INTERFERON SCIENCES INC
S-2/A, 1995-08-02
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>   1
 
   
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON AUGUST 2, 1995
    
 
                                                       REGISTRATION NO. 33-59479
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
   
                                AMENDMENT NO. 2
    
                                       TO
 
                                    FORM S-2
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
 
                           INTERFERON SCIENCES, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
<TABLE>
<S>                                                     <C>
                        DELAWARE                                               22-2313648
              (STATE OR OTHER JURISDICTION                                  (I.R.S. EMPLOYER
           OF INCORPORATION OR ORGANIZATION)                             IDENTIFICATION NUMBER)
</TABLE>
 
                               783 JERSEY AVENUE
                        NEW BRUNSWICK, NEW JERSEY 08901
                                 (908) 249-3250
              (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
       INCLUDING AREA CODE, OF REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
 
                            LAWRENCE M. GORDON, ESQ.
                                GENERAL COUNSEL
                           INTERFERON SCIENCES, INC.
                               9 WEST 57TH STREET
                            NEW YORK, NEW YORK 10019
                                 (212) 230-9513
           (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
                   INCLUDING AREA CODE, OF AGENT FOR SERVICE)
 
                                   COPIES TO:
 
<TABLE>
<S>                                                     <C>
                 ROBERT J. HASDAY, ESQ.                                  KENNETH R. KOCH, ESQ.
               DUANE, MORRIS & HECKSCHER                      SQUADRON, ELLENOFF, PLESENT & SHEINFELD, LLP
                       SUITE 2125                                           551 FIFTH AVENUE
                  122 EAST 42ND STREET                                  NEW YORK, NEW YORK 10176
                NEW YORK, NEW YORK 10168
</TABLE>
 
    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE OF SECURITIES TO THE
PUBLIC: As soon as practicable after the effective date of this Registration
Statement.
 
    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, check the following box:  /X/
 
    If the registrant elects to deliver its latest annual report to security
holders, or a complete and legible facsimile thereof, pursuant to Item 11(a)(1)
of this form, check the following box:  / /
                            ------------------------
 
                        CALCULATION OF REGISTRATION FEE
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
   
<TABLE>
<CAPTION>
                                                                              PROPOSED           PROPOSED
                                                                              MAXIMUM            MAXIMUM
                TITLE OF EACH CLASS OF                   AMOUNT TO BE      OFFERING PRICE       AGGREGATE          AMOUNT OF
             SECURITIES TO BE REGISTERED                  REGISTERED        PER SHARE(1)    OFFERING PRICE(1)   REGISTRATION FEE
<S>                                                   <C>                <C>                <C>                <C>
- ------------------------------------------------------------------------------------------------------------------------------
Common Stock, par value $.01 per share................ 12,000,000 shares       $ 1.20          $ 14,400,000        $ 4,965.52
- ------------------------------------------------------------------------------------------------------------------------------
Underwriter's Purchase Options(2)..................... 1,123,332 Options       $ .001          $      1,123        $      .39
- ------------------------------------------------------------------------------------------------------------------------------
Common Stock, par value $.01 per share(3).............  1,123,332 shares       $ 1.44          $  1,617,598        $   557.79
- ------------------------------------------------------------------------------------------------------------------------------
        Total.........................................                                                             $ 5,523.70(4)
- ------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------
</TABLE>
    
 
(1) Estimated solely for the purpose of calculating the registration fee.
(2) To be issued to the Underwriter.
(3) Shares issuable upon exercise of the Underwriter's Purchase Options.
   
(4) 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>   2
 
                           INTERFERON SCIENCES, INC.
            CROSS REFERENCE SHEET SHOWING LOCATION IN PROSPECTUS OF
                   INFORMATION REQUIRED BY ITEMS OF FORM S-2
 
<TABLE>
<CAPTION>
                REGISTRATION STATEMENT
                   ITEM AND HEADING                          LOCATION IN PROSPECTUS
      ------------------------------------------  --------------------------------------------
<C>   <S>                                         <C>
  1.  Forepart of the Registration Statement and
      Outside Front Cover Page of Prospectus....  Outside Front Cover Page of Prospectus
  2.  Inside Front and Outside Back Cover Pages
      of Prospectus.............................  Inside Front and Outside Back Cover Pages of
                                                  Prospectus; Additional Information
  3.  Summary Information, Risk Factors and
      Ratio of Earnings to Fixed Charges........  Prospectus Summary; Summary Financial
                                                  Information; Risk Factors; and Selected
                                                  Financial Information
  4.  Use of Proceeds...........................  Prospectus Summary; Use of Proceeds; Risk
                                                  Factors
  5.  Determination of Offering Price...........  Outside Front Cover Page; Risk Factors;
                                                  Underwriting
  6.  Dilution..................................  Dilution
  7.  Selling Security Holders..................  Not Applicable
  8.  Plan of Distribution......................  Outside Front Cover Page of Prospectus;
                                                  Underwriting
  9.  Description of Securities to be
      Registered................................  Prospectus Summary; Description of
                                                  Securities; Underwriting
 10.  Interests of Named Experts and Counsel....  Not Applicable
 11.  Information with Respect to the
      Registrant................................  Inside Front Cover Page of Prospectus;
                                                  Prospectus Summary; The Company; Risk
                                                  Factors; Dilution; Use of Proceeds; Price
                                                  Range of Common Stock; Dividend Policy;
                                                  Capitalization; Selected Financial
                                                  Information; Management's Discussion and
                                                  Analysis of Financial Condition and Results
                                                  of Operations; Business; Management;
                                                  Principal Stockholders; Certain
                                                  Transactions; Description of Securities;
                                                  Financial Statements
 12.  Incorporation of Certain Information by
      Reference.................................  Documents Incorporated by Reference
 13.  Disclosure of Commission Position on
      Indemnification for Securities Act
      Liabilities...............................  Not Applicable
</TABLE>
<PAGE>   3
 
     INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
     REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
     SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR
     MAY OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT
     BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR
     THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE
     SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE
     UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS
     OF ANY SUCH STATE.
 
   
PROSPECTUS        Subject to Completion, Dated August 1, 1995
    
 
                           INTERFERON SCIENCES, INC.
 
   
                   MINIMUM: 6,500,000 SHARES OF COMMON STOCK
    
   
                   MAXIMUM: 12,000,000 SHARES OF COMMON STOCK
    
 
     The shares of Common Stock, par value $.01 per share (the "Common Stock"),
of Interferon Sciences, Inc., a Delaware corporation (the "Company"), being
offered hereby are being sold by the Company. See "Underwriting" for information
relating to the factors considered in determining the public offering price.
 
   
     The Common Stock is quoted on the NASDAQ National Market System under the
symbol "IFSC." On July 31, 1995, the last reported sale price of the Common
Stock on the NASDAQ National Market System was $1 15/16 per share.
    
                            ------------------------
 
    INVESTMENT IN THE SHARES OFFERED HEREBY INVOLVES A HIGH DEGREE OF RISK.
              SEE "RISK FACTORS" ON PAGES 8-16 OF THIS PROSPECTUS.
                            ------------------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
   EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION, NOR HAS THE
      SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
      COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
        PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL
          OFFENSE.
 
   
<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------
                                                     UNDERWRITING DISCOUNTS         PROCEEDS TO
                              PRICE TO PUBLIC          AND COMMISSIONS(1)          COMPANY(2)(3)
- ------------------------------------------------------------------------------------------------------
<S>                             <C>                        <C>                      <C>
Per Share...............           $1.20                     $.099                     $1.101
- ------------------------------------------------------------------------------------------------------
Total Minimum...........         $7,800,000                 $567,600                 $7,232,400
- ------------------------------------------------------------------------------------------------------
Total Maximum...........        $14,400,000                $1,112,100               $13,287,900
- ------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------
</TABLE>
    
 
   
(1) No Underwriting Discounts and Commissions are payable with respect to
    766,668 shares of Common Stock (the "Principal Stockholder Shares") certain
    principal stockholders of the Company have agreed to purchase in the
    Offering. Excludes additional compensation to be received by the
    Underwriter, including (i) a non-accountable expense allowance of 1.75% of
    the gross proceeds (other than the gross proceeds from the sale of the
    Principal Stockholder Shares) of the Offering, (ii) a non-accountable
    expense allowance for legal fees in an amount not to exceed the lesser of
    (a) $100,000 and (b) 1% of the gross proceeds (other than the gross proceeds
    from the sale of the Principal Stockholder Shares) of the Offering, (iii) an
    accountable expense allowance for disbursements of counsel to the
    Underwriter, and (iv) options to purchase up to a number of shares of Common
    Stock equal to 10% of the number of shares of Common Stock (other than the
    Principal Stockholder Shares) sold in the Offering, exercisable over a
    period of four years commencing one year from the date of this Prospectus at
    an exercise price equal to 120% of the public offering price of the shares
    offered hereby (the "Underwriter's Purchase Options"). The Company has also
    agreed to indemnify the Underwriter against certain liabilities, including
    liabilities arising under the Securities Act of 1933, as amended. See
    "Underwriting."
    
 
   
(2) Before deducting estimated expenses payable by the Company of $599,200 if
    the minimum number of shares are sold and $745,900 if the maximum number of
    shares are sold, including the Underwriter's expense allowances. See
    "Underwriting."
    
 
   
(3) The shares of Common Stock are being offered by the Underwriter as the agent
    for the Company on a "best efforts" 6,500,000 share minimum, 12,000,000
    share maximum, basis for 30 days from the date of this Prospectus (which
    period may be extended for an additional 30 days by the Underwriter). There
    is no minimum number of shares required to be purchased by any investor. The
    Company's officers, directors, employees, and principal stockholders may
    purchase shares of Common Stock in the Offering. All such purchases
    (including the Principal Stockholder Shares) may be used to satisfy the
    6,500,000 share minimum. Pending the sale of the 6,500,000 share minimum,
    all proceeds will be deposited into an escrow account with Bank of Montreal
    Trust Company, Escrow Agent for the Offering. After the sale of the initial
    6,500,000 shares, the remaining 5,500,000 shares will also be offered on a
    "best efforts" basis. In the event the minimum number of shares is not sold
    within the offering period or any extension thereof, the Offering will
    terminate and all funds will be returned promptly to subscribers by the
    Escrow Agent without any deduction therefrom or interest thereon.
    
 
   
     The shares of Common Stock are being offered on a "best efforts" 6,500,000
share minimum, 12,000,000 share maximum, basis by the Underwriter, subject to
prior sale, withdrawal, or cancellation of the Offering without notice. Any
modification to the Offering will be made by means of an amendment to this
Prospectus. The Company reserves the right to modify, withdraw, or cancel the
Offering without notice, and to reject any orders for the shares of Common Stock
offered hereby, in whole or in part. It is expected that delivery of the
certificates representing the shares of Common Stock will be made at the offices
of Sunrise Securities Corp., 919 Third Avenue, New York, New York 10022.
    
                            ------------------------
 
                            SUNRISE SECURITIES CORP.
 
                THE DATE OF THIS PROSPECTUS IS           , 1995
<PAGE>   4
 
                             AVAILABLE INFORMATION
 
     The Prospectus omits certain of the information contained in the
Registration Statement relating to the securities offered hereby which is on
file with the Securities and Exchange Commission (the "Commission"). The Company
is subject to the informational requirements of the Securities Exchange Act of
1934, as amended (the "Exchange Act"), and in accordance therewith files
periodic reports, proxy statements, and other information with the Commission.
Such Registration Statement, reports, proxy statements, and other information
can be inspected, without charge, and copied at the public reference facilities
maintained by the Commission at Judiciary Plaza, 450 Fifth Street, N.W., Room
1024, Washington, D.C. 20549, and at its regional offices located at 7 World
Trade Center, 13th Floor, New York, New York 10048 and Northwestern Atrium
Center, 500 West Madison Street, Chicago, Illinois 60061. Copies of such
material can be obtained at prescribed rates from the Public Reference Section
of the Commission at Judiciary Plaza, 450 Fifth Street, N.W., Room 1024,
Washington, D.C. 20549.
 
                      DOCUMENTS INCORPORATED BY REFERENCE
 
     The following documents filed by the Company with the Commission are
incorporated in this Prospectus by reference:
 
          (a) the Company's Annual Report on Form 10-K for the year ended
     December 31, 1994; and
 
          (b) the Company's Quarterly Report on Form 10-Q for the quarter ended
     March 31, 1995.
 
     Any statement contained in a document incorporated or deemed to be
incorporated by reference herein shall be deemed to be modified or superseded
for purposes of this Prospectus to the extent that a statement contained herein
modifies, supersedes, or replaces such statement. Any statement so modified or
superseded shall not be deemed, except as so modified or superseded, to
constitute a part of this Prospectus. Any person receiving a copy of this
Prospectus may obtain without charge, upon written or oral request, a copy of
any of the documents incorporated by reference herein, except for exhibits to
such documents (unless such exhibits are specifically incorporated by reference
into the documents which this Prospectus incorporates). Requests should be
directed to: Corporate Secretary, Interferon Sciences, Inc., 783 Jersey Avenue,
New Brunswick, New Jersey 08901, telephone number (908) 249-3250.
                            ------------------------
 
     ALFERON(R) and ALFERON LDO(R) are registered trademarks of the Company.
 
                                        2
<PAGE>   5
 
                               PROSPECTUS SUMMARY
 
     The following summary is qualified in its entirety by the more detailed
information and consolidated financial statements, including the notes thereto,
appearing elsewhere in this Prospectus. Unless otherwise indicated, all
information in this Prospectus assumes that the minimum number of shares of
Common Stock is sold and that no outstanding stock options or warrants are
exercised.
 
                                  THE COMPANY
 
     General
 
     Interferon Sciences, Inc. (the "Company") is a biopharmaceutical company
currently engaged in the manufacture and sale of ALFERON N Injection, the only
product approved by the United States Food and Drug Administration ("FDA") that
is based upon a natural source, multi-species alpha interferon ("Natural Alpha
Interferon"). ALFERON N Injection is approved for the treatment by injection of
certain types of genital warts and is being developed by the Company for the
potential treatment of hepatitis C, hepatitis B, HIV, multiple sclerosis,
cancers, and other indications. The Company believes that the existing FDA
approval of ALFERON N Injection for one indication should facilitate obtaining
approvals for other indications. The Company also is developing ALFERON N Gel
and ALFERON LDO, the Company's topical and oral formulations of Natural Alpha
Interferon.
 
     Interferons are a group of proteins produced and secreted by cells to
combat diseases. Currently, various alpha interferon products, approved for 17
different medical uses in over 60 countries, are, as a group, one of the largest
selling of all biopharmaceuticals, with estimated 1994 sales in excess of $1.5
billion worldwide. A substantial majority of these sales are for the treatment
of hepatitis C, a liver disease affecting several million people worldwide,
including two to three million people in the United States and three million
people in Japan. As described below, the Company is presently conducting three
multi-center Phase 2 trials using Natural Alpha Interferon for the treatment of
hepatitis C.
 
     Natural Alpha Interferon
 
     A substantial portion of worldwide sales of interferon consists of sales of
alpha interferon produced from genetically engineered cells (recombinant alpha
interferon). Based on laboratory studies and clinical trials involving Natural
Alpha Interferon, the Company believes that Natural Alpha Interferon has certain
potential advantages over recombinant alpha interferon including:
 
        Efficacy.  Natural Alpha Interferon is used at significantly lower doses
        than the competing recombinant alpha interferon product for the
        treatment of genital warts and, in laboratory studies, was shown to be
        10 to 100 times more effective than recombinant alpha interferon in
        blocking replication of HIV. This unusually potent anti-HIV activity may
        be due to specific members of the interferon family of proteins which
        are present in Natural Alpha Interferon but not found in the presently
        marketed recombinant interferons.
 
        Side effects.  The principal side effects of alpha interferon are
        flu-like symptoms, which are dose dependent. The approved treatment with
        ALFERON N Injection utilizes lower doses than the treatment with
        recombinant alpha interferon, which may account, in part, for fewer side
        effects being observed in patients being treated with Natural Alpha
        Interferon. Based on a double-blind study of normal healthy adults, the
        Company believes there is evidence that even when given at the same
        doses as recombinant alpha interferon, the side effects are lower with
        Natural Alpha Interferon. Furthermore, in a Phase 1 clinical trial on 20
        asymptomatic HIV-infected patients, investigators at Walter Reed Army
        Institute of Research ("Walter Reed") reported that significantly fewer
        of the typical side effects associated with recombinant alpha interferon
        were observed with Natural Alpha Interferon. In addition,
        interferon-neutralizing antibodies, which may limit alpha interferon's
        therapeutic benefit, have not been observed to date in clinical trials
        with Natural Alpha Interferon, even in HIV and hepatitis C patients
        treated with high doses of such product three times a week for up to six
        months. There have been reports of these antibodies developing in
        patients being treated with recombinant alpha interferons.
 
                                        3
<PAGE>   6
 
     Although, as described above, the Company believes that Natural Alpha
Interferon may have certain advantages over recombinant alpha interferon, there
can be no assurance that these advantages will enable the Company to obtain a
significant market share for products made with Natural Alpha Interferon.
Moreover, at the present time, the Company is limited in its ability to make
product marketing claims related to these potential advantages until additional
data are available and, in certain instances, until further FDA approvals are
obtained. Additionally, the Company derives Natural Alpha Interferon from human
white blood cells, the cost and availability of which are subject to
fluctuation, in part because the Company does not presently have long-term
agreements or multiple sources for the supply of such cells. Recombinant alpha
interferon products are not dependent on a source of human white blood cells
and, therefore, can be produced in greater volume and at a lower cost per unit
than the Company's formulations of Natural Alpha Interferon products. See
"Business -- Scientific Background."
 
     Marketing, Distribution, and Production
 
     ALFERON N Injection is approved for sale in the United States for the
intralesional treatment of adults with refractory (resistant to other treatment)
or recurring external genital warts, and is currently marketed and distributed
in the United States exclusively by Purdue Pharma L.P. ("Purdue Pharma" and,
collectively with its affiliates, "Purdue"). The Company has an option to
repurchase the marketing rights for ALFERON N Injection in the United States and
Canada from Purdue. See "Business -- ALFERON N Injection -- Approved Indication"
and "Business -- ALFERON N Injection -- Marketing and Distribution -- Agreements
with Purdue."
 
   
     In the first quarter of 1995, the Company entered into an agreement with
Fujimoto Diagnostics, Inc. ("Fujimoto") for the development and marketing of
ALFERON N Injection and ALFERON N Gel in Japan. Japan is currently the world's
largest market for interferon products, with 1994 annual sales approaching $900
million. Under the terms of the agreement, Fujimoto agreed to purchase
$2,000,000 of the Company's Common Stock and to use its best efforts to develop,
and obtain Japanese regulatory approvals for, ALFERON N Injection and ALFERON N
Gel products. The Company believes that Fujimoto's development effort will
entail a substantial expense on Fujimoto's part. In addition, the Company's
Natural Alpha Interferon injectable product was recently approved for sale in
Mexico for the treatment of genital warts and will be marketed under the trade
name ALTEMOL(R) by Industrica Farmaceutica Andromaco S.A. De C.V. ("Andromaco").
See "Business -- ALFERON N Injection -- Marketing and Distribution -- Other
Marketing and Distribution Arrangements."
    
 
     The Company is also exploring development and marketing arrangements that
would involve the potential use of Natural Alpha Interferon for the treatment of
hepatitis B and C, multiple sclerosis, HIV, and cancer. See "Risk
Factors -- Dependence on Certain Distributors; Limited Marketing Program."
 
     The purified drug concentrate utilized in the formulation of ALFERON N
Injection is manufactured in a Company-owned, FDA-approved facility located in
New Brunswick, New Jersey. ALFERON N Injection is formulated and packaged for
the Company by Sanofi Winthrop Pharmaceuticals, Inc. ("Sanofi") at a production
facility located in McPherson, Kansas. See "Business -- ALFERON N Injection --
Manufacturing."
 
     Recently Expanded License
 
     As of March 31, 1995, the Company obtained a non-exclusive license from
Hoffmann-LaRoche, Inc. ("Hoffmann") and F. Hoffmann-LaRoche Ltd. ("Roche") which
grants the Company the worldwide rights to make, use, and sell, without a
potential patent infringement claim from Hoffmann or Roche, any formulation of
Natural Alpha Interferon. The 1995 license replaced a 1988 non-exclusive license
from Hoffmann which granted the Company the rights to make, use, and sell in the
United States, without a potential patent infringement claim from Hoffmann,
injectable formulations of Natural Alpha Interferon for the treatment of genital
warts or patients with diseases refractory to recombinant interferon therapy.
The 1995 license will enable the Company, if successful in obtaining necessary
regulatory approvals, to expand the formulations of Natural Alpha Interferon it
makes, uses, and sells in the United States and the rest of the
 
                                        4
<PAGE>   7
 
world and to market its products for the treatment of additional indications.
See "Risk Factors -- Potential Patent Infringement Claims," "Business -- ALFERON
N Injection -- Patents and Licenses," and "Business -- ALFERON N
Injection -- Royalty Obligations."
 
     Clinical Trials
 
     The Company is conducting or planning various clinical trials in an effort
to obtain approval to market ALFERON N Injection for additional indications in
the United States and around the world.
 
     The Company is presently conducting three multi-center, randomized,
open-label, dose-ranging Phase 2 clinical trials in patients infected with
hepatitis C virus (HCV). The objective of these HCV clinical studies is to
compare the safety and efficacy of different doses of Natural Alpha Interferon
injected subcutaneously in naive (previously untreated), refractory
(unsuccessfully treated with recombinant alpha interferon), and relapsing
(initially responded to recombinant alpha interferon but later relapsed)
patients. The Company believes that the preliminary results of such trials are
promising.
 
     In a recent follow-up analysis of patients in the Walter Reed Phase 1
clinical trial, it was found that an average of 16 months after treatment, CD4
lymphocyte levels (the white blood cells which normally decline in HIV-infected
patients) remained essentially unchanged or were higher than at the onset of the
trial in 11 of 20 patients. In addition, the amount of HIV detectable in the
patients' blood, as measured by a quantitative PCR (Polymerase Chain Reaction)
technique, declined in a dose dependent manner (the greatest declines were
observed in the highest dose group). Although there can be no assurance that the
results of laboratory studies and the Phase 1 clinical trial will be reproduced
in a large-scale, controlled clinical trial, based upon the foregoing, the
Company believes that Natural Alpha Interferon may have potential clinical value
in the treatment of HIV-infected patients. The Company is planning to conduct a
multi-center clinical trial with HIV-infected patients, which is expected to
commence in 1995.
 
     Two additional Phase 2 clinical studies are in progress. One is for the
treatment of Kaposi's sarcoma in patients with AIDS and the other is a
multi-center study in small cell lung cancer patients following successful
treatment by conventional chemotherapy. The goal of the small cell lung cancer
study is to see if Natural Alpha Interferon can alter the high relapse rate in
this disease.
 
     Based upon encouraging anecdotal data, the Company is planning, subject to
obtaining funding or a sponsor, to conduct clinical trials utilizing Natural
Alpha Interferon for the treatment of multiple sclerosis, which affects more
than 250,000 Americans. See "Business -- ALFERON N Injection -- Clinical Trials
for New Indications."
 
     Commercial sales in the United States or Mexico of ALFERON N Injection for
any indication other than the treatment of genital warts, commercial sales
outside of the United States and Mexico of ALFERON N Injection for any
indication, and commercial sales anywhere in the world of either ALFERON N Gel
or ALFERON LDO will be contingent upon the completion of necessary studies and
the approval of such products for such uses by the FDA and foreign regulatory
authorities. Submissions for regulatory approval to sell ALFERON N Injection for
the treatment of genital warts have been filed in various other countries. See
"Business -- Governmental Regulation," "Risk Factors -- Regulating Approvals,"
and "Risk Factors -- Foreign Regulatory Approvals."
 
     Although the Company received FDA approval to market ALFERON N Injection in
1989, to date it has had only limited revenue from the sale of ALFERON N
Injection. The Company has experienced significant operating losses since its
inception in 1980. As of March 31, 1995, the Company had an accumulated deficit
of approximately $64.6 million. See "Management's Discussion and Analysis of
Financial Condition and Results of Operations."
 
                                        5
<PAGE>   8
 
                                  THE OFFERING
 
   
<TABLE>
<S>                                           <C>
Common Stock offered hereby...............    A minimum of 6,500,000 shares and a
                                              maximum of 12,000,000 shares, on a best
                                              efforts basis.
 
Common Stock to be outstanding after the
  Offering................................    A minimum of 28,948,768 shares and a
                                              maximum of 34,448,768 shares(1).
 
Use of Proceeds...........................    The Company anticipates that if the
                                              minimum number of shares are sold,
                                              approximately $3,000,000, and if the
                                              maximum number of shares are sold,
                                              approximately $7,000,000, of the net
                                              proceeds of the Offering will be used for
                                              research, product development, and
                                              clinical trials; approximately $1,600,000
                                              of the net proceeds will be used to repay
                                              indebtedness to certain principal
                                              stockholders; and the balance will be used
                                              for working capital and general corporate
                                              purposes. See "Use of Proceeds."
 
NASDAQ National Market System Symbol......    IFSC.
 
Risk Factors..............................    Purchase of the Common Stock offered
                                              hereby involves a high degree of risk.
                                              Prospective purchasers should consider
                                              carefully the factors specified under
                                              "Risk Factors."
</TABLE>
    
 
- ---------------
 
   
(1) Does not include (i) 2,864,350 shares of Common Stock reserved for issuance
    upon the exercise of options currently outstanding under the Company's stock
    option plan, (ii) 886,000 shares reserved for issuance upon the exercise of
    currently outstanding warrants, and (iii) 1,123,332 shares reserved for
    issuance upon the exercise of the Underwriter's Purchase Options. See
    
    "Underwriting."
 
                                        6
<PAGE>   9
 
                         SUMMARY FINANCIAL INFORMATION
                      (In thousands except per share data)
 
<TABLE>
<CAPTION>
                                            THREE MONTHS ENDED
                                                 MARCH 31,            YEAR ENDED DECEMBER 31,
                                            -------------------   --------------------------------
                                              1995       1994       1994        1993        1992
                                            --------   --------   --------     -------     -------
<S>                                         <C>        <C>        <C>          <C>         <C>
STATEMENT OF OPERATIONS DATA
Revenues(1)...............................  $    180   $      1   $  1,166     $    51     $ 3,306
Research and development costs, net.......       960      1,169      5,196       4,151       3,983
Loss from operations......................    (1,795)    (2,371)   (11,782)     (8,347)     (5,953)
Net loss..................................    (1,798)    (2,346)   (12,078)     (8,460)     (5,997)
Net loss per share of Common Stock........      (.08)      (.12)      (.62)       (.55)       (.42)
Weighted average number of shares of
  Common Stock outstanding................    21,199     19,417     19,594      15,432      14,357
</TABLE>
 
   
<TABLE>
<CAPTION>
                                                              MARCH 31, 1995
                                                       -----------------------------
                                                                   AS ADJUSTED(2)        
                                                                 -------------------   DECEMBER 31,
                                                       ACTUAL    MINIMUM     MAXIMUM       1994
                                                       -------   -------     -------   ------------
<S>                                                    <C>       <C>         <C>         <C>
BALANCE SHEET DATA
Total assets.........................................  $ 7,786   $14,294     $20,203     $8,182
Working capital (deficiency).........................     (907)    5,601      11,510       (782)
Current maturities of long-term debt.................      274       274         274        409
Common Stock subject to repurchase commitment(3).....    2,730       250(4)      250(4)   2,730
Stockholders' equity.................................    2,664    11,652      17,561      2,979
</TABLE>
    
 
- ---------------
 
(1) Substantially all of the Company's revenues in 1992, 1994, and the three
    months ended March 31, 1995 were from sales of ALFERON N Injection to
    Purdue. Purdue did not purchase ALFERON N Injection from the Company in 1993
    or the three months ended March 31, 1994. Purdue has informed the Company
    that during 1993, 1994, and the three months ended March 31, 1995, Purdue
    sold approximately 23,000, 25,000, and 6,800 vials, respectively, and
    distributed as free samples approximately 2,800, 2,000, and 200 vials,
    respectively, of ALFERON N Injection from its inventory. See "Management's
    Discussion and Analysis of Financial Condition and Results of Operations
     -- Liquidity and Capital Resources."
 
   
(2) Adjusted to give effect to (i) the sale of the minimum and maximum number of
    shares of Common Stock in the Offering, (ii) the termination of the
    commitment to repurchase 619,994 shares of Common Stock held by Purdue, and
    (iii) the $125,000 writedown of March 31, 1995 inventory resulting from the
    July 1995 agreement with Purdue that the transfer price for each vial of
    ALFERON N Injection sold to Purdue will be paid $25 in cash and the balance
    as an offset to the cash exercise price of the Company's option to reacquire
    certain marketing rights from Purdue. See "Capitalization," "Management's
    Discussion and Analysis of Financial Condition and Results of
    Operations -- Liquidity and Capital Resources," and "Business -- ALFERON N
    Injection -- Marketing and Distribution -- Agreements with Purdue."
    
