being registered hereby, other than
underwriting discounts and commissions. All amounts are estimated except the
Securities and Exchange Commission registration fee and the Nasdaq National
Market listing fee.

<TABLE>
<CAPTION>
                                                                                     AMOUNT
                                                                                  ------------
<S>                                                                               <C>
SEC registration fee............................................................  $   6,150.47
Accounting fees and expenses....................................................     20,000.00
Legal fees and expenses.........................................................     25,000.00
Registrar and transfer agent's fees.............................................      2,500.00
NNM listing fee.................................................................     17,500.00
Miscellaneous fees and expenses.................................................      3,849.53
                                                                                  ------------
  Total.........................................................................  $  75,000.00
                                                                                  ------------
                                                                                  ------------
</TABLE>

ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS

    Section 145 of the Delaware General Corporation Law (the "Delaware GCL")
permits our board of directors to indemnify any person against expenses
(including attorneys' fees), judgments, fines and amounts paid in settlement
actually and reasonably incurred by him in connection with any threatened,
pending or completed action, suit or proceeding in which such person is made a
party by reason of his being or having been a director, officer, employee or
agent of ours, in terms sufficiently broad to permit such indemnification under
certain circumstances for liabilities (including reimbursement for expenses
incurred) arising under the Securities Act of 1933, as amended (the "Act"). The
Delaware GCL provides that indemnification pursuant to its provisions is not
exclusive of other rights of indemnification to which a person may be entitled
under any by-law, agreement, vote of stockholders or disinterested directors, or
otherwise.

    Article VII of our Restated Certificate of Incorporation, as amended, and
Article V of our Bylaws, provide for indemnification of our directors, officers,
employees and other agents to the maximum extent permitted by law.

    In addition, we have entered into separate indemnification agreements with
our directors and officers that will require us, among other things, to
indemnify them against certain liabilities that may arise by reason of their
status or service as directors or officers to the fullest extent not prohibited
by law.

                                      II-1
<PAGE>
ITEM 16. EXHIBITS

<TABLE>
<CAPTION>
EXHIBIT
NUMBER                                   DESCRIPTION OF DOCUMENT*
- ---------  ------------------------------------------------------------------------------------
<C>        <S>
   5.1(1)  Opinion of Pillsbury Madison & Sutro LLP regarding the legality of the securities
             being registered.

  23.1     Consent of independent public accountants.

  23.2(1)  Consent of Pillsbury Madison & Sutro LLP (included in its opinion filed as Exhibit
             5.1 to this Registration Statement).

  24.1(1)  Power of Attorney.
</TABLE>

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

(1) Previously filed.

ITEM 17. UNDERTAKINGS

    Insofar as indemnification for liabilities arising under the Securities Act
of 1933, as amended (the "Act"), may be permitted to our directors, officers and
controlling persons pursuant to the foregoing provisions, or otherwise, we have
been advised that in the opinion of the Securities and Exchange Commission such
indemnification is against public policy as expressed in the Act and is,
therefore, unenforceable. In the event that a claim for indemnification against
such liabilities (other than the payment by us of expenses incurred or paid by a
director, officer or controlling person of ours in the successful defense of any
action, suit or proceeding) is asserted by such director, officer or controlling
person in connection with the securities being registered, we will, unless in
the opinion of our counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by us is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.

    We hereby undertake:

        (1) To file during any period in which offers or sales are being made, a
    post-effective amendment to this registration statement; (i) to include any
    prospectus required by Section 10(a)(3) of the Act; (ii) to reflect in the
    prospectus any facts or events arising after the effective date of the
    registration statement (or the most recent post-effective amendment thereof)
    which, individually or in the aggregate, represent a fundamental change in
    the information set forth in this registration statement; and (iii) to
    include any material information with respect to the plan of distribution
    not previously disclosed in this registration statement or any material
    change to such information in this registration statement; provided,
    however, that paragraphs (i) and (ii) do not apply if the information
    required to be included in a post-effective amendment by those paragraphs is
    contained in periodic reports filed by us pursuant to Section 13 or Section
    15(d) of the Securities Exchange Act of 1934, as amended (the "Exchange
    Act") that are incorporated by reference in this registration statement.