 
   
(3) Represents the Company's obligation to purchase an aggregate of 682,494
    shares of Common Stock from Purdue, of which 62,500 shares were required to
    be repurchased in April 1995 and 619,994 shares are required to be
    repurchased on August 31, 1995 (or such earlier date on which the Offering
    shall terminate prior to the sale of the minimum number of shares of Common
    Stock). Upon the sale of the minimum number of shares of Common Stock in the
    Offering, the repurchase of the 62,500 shares will be completed and the
    commitment to repurchase the 619,994 shares will terminate. However, the
    Company will still have the obligation to repurchase the 619,994 shares from
    Purdue if the Company decides to exercise an option, which becomes effective
    upon the sale of the minimum number of shares of Common Stock in the
    Offering and is exercisable until December 31, 1996, to repurchase certain
    marketing rights from Purdue. See "Management's Discussion and Analysis of
    Financial Condition and Results of Operations -- Liquidity and Capital
    Resources" and "Business -- ALFERON N Injection -- Marketing and
    Distribution -- Agreements with Purdue."
    
 
   
(4) Consists of 62,500 shares of Common Stock required to be repurchased from
    Purdue in April 1995. See "Management's Discussion and Analysis of Financial
    Condition and Results of Operations -- Liquidity and Capital Resources."
    
 
                                        7
<PAGE>   10
 
                                  THE COMPANY
 
     The Company, which was incorporated in Delaware in May 1980, commenced
operations in January 1981 by obtaining from National Patent Development
Corporation ("NPDC"), a principal stockholder of the Company and then its
parent, assets relating to NPDC's programs in human alpha interferon. The
Company's principal offices and research and production facilities are located
at 783 Jersey Avenue, New Brunswick, New Jersey 08901 and its telephone number
is (908) 249-3250.
 
                                  RISK FACTORS
 
     Prospective investors should consider carefully the following factors,
together with the other information contained in this Prospectus, in evaluating
an investment in the Common Stock offered hereby.
 
     CONTINUING AND INCREASING OPERATING LOSSES; ACCUMULATED DEFICIT.  The
Company has experienced significant operating losses since its inception in
1980. As of March 31, 1995, the Company had an accumulated deficit of
approximately $64.6 million. For the three months ended March 31, 1995 and the
years ended December 31, 1994, 1993, and 1992, the Company had losses from
operations of approximately $1.8 million, $11.8 million, $8.3 million, and $6.0
million, respectively. The Independent Auditors' Report on the Company's 1994
financial statements indicates that such accumulated deficit and operating
losses raise substantial doubt about the Company's ability to continue as a
going concern.
 
     Although the Company received approval to market ALFERON N Injection for
the treatment of genital warts from the FDA in October 1989 and from the
comparable Mexican regulatory authority in December 1994, it has had only
limited revenue from the sale of ALFERON N Injection to date. In order for the
Company to operate profitably, the Company must sell significantly more ALFERON
N Injection. Increased sales will depend primarily upon the expansion of
existing markets and/or successful attainment of FDA approval to market ALFERON
N Injection for additional uses, of which there can be no assurance. See
"Products Under Development" below in this section. There can be no assurance
that sufficient quantities of ALFERON N Injection will be sold to allow the
Company to operate profitably. Moreover, the Company cannot market ALFERON N
Injection in other markets or for such other uses unless appropriate regulatory
approvals are obtained.
 
   
     FUTURE CAPITAL NEEDS; UNCERTAINTY OF ADDITIONAL FUNDING.  The Company will
require substantial funds to conduct research and development and preclinical
and clinical testing, to market its products, and, if it decides to do so, to
exercise an option, which becomes effective upon the sale of the minimum number
of shares of Common Stock in the Offering and is exercisable until December 31,
1996, to repurchase certain marketing rights from Purdue. The cash required to
exercise such option and to repurchase certain shares of Common Stock from
Purdue (which repurchase is required in connection with the exercise of the
option) is $5,000,000, subject to reduction under certain circumstances. See
"Business -- ALFERON N Injection -- Marketing and Distribution -- Agreements
with Purdue." For the three months ended March 31, 1995 and the years ended
December 31, 1994, 1993, and 1992, the cash utilized by the Company's operations
was approximately $1.7 million, $7.8 million, $7.8 million, and $4.4 million,
respectively. In January 1994, the Company amended certain agreements with
Purdue pursuant to which the Company agreed to bear the costs of conducting
clinical trials required to develop new indications for ALFERON N Injection,
most of which costs previously had been borne by Purdue. The Company's future
capital requirements will depend on many factors, including: continued
scientific progress in its drug development programs; the magnitude of these
programs; progress with preclinical testing 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; changes in its existing research relationships; the ability of the
Company to establish collaborative arrangements; and effective commercialization
activities and arrangements.
    
 
   
     Management believes that the cash currently available and the proceeds from
the Offering will be sufficient to enable the Company to continue operations for
approximately seven months from the date of this
    
 
                                        8
<PAGE>   11
 
   
Prospectus if the minimum number of shares of Common Stock is sold in the
Offering and 16 months if the maximum number is sold, although no assurance can
be given in this regard. To fund the Company's operations beyond such periods
and, if it decides to do so, to exercise the option to repurchase certain
marketing rights from Purdue and to repurchase certain shares of Common Stock
from Purdue, the Company will require additional funding, whether through
financial markets or collaborative or other arrangements with corporate partners
or from other sources, which may not be available when needed or on terms
acceptable to the Company. Insufficient funds will require the Company further
to delay, scale back, or eliminate certain or all of its research and
development programs or to license third parties to commercialize products or
technologies that the Company would otherwise seek to develop itself and may
cause the Company to be in default under its agreements with third parties. See
"Management's Discussion and Analysis of Financial Condition and Results of
Operations -- Liquidity and Capital Resources."
    
 
     NO GUARANTEED SOURCE OF REQUIRED MATERIALS.  The Company uses a number of
essential materials in the production of Natural Alpha Interferon, including
human white blood cells, and has limited sources from which to procure such
materials. The Company does not have long-term agreements for the supply of most
of such materials. There can be no assurance that long-term supply agreements
covering essential materials can be entered into on commercially reasonable
terms, if at all. Although the Company currently obtains human white blood cells
from several sources, the loss of any one source of supply could have a material
adverse effect on the Company. In such event, the Company may be required to
scale back its operations or stop manufacturing such product. The costs and
availability of products and materials required by the Company for the
commercial production of ALFERON N Injection and other products which the
Company may commercially produce are subject to fluctuation depending on a
variety of factors beyond the Company's control, including competitive factors,
changes in technology, and FDA and other governmental regulation and there can
be no assurance that the Company will be able to obtain such products and
materials on terms acceptable to the Company or at all.
 
     DEPENDENCE ON CERTAIN DISTRIBUTORS; LIMITED MARKETING PROGRAM.  The Company
currently has marketing arrangements for the distribution of ALFERON N Injection
in North America and several countries outside of North America. Unless the
Company enters into marketing arrangements with other companies or develops its
own sales force, the Company will be dependent on the ability of its current
distributors to sell sufficient quantities of ALFERON N Injection to allow the
Company to operate profitably. There can be no assurance that the Company will
be able to enter into any such marketing arrangements on acceptable terms, if at
all. See "Business -- ALFERON N Injection -- Marketing and Distribution" and
"Business -- Products under Development -- Marketing and Distribution."
 
     The Company has obtained an option, exercisable until December 31, 1996, to
reacquire from Purdue marketing rights for ALFERON N Injection in the United
States and Canada. The Company is exploring the possibility of entering into a
marketing arrangement with a new marketing partner for ALFERON N Injection in
the United States and Canada. However, there can be no assurance that a new
marketing partner will be found. If the Company exercises such option and
another such arrangement is not entered into, the Company would be left without
a marketing arrangement for ALFERON N Injection in the United States and Canada.
See "Business -- ALFERON N Injection -- Marketing and Distribution -- Agreements
with Purdue."
 
     PRODUCTS UNDER DEVELOPMENT.  The Company's products under development
include (i) expansion of the approved uses of ALFERON N Injection for the
potential treatment of HIV, hepatitis C, hepatitis B, multiple sclerosis,
cancers, and other indications, (ii) ALFERON N Gel for the potential treatment
of cervical dysplasia, recurrent genital herpes, other viral diseases, and
cancers, and (iii) ALFERON LDO for the potential treatment of certain symptoms
of patients infected with the HIV virus and the treatment of other viral
diseases. However, there can be no assurance that these products will be
cost-effective, safe, and effective treatments for these diseases, and there is
no assurance of receiving regulatory approvals to market these other products.
The Company cannot market such other products until such approvals are obtained.
Even if such approvals are obtained, there can be no assurance that any of these
products will be successful or will produce significant revenues or profits for
the Company. The ability of the Company to become profitable depends on the
successful commercial development of these products.
 
                                        9
<PAGE>   12
 
     POTENTIAL ADVERSE SIDE EFFECTS.  The Company is engaged in the manufacture
and sale of a single FDA approved product, ALFERON N Injection for the treatment
of refractory or recurring external genital warts in adults. In clinical trials
conducted for the treatment of genital warts with ALFERON N Injection, patients
have not experienced serious adverse side effects; however, there can be no
assurance that unexpected or unacceptable adverse side effects will not be found
in the future for this use or other potential uses of this product or for any
other product the Company might develop which could threaten or limit such
product's usefulness. See "Risk of Product Liability" below.
 
   
     SUBSTANTIAL COMPETITION.  In the United States, the Company currently
competes with Schering-Plough Corp.'s ("Schering") injectable recombinant
interferon product and other therapies in the treatment of genital warts. If and
when the Company obtains additional approvals of uses of its products, it
expects to compete primarily on the basis of product performance and price with
Schering and a number of additional pharmaceutical companies, both in the United
States and abroad, including Hoffmann, Roche, Amgen Inc., and Burroughs Wellcome
Co. The Company's potential competitors have developed or may develop products
(containing either alpha interferon or other therapeutic compounds) or other
treatment modalities for those uses. Many of the Company's potential competitors
are among the largest pharmaceutical companies in the world, are well known to
the public and the medical community, and have substantially greater financial
resources, product development, and manufacturing and marketing capabilities
than the Company or its marketing partners. Schering's recombinant interferon
product has achieved market dominance for the treatment of hepatitis C and
hepatitis B in the United States and other markets, and there can be no
assurance that if the Company is able to obtain regulatory approval of ALFERON N
Injection for the treatment of those diseases, it will be able to achieve any
significant penetration into those markets. In addition, because certain of the
competitive products are not dependent on a source of human blood cells, such
products may be able to be produced in greater volume and at a lower cost than
ALFERON N Injection and the Company's other Natural Alpha Interferon
formulations. Currently, the Company's wholesale price on a per unit basis of
ALFERON N Injection is substantially more than that of the competitive
recombinant alpha interferon products. Other companies may succeed in developing
products earlier than the Company, obtaining approvals for such products from
the FDA more rapidly than the Company, or developing products that are more
effective than those proposed to be developed by the Company. While the Company
will seek to expand its technological capabilities in order to remain
competitive, there can be no assurance that research and development by others
or other medical advances will not render the Company's technology or products
obsolete or non-competitive or result in treatments or cures superior to any
therapy developed by the Company, or that any therapy developed by the Company
will be preferred to any existing or newly developed technologies. See
"Business -- ALFERON N Injection -- Competition," "Business -- Products under
Development -- ALFERON N Gel," and "Business -- Products under
Development -- ALFERON LDO."
    
 
     POTENTIAL PATENT INFRINGEMENT CLAIMS.  On March 5, 1985, the United States
Patent and Trademark Office issued a patent to Hoffmann claiming purified human
alpha (leukocyte) interferon (regardless of how it is produced). On May 6, 1994,
the United States Patent and Trademark Office issued an Office Action in
Reexamination on the Hoffmann patent and rejected all of the 14 claims in the
Hoffmann patent. Claims in a patent under reexamination are valid and
enforceable until such time as a final disposition on the claims is reached. On
July 11, 1994, Hoffmann filed a response objecting to the Patent Office's
rejection of such claims. The outcome of such reexamination of the Hoffmann
patent cannot be determined at this time. Roche, the parent of Hoffmann, also
has been issued patents covering human alpha interferon in many countries
throughout the world. As of March 31, 1995, the Company obtained a non-exclusive
license from Hoffmann and Roche which grants the Company the worldwide rights to
make, use, and sell, without a potential patent infringement claim from Hoffmann
or Roche, any formulation of Natural Alpha Interferon. If Hoffmann's United
States patent is found to be invalid, the royalty payable by the Company to
Hoffmann and Roche on net sales of Natural Alpha Interferon products in the
United States would be eliminated, but potential competitors of the Company may
be more likely to enter the market. The license permits the Company to grant
marketing rights with respect to Natural Alpha Interferon products to third
parties, except that the Company cannot grant marketing rights with respect to
injectable products in any country in which Hoffmann or Roche has patent rights
covered by the license to any third party not listed on a schedule of
approximately 50 potential marketing partners without the consent of Hoffmann
and Roche, which consent cannot be
 
                                       10
<PAGE>   13
 
   
unreasonably withheld. There can be no assurance that the Company will not want
to grant such marketing rights to a third party not listed on such schedule, or
that Hoffmann and Roche will not withhold the required consent. In addition, if
such license were terminated, the Company may be subject to a patent
infringement lawsuit by Hoffmann and Roche if it continued to market Natural
Alpha Interferon products. If such a suit were brought, the Company would have
to either counterclaim to attempt to invalidate the Hoffmann and Roche patents
or prove that it did not infringe such patents. See "Business -- ALFERON N
Injection -- Patents and Licenses" and "Business -- ALFERON N
Injection -- Royalty Obligations."
    
 
     In addition, there may have been other patent applications filed in the
United States and in foreign countries, some of which may have been filed by
potential competitors of the Company, with respect to the technologies and/or
products which may be required by the Company to produce its current and
proposed products. If any of such patents issue in the United States or in
foreign countries in a form which covers the Company's products or processes,
the Company would be required to obtain licenses under such patents in
connection with the domestic and international commercialization of such
products. There can be no assurance that the Company could obtain licenses under
any of such patents if so issued, particularly if they were issued to companies
directly in competition with the Company, or that, even if the Company could
obtain licenses, it could do so on commercially reasonable terms.
 
     If the sale or use of any of the Company's products were to become the
basis of a patent infringement lawsuit, assuming the Company could not obtain a
license on satisfactory terms, the Company may be required to incur substantial
litigation expenses, and such litigation could also consume substantial
management time, which could have a material adverse effect upon the financial
condition of the Company even if it were to be successful in the litigation. If
the Company proved unsuccessful in such litigation, it may be required to pay a
royalty for the use of the claimed patents or cease producing the products and
redevelop the products in such a way as to avoid infringing any claimed patent
rights. There can be no assurance in such case that the Company could obtain a
license under such patents on commercially reasonable terms or at all, or that
it could successfully redevelop the products to fall outside the scope of the
claim.
 
     It is the Company's policy to seek licenses if it believes that the terms
of such licenses, when weighed against the expense and uncertainties of
potential litigation, are cost effective.
 
     POSSIBLE INABILITY TO PROTECT TECHNOLOGY.  To a significant extent, the
ability of the Company to protect its rights in any products or technology it
may develop depends upon its ability to obtain suitable patent or similar
protection. The ability of the Company to obtain patents, and the nature,
extent, and enforceability of the intellectual property rights that are obtained
as a result of the Company's research, involve complex legal and factual issues.
New technology and products developed by the Company may not qualify for patent
protection or, if they do qualify, may be subject to challenge or to protracted
judicial proceedings. In addition, the Company may determine not to seek
additional patent or other protection for its technology or products. It is not
certain that other patents will be issued or, if issued, that they will afford
the Company protection from competitive products. Although the Company's
practice is to require its technical and scientific employees and consultants to
execute confidentiality agreements covering proprietary information, there can
be no assurance that others will not independently make similar discoveries or
otherwise obtain access to proprietary information of the Company. In addition,
the Company has a non-exclusive license agreement with Hoffmann and Roche which
enables the Company to sell its products. There can be no assurance that
Hoffmann or Roche has not granted or will not grant a similar license to another
company with considerably greater financial, technical, and marketing resources
than the Company or that Hoffmann or Roche will not enter the market itself with
a competitive product.
 
     While the Company has several patent applications pending, it does not
currently have significant patent protection for its products or technology. In
addition, even if such protection were obtained, it is possible that others have
or may develop equivalent or superior products or technologies which would not
fall within the scope of the Company's patent claims or which might involve
inventions similar in scope to those of the Company for which patent or similar
rights are obtained by others prior to the time that the Company is able to do
so. See "Business -- ALFERON N Injection -- Patents and Licenses" and
"Business -- Products under Development -- Patents and Licenses."
 
                                       11
<PAGE>   14
 
   
     REGULATORY APPROVALS.  The production and marketing of the Company's
products in the United States, as well as its ongoing research and development
activities, are subject to regulation by governmental agencies, most
significantly the FDA. Such regulation includes requirements for obtaining FDA
approval prior to marketing each of its products in the United States. In order
to obtain such FDA approval, the Company must demonstrate, among other things,
the safety and efficacy of each product through pre-clinical and clinical
testing. Obtaining such approvals is a time-consuming process and requires the
expenditure of substantial resources. Each facility in which the products are
produced and packaged, whether operated by the Company or a third party, must
meet the FDA's standards for current good manufacturing practices and must also
be approved prior to marketing any product produced or packaged in such
facility. Any significant change in the production process which may be
commercially required, including changes in sources of certain raw materials, or
any change in the location of the production facilities will also require FDA
approval. To the extent a portion of the manufacturing process for a product is
handled by an entity other than the Company, the Company must similarly receive
FDA approval for the participation by such third party in the manufacturing
process. For example, the Company has entered into an agreement with Sanofi
pursuant to which Sanofi formulates and packages ALFERON N Injection. The
Company presently has a biologic establishment license for the facilities in
which it produces ALFERON N Injection, which includes the facilities in which
Sanofi formulates and packages ALFERON N Injection. If the Company's present
manufacturing facilities were damaged or destroyed or the Company's arrangements
with Sanofi were terminated, there can be no assurance that FDA approval could
be obtained for another facility or that another facility could be built and
approved on a timely basis or on commercially reasonable terms. Delays in
obtaining, or the failure to obtain, any necessary regulatory approvals could
have a material adverse effect on the Company's ability to develop, produce, and
sell its products. In addition, failure of the Company to comply in any respect
with FDA requirements with respect to the production and marketing of drug
products can subject the Company to potential civil and criminal penalties and
its products to seizure and other civil enforcement action. Because of the
uncertain nature of many of these requirements, there can be no assurance that
regulatory problems of this type will not occur. See "Business -- Governmental
Regulation."
    
 
     FOREIGN REGULATORY APPROVALS.  To market its products outside of the United
States, the Company is 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. At present, foreign marketing authorizations are applied for at a
national level, although certain registration procedures are available within
the European Union (the "EU") to companies wishing to market a product in more
than one EU member country. If a regulatory authority is satisfied that adequate
evidence of safety, quality, and efficacy has been presented, marketing
authorization is usually granted. The foreign regulatory approval process
includes all of the risks associated with obtaining FDA approval set forth
above. Approval by the FDA does not ensure approval by other countries. There
can be no assurance that the Company's products will receive such approvals. In
addition, in most cases, the Company may not export its products for commercial
sale for any use other than an FDA-approved use except that the FDA may under
certain circumstances authorize exportation of such products to one or more of
21 specifically-approved countries. However, these FDA export restrictions
generally do not apply if the Company's products are manufactured outside the
United States. At the present time, the Company does not have any foreign
manufacturing facilities.
 
     In May 1990, the Company's licensee applied for a product license in the
United Kingdom for the use of ALFERON N Injection for the intralesional
treatment of refractory or recurring external genital warts in patients 18 years
of age or older. In October 1991, the Committee on Safety of Medicines informed
the Company's licensee that it might be unable to advise the Licensing Authority
to grant a product license. Subsequent oral and written representations made by
the Company to the Committee resolved certain of the issues raised by the
Committee, but the Committee believed that additional information and possibly
clinical work would be necessary to resolve certain other quality and safety
issues and determined to advise the Licensing Authority not to grant a product
license at that time. The Company's licensee was entitled to appeal this
recommendation and has done so. The Company can appear before or make written
representations to the Committee about such advice, but has not done so because
of a lack of funds. The Company is
 
                                       12
<PAGE>   15
 
considering whether to continue to pursue this appeal or to have the Company's
licensee withdraw the product license application. The Company could submit a
new application for the same use or for another use if and when sufficient
clinical data is available. There can be no assurance, however, that approval of
the use of ALFERON N Injection for the treatment of genital warts or any other
indication will be obtained even if it is pursued.
 
     UNCERTAINTY OF PHARMACEUTICAL PRICING AND RELATED MATTERS; NEED FOR
REIMBURSEMENT.  The future revenues and profitability of, and availability of
capital for, biotechnology companies may be affected by the continuing efforts
of governmental and third-party payors to contain or reduce the costs of health
care through various means. For example, in certain foreign markets, the pricing
and profitability of prescription pharmaceuticals is subject to government
control. In Japan, which is currently the world's largest market for interferon
products, the government imposed price cuts ranging from 13.5% to 22.7% in 1994
on certain interferon products then being marketed in Japan. The Company cannot
predict whether similar price cuts will be imposed on any of the Company's
products in Japan or in any other country at such time as such products are
being marketed in such country or the size or duration of any cuts that may be
imposed. However, there can be no assurance that any such cuts will not have a
material adverse effect on the Company's future results of operations. There
have been, and the Company expects there to continue to be, a number of United
States federal and state proposals to implement similar government control. It
is uncertain what form any health care reform legislation may take or what
actions the federal, state, and private payors may take in response to the
suggested reforms. The Company cannot predict when any suggested reforms will be
implemented, if ever, or the effect of any implemented reform on the Company's
business. There can be no assurance, however, that any implemented reform will
not have a material adverse effect on the Company's future results of
operations. The Company's long-term ability to market its products successfully
may depend in part on the extent to which reimbursement for the cost of such
products and related treatment will be available from public and private health
insurers and other organizations. Third-party payors are increasingly
challenging the prices of medical products and services. The reimbursement
status of newly-approved health care products is highly uncertain, and there can
be no assurance that third-party coverage will be available or that available
third-party coverage will enable the Company to maintain price levels sufficient
to realize an appropriate return on its investment in product development. While
recombinant alpha interferon products can be produced at a lower cost per unit
than the Company's formulations of Natural Alpha Interferon products, until dose
regimens and treatment durations are determined, the Company is unable to
determine whether the cost of treatment with the Company's products will be
greater, equal to, or less than the cost of competing treatments.
 
     ROYALTY OBLIGATIONS.  The Company is a party to certain license agreements
pursuant to which it is obligated to pay royalties based upon the commercial
exploitation of its products. Royalty payments under such license agreements
with respect to ALFERON N Injection, ALFERON N Gel, and ALFERON LDO could
aggregate up to 9.5%, 13.5%, and 19.5%, respectively, of the Company's net sales
of such products. See "Business -- ALFERON N Injection -- Royalty Obligations"
and "Business -- Products under Development -- Royalty Obligations." In
addition, under the terms of a marketing agreement, the Company may be obligated
to pay an additional royalty equal to a maximum of 3% of the net sales of
ALFERON N Injection in certain territories. See "Business -- ALFERON N
Injection -- Marketing and Distribution." Such royalty obligations, together
with any additional royalties which may be payable by the Company, may limit the
Company's marketing strategies and prevent it from obtaining adequate profit
margins and could have a material adverse effect on the commercial exploitation
of the Company's products.
 
     In connection with the acquisition of certain intellectual property and
technology rights from NPDC, the Company agreed to pay NPDC a royalty of $1
million. Such amount is payable if and when the Company generates income before
income taxes, limited to 25% of such income before income taxes per year until
such amount is paid in full. See "Certain Transactions -- Agreements with
NPDC -- Transfer Agreement."
 
     LIMITED PRODUCTION EXPERIENCE.  Although the Company has produced ALFERON N
Injection in accordance with its commercial requirements, it has never produced
ALFERON N Injection at levels which would allow the Company to operate
profitably. There can be no assurance that, if the Company's commercial
 
                                       13
<PAGE>   16
 
requirements increase to such levels, the Company will be able to produce
ALFERON N Injection at such levels and at a competitive price.
 
     RISK OF PRODUCT LIABILITY.  The Company's products have undergone or will
undergo extensive clinical testing prior to the granting of any regulatory
approval for the purpose, among other things, of determining the safety of such
products. The Company may sell products which cause unexpected adverse reactions
or result in an allergic or other reaction or which are alleged to have
unacceptable adverse side effects. Product liability risk is inherent in the
testing, manufacture, marketing, and sale of the Company's products, and there
can be no assurance that the Company will be able to avoid significant product
liability exposure. Such liability might result from claims made directly by
consumers or by pharmaceutical companies or others selling such products. It is
impossible to predict the scope of injury or liability from such unexpected
reactions, or the measure of damages which might be imposed as a result of any
claims or the cost of defending such claims. The Company has a product liability
insurance policy in the amount of $10,000,000. Although the Company believes
this amount is sufficient, there is no assurance that the Company will be able
to maintain such coverage, and even if it does maintain it, in the event that
the Company becomes subject to liability claims in excess of any insurance
coverage it may have in effect, the Company may not have sufficient assets or
liquidity to satisfy such claims which could result in the Company's inability
to continue its operations. Furthermore, any published reports or rumors
suggesting a link between a Company product and injury to a person could be
expected to materially impair the Company's ability to market such product.
 
     RETENTION OF KEY PERSONNEL.  Because of the specialized scientific nature
of the Company's business, it is necessary to attract and retain personnel with
a wide variety of scientific capabilities. Competition for such personnel is
intense. There can be no assurance that the Company will continue to attract and
retain personnel of high scientific caliber. None of the Company's key employees
have employment agreements. The Company does not maintain key man life insurance
for any of its key employees and does not intend to obtain such insurance. The
Company's loss of services of certain of its employees or other members of its
staff could have a material adverse effect on the Company's operations. See
"Business -- Research Staff and Employees" and "Management."
 
   
     CONTROL BY PRINCIPAL STOCKHOLDERS; CONFLICTS OF INTEREST.  Based, in part,
on a Schedule 13D filed by the beneficial owner with the Securities and Exchange
Commission, NPDC, David Blech, five trusts of which Mr. Blech is the income
beneficiary but not the trustee (the "Blech Trusts"), and Biotechnology
Investment Group L.L.C. beneficially own approximately 31.1%, 3.6%, 10.9%, and
11.3%, respectively, of the outstanding shares of Common Stock, certain of which
shares have been pledged to their respective banks as collateral to secure
indebtedness owed to such banks. Upon completion of the Offering of the minimum
number of shares of Common Stock and after giving effect to the purchase of the
Principal Stockholder Shares, such stockholders beneficially will own
approximately 25.8%, 2.8%, 8.7%, and 9.4%, respectively, of the then outstanding
shares of Common Stock.
    
 
     Certain conflicts of interest may arise as a result of NPDC's stock
ownership in the Company and certain related transactions between the Company
and NPDC. Furthermore, certain officers of the Company also serve as officers of
NPDC and may have conflicts of interests in allocating management time,
services, and functions between the Company and NPDC. Presently, Samuel H.
Ronel, Ph.D., President and Chief Executive Officer, Stanley G. Schutzbank,
Ph.D., Executive Vice President, Lawrence M. Gordon, Vice President and General
Counsel, Drew R. Stoudt, Vice President Regulatory Affairs and Quality, and
Donald W. Anderson, Controller, devote a portion of their time to the business
of NPDC, which includes some overlapping responsibilities for the benefit of the
Company. In addition, certain directors of NPDC also serve as directors of the
Company. Transactions in which certain members of the Board of Directors or
principal stockholders of the Company may have a conflict of interest must be
approved by a majority of the disinterested directors. See "Principal
Stockholders," "Certain Transactions," "Description of Securities," and
"Business -- ALFERON N Injection -- Marketing and Distribution -- Agreements
with Purdue."
 
     PREFERRED STOCK.  The Company's charter provides for 5,000,000 authorized
but unissued shares of Preferred Stock, the rights, preferences, qualifications,
limitations, and restrictions of which may be fixed by
 
                                       14
<PAGE>   17
 
the Board of Directors without any further vote or action by the stockholders.
The ability to issue the Preferred Stock could have the effect of delaying,
deferring, or preventing a change of control of the Company.
 
   
     SHARES AVAILABLE FOR FUTURE SALE; UNDERWRITER'S PURCHASE OPTIONS.  The
Company, the Company's directors and officers (who own in the aggregate 17,600
shares of Common Stock and options and warrants to purchase 1,912,000 shares of
Common Stock), and the Company's principal stockholders (who after consummation
of the Offering will own in the aggregate 13,523,816 shares of Common Stock and
no options and warrants to purchase shares of Common Stock), have agreed
(subject to certain exceptions) not to sell, directly or indirectly, any of
their shares of Common Stock for periods ranging from six to 24 months following
the date of this Prospectus, without the consent of the Underwriter and the
Company. However, certain of such principal stockholders have pledged an
aggregate of 9,502,148 shares of Common Stock beneficially owned by them to
their respective banks as collateral to secure indebtedness owed to such banks.
Any shares acquired by lenders pursuant to such pledge arrangements would not be
subject to any agreements not to sell. In addition, any shares held by a
principal stockholder who was in bankruptcy proceedings might be released, in
the discretion of the bankruptcy court, from any agreement not to sell.
Moreover, the Underwriter and the Company may, in their sole discretion and at
any time without notice, release all or any portion of the securities subject to
agreements not to sell. On the expiration of the agreements not to sell, and
subject to the pledge arrangements, the principal stockholders may sell certain
of the shares of Common Stock held by them pursuant to Rule 144 under the
Securities Act of 1933 (the "Securities Act") or otherwise. In addition, certain
of the principal stockholders have certain demand registration rights with
respect to the Common Stock beneficially owned by them. The sale of a
significant number of shares of Common Stock, whether by the principal
stockholders, the lenders pursuant to such pledge arrangements, or otherwise,
may adversely affect the market price of the Common Stock. See "Principal
Stockholders," "Certain Transactions," and "Underwriting."
    
 
   
     The Company currently has outstanding options to purchase 2,864,350 shares
and warrants to purchase 886,000 shares of Common Stock. Moreover, the Company
will sell to the Underwriter and/or its designees, for nominal consideration,
the Underwriter's Purchase Options to purchase up to 1,123,332 shares of Common
Stock. For the life of the outstanding options and warrants and the
Underwriter's Purchase Options, the holders are given, at nominal cost, the
opportunity to profit if the price for the Common Stock in the public market
exceeds the exercise price of the options, warrants, or Underwriter's Purchase
Options, without assuming the risk of ownership, with a resulting dilution in
the interest of other security holders. If the public market price of the Common
Stock does not rise above the exercise price of the options, warrants, or
Underwriter's Purchase Options during the exercise period, then such securities
will expire worthless. As long as the outstanding options, warrants, and the
Underwriter's Purchase Options remain unexercised, the terms under which the
Company could obtain additional capital may be adversely affected. Moreover, the
holders of these securities may be expected to exercise them at a time when the
Company would, in all likelihood, be able to obtain any needed capital by a new
offering of its securities on terms more favorable than those provided by these
securities.
    
 
     In addition, if the Company exercises its option to repurchase certain
marketing rights from Purdue, the Company will issue up to 750,000 shares of
Common Stock to Purdue which the Company has agreed to utilize its best efforts
to ensure will be registered and freely tradeable. See "Business -- ALFERON N
Injection -- Marketing and Distribution -- Agreements with Purdue."
 
     VOLATILITY OF SHARE PRICE; LACK OF LIQUIDITY.  There has been significant
volatility in the market prices for publicly traded shares of biotechnology
companies, including the Company. There can be no assurance that the price of
the Common Stock will remain at or exceed current levels. Factors, such as
announcements of technological or product developments by the Company or its
competitors, governmental regulation, or patent or proprietary rights
developments may have a significant impact on the market price of the Common
Stock.
 
   
     DILUTION.  Based on the net tangible book value per share of the Common
Stock as of March 31, 1995, investors in the Offering will experience
substantial dilution of $.80 per share if the minimum number of
    
 
                                       15
<PAGE>   18
 
   
shares is sold and $.69 per share if the maximum number of shares is sold, from
an assumed offering price of $1.20 per share. See "Dilution."
    
 
     DIVIDENDS ON COMMON STOCK UNLIKELY.  The Company does not, in the
foreseeable future, anticipate paying any dividends on the Common Stock. See
"Price Range of Common Stock and Dividend Policy."
 
     NO MARKET MAKING ACTIVITY BY UNDERWRITER.  The Underwriter has indicated
that it does not intend to act as a market maker in the Common Stock, which may
adversely affect the price and liquidity of the Common Stock. While 15 firms
currently make a market in the Common Stock, all or some of such firms may
discontinue such activities at any time or from time to time.
 
     LIMITED UNDERWRITING HISTORY.  The Underwriter was first registered as a
broker-dealer in February 1992 and has not previously participated in any public
offerings as an underwriter, though it has acted as syndicate member, sole
placement agent, co-placement agent, selected dealer, or sole participating
broker in more than a dozen public or private offerings. Prospective purchasers
of the Common Stock offered hereby should consider the Underwriter's limited
experience in evaluating an investment in the Common Stock. See "Underwriting."
 
                                       16
<PAGE>   19
 
                                USE OF PROCEEDS
 
   
     The net proceeds to the Company from the sale of the Common Stock offered
hereby are estimated to be $6,633,200 if the minimum number of shares are sold
and $12,542,000 if the maximum number are sold, assuming that the offering price
of the Common Stock is $1.20 per share.
    
 
   
     The Company anticipates that of the estimated net proceeds of $6,633,200 if
the minimum number of shares are sold, it will use approximately $3,000,000 for
research, product development, and clinical trials of the Company's products,
approximately $1,600,000 to repay indebtedness, and the balance for working
capital and general corporate purposes. The Company anticipates that of the
estimated net proceeds of $12,542,000 if the maximum number of shares are sold,
it will use approximately $7,000,000 for research, product development, and
clinical trials of the Company's products, approximately $1,600,000 to repay
indebtedness to certain principal stockholders, and the balance for working
capital and general corporate purposes. The indebtedness to be repaid bears
interest at prime plus 2% and matures on the earlier of (i) the first date that
the Company receives gross proceeds of at least $7,500,000 from a public
offering of Common Stock and (ii) November 2, 1995. Such indebtedness was
incurred in May and July 1995 and the proceeds of such indebtedness were used
for working capital. Certain holders of such indebtedness have agreed to invest
$920,000 in the Offering to purchase the Principal Stockholder Shares. See
"Certain Transactions -- Other Transactions." The Company reserves the right to
reapportion the net proceeds of the Offering among the foregoing categories or
to other uses if it determines that to do so would be in the best interests of
the Company.
    
 
     Until utilized, the proceeds of the Offering are expected to be invested
principally in short- and medium-term, interest-bearing investments.
 
                PRICE RANGE OF COMMON STOCK AND DIVIDEND POLICY
 
     The Common Stock is traded in the over-the-counter market and is quoted on
the NASDAQ National Market System under the symbol IFSC. The following table
sets forth for each period indicated the high and low sales prices for the
Common Stock as reported on the NASDAQ National Market System.
 
   
<TABLE>
<CAPTION>
                                                                            HIGH    LOW
                                                                            ---     ---
        <S>                                                                 <C>     <C>
        1993
             First Quarter................................................  $ 315/16 $ 21/8
             Second Quarter...............................................    53/4    17/8
             Third Quarter................................................    51/8    33/8
             Fourth Quarter...............................................    61/4    43/8
 
        1994
             First Quarter................................................    53/8    35/8
             Second Quarter...............................................    41/8    23/4
             Third Quarter................................................    37/8    11/2
             Fourth Quarter...............................................    25/8    11/4
 
        1995
             First Quarter................................................    3       1 /16
             Second Quarter...............................................    21/2    1  /16
             Third Quarter (through July 31, 1995)........................    21/16   13/4
</TABLE>
    
 
   
     On July 31, 1995, the last reported sale price of the Common Stock was
$1 15/16 per share. As of July 31, 1995, the Company had approximately 857
stockholders of record.
    
 
     The Company has not paid any dividends on the Common Stock since its
inception and does not contemplate paying dividends on the Common Stock in the
foreseeable future.
 
                                       17
<PAGE>   20
 
                                 CAPITALIZATION
 
   
     The following table sets forth the capitalization of the Company as of
March 31, 1995 and as adjusted to give effect to (i) the sale of the minimum and
maximum number of shares of Common Stock in the Offering, (ii) the termination
of the commitment to repurchase 619,994 shares of Common Stock held by Purdue,
and (iii) the $125,000 writedown of March 31, 1995 inventory resulting from the
July 1995 agreement with Purdue that the transfer price for each vial of ALFERON
N Injection sold to Purdue will be paid $25 in cash and the balance as an offset
to the cash exercise price of the Company's option to reacquire certain
marketing rights from Purdue (assuming that the offering price of the Common
Stock is $1.20 per share and assuming no other changes in the net tangible book
value after March 31, 1995). See "Management's Discussion and Analysis of
Financial Condition and Results of Operations -- Liquidity and Capital
Resources," "Business -- ALFERON N Injection  -- Marketing and
Distribution -- Agreements with Purdue," and "Certain Transactions -- Other
Transactions."
    
 
   
<TABLE>
<CAPTION>
                                                             MARCH 31, 1995 (UNAUDITED)
                                                   ----------------------------------------------
                                                                             AS ADJUSTED
                                                                    -----------------------------
                                                      ACTUAL          MINIMUM          MAXIMUM
                                                   ------------     ------------     ------------
<S>                                                <C>              <C>              <C>
Short-term debt:
  Current maturities of long-term debt(1)........  $    274,370     $    274,370     $    274,370
                                                    ===========      ===========      ===========
Common Stock subject to repurchase commitment
  (682,494 shares and 62,500 shares as
  adjusted)(2)...................................     2,729,976          250,000(3)       250,000(3)
Stockholders' equity:
  Preferred Stock, par value $.01 per share,
     5,000,000 shares authorized; none issued and
     outstanding.................................            --               --               --
  Common Stock, par value $.01 per share,
     40,000,000 shares authorized; 21,023,774
     shares issued and outstanding and 28,143,768
     shares and 33,643,768 shares issued and
     outstanding, as adjusted(4).................       210,238          281,438          336,438
Capital in excess of par value...................    67,039,598       76,081,574       81,935,374
Accumulated deficit..............................   (64,586,010)     (64,711,010)     (64,711,010)
                                                   ------------     ------------     ------------
          Total stockholders' equity.............  $  2,663,826     $ 11,652,002     $ 17,560,802
                                                   ------------     ------------     ------------
  Total capitalization...........................  $  5,393,802     $ 11,902,002     $ 17,810,802
                                                    ===========      ===========      ===========
</TABLE>
    
 
- ---------------
(1) See Note 9 of "Notes to Consolidated Financial Statements." This loan was
    repaid in April, 1995.
 
   
(2) Represents the Company's obligation to purchase an aggregate of 682,494
    shares of Common Stock from Purdue, of which 62,500 shares were required to
    be repurchased in April 1995 and 619,994 shares are required to be
    repurchased on August 31, 1995 (or such earlier date on which the Offering
    shall terminate prior to the sale of the minimum number of shares of Common
    Stock). Upon the sale of the minimum number of shares of Common Stock in the
    Offering, the repurchase of the 62,500 shares will be completed and the
    commitment to repurchase the 619,994 shares will terminate. However, the
    Company will still have the obligation to repurchase the 619,994 shares from
    Purdue if the Company decides to exercise an option, which becomes effective
    upon the sale of the minimum number of shares of Common Stock in the
    Offering and is exercisable until December 31, 1996, to repurchase certain
    marketing rights from Purdue. See "Management's Discussion and Analysis of
    Financial Condition and Results of Operations -- Liquidity and Capital
    Resources" and "Business -- ALFERON N Injection -- Marketing and
    Distribution -- Agreements with Purdue."
    
 
   
(3) Consists of 62,500 shares of Common Stock required to be repurchased from
    Purdue in April 1995, which repurchase was completed in July 1995.
    
 
   
(4) Does not include (i) 2,864,350 shares of Common Stock reserved for issuance
    upon the exercise of options currently outstanding under the Company's stock
    option plan, (ii) 886,000 shares reserved for issuance upon the exercise of
    currently outstanding warrants, and (iii) 1,123,332 shares reserved for
    issuance upon the exercise of the Underwriter's Purchase Options. See
    "Underwriting" and "Description of Securities."
    
 
The Company has no material long-term lease obligations.
 
                                       18
<PAGE>   21
 
                                    DILUTION
 
   
     As of March 31, 1995, the net tangible book value of the Company was
$2,314,202 (after giving effect to the commitment to repurchase Common Stock
from Purdue), or $.11 per share of Common Stock outstanding. Net tangible book
value per share is determined by dividing the tangible net worth of the Company
(tangible assets less liabilities) by the number of shares of Common Stock
outstanding, net of shares of Common Stock subject to repurchase commitment.
After giving effect to the sale of the minimum number of shares in the Offering
and the transactions described in footnote 3 (assuming that the offering price
of the Common Stock is $1.20 per share and assuming no other changes in the net
tangible book value after March 31, 1995), the pro forma net tangible book value
of the Company as of March 31, 1995 would have been $11,302,378 ($17,211,178 if
the maximum number of shares are sold in the Offering) or $.40 ($.51 if the
maximum number of shares are sold in the Offering) per share. This represents an
immediate increase in pro forma net tangible book value of $.29 ($.40 if the
maximum number if shares are sold in the Offering) per share to current
stockholders and an immediate dilution of $.80 ($.69 if the maximum number of
shares are sold in the Offering) per share to new investors purchasing shares of
Common Stock.
    
 
     The following table summarizes such per share dilutive effect:
 
   
<TABLE>
<CAPTION>
                                                                   MINIMUM            MAXIMUM
                                                                --------------     --------------
<S>                                                             <C>      <C>       <C>      <C>
Assumed offering price(1).....................................           $1.20              $1.20
  Net tangible book value per share before the Offering.......  $.11               $.11
  Increase attributable to shares offered hereby(2)(3)........   .29                .40
                                                                ----               ----
Pro forma net tangible book value per share after the Offering
  and the transactions described in footnote 3................             .40                .51
                                                                         -----              -----
Dilution to new investors(4)..................................           $ .80              $ .69
                                                                         =====              =====
</TABLE>
    
 
- ---------------
 
(1) Before deduction of underwriting discounts and commissions and estimated
    offering expenses to be paid by the Company.
 
(2) After deduction of underwriting discounts and commissions and estimated
    offering expenses to be paid by the Company.
 
   
(3) Also gives effect to (i) the termination of the commitment to repurchase
    619,994 shares of Common Stock held by Purdue and (ii) the $125,000
    writedown of March 31, 1995 inventory resulting from the July 1995 agreement
    with Purdue that the transfer price for each vial of ALFERON N Injection
    sold to Purdue will be paid $25 in cash and the balance as an offset to the
    cash exercise price of the Company's option to reacquire certain marketing
    rights from Purdue. See "Capitalization," "Management's Discussion and
    Analysis of Financial Condition and Results of Operations -- Liquidity and
    Capital Resources," and "Business -- ALFERON N Injection -- Marketing and
    Distribution -- Agreements with Purdue."
    
 
(4) Dilution represents the difference between the offering price per share and
    the pro forma net tangible book value per share after giving effect to the
    Offering and the transactions described in footnote 3.
 
                                       19
<PAGE>   22
 
                         SELECTED FINANCIAL INFORMATION
 
     The following table sets forth the selected financial data of the Company
as of March 31, 1995 and December 31, 1994, 1993, 1992, 1991, and 1990, and for
the three months ended March 31, 1995 and 1994 and for the years ended December
31, 1994, 1993, 1992, 1991, and 1990, and should be read in conjunction with the
consolidated financial statements and notes thereto contained elsewhere in this
Prospectus. The financial data as of March 31, 1995 and for the three months
ended March 31, 1995 and March 31, 1994 are unaudited and reflect all
adjustments (consisting solely of normal recurring adjustments) which are, in
the opinion of management, necessary to present fairly the data as of such date
and for such periods. The results for interim periods are not necessarily
indicative of results to be expected for the year. The financial data as of and
for the five-year period ended December 31, 1994 have been derived from the
audited financial statements of the Company.
 
<TABLE>
<CAPTION>
                                                        THREE MONTHS
                                                            ENDED
                                                          MARCH 31,                     YEAR ENDED DECEMBER 31,
                                                      -----------------    -------------------------------------------------
                                                       1995      1994        1994       1993      1992      1991      1990
                                                      -------   -------    --------    -------   -------   -------   -------
                                                                       (IN THOUSANDS EXCEPT PER SHARE DATA)
<S>                                                   <C>       <C>        <C>         <C>       <C>       <C>       <C>
STATEMENT OF OPERATIONS DATA:
Revenues(1).........................................  $   180   $     1    $  1,166    $    51   $ 3,306   $ 2,503   $   622
Research and development costs, net.................      960     1,169       5,196      4,151     3,983     3,162     5,596
General and administrative expense..................      446       740       4,974(2)   2,367     2,113     1,872     1,840
Loss from operations................................   (1,795)   (2,371)    (11,782)    (8,347)   (5,953)   (5,087)   (7,579)
Interest and other income (expense), net............       (3)       25        (295)      (113)      (44)     (809)     (735)
Net loss............................................   (1,798)   (2,346)    (12,078)    (8,460)   (5,997)   (5,896)   (8,314)
Net loss per share of common stock..................     (.08)     (.12)       (.62)      (.55)     (.42)     (.62)    (1.34)
Dividends...........................................       --        --          --         --        --        --        --
Weighted average number of shares of Common Stock
  outstanding.......................................   21,199    19,417      19,594     15,432    14,357     9,501     6,212
</TABLE>
 
<TABLE>
<CAPTION>
                                                           MARCH 31,                  YEAR ENDED DECEMBER 31,
                                                         -------------    ------------------------------------------------
                                                             1995           1994      1993      1992      1991      1990
                                                         -------------    --------   -------   -------   -------   -------
                                                                       (IN THOUSANDS EXCEPT PER SHARE DATA)
<S>                                                         <C>           <C>        <C>       <C>       <C>       <C>
BALANCE SHEET DATA:
Total assets...........................................     $ 7,786       $  8,182   $20,301   $21,096   $25,035   $12,001
Current maturities of long-term debt...................         274            409     1,999     2,001     1,188       195
Long-term debt, net of current maturities..............          --             --       138     1,679     3,680     4,409
Common Stock subject to repurchase commitment(3).......       2,730          2,730        --        --        --        --
Working capital (deficiency)...........................        (907)          (782)    7,985     7,706    12,002    (2,298)
Stockholders' equity...................................       2,664          2,979    17,131    16,157    19,045       608
</TABLE>
 
- ---------------
(1) Substantially all of the revenues in 1991, 1992, 1994 and the three months
    ended March 31, 1995 were from sales of ALFERON N Injection to Purdue.
    Purdue did not purchase ALFERON N Injection from the Company in 1993 or the
    three months ended March 31, 1994. Purdue has informed the Company that
    during 1993, 1994 and the three months ended March 31, 1995, Purdue sold
    approximately 23,000, 25,000, and 6,800 vials, respectively, and distributed
    as free samples approximately 2,800, 2,000, and 200 vials, respectively, of
    ALFERON N Injection from its inventory. See "Management's Discussion and
    Analysis of Financial Conditions and Results of Operations -- Liquidity and
    Capital Resources."
 
(2) Includes $2,100,000 resulting from the write-off of certain prepaid
    royalties. See Note 4 of "Notes to Consolidated Financial Statements."
 
   
(3) Represents the Company's obligation to purchase an aggregate of 682,494
    shares of Common Stock from Purdue, of which 62,500 shares were required to
    be repurchased in April 1995 and 619,994 shares are required to be
    repurchased on August 31, 1995 (or such earlier date on which the Offering
    shall terminate prior to the sale of the minimum numbers of shares of Common
    Stock). Upon the sale of the minimum number of shares of Common Stock in the
    Offering, the repurchase of the 62,500 shares will be completed and the
    commitment to repurchase the 619,994 shares will terminate. However, the
    Company will still have the obligation to repurchase the 619,994 shares from
    Purdue if the Company decides to exercise an option, which becomes effective
    upon the sale of the minimum number of shares of Common Stock in the
    Offering and is exercisable until December 31, 1996, to repurchase certain
    marketing rights from Purdue. See "Management's Discussion and Analysis of
    Financial Condition and Results of Operations -- Liquidity and Capital
    Resources" and "Business -- ALFERON N Injection -- Marketing and
    Distribution -- Agreements with Purdue."
    
 
                                       20
<PAGE>   23
 
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
     Since January 1981, the Company has been primarily engaged in the research
and development of pharmaceutical products containing Natural Alpha Interferon
for the treatment of viral diseases, cancers, and diseases of the immune system.
The Company has experienced significant operating losses since its inception.
Although the Company received FDA approval in October 1989 to market ALFERON N
Injection in the United States for the treatment of certain genital warts, it
has had limited revenues from the sale of ALFERON N Injection to date. ALFERON N
Injection currently is marketed and sold in the United States by Purdue and was
approved for sale in Mexico in December 1994. In order for the Company to
operate profitably, the Company must sell significantly more ALFERON N
Injection. Increased sales will depend primarily upon the expansion of existing
markets and/or successful attainment of FDA approval to market ALFERON N
Injection for additional uses. The Company has primarily financed its operations
to date through private placements and public offerings of the Company's
securities.
 
LIQUIDITY AND CAPITAL RESOURCES
 
   
     As of August   , 1995, the Company had an aggregate of $          in cash.
Consequently, management is actively pursuing raising required additional
capital by taking one or more of the following actions: (i) issuing securities
in a public or private equity offering, (ii) licensing rights to its injectable,
topical, or oral formulations of alpha interferon (as it did with Fujimoto
Diagnostics, Inc. ("Fujimoto") as described below), or (iii) entering into
collaborative or other arrangements with corporate partners. Lack of funds has
caused the Company to delay or scale back some of its clinical activities and
continued lack of funding will require the Company to eliminate certain or all
of its activities or license third parties to commercialize products or
technologies that the Company would otherwise seek to develop itself.
    
 
   
     On May 3, 1995, three principal stockholders of the Company committed to
loan the Company an aggregate of $920,000, all of which was received by July 6,
1995. Such loans bear interest at prime plus 2% and mature on the earlier of (i)
the first date that the Company receives gross proceeds of at least $7,500,000
from a public offering (the "Public Offering") of Common Stock and (ii) November
2, 1995. If the indebtedness matures as a result of a Public Offering, repayment
of principal of the indebtedness may be made, at the option of the Company, by
delivery of shares of Common Stock valued at the public offering price per share
in the Public Offering. The Company has determined not to exercise such option
and will repay such indebtedness out of the proceeds of the Offering, but the
holders of such indebtedness have agreed to invest in the Offering an amount
equal to the principal of the indebtedness being repaid to purchase the
Principal Stockholder Shares. On July 17, 1995, two of such principal
stockholders loaned the Company an aggregate of an additional $650,000 on the
same terms as the terms of the earlier loans except that the Company does not
have the option to repay the principal of such additional indebtedness by
delivery of shares of Common Stock. Such additional indebtedness will be repaid
out of the proceeds of the Offering. See "Use of Proceeds."
    
 
     In April 1995, Amarillo Cell Culture Company, Incorporated and its licensee
agreed to purchase an aggregate of $750,000 of the Company's Common Stock at
$2.00 per share, all of which cash was received during the second quarter of
1995. See "Business -- Products Under Development -- ALFERON LDO."
 
   
     In the first quarter of 1995, the Company concluded an agreement with
Fujimoto, a pharmaceutical company located in Osaka, Japan, for the
commercialization of the Company's ALFERON N Injection and ALFERON N Gel in
Japan. In connection with the agreement, Fujimoto purchased $1,500,000 of the
Company's Common Stock at $1.45 per share (the then market price), all of which
cash was received during the first quarter of 1995, and is committed to purchase
an additional $500,000 of Common Stock in February 1996 at the then market
price. See "Business -- ALFERON N Injection -- Marketing and Distribution --
Other Marketing and Distribution Arrangements."
    
 
     In connection with the amendments to agreements with Purdue as described
below, during January 1994, Purdue ordered 45,000 vials of ALFERON N Injection
at an agreed upon price. With respect to this order, approximately
three-quarters of the purchase price of the vials was payable upon shipment by
the Company to Purdue and the balance was payable upon sale by Purdue. A portion
of the shipments to fill this order was
 
                                       21
<PAGE>   24
 
   
made on a consignment basis, i.e. the purchase was subject to a right of return
until notification by Purdue that such vials have been resold. In June and
August 1994, the Company began to fill this order by making shipments of 10,000
and 10,735 vials, respectively, of ALFERON N Injection to Purdue on a
consignment basis. In addition, shipments of 5,718 and 9,040 vials of ALFERON N
Injection were made to Purdue in September 1994 and April 1995, respectively, on
a non-consignment basis. The 9,507 vial balance of this order is expected to be
shipped prior to the end of 1995.
    
 
     Purdue has informed the Company that from June 1994 through December 31,
1994, it had sold or distributed as free samples approximately 15,800 vials of
the 20,735 vials purchased on a consignment basis, and that as of March 1995,
Purdue had sold or distributed as free samples the balance of such consignment
inventory. Purdue has also informed the Company that during the three months
ended March 31, 1995 and the year ended December 31, 1994, it sold approximately
6,800 vials and 25,000 vials, respectively, and distributed as free samples
approximately 200 vials and 2,000 vials, respectively, of ALFERON N Injection
from its inventory.
 
     In January 1994, the Company amended its marketing and distribution
agreements with Purdue and related parties. See "Business -- ALFERON N
Injection -- Marketing and Distribution -- Agreements with Purdue." Pursuant to
such amended agreements, the Company assumed sole responsibility to conduct and
fund clinical trials required to obtain FDA approval for additional indications
for ALFERON N Injection. Prior to these amendments, Purdue was responsible for
the payment of the costs of such clinical trials. The Company anticipates that
the expansion of its research and development efforts and clinical trial
activities and its assuming responsibility for the conduct and funding thereof
will increase operating expenses. The Company intends to seek to enter into
joint venture or other arrangements with strategic partners who agree to bear
all or part of such expenses.
 
   
     In connection with the amendments to the agreements with Purdue, the
Company agreed to purchase an aggregate of 994,994 shares of its Common Stock
for $3,979,976 ($4.00 per share) from Purdue and two related entities over a
period of 19 months. The Company purchased 62,500 of such shares of Common Stock
for $250,000 in January 1994 and was obligated to purchase an additional 250,000
shares of Common Stock for $1,000,000 in 1994. In 1994, the Company and Purdue
agreed to offset $700,000 owed to the Company by Purdue, for the purchase of
ALFERON N Injection during 1994, against the Company's obligation to purchase
$1,000,000 of the Company's Common Stock from Purdue in 1994. As of December 31,
1994, $300,000 of this obligation to Purdue had not been paid and was reflected
as a current liability on the balance sheet. In addition, as of March 31, 1995,
the Company had an additional $67,783 of offsets based upon additional sales of
ALFERON N Injection by Purdue. In April 1995, the Company was required to
purchase 62,500 shares of Common Stock for $250,000 and on August 31, 1995 (or
such earlier date on which the Offering shall terminate prior to the sale of the
minimum number of shares of Common Stock) is obligated to purchase 619,994
shares of Common Stock for $2,479,976. As of July 31, 1995, the Company had
generated sufficient additional offsets based upon additional sales of ALFERON N
Injection to and by Purdue to repay the $232,217 owed to Purdue as of March 31,
1995 and to pay $200,843 of the $250,000 owed to Purdue for the April 1995 stock
repurchase. In July 1995, the Company entered into a further amendment to the
agreements with Purdue, which becomes effective upon the sale of the minimum
number of shares of Common Stock in the Offering, pursuant to which the balance
owed to Purdue for the April 1995 stock repurchase will be forgiven and the
Company will obtain an option, exercisable until December 31, 1996, to reacquire
the remaining marketing and distribution rights from Purdue. The exercise price
of the option is $5,029,133, subject to reduction as set forth below, plus
350,000 shares of Common Stock if exercised on or before December 31, 1995 or
750,000 shares of Common Stock if exercised after December 31, 1995. The option
may not be exercised unless the Company simultaneously purchases any of the
619,994 shares of Common Stock described above then held by Purdue for $4.00 per
share. The cash exercise price of the option will be reduced by the aggregate of
(i) the amount paid by the Company to Purdue to repurchase any of such 619,994
shares then held by Purdue, (ii) if Purdue sells any or all of such 619,994
shares, which may only be done with the consent of the Company, the amount
received by Purdue from such sale, and (iii) the amount by which the transfer
price for vials sold by the Company to Purdue exceeds $25 per vial. If the
option is not exercised, the Company will no longer have the obligation to
repurchase the 619,994 shares. In addition, the parties agreed that the transfer
price for each vial will be payable $25 in cash and the balance as an offset to
    
 
                                       22
<PAGE>   25
 
the cash exercise price of the option. If the option is not exercised, such
offsets will have no value. See "Business -- ALFERON N Injection -- Marketing
and Distribution -- Agreements with Purdue." In addition, as of March 31, 1995,
the Company was obligated to pay an aggregate of $286,000 to U.S. Capital
Corporation, which was past due. Such amount was paid in April 1995.
 