        (2) That, for the purpose of determining any liability under the Act,
    each post-effective amendment that contains a form of prospectus shall be
    deemed to be a new registration statement relating to the securities offered
    therein, and the offering of such securities at that time shall be deemed to
    be the initial bona fide offering thereof.

        (3) To remove from registration by means of a post-effective amendment
    any of the securities being registered which remain unsold at the
    termination of the offering.

        (4) For purposes of determining any liability under the Act, each filing
    of our annual report pursuant to Section 13(a) or Section 15(d) of the
    Exchange Act which is incorporated by reference in this registration
    statement shall be deemed to be a new registration statement relating to the
    securities offered therein, and the offering of such securities at that time
    shall be deemed to be the initial bona fide offering thereof.

                                      II-2
<PAGE>
                                   SIGNATURES

    Pursuant to the requirements of the Securities Act of 1933, we certify that
we have reasonable grounds to believe that we meet all of the requirements for
filing on Form S-3, and have duly caused this amendment to registration
statement to be signed on our behalf by the undersigned, thereunto duly
authorized, in the City of Carlsbad, State of California, August 19, 1999.

<TABLE>
<S>                             <C>  <C>
                                THE IMMUNE RESPONSE CORPORATION

                                By:          /s/ DENNIS J. CARLO, PH.D.
                                     -----------------------------------------
                                               Dennis J. Carlo, Ph.D.
                                       PRESIDENT AND CHIEF EXECUTIVE OFFICER
</TABLE>

    Pursuant to the requirements of the Securities Act of 1933, this amendment
to registration statement has been signed by the following persons in the
capacities and on the dates indicated:

<TABLE>
<CAPTION>
          SIGNATURE                       TITLE                    DATE
- ------------------------------  --------------------------  -------------------

<C>                             <S>                         <C>
                                President, Chief Executive
  /s/ DENNIS J. CARLO, PH.D.      Officer, Chief
- ------------------------------    Scientific Officer and      August 19, 1999
    Dennis J. Carlo, Ph.D.        Director (Principal
                                  Executive Officer)

                                Vice President Finance,
      /s/ HOWARD SAMPSON          Chief Financial Officer
- ------------------------------    and Treasurer (Principal    August 19, 1999
        Howard Sampson            Financial and Principal
                                  Accounting Officer)

              *
- ------------------------------  Chairman of the Board of      August 19, 1999
       James B. Glavin            Directors

              *
- ------------------------------  Director                      August 19, 1999
      Kevin B. Kimberlin

              *
- ------------------------------  Director                      August 19, 1999
       Melvin Perelman

              *
- ------------------------------  Director                      August 19, 1999
      Steven P. Richieri

              *
- ------------------------------  Director                      August 19, 1999
          John Simon

              *
- ------------------------------  Director                      August 19, 1999
     William M. Sullivan
</TABLE>

                                      II-3
<PAGE>
<TABLE>
<CAPTION>
          SIGNATURE                       TITLE                    DATE
- ------------------------------  --------------------------  -------------------

<C>                             <S>                         <C>
              *
- ------------------------------  Director                      August 19, 1999
       Philip M. Young
</TABLE>

<TABLE>
<S>   <C>                        <C>                         <C>
*By:     /s/ HOWARD SAMPSON
      -------------------------
           Howard Sampson
          ATTORNEY-IN-FACT
</TABLE>

                                      II-4
<PAGE>
                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
 EXHIBIT
 NUMBER                                            DESCRIPTION OF DOCUMENT
- ---------  --------------------------------------------------------------------------------------------------------
<C>        <S>
   5.1(1)  Opinion of Pillsbury Madison & Sutro LLP regarding the legality of the securities being registered.

  23.1     Consent of independent public accountants.

  23.2(1)  Consent of Pillsbury Madison & Sutro LLP (included in its opinion filed as Exhibit 5.1 to this
             Registration Statement).

  24.1(1)  Power of Attorney.
</TABLE>

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

(1) Previously filed.

<PAGE>
                                                                    EXHIBIT 23.1

                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

    As independent public accountants, we hereby consent to the incorporation by
reference in this registration statement of our report dated January 21, 1999
included in The Immune Response Corporation's Form 10-K for the year ended
December 31, 1998 and to all references to our Firm included in this
registration statement.

                                          /s/ ARTHUR ANDERSEN LLP

San Diego, California
August 17, 1999


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