   
     Management believes that the cash currently available and the proceeds from
the Offering will be sufficient to enable the Company to continue operations for
approximately seven months from the date of this Prospectus if the minimum
number of shares of Common Stock is sold in the Offering and 16 months if the
maximum number is sold, although no assurance can be given in this regard. To
fund the Company's operations beyond such periods and, if it decides to do so,
to exercise the option to repurchase certain marketing rights from Purdue and to
repurchase certain shares of Common Stock from Purdue, the Company will require
additional funding, whether from financial markets or collaborative or other
arrangements with corporate partners or from other sources, which may not be
available when needed, or on terms acceptable to the Company. Insufficient funds
will require the Company further to delay, scale back, or eliminate certain or
all of its research and development programs or license third parties to
commercialize products or technologies that the Company would otherwise seek to
develop itself and may cause the Company to be in default under additional
agreements with third parties.
    
 
RESULTS OF OPERATIONS
 
  Three Months Ended March 31, 1995 versus Three Months Ended March 31, 1994
 
     For the three months ended March 31, 1995, the Company's revenue of
$179,619 included $174,710 from the sale of ALFERON N Injection and the balance
was derived from sales of research products. Revenue of $1,316 for the three
months ended March 31, 1994 was derived from sales of research products.
Notwithstanding the suspension of ALFERON N Injection production during a
portion of the three months ended March 31, 1995 and during all of the three
months ended March 31, 1994, the Company recorded cost of goods sold and ongoing
production facility costs of $568,095 and $462,786, respectively.
 
     Research and development expenses during the three months ended March 31,
1995 of $960,152 decreased by $209,148 from $1,169,300 for the same period in
1994, principally because the Company reduced its level of research and product
development on ALFERON N Injection. The Company received $45,498 and $37,500
during the three months ended March 31, 1995 and 1994, respectively, as rental
income from NPDC for the use of a portion of the Company's facilities, which
offset research and development expenses.
 
     General and administrative expenses for the three months ended March 31,
1995 were $446,392 as compared to $739,943 for the same period in 1994. The
decrease of $293,551 was principally due to decreases in payroll and other
expenses. NPDC provides certain administrative services for which the Company
paid NPDC $30,000 for each of the three month periods ended March 31, 1995 and
1994. In addition, NPDC provides to the Company, at its estimated cost, certain
personnel and services which the Company uses in its operations. For the three
months ended March 31, 1995 and 1994, such charges amounted to $274,654 and
$441,664, respectively.
 
     Interest and other income for the three months ended March 31, 1995 was
$6,776 as compared to $90,224 for the same period in 1994. The decrease of
$83,448 was due to less funds available for investment in the current period.
 
     Interest expense for the three months ended March 31, 1995 and 1994 was
$9,909 and $65,305, respectively. The decrease of $55,396 was due to reduced
long-term debt.
 
     As a result of the foregoing, the Company incurred net losses of $1,798,153
and $2,345,794 for the three months ended March 31, 1995 and 1994, respectively.
 
  Year Ended December 31, 1994 versus Year Ended December 31, 1993
 
     For the year ended December 31, 1994 (the "1994 Period"), the Company's
revenues of $1,165,931 included $979,425 from the sale of ALFERON N Injection
and the balance from sales of research products, contract research and other
revenues. The revenues of $51,323 for the year ended December 31, 1993 (the
"1993 Period') were derived from sales of research products. Cost of goods sold
for the 1994 Period was the
 
                                       23
<PAGE>   26
 
same as the sales of ALFERON N Injection since the inventory which was sold had
been written down to its net realizable value. Notwithstanding the suspension of
ALFERON N Injection production during a portion of both the 1994 Period and the
1993 Period, the Company recorded ongoing production facility costs of
$1,798,684 and $1,880,563, respectively. For the portion of the 1994 Period
during which the facility was operating, these costs primarily represented
current production costs in excess of the estimated net realizable value of
inventory produced which resulted from limited production volumes.
 
     Research and development expenses during the 1994 Period of $5,195,699
increased by $1,044,541 from $4,151,158 for the 1993 Period, principally
because, effective January 1994, the Company took over the responsibility for
conducting and funding the hepatitis C clinical studies from Purdue and
increased its level of research and product development of ALFERON N Injection.
The Company received $150,000 and $138,996 during the 1994 Period and 1993
Period, respectively, as rental income from NPDC for the use of a portion of the
Company's facilities, which offset research and development expenses.
 
     General and administrative expenses for the 1994 Period were $4,974,224 as
compared to $2,366,897 for the 1993 Period. The increase of $2,607,327 was
principally due to the amortization and subsequent write-off of prepaid
royalties totalling $2,100,000, increases in payroll, and certain costs related
to a proposed public stock offering which was not consummated. NPDC provides
certain administrative services for which the Company paid NPDC $120,000 for
each of the 1994 Period and the 1993 Period. In addition, NPDC provides to the
Company, at its estimated cost, certain personnel and services which the Company
uses in its operations. For the 1994 Period and the 1993 Period, such charges
amounted to $1,194,380 and $895,700, respectively.
 
     Interest and other income for the 1994 Period was $157,929 as compared to
$255,344 for the 1993 Period. The decrease of $97,415 was due to less funds
available for investment in the current year.
 
     For the 1994 Period, the Company realized a net loss of $300,430 from sales
of marketable securities which resulted from declines in the fair value of the
Company's investments in obligations of agencies of the United States
Government. During the 1993 Period, the Company realized a net gain of $3,297
from sales of such investments.
 
     Interest expense for the 1994 Period and 1993 Period was $152,935 and
$371,208, respectively. The decrease of $218,273 was due to reduced long-term
debt.
 
     As a result of the foregoing, the Company incurred net losses of
$12,077,537 and $8,459,862 for the 1994 Period and the 1993 Period,
respectively.
 
  Year Ended December 31, 1993 versus Year Ended December 31, 1992
 
     For the 1993 Period, the Company's revenue of $51,323 was principally
derived from the sale of research products. Revenue of $3,306,397 for the year
ended December 31, 1992 (the "1992 Period") included $3,267,351 from sales of
ALFERON N Injection and the balance was derived from sales of research products.
ALFERON N Injection production was suspended during a portion of the 1993
Period; nevertheless, the Company recorded an idle production facility expense
of $1,880,563, which included a $486,000 write-down at December 31, 1993 of
finished goods inventories to their estimated net realizable value. Cost of
goods sold for the 1992 Period was $3,162,670 resulting in a positive gross
margin of $104,681 on sales of ALFERON N Injection.
 
     Research and development expenses during the 1993 Period of $4,151,158
increased by $167,963 from $3,983,195 during the 1992 Period, principally
because the Company increased its level of research and product development. A
portion of the increase in research and development was also due to increased
activity in support of obtaining regulatory approvals for ALFERON N Injection.
The Company received $138,996 and $141,996 during the 1993 Period and 1992
Period, respectively, as rental income from NPDC for the use of a portion of the
Company's facilities.
 
     General and administrative expenses for the 1993 Period were $2,366,897 as
compared to $2,113,493 for the 1992 Period. The increase of $253,404 was
principally due to increases in expenditures related to exploring
 
                                       24
<PAGE>   27
 
foreign marketing interest in ALFERON N Injection and increases in insurance and
payroll costs. NPDC provides certain administrative services for which the
Company paid NPDC $120,000 for each of the 1993 and 1992 Periods. In addition,
NPDC provides to the Company, at its estimated cost, certain shared personnel
and services which the Company uses in its operations. For the 1993 and 1992
Periods, such charges amounted to $895,700 and $864,615, respectively. See
"Certain Transactions -- Agreements with NPDC."
 
     Interest and other income for the 1993 Period was $255,344 as compared to
$544,322 for the 1992 Period. The decrease of $288,978 was due to a reduction in
cash available for investment as well as lower interest rates.
 
     Interest expense for the 1993 Period and 1992 Period was $371,208 and
$563,294, respectively. The decrease of $192,086 was due to a reduction in the
1993 Period in long-term debt.
 
     As a result of the foregoing, the Company incurred net losses of $8,459,862
and $5,996,855 for the 1993 Period and 1992 Period, respectively.
 
  Recent Tax and Accounting Developments
 
     Effective January 1, 1993, the Company adopted Statement of Financial
Accounting Standards No. 109, "Accounting for Income Taxes,"and effective
January 1, 1994, the Company adopted Statement of Financial Accounting Standards
No. 115, "Accounting for Certain Investments in Debt and Equity Securities."
There was no material effect on the Company's financial condition, results of
operations, or cash flows as a result of the adoption of these principles.
 
     In March 1995, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 121, "Accounting for the Impairment of
Long-Lived Assets and for Long-Lived Assets to be Disposed Of." Statement 121
requires the Company to estimate the future cash flows expected to result from
the use and eventual disposition of its property, plant and equipment, and if
the sum of such cash flows is less than the carrying amount of these assets, to
recognize an impairment loss to the extent, if any, that the carrying amount of
the assets exceeds their fair values. The Company is required to adopt Statement
121 not later than January 1, 1996. The Company believes that, although it has a
current period operating loss and a history of operating losses, expected future
cash flows derived from these assets will be at least equal to their carrying
values, and that no impairment loss will be indicated. The Company bases this
assessment both upon expected future product revenues and upon the fact that it
completed a major manufacturing facility expansion and purchase of manufacturing
equipment in 1991, the cost of which constitutes a major portion of the carrying
value of its property, plant and equipment. The Company believes that this
expanded facility will be suitable for a number of years without significant
repairs.
 
                                       25
<PAGE>   28
 
                                    BUSINESS
 
THE COMPANY
 
   
     The Company is a biopharmaceutical company currently engaged in the
manufacture and sale of ALFERON N Injection, the only product approved by the
FDA that is based upon Natural Alpha Interferon. ALFERON N Injection is approved
for the treatment by injection of certain types of genital warts and is being
developed by the Company for the potential treatment of hepatitis C, hepatitis
B, HIV, multiple sclerosis, cancers, and other indications. The Company believes
that the existing FDA approval of ALFERON N Injection for one indication should
facilitate obtaining approvals for other indications. The Company also is
developing ALFERON N Gel and ALFERON LDO, the Company's topical and oral
formulations of Natural Alpha Interferon.
    
 
     Interferons are a group of proteins produced and secreted by cells to
combat diseases. Currently, various alpha interferon products, approved for 17
different medical uses in over 60 countries, are, as a group, one of the largest
selling of all biopharmaceuticals with estimated 1994 sales in excess of $1.5
billion worldwide. A substantial majority of these sales are for the treatment
of hepatitis C, a liver disease affecting several million people worldwide,
including two to three million people in the United States and three million
people in Japan. As described below, the Company is presently conducting three
multi-center Phase 2 trials using Natural Alpha Interferon for the treatment of
hepatitis C.
 
     Natural Alpha Interferon
 
     A substantial portion of worldwide sales of interferon consists of sales of
alpha interferon produced from genetically engineered cells (recombinant alpha
interferon). Based on laboratory studies and clinical trials involving Natural
Alpha Interferon, the Company believes that Natural Alpha Interferon has certain
potential advantages over recombinant alpha interferon including:
 
        Efficacy.  Natural Alpha Interferon is used at significantly lower doses
        than the competing recombinant alpha interferon product for the
        treatment of genital warts and, in laboratory studies, was shown to be
        10 to 100 times more effective than recombinant alpha interferon in
        blocking replication of HIV. This unusually potent anti-HIV activity may
        be due to specific members of the interferon family of proteins which
        are present in Natural Alpha Interferon but not found in the presently
        marketed recombinant interferons.
 
        Side effects.  The principal side effects of alpha interferon are
        flu-like symptoms, which are dose dependent. The approved treatment with
        ALFERON N Injection utilizes lower doses than the treatment with
        recombinant alpha interferon, which may account, in part, for fewer side
        effects being observed in patients being treated with Natural Alpha
        Interferon. Based on a double-blind study of normal healthy adults, the
        Company believes there is evidence that even when given at the same
        doses as recombinant alpha interferon, the side effects are lower with
        Natural Alpha Interferon. Furthermore, in a Phase 1 clinical trial on 20
        asymptomatic HIV-infected patients, investigators at Walter Reed
        reported that significantly fewer of the typical side effects associated
        with recombinant alpha interferon were observed with Natural Alpha
        Interferon. In addition, interferon-neutralizing antibodies, which may
        limit alpha interferon's therapeutic benefit, have not been observed to
        date in clinical trials with Natural Alpha Interferon, even in HIV and
        hepatitis C patients treated with high doses of such product three times
        a week for up to six months.. There have been reports of these
        antibodies developing in patients being treated with recombinant alpha
        interferons.
 
     Although, as described above, the Company believes that Natural Alpha
Interferon may have certain advantages over recombinant alpha interferon, there
can be no assurance that these advantages will enable the Company to obtain a
significant market share for products made with Natural Alpha Interferon.
Moreover, at the present time, the Company is limited in its ability to make
product marketing claims related to these potential advantages until additional
data are available and, in certain instances, until further FDA approvals are
obtained. Additionally, the Company derives Natural Alpha Interferon from human
white blood cells, the cost and availability of which are subject to
fluctuation, in part because the Company does not presently have
 
                                       26
<PAGE>   29
 
long-term agreements for the supply of such cells. Recombinant alpha interferon
products are not dependent on a source of human white blood cells and,
therefore, can be produced in greater volume and at a lower cost per unit than
the Company's formulations of Natural Alpha Interferon products. See
"Business -- Scientific Background."
 
     Marketing, Distribution, and Production
 
     ALFERON N Injection is approved for sale in the United States for the
intralesional treatment of adults with refractory (resistant to other treatment)
or recurring external genital warts, and is currently marketed and distributed
in the United States exclusively by Purdue. The Company has an option to
repurchase the marketing rights for ALFERON N Injection in the United States and
Canada from Purdue. See "Business -- ALFERON N Injection -- Approved Indication"
and "Business -- ALFERON N Injection -- Marketing and Distribution -- Agreements
with Purdue."
 
   
     In the first quarter of 1995, the Company entered into an agreement with
Fujimoto for the development and marketing of ALFERON N Injection and ALFERON N
Gel in Japan. Japan is currently the world's largest market for interferon
products, with 1994 annual sales approaching $900 million. Under the terms of
the agreement, Fujimoto agreed to purchase $2,000,000 of the Company's Common
Stock and to use its best efforts to develop, and obtain Japanese regulatory
approvals for, ALFERON N Injection and ALFERON N Gel products. The Company
believes that Fujimoto's development effort will entail a substantial expense on
Fujimoto's part. In addition, the Company's Natural Alpha Interferon injectable
product was recently approved for sale in Mexico for the treatment of genital
warts and will be marketed under the trade name ALTEMOL(R) by Andromaco. See
"Business -- ALFERON N Injection -- Marketing and Distribution -- Other
Marketing and Distribution Arrangements."
    
 
     The Company is also exploring development and marketing arrangements that
would involve the potential use of Natural Alpha Interferon for the treatment of
hepatitis B and C, multiple sclerosis, HIV, and cancer. See "Risk
Factors -- Dependence on Certain Distributors; Limited Marketing Program."
 
     The purified drug concentrate utilized in the formulation of ALFERON N
Injection is manufactured in a Company-owned, FDA-approved facility located in
New Brunswick, New Jersey. ALFERON N Injection is formulated and packaged for
the Company by Sanofi at a production facility located in McPherson, Kansas. See
"Business -- ALFERON N Injection -- Manufacturing."
 
     Recently Expanded License
 
     As of March 31, 1995, the Company obtained a non-exclusive license from
Hoffmann and Roche which grants the Company the worldwide rights to make, use,
and sell, without a potential patent infringement claim from Hoffmann or Roche,
any formulation of Natural Alpha Interferon. The 1995 license replaced a 1988
non-exclusive license from Hoffmann which granted the Company the rights to
make, use, and sell in the United States, without a potential patent
infringement claim from Hoffmann, injectable formulations of Natural Alpha
Interferon for the treatment of genital warts or patients with diseases
refractory to recombinant interferon therapy. The 1995 license will enable the
Company, if successful in obtaining necessary regulatory approvals, to expand
the formulations of Natural Alpha Interferon it makes, uses, and sells in the
United States and the rest of the world and to market its products for the
treatment of additional indications. See "Risk Factors -- Potential Patent
Infringement Claims," "Business -- ALFERON N Injection -- Patents and Licenses,"
and "Business -- ALFERON N Injection -- Royalty Obligations."
 
     Clinical Trials
 
     The Company is conducting or planning various clinical trials in an effort
to obtain approval to market Natural Alpha Interferon for additional indications
in the United States and around the world.
 
     ALFERON N Injection.  The Company is presently conducting three
multi-center, randomized, open-label, dose-ranging Phase 2 clinical trials in
patients infected with hepatitis C virus (HCV). The objective of these HCV
clinical studies is to compare the safety and efficacy of different doses of
Natural Alpha Interferon injected subcutaneously in naive (previously
untreated), refractory (unsuccessfully treated with recombinant alpha
interferon), and relapsing (initially responded to recombinant alpha interferon
but later relapsed)
 
                                       27
<PAGE>   30
 
patients. Enrollment of naive patients has been completed at six centers, and
all patients have now finished the six-month treatment and six-month follow-up
periods. Results from this study will be available later this year. Enrollment
of refractory patients has been completed at seven centers, and most patients
have finished the treatment period and entered the six-month follow-up period.
Results from this trial will be available in 1996. Enrollment is actively
continuing in five centers for relapsing patients. The Company believes that the
preliminary results of such trials are promising.
 
     In a recent follow-up analysis of patients in the Walter Reed Phase 1
clinical trial, it was found that an average of 16 months after treatment, CD4
lymphocyte levels (the white blood cells which normally decline in HIV-infected
patients) remained essentially unchanged or were higher than at the onset of the
trial in 11 of 20 patients. In addition, the amount of HIV detectable in the
patients' blood, as measured by a quantitative PCR (Polymerase Chain Reaction)
technique, declined in a dose dependent manner (the greatest declines were
observed in the highest dose group). Although there can be no assurance that the
results of laboratory studies and the Phase 1 clinical trial will be reproduced
in a large-scale, controlled clinical trial, based upon the foregoing, the
Company believes that Natural Alpha Interferon may have potential clinical value
in the treatment of HIV-infected patients. The Company is planning to conduct a
multi-center clinical trial with HIV-infected patients, which is expected to
commence in 1995.
 
     Two additional Phase 2 clinical studies are in progress. One is for the
treatment of Kaposi's sarcoma in patients with AIDS and the other is a
multi-center study in small cell lung cancer patients following successful
treatment by conventional chemotherapy. The goal of the small cell lung cancer
study is to see if Natural Alpha Interferon can alter the high relapse rate in
this disease.
 
     Based upon encouraging anecdotal data, the Company is planning, subject to
obtaining funding or a sponsor, to conduct clinical trials utilizing Natural
Alpha Interferon for the treatment of multiple sclerosis, which affects more
than 250,000 Americans. See "Business -- ALFERON N Injection -- Clinical Trials
for New Indications."
 
     ALFERON N Gel.  ALFERON N Gel is a topical Natural Alpha Interferon
preparation which the Company believes has potential in the treatment of
cervical dysplasia, recurrent genital herpes, other viral diseases, and cancers.
 
   
     The Company has completed a Phase 2 dose ranging study using ALFERON N Gel
at the Columbia Presbyterian Medical Center in New York for the treatment of
mild cervical dysplasia. Based upon Pap Smears, identification tests for the
presence of virus and cervical biopsies, ALFERON N Gel appears to have the
potential for improving the course of cervical dysplasia in the majority of
patients who completed the treatment course. However, since this study utilized
small numbers of patients, there can be no assurance that these results will be
reproduced in a large scale placebo-controlled trial.
    
 
     In light of the above results, a physician-sponsored study in HIV-infected
women with cervical dysplasia is expected to commence in 1995.
 
     ALFERON LDO.  ALFERON LDO is a low dose oral liquid Natural Alpha
Interferon preparation which the Company believes has potential for treating
certain symptoms of patients infected with the HIV virus and treating other
viral diseases.
 
     At New York's Mount Sinai Hospital, the Company conducted two clinical
trials using ALFERON LDO on patients infected with the HIV virus. Based in part
upon information from these trials, The National Institute of Allergy and
Infectious Disease ("NIAID") is planning to conduct in 1995 a randomized,
double-blind, placebo-controlled clinical study with low dose alpha interferons
administered orally (including ALFERON LDO) to determine interferon's effect on
HIV-related symptoms. See "Business -- Products under Development."
 
     Commercial sales in the United States or Mexico of ALFERON N Injection for
any indication other than the treatment of genital warts, commercial sales
outside of the United States and Mexico of ALFERON N Injection for any
indication, and commercial sales anywhere in the world of either ALFERON N Gel
or ALFERON LDO will be contingent upon the completion of necessary studies and
the approval of such
 
                                       28
<PAGE>   31
 
products for such uses by the FDA and foreign regulatory authorities.
Submissions for regulatory approval to sell ALFERON N Injection for the
treatment of genital warts have been filed in various other countries. See
"Business -- Governmental Regulation," "Risk Factors -- Regulatory Approvals,"
and "Risk Factors -- Foreign Regulatory Approvals."
 
     Although the Company received FDA approval to market ALFERON N Injection in
1989, to date, it has had only limited revenue from the sale of ALFERON N
Injection. The Company has experienced significant operating losses since its
inception in 1980. As of March 31, 1995, the Company had an accumulated deficit
of approximately $64.6 million. See "Management's Discussion and Analysis of
Financial Condition and Results of Operations."
 
CLINICAL TRIALS SUMMARY
 
     The table appearing below summarizes the more detailed information
contained elsewhere in this Prospectus concerning clinical trials of ALFERON N
Injection, ALFERON N Gel, and ALFERON LDO being conducted or proposed to be
conducted and is qualified in its entirety by reference to that information.
 
<TABLE>
<CAPTION>
                              POTENTIAL             STATUS OF CLINICAL
      PRODUCT          APPLICATION/INDICATIONS           TRIALS(1)                 SPONSOR
- --------------------  -------------------------  -------------------------  ---------------------
<S>                   <C>                        <C>                        <C>
ALFERON N Injection   HIV-infected patients      Initial Phase 1 completed  Water Reed(2)
                                                 Phase 2/3 in final stages  Company(3)
                                                 of planning
                      Comparison of side         Phase 1 completed          Purdue
                      effects in healthy
                      subjects with recombinant
                      alpha interferon
                      Hepatitis C                Three multi-center Phase   Company(3)(4)
                                                 2 in progress
                      Kaposi's sarcoma           Phase 2 in progress        Company
                      (in AIDS patients)
                      Small cell lung cancer     Phase 2 to commence        Investigator(5)
                                                 shortly
                      Multiple sclerosis         Phase 2 being planned      Company(3)
                      Hepatitis B                Phase 2 proposed           (6)
 
ALFERON N Gel         Cervical dysplasia         Phase 2 completed          Company
                      Cervical dysplasia         Phase 2 in progress        Investigator(5)
                      (in HIV-infected
                      patients)
                      Mucocutaneous herpes in    Phase 2 proposed           (3)
                      immunocompromised
                      patients
                      Recurrent genital herpes   Phase 2 proposed           (6)
 
ALFERON LDO           HIV-infected patients      Initial Phase 2 completed  Company
                      HIV-infected patients      Phase 2 in final stages    NIAID(5)
                                                 of planning
</TABLE>
 
- ---------------
(1) Generally, clinical trials for pharmaceutical products are conducted in
    three phases. In Phase 1, studies are conducted to determine safety and
    tolerance. In Phase 2, studies are conducted to gain preliminary evidence as
    to the efficacy of the product as well as additional safety data. In Phase
    3, studies are conducted to provide sufficient data to establish safety and
    statistical proof of efficacy in a specific dose. Phase 3 is the final stage
    of such clinical studies prior to the submission of an application for
    approval of a new drug or licensure of a biological product or for new uses
    of a previously-approved product. See "Business -- Governmental Regulation."
 
(2) Partially funded by Purdue and the Company.
 
(3) This trial may be funded in whole or in part from the proceeds of the
    Offering. If not funded in whole from the proceeds of the Offering, the
    timing of this trial will be dependent upon the Company's ability to obtain
    additional funding or a sponsor.
 
(4) Previously funded by Purdue; currently funded by the Company.
                                              (footnotes continued on next page)
 
                                       29
<PAGE>   32
 
(5) Notice of Claimed Investigational Exemption for a New Drug has been filed .
 
(6) This trial will not be funded from the proceeds of the Offering. The timing
    of this trial will be dependent upon the Company's ability to obtain
    additional funding or a sponsor.
 
SCIENTIFIC BACKGROUND
 
     Interferons are a group of proteins produced and secreted by cells to
combat diseases. Researchers have identified four major classes of human
interferon: alpha, beta, gamma, and omega. The Company's three ALFERON products
contain a form of alpha interferon. The worldwide market for injectable alpha
interferon-based products has experienced rapid growth and various alpha
interferon injectable products are approved for 17 different medical uses in
more than 60 countries.
 
     Alpha interferons are manufactured commercially in three ways: by genetic
engineering, by cell culture, and from human white blood cells. In the United
States, only two types of alpha interferon are approved for commercial sale:
recombinant (genetically engineered) alpha interferon and Natural Alpha
Interferon, which is manufactured from human white blood cells. Outside of the
United States, sales of alpha interferon produced by cell culture account for a
significant portion of the market.
 
     The Company believes that the potential advantages of Natural Alpha
Interferon over recombinant interferon may be based upon their respective
molecular compositions. An analysis of Natural Alpha Interferon shows that it is
composed of a family of proteins containing many different molecular species of
interferon. In contrast, recombinant alpha interferons each contain only a
single species. Researchers have reported that the various species of interferon
may have differing anti-viral activity depending upon the strain of virus.
Natural Alpha Interferon presents a broad complement of species which the
Company believes may account for its higher efficacy in laboratory studies with
the HIV virus compared with that of single species recombinant alpha interferon.
Natural Alpha Interferon is also glycosylated, or partially covered with sugar
molecules, which does not occur with recombinant alpha interferon. The Company
believes that the absence of glycosylation may be responsible for the production
of interferon-neutralizing antibodies seen in patients treated with recombinant
alpha interferon.
 
     The production of Natural Alpha Interferon is dependent upon a supply of
human white blood cells and other essential materials. The Company currently
obtains white blood cells from FDA-licensed blood donor centers. The Company
currently has no long-term commitments for a supply of such white blood cells.
 
ALFERON N INJECTION
 
     Approved Indication.  On October 10, 1989, the FDA approved ALFERON N
Injection for the intralesional treatment of refractory (resistant to other
treatment) or recurring external genital warts in patients 18 years of age or
older. Substantially all of the Company's revenues, to date, have been generated
from the sale of ALFERON N Injection for such treatment. Genital warts, a
sexually transmitted disease, are caused by certain types of human papilloma
viruses. A published report estimates that approximately eight million new and
recurrent cases of genital warts occur annually in the United States alone.
Genital warts are usually treated using caustic chemicals or through physical
removal methods. These procedures can be quite painful and effective treatment
is often difficult to achieve.
 
     Clinical Trials for New Indications.  In an effort to obtain approval to
market Natural Alpha Interferon for additional indications in the United States
and around the world, the Company is focusing its research program on conducting
and planning various clinical trials for new indications.
 
     Hepatitis C.  Chronic viral hepatitis is a liver infection caused by
various hepatitis viruses. The United States Centers for Disease Control
estimates that approximately 2 to 3 million people in the United States are
presently infected with the hepatitis C virus ("HCV") and an estimated 170,000
persons become newly infected each year, a majority of whom become chronic
carriers and will suffer gradual deterioration of their liver and possibly
cancer of the liver. Several brands of recombinant and cell-cultured interferon
have been approved by various regulatory agencies worldwide for the treatment of
hepatitis C, including a recombinant product in the United States. See
"Business -- ALFERON N Injection -- Competition." However, reports have
indicated that many patients either do not respond to treatment with the
recombinant product or relapse after treatment. The Company presently is
conducting three multi-center, randomized, open-label, dose-
 
                                       30
<PAGE>   33
 
ranging Phase 2 clinical trials utilizing ALFERON N Injection with patients
infected with HCV. The objective of the Company's HCV clinical studies is to
compare the safety and efficacy of different doses of Natural Alpha Interferon
injected subcutaneously in naive (previously untreated), refractory
(unsuccessfully treated with recombinant interferon), and relapsing (initially
responded to recombinant interferon but later relapsed) patients.
 
     Enrollment of naive patients has been completed at six centers, and all
patients have now finished the six-month treatment and six-month follow-up
periods. Presently, the patients' records are being retrieved and prepared for
data entry and analysis. Results from this study are expected to be available
later this year.
 
     Enrollment of refractory patients is now complete at seven centers, and
most patients have finished the treatment period and entered the six-month
follow-up period. Results from this trial are expected to be available in 1996.
 
     Enrollment is actively continuing in five centers for relapsing patients.
The original study protocol only permitted patients who had been previously
treated with a single six-month course of recombinant interferon therapy.
However, since so many patients have a disease relapse after a single course of
recombinant interferon therapy, many of them had been treated with two or more
courses of this therapy, and therefore did not qualify for this study. The
inability to enroll qualified patients has delayed the trial and led the Company
recently to amend its protocol to allow for enrollment of patients who have
received up to three six-month courses of recombinant interferon therapy. This
protocol change should help to accelerate enrollment.
 
     The purpose of these multi-center trials is to help determine the optimal
treatment dose and to study the treatment's utility in different patient
populations. These results will assist in the design of the next phase of these
investigations. The Company believes that the preliminary results of such trials
are promising.
 
     HIV-infected patients.  The Human Immunodeficiency Virus ("HIV") infection
is at epidemic levels in the world. The World Health Organization projects that
this virus will affect 40 to 100 million people by the year 2000. HIV infection
usually signals the start of a progressive disease that compromises the immune
systems, ultimately resulting in Acquired Immune Deficiency Syndrome or AIDS.
HIV-infected patients can be asymptomatic for many years before being afflicted
by opportunistic infections or cancer. The Company believes that slowing the
progression of the HIV infection in healthier patients may help fight against
the development of opportunistic infections and cancer.
 
     An article published in AIDS Research and Human Retroviruses in 1993 by
investigators at Walter Reed in collaboration with the Company's scientists
indicated that the various interferon species display vast differences in their
ability to affect virus replication. Walter Reed researchers found that the
Company's Natural Alpha Interferon was 10 to 100 times more effective than
recombinant interferons in blocking the replication of HIV-1, the AIDS virus, in
infected human cells in vitro.
 
     Moreover, the Company's scientists were able to separate members of the
interferon family in single protein fractions or clusters of proteins using
advanced fractionation techniques. The individual fractions were tested for
their ability to block HIV replication in the laboratory by researchers at
Walter Reed. They found that the unusual anti-HIV activity was attributable to
very specific fractions in the Company's product. The most active fractions are
not present in marketed recombinant interferon.
 
     This information provided additional support for a long-held belief of the
Company that its Natural Alpha Interferon has unique anti-viral properties
distinguishing it from recombinant interferon products. These promising findings
led the Walter Reed researchers to conduct a Phase 1 clinical trial with the
Company's product in asymptomatic HIV-infected patients.
 
     In March 1992, Walter Reed launched a Phase 1 clinical trial with
asymptomatic HIV-infected patients to investigate the safety and tolerance, at
several dose regimens, of Natural Alpha Interferon, self-injected subcutaneously
for periods of up to 24 weeks. The investigators concluded that the treatment
was "surprisingly" well tolerated by patients, at all dose regimens. Preliminary
findings were reported by Walter Reed at the IXth International Conference on
AIDS in Berlin in 1993. The investigators also reported that the expected
interferon side effects, such as flu-like symptoms and a drop in CD4 white blood
cell counts, were rare or absent in the majority of patients treated with the
Company's product.
 
                                       31
<PAGE>   34
 
     Although this Phase 1 clinical trial was designed primarily to provide
safety information on various doses of Natural Alpha Interferon used for
extended periods of time, there were encouraging indications that certain
disease parameters had stabilized or even improved in certain patients by the
end of the experimental treatment.
 
     In a recent follow-up analysis of patients' blood testing data, it was
found that after an average of 16 months after treatment, CD4 lymphocyte levels
(the white blood cells which normally decline in HIV infected patients) remained
essentially unchanged or were higher than at the onset of the trial in 11 of 20
patients. In addition, the amount of HIV detectable in the patients' blood, as
measured by a quantitative PCR (Polymerase Chain Reaction) technique, declined
in a dose dependent manner (the greatest declines were observed in the highest
dose group). Also, none of the patients were found to have developed
neutralizing antibodies to Natural Alpha Interferon, even after being treated
three times weekly for many months. These results were reported at the Third
International Congress on Biological Response Modifiers held in Cancun, Mexico
in January 1995, and an extensive report has been prepared and submitted for
publication.
 
     It is important to note that, because of the small number of study
participants and the absence of a control group, no firm conclusions can be
drawn from these observations. However, the information obtained from this trial
has been helpful in designing the next phase of the clinical program, which will
be initiated in the near future provided adequate funding is secured.
 
     Kaposi's sarcoma (in AIDS patients).  Kaposi's sarcoma is a cancerous
growth characterized by vascular skin tumors and affects approximately 10% of
AIDS patients. It is often the first notable manifestation of AIDS, and as the
tumors become more widely disseminated on the skin, it is associated with
visceral lesions and lymph node involvement. Traditional treatment involves
single agent or combination chemotherapy, but the typical side effects of
chemotherapy can be severe. In the United States, recombinant alpha interferon
has been approved for the treatment of Kaposi's sarcoma in AIDS patients.
However, response has been limited and often followed by relapse. The Company
presently is conducting a Phase 2 clinical trial in Mexico utilizing ALFERON N
Injection for the treatment of Kaposi's sarcoma in patients with AIDS.
 
     Small Cell Lung Cancer.  Small Cell Lung Cancer ("SCLC") represents
approximately 25% of all newly-diagnosed cases of lung cancer and affected
approximately 42,000 people in 1992. Although patients with SCLC initially
respond to high-dose combination chemotherapy regimens, the rate of relapse is
high and such patients have a median survival rate of only 7 to 16 months,
depending upon the extent of disease.
 
     The Company has agreed to supply Natural Alpha Interferon for a
multi-center, physician-initiated, Phase 2 study which is being conducted at
Allegheny General Hospital and at the University of Pittsburgh. Patients who are
in remission following successful treatment with standard chemotherapy will be
entered into this study. They will first receive high dose combination
chemotherapy, followed by peripheral blood stem cell augmentation. One month
after hematologic recovery, patients will then be given Natural Alpha Interferon
injections until evidence of disease progression or intolerable toxicity occurs.
The expected duration of treatment is up to 12 months. The goal of this study is
to investigate Natural Alpha Interferon's potential to extend the disease-free
period and overall survival of these patients.
 
     Multiple Sclerosis.  Multiple sclerosis ("MS") is a chronic, sometimes
progressive, immune-mediated disease of the central nervous system that is
believed to occur in genetically predisposed individuals following exposure to
an environmental factor, such as virus infection. The disease affects an
estimated 250,000 to 350,000 people in the United States, primarily young
adults. Symptoms of MS, including vision problems, muscle weakness, slurred
speech, and poor coordination, are believed to occur when the patient's own
cells attack and ultimately destroy the insulating myelin sheath surrounding the
brain and spinal cord nerve fibers, resulting in improper transmission of
signals throughout the nervous system.
 
     In the United States, a recombinant form of beta interferon has been
approved for the treatment of relapsing-remitting MS. However, reports in the
scientific literature and elsewhere have indicated that the significant adverse
reactions associated with the treatment may limit its usefulness. Once
sufficient funding
 
                                       32
<PAGE>   35
 
has been obtained, the Company is planning to conduct a clinical trial in order
to investigate the potential use of Natural Alpha Interferon for MS.
 
     Chronic Viral Hepatitis B.  Hepatitis B ("HBV") is currently the most
common form of hepatitis virus. Approximately three and a half to four million
people in the United States are infected with this virus, with some 300,000 new
infections occurring annually and over 200 million infected people worldwide.
HBV is transmitted through contact with infected blood, sexual intercourse, and
needle-sharing among intravenous drug users. Infants born to infected mothers
may become infected as they pass through the birth canal. According to the
Centers for Disease Control, approximately 25% of hepatitis B patients develop
irreversible chronic liver conditions, and about 10% of all patients become
lifetime carriers and can transmit the virus to others. The Company is currently
planning clinical trials using ALFERON N Injection in persons infected with
hepatitis B; however, the Company does not anticipate starting the clinical
trials unless funding is secured.
 
     Marketing and Distribution.
 
     Agreements with Purdue.  In 1988, the Company entered into exclusive
marketing and distribution agreements with Mundipharma Pharmaceutical Company
("Mundipharma"), a related entity of Purdue Pharma, with respect to ALFERON N
Injection, which agreements have been amended from time to time (as amended, the
"Purdue Marketing Agreements"). In 1991, Mundipharma assigned the right to
market and distribute ALFERON N Injection in the United States to Purdue Pharma
and retained the right to market and distribute ALFERON N Injection in Canada,
Western Europe, Israel, India, Japan, and Australia. In 1993, the Company
reacquired the right to market and distribute ALFERON N Injection in Japan.
 
   
     In 1994, an amendment to these agreements was entered into (the "1994
Purdue Amendment") pursuant to which the Company reacquired the right to market
ALFERON N Injection in Western Europe and other countries and took over from
Purdue the conduct and funding of clinical trials. Specifically, the 1994 Purdue
Amendment provided, among other things, that (i) the Company reacquired the
right to market ALFERON N Injection in Western Europe, Israel, India, and
Australia (the "Returned Territories"), subject to the payment to Mundipharma of
a royalty equal to 3% of net sales (as defined) in the Returned Territories
until Mundipharma has received royalty payments equal to $3 million ($5 million
under certain circumstances) and 1% of net sales thereafter; (ii) the Company
assumed responsibility for the conduct and funding of clinical trials to develop
new indications for ALFERON N Injection; Purdue was granted the right to obtain
marketing and distribution rights for each additional indication of ALFERON N
Injection at such time as the Company files a product license application or
receives FDA approval for any such additional indication, by reimbursing the
Company for some or all of its clinical costs plus an additional lump-sum
payment; and the Company was given the right to reacquire the rights to market
and distribute ALFERON N Injection in the United States and Canada after each of
the first three additional indications if Purdue does not exercise its right to
obtain marketing and distribution rights for such indication, at a price based
on a percentage of total sales or gross profit during a specified period of all
products subject to the agreement; (iii) the Company agreed to purchase for
$4.00 per share 994,994 shares of Common Stock held by Purdue and certain
related parties over a period of 18 months; (iv) Purdue Pharma and Mundipharma
retained the right to market and distribute ALFERON N Injection in the United
States and Canada, respectively, subject to the Company's option (the "First
Option") to reacquire such rights at a price of $12 million until July 25, 1995
($10 million if the First Option had been exercised before January 1995);
provided that the First Option could not have been exercised unless the Company
simultaneously paid the unpaid balance of the purchase price for the 994,994
shares referred to above, which payment would have reduced the First Option
exercise price; and (v) Purdue ordered 45,000 vials of ALFERON N Injection at an
agreed upon price. Unless certain minimum purchase levels are reached during
certain annual periods, or minimum payments are made to the Company in lieu of
such minimum purchases, the Company can terminate Purdue Pharma and
Mundipharma's exclusive marketing and distribution rights. All marketing and
distribution costs are borne by Purdue Pharma and Mundipharma in their
respective territories.
    
 
     In March 1995, the Company entered into an amendment to the 1994 Purdue
Amendment (the "March 1995 Purdue Amendment") pursuant to which the Company
obtained an option, exercisable until June 30,
 
                                       33
<PAGE>   36
 
   
1995 (the "Second Option"), to reacquire the remaining marketing and
distribution rights from Purdue Pharma and Mundipharma. The exercise price of
the Second Option was 2.5 million shares of Common Stock; provided that the
Option could not have been exercised unless the Company simultaneously paid the
unpaid balance of the purchase price for the 994,994 shares referred to above.
If 18 months from the date of exercise of the Second Option by the Company (the
"Valuation Date"), the 2.5 million shares of Common Stock did not have a value
of at least $9,037,807 (which value was calculated using the average of the
closing bid and asked prices of the Common Stock as quoted by the NASDAQ
National Market System for the ten trading days ending on the day prior to the
Valuation Date), the Company was required to issue a note for the shortfall.
Such note was required to bear interest at the prime rate and became due and
payable 24 months from the Valuation Date. The Company agreed that it would
utilize its best efforts to ensure that the 2.5 million shares of Common Stock
would be registered and freely tradeable 18 months from the date of exercise of
the Second Option. If the Second Option were exercised, the First Option, the
royalty obligations, and Purdue's right to obtain marketing and distribution
rights for new indications contained in the 1994 Purdue Amendment would have
terminated.
    
 
   
     In July 1995, the Company entered into an amendment, which becomes
effective upon the sale of the minimum number of shares of Common Stock in the
Offering, to the 1994 Purdue Amendment and the March 1995 Purdue Amendment (the
"July 1995 Purdue Amendment") pursuant to which the balance owed to Purdue for
the 62,500 shares of Common Stock required to be repurchased in April 1995 will
be forgiven and the Company will obtain an option, exercisable until December
31, 1996 (the "Third Option"), to reacquire the remaining marketing and
distribution rights from Purdue Pharma and Mundipharma. The exercise price of
the Third Option is $5,029,133, subject to reduction as set forth below, plus
350,000 shares of Common Stock if exercised on or before December 31, 1995 or
750,000 shares of Common Stock if exercised after December 31, 1995. The Company
has agreed that it will utilize its best efforts to ensure that such shares will
be registered and freely tradeable upon issuance. The Third Option may not be
exercised unless the Company simultaneously pays the unpaid balance of the
purchase price for any of the 994,994 shares referred to above then held by
Purdue. As of July 31, 1995, Purdue held 619,994 of such shares (excluding the
62,500 shares referred to above) and such unpaid balance was $2,479,976. The
cash exercise price of the Third Option will be reduced by the aggregate of (i)
the amount paid by the Company to Purdue to repurchase any of such 619,994
shares then held by Purdue, (ii) if Purdue sells any or all of such 619,994
shares, which, if the July 1995 Purdue Amendment becomes effective, may only be
done until December 31, 1996 with the consent of the Company, the amount
received by Purdue from such sale, and (iii) the amount by which the transfer
price for vials sold by the Company to Purdue Pharma or Mundipharma exceeds $25
per vial. If the Third Option is exercised, the royalty obligations and Purdue's
right to obtain marketing and distribution rights for new indications contained
in the 1994 Purdue Amendment will terminate. If the July 1995 Purdue Amendment
becomes effective but the Third Option is not exercised, the Company will no
longer have the obligation to repurchase the 619,994 shares. In July 1995, the
Company and Purdue also agreed to extend the date on which the Company is
obligated to repurchase the final 619,994 shares of Common Stock if the July
1995 Purdue Amendment does not become effective from July 25, 1995 to August 31,
1995 (or such earlier date on which the Offering shall terminate prior to the
sale of the minimum number of shares of Common Stock).
    
 
     The Company entered into the 1994 Purdue Amendment, the March 1995 Purdue
Amendment, and the July 1995 Purdue Amendment to provide it with greater
financial flexibility and control over the worldwide marketing and distribution
of ALFERON N Injection. The July 1995 Purdue Amendment provides the Company with
the flexibility to enter into a strategic alliance with a multinational
marketing partner if it elects to exercise the Third Option.
 
     Under the terms of the Purdue Marketing Agreements, the Company receives a
transfer price for the sale of vials of ALFERON N Injection to Purdue Pharma or
Mundipharma. Such transfer price is calculated based on either a manufacturing
cost formula or a fixed price formula (subject to consumer price index
adjustments); provided, however, that if the Company chooses the fixed price
formula, the Company may be entitled to additional payments if the net sales
price received by Purdue Pharma or Mundipharma for ALFERON N Injection exceeds
certain levels. Pursuant to the July 1995 Purdue Amendment, the transfer
 
                                       34
<PAGE>   37
 
price for each vial will be payable $25 in cash and the balance as an offset to
the cash exercise price of the Third Option. If the Third Option is not
exercised, such offsets will have no value. The Company may choose the
applicable formula every six months. Except as described below, Purdue Pharma
and Mundipharma have no recourse against the Company in the event that they are
unable to resell ALFERON N Injection to third parties.
 
   
     In January 1994, pursuant to the 1994 Purdue Amendment, Purdue ordered
45,000 vials of ALFERON N Injection at an agreed upon price. See "Management's
Discussion and Analysis of Financial Condition and Results of
Operations -- Liquidity and Capital Resources." In addition, the Company agreed,
under certain circumstances, to replace up to 15,000 vials of ALFERON N
Injection from Purdue's existing inventory at an agreed upon discounted price.
The Company also granted Purdue an option, exercisable (in whole only) until
July 25, 1995, to purchase an additional 100,000 vials of ALFERON N Injection at
an agreed upon discounted price. The option was not exercised.
    
 
     Purdue Pharma utilizes its affiliate's, The Purdue Frederick Company's,
sales force in the United States. The Purdue Frederick Company's principal
products include BETADINE(R) antiseptics, UNIPHYL(R) controlled release
theophylline, TRILISATE(R) analgesic/anti-inflammatory products, and M.S.
CONTIN(R) tablets for the prolonged relief of pain in cancer patients.
 
   
     Other Marketing and Distribution Arrangements.  In the first quarter of
1995, the Company concluded an agreement with Fujimoto for the commercialization
of ALFERON N Injection and ALFERON N Gel in Japan (the "Fujimoto Agreement").
Fujimoto is affiliated with Fujimoto Pharmaceutical Company, a 60-year old
company with facilities in central Japan. The Fujimoto Agreement grants Fujimoto
exclusive rights to develop, distribute, and sell ALFERON N Injection and
ALFERON N Gel in Japan. Pursuant to the terms of the Fujimoto Agreement,
Fujimoto agreed to fund and conduct all preclinical and clinical studies
required for Japanese regulatory approval. For the injectable product, ALFERON N
Injection, Fujimoto has advised the Company that it will initially focus on the
use of the product for the treatment of patients infected with the hepatitis C
virus. The Company will supply Fujimoto with ALFERON N Injection and will also
manufacture and supply Fujimoto with ALFERON N Gel. The first indication to be
developed for ALFERON N Gel has not yet been determined. Fujimoto will also
purchase certain quantities of ALFERON N Injection and ALFERON N Gel at
agreed-upon prices during the preclinical and clinical phases. In connection
with the Fujimoto Agreement, Fujimoto purchased $1,500,000 of Common Stock for
$1.45 per share (the then current market price), and agreed to purchase an
additional $500,000 of Common Stock on February 6, 1996 at the then current
market price.
    
 
   
     In February 1994, the Company entered into an exclusive distribution
agreement for ALFERON N Injection in Mexico with Andromaco, a privately-held
pharmaceutical company headquartered in Mexico City which specializes in
oncology and immunology products. Under the agreement, Andromaco applied for and
recently obtained approval from the Mexican regulatory authorities to sell
ALFERON N Injection for the treatment of genital warts, which will be marketed
under the trade name ALTEMOL(R). Andromaco has also agreed to sponsor, under a
United States Notice of Claimed Investigational Exemption for a New Drug, a
clinical trial in Mexico of the use of ALFERON N Injection in patients infected
with the hepatitis C virus. The agreement establishes performance milestones for
the maintenance of distribution rights by Andromaco in Mexico. In addition, the
Company has a buy-out option to reacquire the marketing and distribution rights
in Mexico under certain terms and conditions. In March 1995, the agreement was
amended to provide that Andromaco would grant to a designee of the Company an
exclusive sublicense to market and distribute ALFERON N Injection in Mexico if
the Company exercised the Third Option and entered into a distribution agreement
with another pharmaceutical company prior to September 30, 1995.
    
 
     The Company is also exploring development and marketing arrangements that
would involve the potential use of Natural Alpha Interferon for the treatment of
hepatitis B and C, multiple sclerosis, HIV-infected patients, and cancer.
 
     Although the Company has exclusive marketing and distribution agreements
with Purdue Pharma, Mundipharma, Fujimoto, and Andromaco, and has the right to
sell ALFERON N Injection in the Returned Territories, no sales of ALFERON N
Injection can be made in Canada, Japan, or the Returned Territories
 
                                       35
<PAGE>   38
 
until such product is approved for sale in these countries. Submissions for
regulatory approval to sell ALFERON N Injection for treatment of genital warts
have been filed in a number of countries other than the United States and
regulatory approval has been obtained in Mexico. There can be no assurance,
however, that any additional approvals will be granted. See"Business --
Governmental Regulation," "Risk Factors -- Regulatory Approvals,"
and "Risk Factors -- Foreign Regulatory Approvals."
 
     Manufacturing.  The purified drug concentrate utilized in the formulation
of ALFERON N Injection is manufactured in the Company's facility located in New
Brunswick, New Jersey, and ALFERON N Injection is formulated and packaged at a
production facility located in McPherson, Kansas and operated by Sanofi pursuant
to a processing and supply agreement entered into in September 1994. Under the
terms of the agreement with Sanofi, the Company pays Sanofi an agreed price to
formulate and package ALFERON N Injection in accordance with specifications
provided by the Company. These facilities received FDA approval in October 1989.
Subsequently, the Company developed process improvements and completed an
expansion of its manufacturing facility, both of which were approved by the FDA
in June 1991. The process improvements and expanded facility enabled the Company
to reduce the manufacturing costs of ALFERON N Injection and gave the Company
increased production capacity for ALFERON N Injection. See "Risk Factors -- 
Regulatory Approvals" and "Business -- Governmental Regulation."
 
     Competition.  Presently, INTRON(R) A, manufactured by Schering, is the one
other injectable interferon product approved by the FDA for the treatment of
genital warts. INTRON(R) A is made from recombinant alpha interferon. ALFERON N
Injection also competes with surgical, chemical, and other methods of treating
genital warts. The Company cannot assess the impact products developed by the
Company's competitors or advances in other methods of the treatment of genital
warts will have on the commercial viability of its product.
 
     If and when the Company obtains approvals for additional indications of
ALFERON N Injection and its proposed products, it expects to compete primarily
on the basis of product performance and price with a number of pharmaceutical
companies (such as Hoffmann, Roche, Schering, Amgen Inc., and Burroughs Wellcome
Co.), both in the United States and abroad. In addition, the Company's potential
competitors have developed or may develop products (containing either alpha
interferon or other therapeutic compounds) or other treatment modalities which
may compete with the Company's products. For example, Schering's recombinant
interferon product is already approved for the treatment of hepatitis C and
hepatitis B in the United States and other markets, as well as for many other
medical uses, and there is no assurance that if the Company is able to obtain
regulatory approval of ALFERON N Injection for the treatment of those diseases,
it will be able to achieve any significant penetration into those markets. In
addition, since production of the competitive products is not dependent on a
source of human blood cells, such products may be able to be produced in greater
volume and at a lower cost than ALFERON N Injection. Many of the Company's
potential competitors are among the largest pharmaceutical companies in the
world, are well known to the public and the medical community, and have
substantially greater financial resources and product development,
manufacturing, and marketing capabilities than the Company or its marketing
partners.
 
     Patents and Licenses.  On March 5, 1985, the United States Patent and
Trademark Office issued a patent to Hoffmann claiming purified human alpha
(leukocyte) interferon (regardless of how it is produced). In 1988, the Company
obtained a non-exclusive license from Hoffmann which allowed the Company to
make, use, and sell in the United States, without a potential patent
infringement claim from Hoffmann, (i) ALFERON N Injection for the treatment of
genital warts and (ii) injectable formulations of interferon alfa-n3 (which is
the same active ingredient contained in ALFERON N Injection), for the treatment
of patients with diseases which are refractory to recombinant interferon
therapy. On May 6, 1994, the United States Patent and Trademark Office issued an
Office Action in Reexamination on the Hoffmann patent and rejected all of the 14
claims in the Hoffmann patent. Claims in a patent under reexamination are valid
and enforceable until such time as a final disposition on the claims is reached.
On July 11, 1994, Hoffmann filed a response objecting to the Patent Office's
rejection of such claims. The outcome of such reexamination of the Hoffmann
patent cannot be determined at this time. Roche also has been issued patents
covering human alpha interferon in many countries throughout the world. As of
March 31, 1995, the Company obtained a non-exclusive license from Hoffmann and
Roche (the "Hoffmann Agreement") which
 
                                       36
<PAGE>   39
 
grants the Company the worldwide rights to make, use, and sell, without a
potential patent infringement claim from Hoffmann or Roche, any formulation of
Natural Alpha Interferon. The Hoffmann Agreement permits the Company to grant
marketing rights with respect to Natural Alpha Interferon products to third
parties, except that the Company cannot grant marketing rights with respect to
injectable products in any country in which Hoffmann or Roche has patent rights
covered by the Hoffmann Agreement (the "Hoffmann Territory") to any third party
not listed on a schedule of approximately 50 potential marketing partners
without the consent of Hoffmann and Roche, which consent cannot be unreasonably
withheld. The Hoffmann Agreement will enable the Company, if it is successful in
obtaining necessary regulatory approvals, to expand the formulations of Natural
Alpha Interferon it makes, uses, and sells in the United States and the rest of
the world and to market its products for the treatment of additional
indications. See "Risk Factors -- Potential Patent Infringement Claims" and
"Business -- ALFERON N Injection -- Royalty Obligations."
 
     Royalty Obligations.  The Company is a party to certain license agreements
pursuant to which it is obligated to pay royalties based upon the commercial
exploitation of Natural Alpha Interferon products. Under the terms of the
Hoffmann Agreement, the Company is obligated to pay Hoffmann and Roche an
aggregate royalty on net sales (as defined) of Natural Alpha Interferon products
by the Company in an amount equal to (i) 8% of net sales in the Hoffmann
Territory, and 2% of net sales outside the Hoffmann Territory of products
manufactured in the Hoffmann Territory, up to $75,000,000 of net sales in any
calendar year and (ii) 9.5% of net sales in the Hoffmann Territory, and 2% of
net sales outside the Hoffmann Territory of products manufactured in the
Hoffmann Territory, in excess of $75,000,000 of net sales in any calendar year,
provided that the total royalty payable in any calendar year shall not exceed
$8,000,000. The Hoffmann Agreement can be terminated by the Company on 30 days'
notice with respect to the United States patent, any individual foreign patent,
or all patents owned by Hoffmann or Roche. If the Hoffmann Agreement is
terminated with respect to the patents owned by Hoffmann or Roche in a specified
country, such country is no longer included in the Hoffmann Territory. If
Hoffmann's United States patent is found to be invalid, the Company intends to
terminate the Hoffmann Agreement with respect to Hoffmann's United States
patent, which would eliminate the royalty payable to Hoffmann and Roche on net
sales in the United States of products manufactured in the United States. When
the Company received FDA approval for ALFERON N Injection for the treatment of
genital warts in 1989, the Company became obligated to issue shares of Common
Stock to Hoffmann as a prepaid royalty against future net sales by the Company.
Under the terms of the Hoffmann Agreement, certain payments previously made to
Hoffmann (including a portion of the value of the Common Stock previously issued
to Hoffmann) are available as offsets against 50% of the Company's future
royalty obligations to Hoffmann and Roche until the Company obtains an FDA
approval to market ALFERON N Injection for an additional indication. As of March
31, 1995, the Company had approximately $908,952 of credits available to offset
its future royalty obligations to Hoffmann and Roche.
 
     Under the terms of the Purdue Marketing Agreements, unless the Third Option
is exercised and the royalty obligation is terminated as provided in the July
1995 Purdue Amendment, the Company is obligated to pay Mundipharma a royalty
equal to 3% of the net sales of ALFERON N Injection in the Returned Territories
until Mundipharma has received royalty payments equal to $3 million ($5 million
under certain circumstances) and 1% of the Company's net sales in the Returned
Territories thereafter. See "Business -- ALFERON N Injection -- Marketing and
Distribution -- Agreements with Purdue."
 
     In addition, the Company agreed to pay NPDC a royalty of $1 million in
connection with the acquisition of certain intellectual property and technology
rights from NPDC. Such amount is payable if and when the Company generates
income before taxes, limited to 25% of such income before income taxes per year
until the amount is paid in full. See "Risk Factors -- Royalty Obligations" and
"Certain Transactions -- Agreements with NPDC -- Transfer Agreement."
 
                                       37
<PAGE>   40
 
PRODUCTS UNDER DEVELOPMENT
 
  ALFERON N Gel.
 
     ALFERON N Gel is a topical interferon preparation which the Company has
developed and believes has potential in the treatment of cervical dysplasia,
vaginal human papilloma virus infection, recurrent genital herpes, other viral
diseases, and cancers.
 
     Clinical Trials for ALFERON N Gel.  The Company has completed one clinical
trial and plans to conduct various other clinical trials for its ALFERON N Gel
formulation to develop applications and obtain initial approvals for such
products.
 
     Cervical Dysplasia.  Affecting approximately 500,000 to one million women
each year in the United States alone, cervical dysplasia, or abnormal cervical
cells, has been identified as a potential precursor to cervical cancer, which
strikes approximately 13,000 women in the United States each year. Cervical
dysplasia is caused by certain strains of the human papilloma virus (HPV), the
same family of viruses that causes genital warts. The Company has completed a
Phase 2 dose-ranging study using ALFERON N Gel at the Columbia Presbyterian
Medical Center in New York for the treatment of mild cervical dysplasia. In this
pilot study, patients were treated with either a high or low dose of ALFERON N
Gel, both of which were well-tolerated. From both the high and low dose groups,
cytological analyses of Pap smears, identification tests for the presence of
HPV, and cervical biopsies indicated that ALFERON N Gel potentially improved the
course of cervical dysplasia in the majority of patients who completed the
treatment course. Based upon these initial results, a physician-sponsored study
in HIV-infected women with cervical dysplasia is expected to commence shortly,
as described below.
 
     Cervical Dysplasia (in HIV-infected patients).  Cervical dysplasia is
particularly difficult to treat in HIV-infected women. These women have a high
recurrence rate of cervical dysplasia after their initially successful surgical
treatment. As a result of the preliminary results in the initial cervical
dysplasia study described above, the investigator at Columbia-Presbyterian
Medical Center is conducting this physician-sponsored study in which ALFERON N
Gel is being used as an adjuvant to surgical treatment in HIV-infected women
with mild and more severe forms of cervical dysplasia.
 
     Other widespread dermatological lesions potentially treatable with ALFERON
N Gel therapy.  Nearly 30 million people in the U.S. are infected with the
herpes simplex type II virus, which is the infectious virus that causes genital
herpes. Up to a half-million new cases are reported each year, according to the
U.S. Department of Health and Human Services. To date, there is no cure for
genital herpes. Preliminary findings with a previous formulation of recombinant
interferon in the Company's proprietary gel showed significant shortening of the
contagious period and relief of symptoms. ALFERON N Gel may also be of benefit
to immunocompromised patients with mucocutaneous herpes. Patients with this form
of herpes suffer from persistent skin lesions which have become resistant to
existing therapies. While these diseases represent important potential targets
for ALFERON N Gel treatment, additional studies in these areas are dependent
upon future funding.
 
     Competition.  The Company believes that only one product presently sold in
the United States is indicated for the treatment of recurrent genital herpes.
This product, ZOVIRAX(R), produced by Burroughs Wellcome Co., contains a drug
called acyclovir which is administered orally in either solution or capsule form
for the management of recurrent episodes of genital herpes. Two other ZOVIRAX(R)
formulations, one of which is an ointment and the other of which is an
intravenous product, also are sold by Burroughs Wellcome Co. in the United
States for this use.
 
  ALFERON LDO.
 
     ALFERON LDO is a low dose oral liquid alpha interferon preparation. In
October 1989, the Company entered into an agreement (as amended, the "ACC
Agreement") with Amarillo Cell Culture Company, Incorporated ("ACC"), a
privately-held company located in Amarillo, Texas, engaged in the research and
development of animal health products. Under the terms of the ACC Agreement, the
Company has a non-exclusive license under all of ACC's issued patents, patent
applications, and "know-how" relating to the treatment of humans by the oral
administration of Natural Alpha Interferon in low doses. The Company will
 
                                       38
<PAGE>   41
 
   
be obligated to pay ACC royalties of 10% on the sales of Natural Alpha
Interferon products using ACC's patented technology as determined under the ACC
Agreement. In addition, ACC has the right to purchase the Company's Natural
Alpha Interferon for use in the animal health market and is obligated to pay
royalties to the Company based upon sales using the Company's Natural Alpha
Interferon. In April 1995, in connection with certain amendments to the ACC
Agreement, ACC agreed to purchase 312,500 shares of Common Stock at $2.00 per
share and Pharma Pacific Management Pty. Ltd. ("PPM"), a company which has also
obtained a license from ACC, agreed to purchase 62,500 shares of Common Stock at
$2.00 per share, all of which shares were purchased during the second quarter of
1995.
    
 
     Clinical Trials for ALFERON LDO.  The Company has conducted and plans to
conduct various clinical trials for its ALFERON LDO formulation to develop
applications and obtain initial approvals for such products.
 
     HIV-infected patients.  The Company has completed two studies at Mount
Sinai Medical Center in New York involving ALFERON LDO. One was a
placebo-controlled study in AIDS-related complex ("ARC") patients, and the other
was a dose ranging study in AIDS or ARC patients. The results from the
placebo-controlled study did not demonstrate a significant improvement or
alteration in the expected progression of the disease, although patients
receiving ALFERON LDO reported greater energy and appetite than those given the
placebo. Preliminary results from the dose ranging study indicate that one of
the doses may promote weight gain and increased energy.
 
     At the insistence of AIDS groups and community-based physicians who had
been using low-dose formulations of interferon in their practice, the NIAID
agreed to launch a trial of low-dose oral interferon in the United States. An
advisory committee comprised of representatives from interferon manufacturers,
AIDS support groups, FDA, and National Institutes of Health was organized to
design a nationwide, controlled study. This study will investigate the effect of
a number of oral dosage forms of alpha interferon on several quality-of-life
parameters of importance to patients infected with the AIDS virus.
 
     The Company has been active in helping plan this trial, and has agreed to
make clinical quantities of ALFERON LDO available for use in the study. In a
February 23, 1995 press release, the NIAID AIDS Research Advisory Committee
reaffirmed the need to conduct this study and stated that the NIAID will now
begin implementation of this trial. Based upon this press release, the Company
believes that this trial will begin later this year if the NIAID completes all
the necessary steps to initiate this trial.
 
     Competition.  Under the terms of the ACC Agreement, (i) the Company has the
exclusive right to sell ALFERON LDO, containing Natural Alpha Interferon, in the
United States and all foreign countries other than Japan, (ii) ACC and PPM each
has the right to sell any interferon other than Natural Alpha Interferon in the
United States and all foreign countries other than Japan, and (iii) Hayashibara
Biochemical Laboratory has the right to sell its low dose alpha interferon in
Japan. Therefore, with respect to low dose oral interferon products, the Company
will potentially compete with ACC and PPM in the United States and in the rest
of the world except Japan.
 
  ALFERON N Gel and ALFERON LDO.
 
     Sales and Marketing Staff.  The Company does not have a marketing or sales
staff nor does it have a marketing agreement with respect to ALFERON N Gel
(other than the Fujimoto Agreement) or ALFERON LDO and, if FDA marketing
approval of ALFERON N Gel OR ALFERON LDO is obtained, no assurance can be given
that the Company will be able to enter into a marketing agreement for such
products on terms satisfactory to the Company. In February 1995, the Company
entered into the Fujimoto Agreement which, among other things, grants Fujimoto
the exclusive right to develop, distribute, and sell ALFERON N Gel in Japan. See
"Business -- ALFERON N Injection -- Other Marketing and Distribution
Agreements."
 
     Patents and Licenses.  The United States Patent and Trademark Office issued
two patents to the Company which disclose and claim topical interferon
preparations. The patents encompass interferon preparations for the topical
delivery of one or more interferons to the site of a disease which responds
therapeutically to interferon, and a system for delivering interferon topically
which prevents oxidation of the
 
                                       39
<PAGE>   42
 
protein. The inventions specifically encompass the topical treatment for
treating viral diseases, such as herpes genitalis, with alpha interferon. The
Company has various other issued patents and patent applications pending in the
field of biotechnology, purification processes, and therapeutics. See
"Business -- ALFERON N Injection -- Patents and Licenses."
 
   
     Royalty Obligations.  The Company is a party to certain license agreements,
including the Hoffmann Agreement, pursuant to which it is obligated to pay
royalties based upon commercial exploitation of ALFERON N Gel and ALFERON LDO.
Under the terms of such license agreements, the Company would pay royalties of
up to 13.5% and 19.5% of net sales of ALFERON N Gel and ALFERON LDO,
respectively. See "Risk Factors -- Royalty Obligations."
    
 
GOVERNMENTAL REGULATION
 
     Regulations imposed by U.S. federal, state, and local authorities, as well
as their counterparts in other countries, are a significant factor in the
conduct of the research, development, manufacturing, and marketing activities
for present and proposed products developed by the Company.
 
     The Company's or its licensees' potential products will require regulatory
approval by governmental agencies prior to commercialization. In particular,
human medical products are subject to rigorous pre-clinical and clinical testing
and other approval procedures by the FDA in the United States and similar health
authorities in foreign countries. Various federal and, in some cases, state
statutes and regulations also govern or influence the manufacturing, safety,
labeling, storage, recordkeeping, and marketing of such products, including the
use, manufacture, storage, handling, and disposal of hazardous materials and
certain waste products. The process of obtaining these approvals and the
subsequent compliance with applicable federal and foreign statutes and
regulations involves a time-consuming process and requires the expenditure of
substantial resources.
 
     The effect of government regulation may be to delay for a considerable
period of time or prevent the marketing of any product that the Company may
develop and/or impose costly procedures on the Company's activities, the result
of which may be to furnish an advantage to the Company's competitors. Any delay
in obtaining or failure to obtain such approvals would adversely affect the
marketing of the Company's products and the ability to earn product revenue.
 
     Before testing of any agents with potential therapeutic value in healthy
human test subjects or patients may begin, stringent government requirements for
pre-clinical data must be satisfied. These data, obtained from studies in
several animal species, as well as from laboratory studies, are submitted in a
Notice of Claimed Investigational Exemption for a New Drug ("IND") or its
equivalent in countries outside the U.S. where clinical studies are to be
conducted. If the necessary authorizations are received, the Company then
conducts clinical tests of its products on human beings at various unaffiliated
medical centers and institutions. Initial trials (Phase 1) are conducted on a
small number of volunteers to determine whether the drug is safe for human
beings. If the initial trials demonstrate the safety of the product, trials
(Phase 2) are then conducted on patients affected with the disease or condition
under investigation to establish the proper dose and dosing interval. The
findings of these trials are then used to design and implement large-scale
controlled trials (Phase 3) to provide statistical proof of effectiveness and
adequate evidence of safety to meet FDA and/or foreign approval requirements.
 
     The FDA closely monitors the progress of each of the phases of clinical
testing and may, at its discretion, re-evaluate, alter, suspend, or terminate
the testing based on the data which have been accumulated to that point and its
assessment of the risk/benefit ratio to the patient. Estimates of the total time
required for completing clinical testing vary between four and ten years. Upon
successful completion of clinical testing of a new drug, a company typically
submits a New Drug Application ("NDA"), or for biological products such as
Natural Alpha Interferon, a Product and Establishment License Applications
("PLA/ELA") to the FDA summarizing the results and observations of the drugs
during the clinical trials.
 
     To the extent a portion of the manufacturing process for a product is
handled by an entity other than the Company, the Company must similarly receive
FDA approval for the other entity's participation in the manufacturing process.
The Company has entered into an agreement with Sanofi, pursuant to which Sanofi
 
                                       40
<PAGE>   43
 
formulates and packages ALFERON N Injection. The Company presently has a
biologic establishment license for the facilities in which it produces ALFERON N
Injection, which includes the facilities in which Sanofi formulates and packages
ALFERON N Injection. In addition, FDA approval would have to be obtained if the
Company should choose to use an outside formulator and/or packager for ALFERON N
Gel or ALFERON LDO.
 
     Once the manufacture and sale of a product is approved, various FDA
regulations govern the production processes and marketing activities of such
product. A post-marketing testing, surveillance, and reporting program may be
required to continuously monitor the product's usage and effects. Product
approvals may be withdrawn, or other actions may be ordered, if compliance with
regulatory standards is not maintained.
 
     Each individual lot of Natural Alpha Interferon produced must be tested for
compliance with specifications and released for sale by the FDA prior to
distribution in the marketplace. Even after initial FDA marketing approval for a
product has been granted, further studies may be required to provide additional
data on safety or efficacy; to obtain approval for marketing a product as a
treatment for specific diseases other than those for which the product was
originally approved; to change the dosage levels of a product; to support new
safety or efficacy claims for the product; or to support changes in
manufacturing methods, facilities, sources of raw materials, or packaging.
 
     In many markets, effective commercialization also requires inclusion of the
product in national, state, provincial, or institutional formularies or cost
reimbursement systems. The impact of new or changed laws or regulations cannot
be predicted with any accuracy. The Company uses its own staff of regulatory
affairs professionals and outside consultants to enable it to monitor
compliance, not only with FDA laws and regulations, but also with state and
foreign government laws and regulations. See "Risk Factors -- Regulatory
Approvals."
 
     Promotional and educational communications by the Company and its
distributors also are regulated by the FDA and are governed by statutory and
regulatory restrictions and FDA policies regarding the type and extent of data
necessary to support claims that may be made. The Company currently does not
have data adequate to satisfy FDA requirements with respect to potential
comparative claims between Natural Alpha Interferon and competing recombinant
interferon products.
 
     For marketing outside the United States, the Company will also be subject
to foreign regulatory requirements governing human clinical trials,
manufacturing, and marketing approval for drugs and other medical products. The
requirements governing the conduct of clinical trials, product licensing,
pricing, and reimbursement vary widely from country to country. See "Risk
Factors -- Foreign Regulatory Approvals" and "Risk Factors -- Uncertainty of
Pharmaceutical Pricing and Related Matters; Need for Reimbursement."
 
RESEARCH STAFF AND EMPLOYEES
 
   
     As of July 31, 1995, the Company had approximately 54 full-time employees,
of whom approximately 10 hold Ph.D. degrees and 27 hold other degrees in
scientific or technical fields. Of such employees, approximately 18 were engaged
in research and product development, 19 were engaged in manufacturing and
quality control, and the remainder were general and administrative personnel.
Certain direct and indirect management services are provided to the Company by
employees of NPDC and its other subsidiaries pursuant to a Management Agreement
(the "Management Agreement") at a cost to the Company of $120,000 per annum. In
addition, the Management Agreement provides that certain other services which
are provided by approximately 15 NPDC employees, such as legal, maintenance,
shipping and receiving, purchasing, secretarial work, information retrieval, and
regulatory compliance, will be paid for by the Company on an "as used" basis at
NPDC's approximate cost. See "Certain Transactions -- Agreements with
NPDC -- Management Agreement."
    
 
PROPERTIES
 
     The Company's executive offices and its research and production facilities
are located at 783 Jersey Avenue, New Brunswick, New Jersey 08901, and its
telephone number is (908) 249-3250. The Company also maintains offices at 9 West
57th Street, New York, New York 10019, the cost of which is included in the
Management Agreement.
 
                                       41
<PAGE>   44
 
     The Company owns two free standing buildings comprising approximately
44,000 square feet located in New Brunswick, New Jersey. The Company occupies
approximately 24,000 square feet for staff offices, for the production and
purification of interferon, for quality control and research activities, and for
the storage of raw, in process, and finished materials. The Company completed
the expansion of its manufacturing facility in early 1991 and received FDA
approval to use this facility in June 1991. The Company also shares
approximately 9,000 square feet with NPDC and subleases approximately 11,000
feet to NPDC. See Note 1 of "Notes to Consolidated Financial Statements." The
Company believes that its current facilities are (i) suitable and adequate for
research and development and commercial production of purified interferon, (ii)
well maintained, and (iii) in good condition. Substantially all equipment owned
by the Company has been acquired over the past ten years and is in good working
condition.
 
LEGAL PROCEEDINGS
 
     The Company is not a party to any legal proceedings, the outcome of which
is believed by management to have a reasonable likelihood of having any material
adverse effect upon the Company's business, results of operations, or financial
condition.
 
                                   MANAGEMENT
 
   
     As of July 31, 1995, the directors and officers of the Company and their
ages and positions are as set forth below.
    
 
   
<TABLE>
<CAPTION>
                NAME                  AGE                            POSITION
                ----                  ---                            --------
<S>                                   <C>     <C>
Martin M. Pollak(1)(2)(3)...........   68     Chairman of the Board
Jerome I. Feldman(1)(2)(3)..........   67     Chairman of the Board's Executive Committee, Treasurer
                                              and a Director
Samuel H. Ronel, Ph.D...............   59     President, Chief Executive Officer, and a Director
Stanley G. Schutzbank, Ph.D.........   50     Executive Vice President and a Director
Leon Botstein, Ph.D.................   47     Director
Sheldon L. Glashow, Ph.D............   63     Director
Roald Hoffmann, Ph.D.(4)............   57     Director
Ogden R. Reid(1)(3)(4)..............   70     Director
Donald W. Anderson..................   46     Controller (Principal Accounting and Financial
                                              Officer) and Secretary
Drew Stoudt.........................   48     Vice President, Regulatory Affairs and Quality
Mei-June Liao, Ph.D.................   44     Vice President, Research and Development
Lawrence M. Gordon..................   41     Vice President and General Counsel
</TABLE>
    
 
- ---------------
(1) Member of the Executive Committee.
 
(2) Member of the Compensation Committee.
 
(3) Member of Stock Option Committee.
 
(4) Member of the Audit Committee.
 
     All directors are serving a current term of office which continues until
the next annual meeting of stockholders, and all officers are serving a current
term of office which continues until the next annual meeting of directors.
 
     Martin M. Pollak has been Chairman of the Board since 1981. He is a founder
of NPDC (a holding company) and has been Executive Vice President, Treasurer and
a director of NPDC since 1959. Mr. Pollak is Chief Executive Officer, President
and a director of American Drug Company ("ADC"), a subsidiary of NPDC which
markets American-made generic pharmaceutical products in Russia. He has been
Chairman of the Board and a director of General Physics Corporation ("GPC"), a
subsidiary of NPDC which provides personnel training and technical support
services to the domestic commercial nuclear power industry and to the United
States Department of Energy since 1988; and a director since 1987; Chairman of
the Executive
 
                                       42
<PAGE>   45
 
Committee of GTS Duratek, Inc. ("Duratek"), a company which provides
environmental technology and consulting, and staff augmentation services to
various utility, industrial and commercial clients from 1985 to January 1995 and
a director since 1982; Chairman of the Board and a director of SGLG, Inc.
("SGLG"), a subsidiary of NPDC, which is a holding company with a 35% interest
in GSE Systems, Inc. ("GSE"), a software simulator company, since May 1991; and
a director of GSE since June 1995. Mr. Pollak is Chairman of the Czech and
Slovak United States Economic Council, a member of the Board of Trustees of the
Worcester Foundation for Experimental Biology and a director of Brandon Systems
Corporation, a personnel recruiting company, since 1986.
 
     Jerome I. Feldman has been Chairman of the Board's Executive Committee and
a director of the Company since 1981. He has also been the Treasurer of the
Company since 1984. Mr. Feldman is a founder of, and since 1959 has been
President, Chief Executive Officer and a director of, NPDC. Mr. Feldman is
Chairman of the Board of and a consultant to ADC. He has been Chairman of the
Executive Committee of GPC since 1988 and a director of GPC since 1987; Chairman
of the Board of Duratek from 1985 to January 1995 and a director since 1982 and
Chairman of the Executive Committee and a director of SGLG since May 1991; and a
director of GSE since June 1995. He has been a director of Hamilton Financial
Services, Inc., a financial service company, since 1983. He is a trustee of the
New England Colleges Fund and of Bard College.
 
     Samuel H. Ronel, Ph.D. has been President, Chief Executive Officer, and a
director of the Company since 1981 and was responsible for the interferon
research and development program since its inception in 1979. Dr. Ronel joined
NPDC in 1970 and has served as the Vice President of Research and Development of
NPDC since 1976 and as the President of Hydro Med Sciences, a division of NPDC,
since 1976. Dr. Ronel served as President of the Association of Biotechnology
Companies, an international organization representing United States and foreign
biotechnology firms, from 1986-88 and has served as a member of its Board of
Directors until 1993. Dr. Ronel was elected to the Board of Directors of The
Biotechnology Industry Organization in 1993.
 
     Stanley G. Schutzbank, Ph.D. has been Executive Vice President and a
director of the Company since 1981 and has been associated with the interferon
research and development program since its inception in 1979. He is involved
with all facets of administration and planning of the Company and has
coordinated compliance with FDA regulations governing manufacturing and clinical
testing of interferon, leading to the approval of ALFERON N Injection in 1989.
Dr. Schutzbank joined NPDC in 1972 and has served as the Corporate Director of
Regulatory and Clinical Affairs of NPDC since 1976 and as Executive Vice
President of Hydro Med Sciences since 1982. Dr. Schutzbank is a member of the
Regulatory Affairs Professionals Society and has served as Chairman of the
Regulatory Affairs Certification Board from its inception until 1994. Dr.
Schutzbank received the 1991 Richard E. Greco Regulatory Affairs Professional of
the Year Award for his leadership in developing the United States Regulatory
Affairs Certification Program.
 
     Leon Botstein, Ph.D. has been a director of the Company since 1981 and has
been the President of Bard College, Annandale-on Hudson, New York since 1975.
Dr. Botstein has been a director of Intelogic Trace, Inc., a computer
maintenance and support service company since 1985.
 
     Sheldon L. Glashow, Ph.D. has been a director of the Company since October
1991. He has been a director of GPS since January 1987, a director of GSE since
June 1995, a director of CalCol, Inc., a pharmaceutical company, since 1993, and
was a director of Duratek from 1985 to January 1995. Dr. Glashow is the Higgins
Professor of Physics of Harvard University and was a Distinguished Professor and
Visiting Professor of Physics at Boston University. In 1971, he received the
Nobel Prize in Physics.
 
     Roald Hoffmann, Ph.D. has been a director of the Company since 1991 and a
director of NPDC since 1988. Dr. Hoffmann has been the John A. Newman Professor
of Physical Science at Cornell University since 1974 and is a member of the
National Academy of Sciences and the American Academy of Arts and Sciences. In
1981 he shared the Nobel Prize in Chemistry with Dr. Kenichi Fukui.
 
     Ogden R. Reid has been a director of the Company since 1982, a director of
NPDC since 1979, a director of GPC since January 1988, and Vice Chairman of the
Board of GPS since 1992. He was Vice Chairman and a director of Duratek from
1991 to January 1995. He has also been a director of Royce Laboratories, Inc., a
 
                                       43
<PAGE>   46
 
generic drug company, since 1995. Mr. Reid was Editor and Publisher of the New
York Herald Tribune and of its International Edition, an United States
Ambassador to Israel, a six-term member of the United States Congress and a New
York State Environmental Commissioner.
 
     Donald W. Anderson has been the Controller of the Company since 1981 and
Corporate Secretary of the Company since 1988. He has been an officer of various
subsidiaries of NPDC since 1976.
 
     Drew Stoudt has been Vice President, Regulatory Affairs and Quality of the
Company since March 1991. He was Vice President, Quality Assurance and Quality
Control from February 1990 to March 1991. Mr. Stoudt has served as Director of
Quality Assurance for the Company and other divisions of National Patent from
1985 to 1990.
 
     Mei-June Liao, Ph.D., has been Vice President, Research and Development of
the Company since March 1995. She has served as a Director, Research &
Development since 1987, and held senior positions in the Company's Research &
Development Department since 1983. Dr. Liao received her Ph.D. from Yale
University and completed a three-year post doctoral appointment at the
Massachusetts Institute of Technology under the direction of Nobel Laureate in
Medicine, Professor H. Gobind Khorana. Dr. Liao has authored many scientific
publications and invention disclosures.
 
     Lawrence M. Gordon has been the General Counsel of the Company since 1984,
the General Counsel of NPDC since November 1986, and Vice President and General
Counsel of both companies since June 1991. He was Associate General Counsel of
NPDC from 1983 through November 1986. Mr. Gordon has been a director of GPC
since October 1994.
 
                             PRINCIPAL STOCKHOLDERS
 
   
     The following table sets forth the number of shares of the Common Stock
beneficially owned as of July 31, 1995 by each person who is known by the
Company to own beneficially more than 5% of the Company's outstanding Common
Stock.
    
 
   
<TABLE>
<CAPTION>
                     NAME AND ADDRESS                           NUMBER OF SHARES          PERCENTAGE
                    OF BENEFICIAL OWNER                        BENEFICIALLY OWNED         OF CLASS(1)
                    -------------------                        ------------------         -----------
<S>                                                                <C>                        <C>
National Patent Development Corporation....................         6,975,148(2)(3)           31.1%
Martin M. Pollak...........................................         7,467,648(2)(4)           33.2%
Jerome I. Feldman..........................................         7,481,598(2)(5)           33.3%
David Blech................................................           800,000(6)               3.6%
Nicholas L. Madonia, Trustee...............................         2,297,500(7)(8)           10.2%
Mordechai Jofen, Trustee...................................           157,500(3)(9)            0.7%
Biotechnology Investment Group, L.L.C......................         2,527,500(3)(6)(10)       11.3%
</TABLE>
    
 
- ---------------
   
 (1) The percentage of class calculation assumes for each beneficial owner that
     all of the warrants are exercised in full only by the named beneficial
     owner and that no other options or warrants are deemed to be exercised by
     any other stockholders.
    
 
   
 (2) Includes (i) 4,800,148 shares of Common Stock owned by NPDC, (ii) 1,359,375
     shares of Common Stock owned by Five Star Group, Inc. ("FSGI"), and (iii)
     815,625 shares of Common Stock owned by MXL Industries, Inc. ("MXL"). FSGI
     and MXL each is a wholly-owned subsidiary of NPDC. Based upon the common
     stock and Class B Stock of NPDC outstanding at July 12, 1995, Martin M.
     Pollak and Jerome I. Feldman, officers and directors of NPDC, and directors
     of the Company, controlled in the aggregate approximately 10.2% of the
     voting power of all voting securities of NPDC. This percentage for Mr.
     Pollak and Mr. Feldman would increase to approximately 45.8% if they
     exercised all of the presently outstanding and currently exercisable stock
     options to purchase shares of the common stock and Class B Stock of NPDC
     held by them. Accordingly, Messrs. Pollak and Feldman, through their
     ownership of NPDC common stock, may be deemed to beneficially own the
     shares of Common Stock beneficially owned by NPDC, FSGI, and MXL. However,
     Messrs. Pollak and Feldman disclaim
    
 
                                       44
<PAGE>   47
 
     beneficial ownership of such 6,975,148 shares. All of the shares of Common
     Stock owned by NPDC, FSGI, and MXL have been pledged to a bank as
     collateral to secure indebtedness owed to such bank. The address of NPDC
     and Messrs. Pollak and Feldman is 9 West 57th Street, Suite 4170, New York,
     New York 10019.
 
   
 (3) Does not include the Principal Stockholder Shares. See "Certain
     Transactions -- Other Transactions" and "Risk Factors -- Control by
     Principal Stockholders; Conflicts of Interest."
    
 
 (4) Includes (i) 6,975,148 shares of Common Stock beneficially owned by NPDC,
     FSGI, and MXL, (ii) 1,000 shares of Common Stock held by Mr. Pollak's wife,
     and (iii) 490,000 shares of Common Stock issuable upon exercise of
     currently exercisable stock options held by Mr. Pollak. Mr. Pollak
     disclaims beneficial ownership of the shares of Common Stock owned by NPDC
     and his wife.
 
 (5) Includes (i) 6,975,148 shares of Common Stock beneficially owned by NPDC,
     FSGI, and MXL, (ii) 2,950 shares of Common Stock held by certain members of
     Mr. Feldman's family, and (iii) 490,000 shares of Common Stock issuable
     upon exercise of currently exercisable stock options held by Mr. Feldman.
     Mr. Feldman disclaims beneficial ownership of the shares of Common Stock
     owned by NPDC and his family.
 
   
 (6) Excludes (i) 1,240,000 shares of Common Stock held by Freedom Charitable
     Remainder Trust ("Freedom") of which David Blech is the income beneficiary
     but not the trustee, (ii) 480,000 shares of Common Stock held by Frontier
     Charitable Remainder Trust ("Frontier") of which David Blech is the income
     beneficiary but not the trustee, (iii) 430,000 shares of Common Stock held
     by Sentinel Charitable Remainder Trust ("Sentinel") of which David Blech is
     the income beneficiary but not the trustee, (iv) 147,500 shares of Common
     Stock held by the Blech Family Trust ("Blech Family Trust") of which David
     Blech is the income beneficiary but not the trustee, and (v) 157,500 shares
     of Common Stock held by the Edward A. Blech Charitable Remainder Trust
     ("Edward Blech Trust") of which David Blech is the income beneficiary but
     not the trustee. Mr. Blech disclaims beneficial ownership of the shares of
     Common Stock held by Freedom, Frontier, Sentinel, Blech Family Trust, and
     Edward Blech Trust. Mr. Blech's address is c/o D. Blech & Company,
     Incorporated, 599 Lexington Avenue, New York, New York 10022.
    
 
   
 (7) Based, in part, on a Schedule 13D filed by the beneficial owner with the
     Securities and Exchange Commission.
    
 
   
 (8) Includes 1,240,000 shares of Common Stock held by Freedom, 480,000 shares
     of Common Stock held by Frontier, 430,000 shares of Common Stock held by
     Sentinel, and 147,500 held by Blech Family Trust, of which trusts Mr. Blech
     is the income beneficiary but not the trustee. As sole trustee of each of
     the trusts, Mr. Madonia has the right to vote and dispose of the shares
     held by such trusts. Mr. Blech disclaims beneficial ownership of such
     shares of Common Stock. Mr. Madonia's address is c/o Madonia, Pilles & Co.,
     P.A., 30 Outwater Lane, Garfield, New Jersey 07026.
    
 
   
 (9) Includes 157,500 shares of Common Stock held by Edward Blech Trust. As sole
     trustee of such trust, Mr. Jofen has the right to vote and dispose of the
     shares held by such trust. Mr. Blech disclaims the beneficial ownership of
     such shares of Common Stock. Mr. Jofen's address is 418 Avenue I, Brooklyn,
     New York 11231.
    
 
   
(10) The members of Biotechnology Investment Group, L.L.C. ("BIG"), which is a
     limited liability company, are: Collinson Howe Venture Partners, Inc.
     (formerly known as Schroder Venture Advisers, Inc.) (Jeffrey J. Collinson
     is its president and its sole director and majority owner); Mordechai
     Jofen, 418 Avenue I, Brooklyn, New York 11231, as trustee of the Edward
     Blech Trust; and Wilmington Trust Company, 1100 N. Market Street,
     Wilmington, Delaware 19890, as voting trustee. Such persons may have shared
     voting and dispositive power over these shares. All of the shares of Common
     Stock owned by BIG have been pledged to Citibank, N.A. as collateral to
     secure indebtedness owed to such bank. The address of BIG is 1055
     Washington Blvd. Stamford, CT 06901.
    
 
                                       45
<PAGE>   48
 
                              CERTAIN TRANSACTIONS
 
AGREEMENTS WITH NPDC
 
     Transfer Agreement.  As of January 1, 1981, NPDC entered into an agreement
(the "Transfer Agreement") with the Company pursuant to which NPDC (i) licensed
to the Company in perpetuity all of its right, title and interest in and to
certain intellectual property and technology rights (the "Intangible Assets")
relating to its programs in human leukocyte interferon and recombinant DNA and
hybridoma technology and (ii) transferred to the Company its rights under
certain consulting, supply, and research agreements (the "Agreements"). In
consideration of the license and transfer of the Intangible Assets and the
Agreements, the Transfer Agreement provides that the Company will pay to NPDC a
royalty of $1,000,000. Such amount is payable if and when the Company generates
income before income taxes, and is limited to 25% of such income before taxes
per year until the amount is paid in full. See "Risk Factors -- Royalty
Obligations."
 
   
     Management Agreement.  As of January 1, 1981, NPDC entered into the
Management Agreement with the Company pursuant to which certain legal,
financial, and administrative services have been provided by employees of NPDC.
The fee for such services is $120,000 per annum. In addition, the Management
Agreement provides that certain other services provided by NPDC's employees,
such as maintenance, shipping and receiving, purchasing, secretarial work,
information retrieval, and regulatory compliance, will be paid for by the
Company on an "as used" basis at NPDC's approximate cost. During 1994, NPDC
charged $1,194,380 to the Company for such other services. The Company is also
covered under certain of NPDC's insurance policies and pays its proportionate
share of insurance costs.
    
 
     Lease Agreement.  The Company owns two free standing buildings aggregating
approximately 44,000 square feet located in New Brunswick, New Jersey. The
Company and NPDC have entered into an agreement for the sharing of the office,
warehouse, and laboratory facility. The Company occupies approximately 24,000
square feet, shares approximately 9,000 square feet with NPDC, and subleases
approximately 11,000 square feet of space to NPDC at such location. During 1994,
NPDC paid the Company as rent NPDC's proportionate share of such occupancy costs
(based on both square feet occupied and number of personnel), which amounted to
$150,000.
 
     While the above-described agreements were negotiated with a principal
stockholder of the Company which was then its parent, the Company nevertheless
believes that such agreements are equivalent economically to arms-length
transactions with a third party.
 
AGREEMENTS WITH DAVID BLECH AND RELATED PARTIES
 
   
     On May 28, 1993, David Blech, the Chief Executive Officer, sole
shareholder, and a director of DBC, and the Company entered into a Purchase
Agreement (the "Purchase Agreement"), pursuant to which Mr. Blech or his
designees purchased for $4.00 per unit, an aggregate of 2,500,000 units
("Units"), each Unit consisting of two shares of the Company's Common Stock, one
Class A Warrant (the "Class A Warrants") to purchase one share of Common Stock
at an exercise price of $3.25 per share, and one Class B Warrant (the "Class B
Warrants") to purchase one share of Common Stock at an exercise price of $5.00
per share. The Class A Warrants and the Class B Warrants expire on August 31,
2000. The following acquisitions were made in installments pursuant to the
Purchase Agreement: (i) two charitable remainder trusts, of which Mr. Blech is
the income beneficiary but not the trustee, purchased an aggregate of 1,050,000
Units, (ii) Mr. Blech purchased 1,187,500 Units, (iii) Mark S. Germain, a
Managing Director of DBC, purchased 250,000 Units, and (iv) an unaffiliated
purchaser purchased 12,500 Units. The purchasers have certain demand
registration rights as to the securities acquired by them under the Purchase
Agreement. Under the Purchase Agreement, Mr. Blech had the right (which was
never exercised) to cause the Company to nominate two designees of Mr. Blech
(the "Blech Nominees") to the Board of Directors of the Company as long as Mr.
Blech and the other purchasers under the Purchase Agreement beneficially owned,
in the aggregate, at least 2,000,000 shares of Common Stock. In 1993, the
Company paid DBC a $500,000 fee for its services in connection with the Purchase
Agreement.
    
 
   
     Pursuant to the Purchase Agreement, a 10-year Voting Agreement (the "Voting
Agreement") among David Blech, NPDC, FSGI, and MXL became effective as of May
28, 1993 pursuant to which NPDC, FSGI, and MXL agreed to (a) vote all their
shares of Common Stock for the election of the Blech Designees as
    
 
                                       46
<PAGE>   49
 
   
directors of the Company unless Mr. Blech and the other purchasers under the
Purchase Agreement dispose of more than 1,000,000 shares of Common Stock and (b)
restrict transfer of the Common Stock held by them for one year, subject to
certain exceptions. Pursuant to the Voting Agreement, Mr. Blech and the other
purchasers under the Purchase Agreement agreed to vote for the election of two
nominees of NPDC as directors of the Company unless NPDC, MXL and FSGI disposed
of any shares of Common Stock (other than up to 2,000,000 shares disposed of in
exchange for debt obligations of NPDC, MXL, or FSGI). Concurrently with the
execution of the Purchase Agreement, the Company entered into a consulting
agreement with DBC under which the Company agreed to pay $100,000 per year,
payable monthly, to DBC for advisory services with respect to the Company's
field of interest and business, strategic, and commercial matters related to the
biotechnology industry. The term of the consulting agreement was for one year
commencing on June 1, 1993, and was renewed on the same terms for an additional
one-year period which expired on June 1, 1995. David Blech and the Company were
unaffiliated prior to the transactions described above, which were negotiated on
an arm's-length basis.
    
 
     On May 13, 1994, the Company filed a registration statement with the
Securities and Exchange Commission, which statement was amended on July 1, 1994
and was subsequently amended again on August 10, 1994, covering a proposed
public offering of 2,000,000 shares of the Company's Common Stock to be managed
by DBC as underwriter. On September 22, 1994, DBC could not meet certain minimum
capital requirements and was forced to discontinue its operations. Consequently,
the Company had to cancel the proposed public offering of Common Stock.
 
     On December 6, 1994, the Company entered into a Purchase and Exchange
Agreement with Mr. Blech and certain other parties pursuant to which Sentinel
Charitable Remainder Trust, a trust of which Mr. Blech is the income beneficiary
but not the trustee, purchased 430,000 shares of Common Stock for $1 per share
or an aggregate purchase price of $430,000. The purchase price was negotiated on
an arms-length basis and the shares were sold at a discount to market value as a
result of the Company's need for additional working capital. In addition,
pursuant to such agreement, David Blech and certain other parties agreed to
exchange 2,250,000 Class A Warrants and 2,250,000 Class B Warrants for 900,000
shares of Common Stock. The issuance and exchange of the shares of Common Stock
pursuant to the Purchase and Exchange Agreement were completed in April 1995. In
connection with and in consideration for the Purchase and Exchange Agreement
described above, Mr. Blech and certain other parties and the Company entered
into an agreement (i) terminating and cancelling the Voting Agreement discussed
above, (ii) deleting in its entirety a provision of the Purchase Agreement with
respect to conflicting "piggyback" registration rights, and (iii) deleting in
its entirety the provision of the Purchase Agreement with respect to Board
representation and nomination rights of the Blech Designees.
 
OTHER TRANSACTIONS
 
   
     On May 3, 1995, NPDC, BIG, and Edward Blech Trust committed to loan the
Company $600,000, $220,000, and $100,000, respectively. All of such loans were
made by July 6, 1995. Such loans bear interest at prime plus 2% and mature on
the earlier of (i) the first date that the Company receives gross proceeds of at
least $7,500,000 from a public offering (the "Public Offering") of Common Stock
and (ii) November 2, 1995. If the indebtedness matures as a result of a Public
Offering, repayment of principal of the indebtedness may be made, at the option
of the Company, by delivery of shares of Common Stock valued at the public
offering price per share in the Public Offering. The Company has determined not
to exercise such option and will repay such indebtedness out of the proceeds of
the Offering, but the holders of such indebtedness have agreed to invest in the
Offering an amount equal to the principal of the indebtedness being repaid to
purchase the Principal Stockholder Shares. On July 17, 1995, NPDC and BIG loaned
the Company an additional $500,000 and $150,000, respectively, on the same terms
as the terms of the earlier loans except that the Company does not have the
option to repay the principal of such additional indebtedness by delivery of
shares of Common Stock. Such additional indebtedness will be repaid out of the
proceeds of the Offering. See "Use of Proceeds."
    
 
   
     As of July 25, 1995, Lawrence M. Gordon, the Vice President and General
Counsel of the Company, had a principal balance outstanding on a loan from the
Company due July 9, 1997 of $150,000. Interest on the loan is payable quarterly
at a rate of 6% per annum.
    
 
                                       47
<PAGE>   50
 
                                  UNDERWRITING
 
   
     The Company has entered into an underwriting agreement (the "Underwriting
Agreement") with Sunrise Securities Corp. to serve as the Underwriter in
connection with the Offering. Pursuant to the Underwriting Agreement, the
Company has retained the Underwriter to conduct, as its exclusive agent, an
offering of shares of its Common Stock on a 6,500,000 share minimum, 12,000,000
share maximum "best efforts" basis, for a period terminating 30 days from the
date hereof, unless extended for up to 30 additional days by the Underwriter.
The Company's officers, directors, employees, and principal stockholders may
purchase shares of Common Stock in the Offering. All such purchases (including
the Principal Stockholder Shares) may be used to satisfy the 6,500,000 minimum.
All funds received by the Underwriter will be deposited in an escrow account
with Bank of Montreal Trust Company, as escrow agent (the "Escrow Agent"),
pursuant to an escrow agreement entered into by the Company, the Underwriter and
the Escrow Agent. Payments shall be made by either check or wire transfer. All
checks for subscriptions of the shares of Common Stock should be made payable to
Bank of Montreal Trust Company, as Escrow Agent. If at least 6,500,000 shares
offered hereby are sold within the initial 30 day period (or extended period),
all funds received, less (except in the case of the Principal Stockholder
Shares) the Underwriter's discounts and commissions and expense allowance, will
be delivered to the Company and certificates representing the shares purchased
promptly will be delivered to or for the account of subscribers. In the event
that the minimum number of shares is not sold within the designated period, all
funds will be returned to subscribers without any deduction therefrom or
interest thereon. Until such time as funds have been released from escrow and
the securities delivered to the purchasers thereof, such purchasers will be
deemed subscribers and not security holders.
    
 
   
     The Company and the Underwriter shall have an initial closing once at least
6,500,000 shares (and up to the maximum number of shares) have been sold in
order to disburse the proceeds therefrom. Once such shares are sold, the
Offering shall continue either until the Company and the Underwriter agree to
terminate the Offering or until up to the maximum 12,000,000 shares are sold or
until the Offering period terminates. If any additional shares are sold after
the initial closing, there shall be subsequent closings to disburse the
additional funds received.
    
 
     The initial public offering price for the Common Stock has been determined
by negotiation between the Company and the Underwriter. Among the factors
considered in determining the initial public offering price were the Company's
results of operations, current financial condition, and future prospects, the
state of the markets for its products, the experience of its management, the
economics of its industry in general, the market price and trading history of
the Common Stock, the general condition of the equity securities markets, and
the demand for similar securities of companies considered comparable to the
Company.
 
     The Underwriter has advised the Company that it proposes to offer the
shares to the public at the public offering price set forth on the cover page of
this Prospectus and that it may allow to certain dealers who are members of the
National Association of Securities Dealers, Inc. (the "NASD"), concessions of
not in excess of $     per share, of which not more than $     per share may be
reallowed to other dealers who are members of the NASD. After the initial
closing, the offering price, concession, and reallowance may be changed by the
Underwriter.
 
     The Company has agreed to indemnify the Underwriter against certain
liabilities in connection with the Registration Statement, including liabilities
under the Securities Act.
 
   
     The Company has agreed to pay the Underwriter (i) a non-accountable expense
allowance of 1.75% of the gross proceeds (other than the gross proceeds from the
sale of the Principal Stockholder Shares) of the Offering, (ii) a
non-accountable expense allowance for legal fees in an amount not to exceed the
lesser of (a) $100,000 and (b) 1% of the gross proceeds (other than the gross
proceeds from the sale of the Principal Stockholder Shares) of the Offering, and
(iii) an accountable expense allowance for disbursements of counsel to the
Underwriter.
    
 
                                       48
<PAGE>   51
 
   
     The Company also has agreed to sell to the Underwriter or its designees,
options to purchase a number of shares of Common Stock equal to 10% of the
number of shares of Common Stock (other than the Principal Stockholder Shares)
sold in the Offering at a price of $.001 per option. The Underwriter's Purchase
Options will be exercisable for a period of four years, commencing one year
after the date hereof, at an initial exercise price per share equal to 120% of
the public offering price per share. The Underwriter's Purchase Options cannot
be sold, transferred, assigned, or hypothecated for one year from the date of
their issuance, except that they may be assigned, in whole or in part, to any
member of the selling group which participated in the Offering or any successor,
officer or partner of the Underwriter or such member of the selling group.
    
 
   
     The exercise price of, and the number of shares of Common Stock underlying,
the Underwriter's Purchase Options are subject to adjustment in the event of
stock splits, stock dividends, or other similar events. In the event of any
reclassification, or other similar change of outstanding Common Stock, any
consolidation or merger involving the Company (other than a consolidation or
merger which does not result in any reclassification, or other similar change in
the outstanding Common Stock), or a sale, lease, or conveyance to another
corporation of the property of the Company as, or substantially as an entirety,
the Underwriter's Purchase Options will thereupon become exercisable only for
the kind and number of shares of stock or other securities, assets, or cash to
which a holder of the number of shares of Common Stock issuable (at the time of
such reclassification, consolidation, merger, or sale) upon exercise of the
Underwriter's Purchase Options would have been entitled upon such
reclassification, consolidation, merger, or sale.
    
 
   
     The holder of the Underwriter's Purchase Options has the right, in lieu of
payment in cash of the exercise price, to surrender all or part of the
Underwriter's Purchase Options in exchange for a number of shares of Common
Stock equal to the value of the Underwriter's Purchase Options being surrendered
(determined by subtracting the aggregate exercise price of the Underwriter's
Purchase Options being surrendered from the Current Market Value (as defined) of
the shares of Common Stock issuable upon exercise of the Underwriter's Purchase
Options being surrendered) divided by the Current Market Price of one share of
Common Stock.
    
 
   
     The Company has agreed that it will, on any two occasions during the
five-year period commencing on the date hereof, register the sale of the shares
of Common Stock underlying the Underwriter's Purchase Options at the request of
the holders of a majority of the shares of Common Stock issued or issuable upon
exercise of the Underwriter's Purchase Options. The Company also has agreed,
during the seven-year period commencing from the date hereof, to register on a
"piggyback" basis, on an unlimited number of occasions, such securities whenever
the Company files a registration statement. The Company will bear the expenses
of such registrations, except for any underwriting discounts and commissions and
fees and disbursements of counsel to the holders, and except that the holders
will bear the expenses of the second demand registration.
    
 
     For the life of the Underwriter's Purchase Options, the holders are given,
at nominal cost, the opportunity to profit if the price of the Company's Common
Stock in the public market exceeds the exercise price of the Underwriter's
Purchase Options, without assuming the risks or benefits of ownership, with a
resulting dilution in the interest of other security holders. If the public
price of the Company's Common Stock does not rise above the exercise price of
the Underwriter's Purchase Options during the exercise period, then such Options
will expire worthless. As long as the Underwriter's Purchase Options remain
unexercised, the terms under which the Company could obtain additional capital
may be adversely affected. Moreover, the holders of the Underwriter's Purchase
Options might be expected to exercise them at a time when the Company would, in
all likelihood, be able to obtain capital by a new offering of its securities on
terms more favorable than those provided by the Underwriter's Purchase Options.
 
     The Underwriter was registered as a broker-dealer and became a member of
the NASD in 1992 and has not participated in any public offerings as an
underwriter, though it has acted as syndicate member, sole placement agent,
co-placement agent, selected dealer, or sole participating broker in more than a
dozen public or private offerings.
 
     On May 10, 1995, the Underwriter was retained by the Company to introduce
the Company to a specified pharmaceutical company. If the Company and such
pharmaceutical company enter into certain transactions during the six-month term
of the agreement, the Underwriter is entitled to specified fees. The Company
also
 
                                       49
<PAGE>   52
 
agreed to indemnify the Underwriter against certain liabilities, and reimburse
the Underwriter for certain expenses, relating to the agreement.
 
   
     The Company, for a period of 12 months; the Company's directors and senior
officers (who own in the aggregate 16,100 shares of Common Stock and options and
warrants to purchase 1,597,000 shares of Common Stock), for a period of 12
months; the Company's other officers (who own in the aggregate 1,500 shares of
Common Stock and options and warrants to purchase 315,000 shares of Common
Stock), for a period of six months; and the Company's principal stockholders
(who after consummation of the Offering will own in the aggregate 13,523,816
shares of Common Stock and no options and warrants to purchase shares of Common
Stock), for a period of 24 months (except that each such principal stockholder
will be permitted to sell not more than 12.9% of its shares of Common Stock
during the second 12 month period), have agreed (subject to certain exceptions)
not to sell, directly or indirectly, any of their shares of Common Stock,
without the consent of the Underwriter and the Company. However, certain of such
principal stockholders have pledged an aggregate of 9,502,148 shares of Common
Stock beneficially owned by them to their respective banks as collateral to
secure indebtedness owed to such banks. Any shares acquired by lenders pursuant
to such pledge arrangements would not be subject to any agreements not to sell.
Moreover, the Company and the Underwriter may, in their sole discretion and any
time without notice, release all or any portion of the securities subject to
agreements not to sell.
    
 
                                       50
<PAGE>   53
 
                           DESCRIPTION OF SECURITIES
 
GENERAL
 
   
     The Company is authorized to issue 40,000,000 shares of Common Stock. As of
July 31, 1995, 22,448,768 shares of Common Stock were outstanding. In addition,
3,750,350 shares of Common Stock were reserved for issuance upon exercise of
outstanding warrants and options. If the maximum number of shares of Common
Stock are sold in the Offering, 34,448,768 shares of Common Stock will be
outstanding and 4,873,682 shares of Common Stock will be reserved for issuance
upon exercise of outstanding warrants and options. In such case, the Company
will consider seeking the approval of the stockholders of the Company to
increase the number of authorized shares of Common Stock.
    
 
COMMON STOCK
 
     Each outstanding share of Common Stock entitles the holder to one vote on
all matters requiring a vote of stockholders. Since the Common Stock does not
have cumulative voting rights, the holders of shares having more than 50% of the
voting power, if they choose to do so, may elect all the directors of the
Company and the holders of the remaining shares would not be able to elect any
directors. See "Principal Stockholders."
 
     Subject to the rights of holders of any series of preference stock that may
be issued in the future, the holders of the Common Stock are entitled to receive
dividends when, as and if declared by the Board of Directors out of funds
legally available therefor. See "Price Range of Common Stock and Dividend
Policy." In the event of a voluntary or involuntary liquidation of the Company,
all shareholders are entitled to a pro rata distribution of the assets of the
Company remaining after payment of claims of creditors and liquidation
preferences of any preferred stock.
 
     The transfer agent for the Common Stock is Harris Trust Company of New
York, 77 Water Street, New York, New York 10005.
 
PREFERRED STOCK
 
     The Company is authorized to issue 5,000,000 shares of Preferred Stock,
none of which is outstanding, the terms of which may be fixed by the Board of
Directors. It is not possible to state the actual effect of any issuance of one
or more series of preferred stock upon the rights of holders of Common Stock
until the Board of Directors of the Company determines the respective rights of
the holders of one or more series of the preferred stock. Such effects might,
however, include: (a) reduction of the amount of funds otherwise available for
payment of cash dividends on Common Stock; (b) restrictions on the payment of
cash dividends on Common Stock; (c) dilution of the voting power of the Common
Stock, to the extent that any series of issued preferred stock has voting rights
or is convertible into Common Stock; and (d) the holders of Common Stock not
being entitled to share in the assets of the Company upon liquidation until
satisfaction of liquidation preferences, if any, in respect of any outstanding
series of preferred stock. Additionally, preferred stock may be issued through a
depositary mechanism thereby increasing the amount of preferred stock that could
be issued.
 
                                 LEGAL MATTERS
 
     The legality of the securities offered hereby will be passed on for the
Company by Lawrence M. Gordon, General Counsel of the Company. Mr. Gordon does
not own any shares of Common Stock but has options to purchase 212,500 shares of
Common Stock, 187,500 of which are currently exercisable. Certain other legal
matters will be passed on for the Company by Duane, Morris & Heckscher, New
York, New York. Certain legal matters relating to FDA regulations will be passed
on for the Company by Kleinfeld, Kaplan & Becker, Washington, D.C. Certain legal
matters in connection with the Offering have been passed upon for the
Underwriter by Squadron, Ellenoff, Plesent & Sheinfeld, LLP, New York, New York.
 
                                       51
<PAGE>   54
 
                                    EXPERTS
 
     The audited consolidated financial statements of the Company and its
subsidiary at December 31, 1994 and 1993, and for each of the years in the three
year period ended December 31, 1994 included herein have been included herein in
reliance upon the report of KPMG Peat Marwick LLP, independent certified public
accountants, included herein, and upon the authority of said firm as experts in
auditing and accounting. The report of KPMG Peat Marwick LLP contains an
explanatory paragraph that states that the Company's recurring losses from
operations and accumulated deficit raise substantial doubt about its ability to
continue as a going concern. The consolidated financial statements do not
include any adjustments that might result from the outcome of this uncertainty.
 
                             ADDITIONAL INFORMATION
 
     The Company has filed with the Commission a Registration Statement on Form
S-2 under the Securities Act with respect to the shares of Common Stock being
offered by this Prospectus. This Prospectus does not contain all of the
information set forth in the Registration Statement and the exhibits thereto,
certain portions of which have been omitted as permitted by the rules and
regulations of the Commission. For further information with respect to the
Company and the Offering, reference is made to the Registration Statement,
including the exhibits thereto, which may be inspected without charge at the
Commission's principal office at 450 Fifth Street, N.W., Washington, D.C. 20549.
Copies of the Registration Statement may be obtained from the Commission at its
principal office upon payment of prescribed fees. Statements contained in this
Prospectus as to the contents of any contract or other document are not
necessarily complete, and in each instance where such contract or other document
is an exhibit to the Registration Statement, reference is made to the copy of
such contract or other document filed as an exhibit to the Registration
Statement, each statement being qualified in all respects by such reference.
 
                                       52
<PAGE>   55
 
                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                                        PAGE
                                                                                        ----
<S>                                                                                     <C>
Independent Auditors' Report..........................................................  F-2
Financial Statements:
  Consolidated Balance Sheets -- December 31, 1994 and 1993...........................  F-3
  Consolidated Statements of Operations -- Years ended December 31, 1994, 1993 and
     1992.............................................................................  F-4
  Consolidated Statements of Changes in Stockholders' Equity -- Years ended December
     31, 1994, 1993 and 1992..........................................................  F-5
  Consolidated Statements of Cash Flows -- Years ended December 31, 1994, 1993 and
     1992.............................................................................  F-6
Notes to Consolidated Financial Statements............................................  F-7
Unaudited Financial Statements:
  Consolidated Condensed Balance Sheets -- March 31, 1995 and December 31, 1994.......  F-20
  Consolidated Condensed Statements of Operations -- Three Months ended March 31, 1995
     and 1994.........................................................................  F-21
  Consolidated Condensed Statement of Changes in Stockholders' Equity -- Three Months
     ended March 31, 1995.............................................................  F-22
  Consolidated Condensed Statements of Cash Flows -- Three Months ended March 31, 1995
     and 1994.........................................................................  F-23
Notes to Consolidated Condensed Financial Statements..................................  F-24
</TABLE>
 
                                       F-1
<PAGE>   56
 
                          INDEPENDENT AUDITORS' REPORT
 
The Board of Directors and Stockholders
Interferon Sciences, Inc.:
 
     We have audited the consolidated financial statements of Interferon
Sciences, Inc. and subsidiary as listed in the accompanying index. These
consolidated financial statements are the responsibility of the Company's
management. Our responsibility is to express an opinion on these consolidated
financial statements based on our audits.
 
     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
     In our opinion, the consolidated financial statements referred to above
present fairly, in all material respects, the financial position of Interferon
Sciences, Inc. and subsidiary at December 31, 1994 and 1993, and the results of
their operations and their cash flows for each of the years in the three-year
period ended December 31, 1994 in conformity with generally accepted accounting
principles.
 
     The accompanying consolidated financial statements have been prepared
assuming that the Company will continue as a going concern. As discussed in Note
3 to the consolidated financial statements, the Company has suffered recurring
losses from operations and has an accumulated deficit that raise substantial
doubt about its ability to continue as a going concern. Management's plans in
regard to these matters are also described in Note 3. The consolidated financial
statements do not include any adjustments that might result from the outcome of
this uncertainty.
 
     As discussed in Note 7, the Company has adopted SFAS No. 115, "Accounting
for Certain Investments in Debt and Equity Securities", as of January 1, 1994.
 
                                          KPMG Peat Marwick LLP
 
New York, New York
April 3, 1995
 
                                       F-2
<PAGE>   57
 
                    INTERFERON SCIENCES, INC. AND SUBSIDIARY
 
                          CONSOLIDATED BALANCE SHEETS
 
<TABLE>
<CAPTION>
                                                                          DECEMBER 31,
                                                                  -----------------------------
                                                                      1994             1993
                                                                  ------------     ------------
<S>                                                               <C>              <C>
ASSETS
CURRENT ASSETS
  Cash and cash equivalents.....................................  $    330,617     $  4,247,067
  Marketable securities.........................................                      4,294,391
  Accounts and other receivables................................        35,546           87,649
  Inventories...................................................     1,029,158        2,159,005
  Consignment inventory.........................................       220,410
  Receivables from affiliated companies, net....................        20,001           18,501
  Prepaid expenses and other current assets.....................        55,221          210,179
                                                                  ------------     ------------
TOTAL CURRENT ASSETS............................................     1,690,953       11,016,792
                                                                  ------------     ------------
PROPERTY, PLANT AND EQUIPMENT, AT COST
  Land..........................................................       140,650          140,650
  Buildings and improvements....................................     7,384,102        7,384,102
  Equipment.....................................................     4,301,317        4,218,819
                                                                  ------------     ------------
                                                                    11,826,069       11,743,571
  Less accumulated depreciation and amortization................    (6,013,839)      (5,247,568)
                                                                  ------------     ------------
                                                                     5,812,230        6,496,003
                                                                  ------------     ------------
INTANGIBLE ASSETS, NET OF ACCUMULATED AMORTIZATION OF $1,300,000
  AND $1,080,091
  Patent and deferred financing costs...........................       355,019          313,842
PREPAID ROYALTIES...............................................                      2,100,000
OTHER ASSETS....................................................       323,900          373,900
                                                                  ------------     ------------
                                                                  $  8,182,102     $ 20,300,537
                                                                   ===========      ===========
LIABILITIES AND STOCKHOLDERS' EQUITY
CURRENT LIABILITIES
  Current maturities of long-term debt..........................  $    409,275     $  1,999,313
  Accounts payable..............................................       882,090          610,451
  Accrued expenses..............................................       746,935          414,215
  Amount due NPDC...............................................       134,347            8,050
  Amount due Purdue for repurchase of common stock..............       300,000
                                                                  ------------     ------------
TOTAL CURRENT LIABILITIES.......................................     2,472,647        3,032,029
                                                                  ------------     ------------
LONG-TERM DEBT LESS CURRENT MATURITIES..........................                        137,951
                                                                  ------------     ------------
COMMON STOCK SUBJECT TO REPURCHASE COMMITMENT (682,494
  SHARES).......................................................     2,729,976
                                                                  ------------     ------------
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY
  Preferred stock, par value $.01 per share;
     authorized -- 5,000,000 shares; none issued and
     outstanding................................................
  Common stock, par value $.01 per share;
     authorized -- 40,000,000 and 30,000,000 shares; issued and
     outstanding -- 19,509,291 and 19,464,285 shares............       195,093          194,643
Capital in excess of par value..................................    65,572,243       67,646,234
Accumulated deficit.............................................   (62,787,857)     (50,710,320)
                                                                  ------------     ------------
TOTAL STOCKHOLDERS' EQUITY......................................     2,979,479       17,130,557
                                                                  ------------     ------------
                                                                  $  8,182,102     $ 20,300,537
                                                                   ===========      ===========
</TABLE>
 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.
 
                                       F-3
<PAGE>   58
 
                    INTERFERON SCIENCES, INC. AND SUBSIDIARY
 
                     CONSOLIDATED STATEMENTS OF OPERATIONS
                  YEARS ENDED DECEMBER 31, 1994, 1993 AND 1992
 
<TABLE>
<CAPTION>
                                                             1994          1993          1992
                                                         ------------   -----------   -----------
<S>                                                      <C>            <C>           <C>
REVENUES
Sales
  Alferon N Injection..................................  $    979,425   $             $ 3,267,351
  Research products and other revenues.................       186,506        51,323        39,046
                                                         ------------   -----------   -----------
          Total revenues...............................     1,165,931        51,323     3,306,397
                                                         ------------   -----------   -----------
COSTS AND EXPENSES
  Cost of goods sold and excess/idle production
     costs.............................................     2,778,109     1,880,563     3,162,670
  Research and development (net of $150,000, $138,996
     and $141,996 of rental income received from
     NPDC).............................................     5,195,699     4,151,158     3,983,195
  General and administrative (includes $1,314,380,
     $1,015,700 and $984,615 of charges from NPDC for
     management fees and reimbursements of expenses)...     4,974,224     2,366,897     2,113,493
                                                         ------------   -----------   -----------
          Total costs and expenses.....................    12,948,032     8,398,618     9,259,358
                                                         ------------   -----------   -----------
LOSS FROM OPERATIONS...................................   (11,782,101)   (8,347,295)   (5,952,961)
  Interest and other income............................       157,929       255,344       544,322
  Net (loss) gain on sales of marketable securities....      (300,430)        3,297       (24,922)
  Interest expense.....................................      (152,935)     (371,208)     (563,294)
                                                         ------------   -----------   -----------
NET LOSS...............................................  $(12,077,537)  $(8,459,862)  $(5,996,855)
                                                          ===========    ==========    ==========
NET LOSS PER SHARE.....................................  $       (.62)  $      (.55)  $      (.42)
                                                          ===========    ==========    ==========
Weighted average number of shares outstanding..........    19,594,285    15,432,287    14,356,718
                                                          ===========    ==========    ==========
</TABLE>
 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.
 
                                       F-4
<PAGE>   59
 
                    INTERFERON SCIENCES, INC. AND SUBSIDIARY
 
           CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY
                  YEARS ENDED DECEMBER 31, 1994, 1993 AND 1992
 
<TABLE>
<CAPTION>
                                                                    COMMON STOCK        CAPITAL IN                      TOTAL
                                                                ---------------------    EXCESS OF    ACCUMULATED    STOCKHOLDERS'
                                                                  SHARES      AMOUNT     PAR VALUE      DEFICIT         EQUITY
                                                                ----------   --------   -----------   ------------   ------------
<S>                                                             <C>          <C>        <C>           <C>            <C>
BALANCE AT DECEMBER 31, 1991..................................  13,931,218   $139,312   $55,159,459   $(36,253,603)  $ 19,045,168
Proceeds from exercise of common stock warrants...............     432,600      4,326     2,952,163                     2,956,489
Proceeds from exercise of common stock options................      47,300        473       151,933                       152,406
Net loss......................................................                                          (5,996,855)    (5,996,855)
                                                                ----------   --------   -----------   ------------   ------------
BALANCE AT DECEMBER 31, 1992..................................  14,411,118    144,111    58,263,555    (42,250,458)    16,157,208
Net proceeds from issuance of common stock and warrants to D.
  Blech.......................................................   5,000,000     50,000     9,200,501                     9,250,501
Issuance of common stock as required by various agreements....      40,967        410       142,975                       143,385
Proceeds from exercise of common stock options................      12,200        122        39,203                        39,325
Net loss......................................................                                          (8,459,862)    (8,459,862)
                                                                ----------   --------   -----------   ------------   ------------
BALANCE AT DECEMBER 31, 1993..................................  19,464,285    194,643    67,646,234    (50,710,320)    17,130,557
Net proceeds from sale of common stock and warrants...........     610,000      6,100     1,470,335                     1,476,435
Commitment to purchase common stock from Purdue Frederick,
  Runham and Banela...........................................    (994,994)    (9,950)   (3,970,026)                   (3,979,976)
Net proceeds from the sale of common stock to Sentinel
  Charitable Remainder Trust..................................     430,000      4,300       425,700                       430,000
Net loss......................................................                                         (12,077,537)   (12,077,537)
                                                                ----------   --------   -----------   ------------   ------------
BALANCE AT DECEMBER 31, 1994..................................  19,509,291   $195,093   $65,572,243   $(62,787,857)  $  2,979,479
                                                                ==========   ========   ===========   ============   ============
</TABLE>
 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.
 
                                       F-5
<PAGE>   60
 
                    INTERFERON SCIENCES, INC. AND SUBSIDIARY
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                  YEARS ENDED DECEMBER 31, 1994, 1993 AND 1992
 
<TABLE>
<CAPTION>
                                                         1994            1993            1992
                                                     ------------     -----------     -----------
<S>                                                  <C>              <C>             <C>
CASH FLOWS USED FOR OPERATIONS:
  Net loss.........................................  $(12,077,537)    $(8,459,862)    $(5,996,855)
  Adjustments to reconcile net loss to net cash
     used for operating activities:
     Depreciation and amortization.................     2,926,439       1,017,949       1,039,114
     Reduction of other assets.....................        50,000
  Net loss (gain) on sales of marketable                  300,430          (3,297)         24,922
     securities....................................
  Retirements of property, plant and equipment.....                                        14,271
  Change in operating assets and liabilities:
     Receivables from affiliated companies.........        (1,500)          1,500          (3,861)
     Inventories...................................     1,129,847         (49,752)       (831,091)
     Consignment inventory.........................      (220,410)
     Accounts and other receivables................      (647,897)         12,023       1,209,682
     Prepaid expenses and other current assets.....       154,958        (162,338)        (38,025)
     Accounts payable and accrued expenses.........       604,359        (148,859)        213,843
                                                     ------------     -----------     -----------
          Net cash used for operations.............    (7,781,311)     (7,792,636)     (4,368,000)
                                                     ------------     -----------     -----------
CASH FLOWS FROM INVESTING ACTIVITIES:
  Sales of marketable securities...................     6,490,406       4,153,719       5,455,958
  Purchases of marketable securities...............    (2,496,445)     (3,891,422)     (3,062,531)
  Additions to property, plant and equipment.......       (82,498)        (87,412)       (251,511)
  Additions to intangible and other assets.........      (101,345)        (84,537)       (208,216)
                                                     ------------     -----------     -----------
          Net cash provided by investing                
            activities.............................     3,810,118          90,348       1,933,700
                                                     ------------     -----------     -----------
CASH FLOWS FROM FINANCING ACTIVITIES:
  Net proceeds from purchase agreement with D.            
     Blech.........................................       430,000       9,355,500
  Net proceeds from sale of common stock and            
     warrants......................................     1,476,435
  Increase (decrease) in advances from NPDC........       126,297         (38,627)        (77,888)
  Reduction of long-term debt......................    (1,727,989)     (1,542,481)     (1,187,895)
  Purchase of common stock from Runham and               
     Banela........................................      (250,000)
  Proceeds from exercise of common stock options...                        39,325         152,406
  Proceeds from exercise of common stock                                                
     warrants......................................                                     2,956,489
                                                     ------------     -----------     -----------
          Net cash provided by financing                   
            activities.............................        54,743       7,813,717       1,843,112
                                                     ------------     -----------     -----------
Net (decrease) increase in cash and cash               
  equivalents......................................    (3,916,450)        111,429        (591,188)
Cash and cash equivalents at beginning of year.....     4,247,067       4,135,638       4,726,826
                                                     ------------     -----------     -----------
Cash and cash equivalents at end of year...........  $    330,617     $ 4,247,067     $ 4,135,638
                                                     ------------     -----------     -----------
Cash paid for interest expense.....................  $    205,190     $   329,643     $   505,385
                                                     ------------     -----------     -----------
NON CASH INVESTING AND FINANCING ACTIVITIES:
  Issuances of common stock in payment of            
     liabilities...................................  $                $   143,385     $
  Commitment to purchase common stock..............  $  3,729,976     $               $
  Offset of receivables in settlement of obligation  
     to repurchase stock...........................  $    700,000     $               $
</TABLE>
 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.
 
                                       F-6
<PAGE>   61
 
                    INTERFERON SCIENCES, INC. AND SUBSIDIARY
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
NOTE 1.  ORGANIZATION, BUSINESS, TRANSACTIONS WITH NPDC AND OTHER BUSINESS
 
     Since January 1981, Interferon Sciences, Inc. (the "Company") has been
primarily engaged in the research and development of pharmaceutical products
containing alpha interferon for the treatment of viral diseases, cancers and
diseases of the immune system. ALFERON N Injection is a preparation for the
treatment of genital warts by local injection. In October 1989, the Company
received from the Food and Drug Administration ("FDA") approval to market
ALFERON N Injection for the intralesional treatment of refractory or recurring
external genital warts in patients 18 years of age or older. Nationwide
distribution of ALFERON N Injection commenced during July 1991 (See Note 5).
Additional products under development by the Company include ALFERON LDO and
ALFERON N Gel. ALFERON LDO is a low dose oral liquid alpha interferon
preparation which the Company believes has potential for treating HIV-infected
individuals and possibly other viral diseases. ALFERON N Gel is a topical
interferon preparation which the Company believes has potential in the treatment
of cervical dysplasia, recurrent genital herpes, other viral diseases and
cancers (See Note 6).
 
     The Company is a party to a management agreement with National Patent
Development Corporation ("NPDC") pursuant to which certain legal, financial and
administrative services have been provided by employees of NPDC. The fee for
such services in 1994, 1993 and 1992 was $120,000 annually. In addition, NPDC
provides to the Company, at its estimated cost, certain personnel and services
which the Company uses in its operations. For the years ended December 31, 1994,
1993 and 1992, such charges amounted to $1,194,380, $895,700 and $864,615,
respectively. The Company is also covered under NPDC's insurance policies except
for certain policies which the Company has in its own name beginning in 1994.
The Company's allocated portion of insurance costs was $114,000, $291,000 and
$210,000 for the years ended December 31, 1994, 1993 and 1992, respectively.
 
     The Company owns the buildings which contain its offices and laboratories
and presently leases out a portion of the buildings to NPDC. The Company and
NPDC have entered into an agreement for the sharing of the office, warehouse and
laboratory facilities. Total occupancy costs for the years ended December 31,
1994, 1993 and 1992 were approximately $760,000, $686,000 and $751,000,
respectively. NPDC paid to the Company as rent NPDC's proportionate share of
such occupancy costs (based on both square feet occupied and number of
personnel), which amounted to $150,000, $138,996 and $141,996, respectively.
 
     On June 19, 1990, the Company and NPDC entered into an agreement pursuant
to which the Company agreed to issue warrants to purchase up to approximately
1.1 million shares of Common Stock in connection with NPDC's Exchange Offer (the
"Offer"). For each warrant issued by the Company, NPDC agreed to reduce by $.80
the debt owed it by the Company. On August 10, 1990, the Offer expired and the
Company issued warrants to purchase 465,900 shares of Common Stock exercisable
at a price of $6.88 per share until August 16, 1992 and the debt owed by the
Company to NPDC was reduced by $372,720. During February 1992 the warrants were
called by the Company resulting in net proceeds to the Company of $2,956,000
from the issuance of 432,600 shares of the Company's Common Stock upon exercise
of the warrants.
 
     See Note 15 for information with respect to royalty obligations to NPDC.
 
TRANSACTIONS WITH DAVID BLECH
 
     On May 28, 1993, David Blech, the Chief Executive Officer, sole shareholder
and a director of D. Blech & Company, Incorporated ("DBC"), and the Company
entered into a Purchase Agreement (the "Purchase Agreement"), pursuant to which
David Blech or his designees purchased for $4.00 per unit, an aggregate of
2,500,000 units ("Units"), each Unit consisting of two shares of Common Stock,
one Class A Warrant (the "Class A Warrants") to purchase one share of Common
Stock at an exercise price of $3.25 per share and one Class B Warrant (the
"Class B Warrants") to purchase one share of Common Stock at an exercise price
of $5.00 per share. The Class A Warrants and the Class B Warrants expire on
August 31, 2000. The purchasers
 
                                       F-7
<PAGE>   62
 
                    INTERFERON SCIENCES, INC. AND SUBSIDIARY
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
have certain registration rights as to the securities acquired by them under the
Purchase Agreement. Under the Purchase Agreement, Mr. Blech has the right to
cause the Company to use its best efforts to nominate two designees of Mr. Blech
to the Board of Directors of the Company as long as Mr. Blech and the other
purchasers under the Purchase Agreement beneficially own, in the aggregate, at
least 2,000,000 shares of Common Stock. To date, Mr. Blech has not exercised
such nomination rights. The Company paid DBC a $500,000 fee for its services in
connection with the Purchase Agreement, and incurred $100,000 in legal and other
fees. In addition, fees totalling approximately $105,000 relating to this
transaction were paid by issuance of Common Stock to another party.
 
     Concurrently with the execution of the Purchase Agreement, the Company
entered into a consulting agreement with DBC under which the Company agreed to
pay $100,000 per year, payable monthly, to DBC for advisory services with
respect to the Company's field of interest and business, strategic and
commercial matters related to the biotechnology industry. The term of the
consulting agreement was one year and commenced on June 1, 1993.
 
     On May 13, 1994, the Company filed a registration statement with the
Securities and Exchange Commission, which statement was amended on July 1, 1994
and was subsequently amended again on August 10, 1994, covering a proposed
public offering of 2,000,000 shares of Common Stock through DBC as underwriter.
On September 22, 1994, DBC could not meet certain minimum capital requirements
and was forced to discontinue its operations. Consequently, the Company had to
cancel the proposed public offering of Common Stock.
 
   
     On December 6, 1994, the Company entered into a Purchase and Exchange
Agreement with David Blech and certain other parties pursuant to which Sentinel
Charitable Remainder Trust purchased 430,000 shares of the Common Stock for
$430,000. In addition, pursuant to such agreement David Blech and another
individual agreed to exchange an aggregate of 462,500 Class A Warrants and
1,200,000 Class B Warrants for an aggregate of 332,500 shares of Common Stock.
The issuance and exchange of the shares of Common Stock by David Blech and the
other individual pursuant to the Purchase and Exchange Agreement were completed
during the first quarter of 1995.
    
 
NOTE 2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
     Principles of consolidation -- The financial statements include the
operations of the Company and Interferon Sciences Development Corporation (ISD),
its wholly owned subsidiary.
 
     Statements of cash flows -- For purposes of the statements of cash flows,
the Company considers all highly liquid instruments with maturities of three
months or less from purchase date to be cash equivalents.
 
     Property, plant and equipment -- Property, plant and equipment are carried
at cost. Major additions and betterments are capitalized while maintenance and
repairs which do not extend the lives of the assets are expensed currently.
 
     Depreciation -- The Company provides for depreciation and amortization of
plant and equipment following the straight-line method over the estimated useful
lives of such assets as follows:
 
<TABLE>
<CAPTION>
                                                                          ESTIMATED
                               CLASS OF ASSETS                           USEFUL LIVES
        --------------------------------------------------------------  --------------
        <S>                                                             <C>
        Buildings and Improvements....................................  15 to 30 years
        Equipment.....................................................  5 to 10 years
</TABLE>
 
     Intangible assets -- The Company capitalizes costs to obtain and maintain
patents and licenses. Patent costs are amortized over 17 years and license costs
are amortized over 5 years, each on a straight-line basis. To the extent a
patent is determined to be worthless, the related capitalized cost is
immediately expensed. The Company also capitalizes costs incurred to obtain
long-term debt financing. Such costs are amortized on the straight-line basis
over the term of the related debt and are classified as interest expense.
 
                                       F-8
<PAGE>   63
 
                    INTERFERON SCIENCES, INC. AND SUBSIDIARY
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     Revenue recognition -- Sales are recorded generally upon shipment of
product. However, when a sale is made subject to a right of return, revenues are
not recognized until notification by the customer that the product has been
resold, and the related product is recorded as consignment inventory until such
notification.
 
     Collaborative agreement research and development revenues and costs -- The
costs of performing research and development are reported when incurred and are
included in research and development expenses and the purchase of equipment in
accordance with the nature of the costs incurred. Generally, the Company matches
its collaborative research and development revenues in the same accounting
periods in which the related research costs are incurred. However, when the
revenues are exhausted, the Company has the option to continue the research
activities at its own expense.
 
     Inventories -- Inventories, consisting of raw materials, work in process
and finished goods, are stated at the lower of cost or market on a FIFO basis.
Inventories, if any, which are expected to become obsolete before sale or use in
research are written off.
 
     Pension plan -- The Company's employees are included in NPDC's pension
plan. The Company provides for its allocable share of such costs as they accrue.
Effective December 31, 1991, the plan benefits were frozen (See Note 12).
 
     Net loss per share -- Net loss per share is based on the weighted average
number of shares of Common Stock outstanding during the period.
 
NOTE 3.  LIQUIDITY
 
     The Company has experienced significant operating losses since its
inception in 1980. As of December 31, 1994, the Company had an accumulated
deficit of approximately $62.8 million. For the years ended December 31, 1994,
1993 and 1992, the Company had losses from operations of approximately $11.8
million, $8.3 million, and $6.0 million, respectively. Although the Company
received FDA approval to market ALFERON N Injection in October 1989, it has had
only limited revenue from the sale of ALFERON N Injection. In order for the
Company to operate profitably, the Company must sell significantly more ALFERON
N Injection. Increased sales will depend primarily upon the expansion of
existing markets and/or successful attainment of FDA approval to market ALFERON
N Injection for additional uses, of which there can be no assurance. There can
be no assurance that sufficient quantities of ALFERON N Injection will be sold
to allow the Company to operate profitably.
 
     The Company has limited financial resources as of December 31, 1994 with
which to support future operating activities and to satisfy its financial
obligations as they become payable, including the repurchase of 682,494 shares
of Common Stock from Purdue for $2,729,976. Consequently, management is
continuing to actively pursue raising additional capital by either (i) issuing
securities in a public or private equity offering, (ii) licensing rights to its
injectable, topical or oral formulations of alpha interferon, or (iii) entering
into collaborative or other arrangements with corporate partners. Insufficient
funds will require the Company to delay, scale back, or eliminate certain or all
of its activities or license third parties to commercialize products or
technologies that the Company would otherwise seek to develop itself and may
cause the Company to be in default under its agreements with Purdue and other
parties.
 
NOTE 4.  AGREEMENTS WITH HOFFMANN-LAROCHE
 
     In June 1988, Hoffmann-LaRoche, Inc. ("Roche") and the Company entered into
an agreement (the "1988 License Agreement") pursuant to which the Company
received a license from Roche, under a U.S. Patent held by Roche, which enables
the Company to sell ALFERON N Injection in the United States for the treatment
of genital warts. As part of the 1988 License Agreement, Roche received 100,000
shares of Common Stock in June 1988, the value of which was recorded as a
license cost on the balance sheet in 1988. In addition, when the Company granted
marketing rights to an affiliate of The Purdue Frederick Company
 
                                       F-9
<PAGE>   64
 
                    INTERFERON SCIENCES, INC. AND SUBSIDIARY
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
(Purdue Frederick, and together with its affiliates, "Purdue") for the
distribution of ALFERON N Injection (See Note 5), the Company became obligated
to pay Roche $250,000, payable in two equal installments of $125,000. The first
installment was paid in May 1989 and the second was paid in May 1990. Such
obligation was recorded by the Company as an additional license cost in 1988.
The 1988 License Agreement also requires the Company to pay Roche a royalty of
8% on Purdue's net sales of ALFERON N Injection.
 
     In January 1991, the 1988 License Agreement was amended to require the
Company to pay Roche a royalty of 8% on the Company's net sales (as defined) of
ALFERON N Injection up to $20,000,000 and 9.5% of net sales in excess of
$20,000,000 in any calendar year and the license was expanded to allow the
Company to sell ALFERON N Injection for diseases which are refractory to
recombinant interferon therapy.
 
     Finally, as a result of receiving FDA approval for ALFERON N Injection in
1989, the Company was obligated to issue 484,262 shares to Roche as a prepaid
royalty against future net sales by the Company. Such shares, valued at
$2,100,000, were issued in February 1990. The value of the Common Stock
previously issued for the license as well as the additional license cost of
$250,000 recorded in 1988 are also to be credited against future royalties
payable to Roche. Through December 31, 1994, the Company had incurred $614,794
of royalties due Roche resulting from sales of ALFERON N Injection. However, the
Company applied $575,617 of the prepayments previously made to Roche against the
amount due. The value of the Company's Common Stock which may be credited
against royalties payable is the lesser of its value on the date of issuance and
on the date the Company exercises its right to credit such stock against its
royalty obligations. As of December 31, 1994, based upon the market value of the
Common Stock, the Company had approximately $459,485 of credits available to
offset its future royalty obligations to Roche.
 
     In January 1991, the Company and Roche signed an agreement (the "Roche Gel
Agreement") pursuant to which the Company can obtain supplies of Roche's bulk
purified recombinant interferon for use in the Company's topical products,
thereby eliminating the need for the Company to build a recombinant interferon
manufacturing facility. Alternatively, under the Roche Gel Agreement, the
Company can use its own natural alpha interferon in ALFERON Gel under a license
from Roche.
 
     In March 1992, the Company obtained a non-exclusive license from Roche,
which allows the Company to make, have made, use and sell in the United States,
without a potential patent infringement claim from Roche, natural alpha
interferon for the oral treatment of human diseases.
 
     On May 6, 1994, the United States Patent and Trademark Office issued an
Office Action in Reexamination on the Roche patent and rejected all of the 14
claims in the Roche patent. Claims in a patent under reexamination are valid and
enforceable until such time as a final disposition on the claims is reached. On
July 11, 1994, Roche filed a response objecting to the Patent Office's rejection
of such claims. The outcome of such reexamination of the Roche patent cannot be
determined at this time. Accordingly, the Company is unable to determine the
expected impact of such reexamination of the Roche patent on the Company's
liquidity and capital resources.
 
     During the second quarter of 1994, the Company adopted a policy of
amortizing prepaid royalties at the greater of the straight line rate over a
five-year period or the amount of royalties incurred based upon sales. During
the third quarter of 1994, the Company, in its quarterly evaluation of whether
the unamortized balance of prepaid royalties is realizable, determined that it
was prudent to write off such prepaid royalties. The Company based this decision
on the reduced market price during the third quarter of the Company's Common
Stock, the uncertainty created by the decision of the United States Patent and
Trademark Office in May 1994 to reexamine the claims of the Hoffmann patent and
upon sales of ALFERON N Injection. During 1994, the amortization and writeoff of
prepaid royalties totalling $2,100,000 were included as general and
administrative expense in the statements of operations and reflected as
depreciation and amortization in the statements of cash flows.
 
                                      F-10
<PAGE>   65
 
                    INTERFERON SCIENCES, INC. AND SUBSIDIARY
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
NOTE 5.  AGREEMENTS WITH THE PURDUE FREDERICK COMPANY
 
     As of November 1, 1988, the Company and Purdue entered into a marketing
agreement pursuant to which ALFERON N Injection would be manufactured by the
Company and marketed by Purdue in the United States subsequent to FDA approval,
which was received in October 1989, and certain foreign countries upon receipt
of foreign regulatory approval. The Company manufactures and sells the product
to Purdue on an exclusive basis. Pursuant to the terms of the agreement, the
Company: (a) records the sale of the product upon transfer to Purdue and (b) may
receive a royalty from Purdue based upon the net sales price received by Purdue
for the resale of ALFERON N Injection. In November 1990, the Company and Purdue
entered into an amendment to the original marketing agreement.
 
     In December 1991, Purdue agreed to purchase an aggregate of 45,000 vials of
ALFERON N Injection from the Company over approximately a six-month period which
commenced in March 1992 and was completed in September 1992. During the year
ended December 31, 1992, the Company completed this order and the balance of a
prior order for approximately 19,500 vials of ALFERON N Injection. Purdue did
not order any ALFERON N Injection from the Company during 1993.
 
     On January 27, 1994, the Company reacquired marketing and distribution
rights for ALFERON N Injection from Mundipharma Pharmaceutical Company
("Mundipharma"), an affiliate of Purdue Frederick, for Australia, Austria,
Belgium, Denmark, Finland, France, Germany, Greece, India, Ireland, Israel,
Italy, Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland
and the United Kingdom. Mundipharma and its affiliate, Purdue Pharma L.P.
("Purdue Pharma"), retained exclusive marketing and distribution rights for
Canada and the United States, respectively, subject to an 18-month option
granted to the Company to reacquire the United States and Canadian marketing and
distribution rights under certain terms and conditions. Purdue gave the Company
a new purchase order for 45,000 vials of ALFERON N Injection at an agreed upon
price. In addition, the Company will pay Mundipharma a 3% royalty on sales in
the reacquired territories. This rate will be reduced to 1% after certain
aggregate royalty payments have been made. The Company is also obligated to
provide Purdue with up to 15,000 vials of ALFERON N Injection, at an agreed upon
reduced price, to replace any inventory of Purdue existing on the date of the
amendment which goes out of date. The Company also granted Purdue an option,
exercisable until July, 1995, to purchase an additional 100,000 vials of ALFERON
N Injection at an agreed upon reduced price.
 
     Under the amended agreements, the Company will take over responsibility for
the clinical development of all additional potential uses of ALFERON N
Injection. Upon the Company obtaining approval in the United States for
additional uses of ALFERON N Injection, Purdue Pharma and Mundipharma will be
obligated, in order to maintain their exclusive license, to repay certain of the
Company's research and development costs and make certain additional payments to
the Company for the rights for the first five of any such new uses.
 
     The Company also agreed to buy back 994,994 shares of the Common Stock then
held by Purdue at an agreed upon price of $4.00 per share (the "Company Purchase
Obligation"). These shares were to be paid for over an 18-month period. In
January 1994, the Company purchased 62,500 shares for $250,000 and such shares
were cancelled by the Company. The Company was to pay an additional $1,000,000
to purchase 250,000 shares during 1994 and $2,729,976 to purchase 682,494 shares
during 1995, which shares would also be cancelled by the Company. In 1994, the
Company and Purdue agreed to offset $700,000 owed to the Company by Purdue, for
the purchase of ALFERON N Injection during 1994, against the Company's
obligation to purchase $1,000,000 of Common Stock from Purdue in 1994. The
Company has reflected the Common Stock subject to repurchase commitment as
temporary equity, and the $300,000 not paid when due in 1994 as a current
liability. The Company's right to market ALFERON N Injection in the Returned
Territories may be forfeited if the Company does not pay for the shares of
Common Stock which it is obligated to purchase in accordance with the terms of
the 1994 Purdue Amendment.
 
                                      F-11
<PAGE>   66
 
                    INTERFERON SCIENCES, INC. AND SUBSIDIARY
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     Under the amended agreements, the Company also was granted an option (the
"Repurchase Option"), exercisable at a price of $10 million until January 1995
and $12 million until July 1995, to reacquire the right to market and distribute
ALFERON N Injection in the United States and Canada. In the event that the
Company exercises the Repurchase Option, any amounts which have not become due
under the Company Purchase Obligation are cancelled.
 
     In March 1995, the Company entered into an amendment of the 1994 Purdue
Amendments (the "1995 Purdue Amendment") pursuant to which the Company obtained
an option, exercisable until June 20, 1995, (the "Option") to reacquire the
marketing and distribution rights from Purdue Pharma and Mundipharma. The 1995
Amendment provides upon exercise of the Option for (i) the payment of
approximately $3 million in cash (less any amounts paid after March 29, 1995 for
the repurchase of Common Stock under the Company's Purchase Obligation) and (ii)
the issuance of 2.5 million shares of Common Stock. If 18 months from the date
of exercise of the Option by the Company (the "Valuation Date"), the 2.5 million
shares of Common Stock do not have a value of at least $9,037,807 (which value
will be calculated using the average of the closing bid and asked prices of the
Common Stock as quoted by the NASDAQ National Market System for the ten trading
days ending two days prior to the Valuation Date), the Company must issue a note
for the shortfall. Such note will bear interest at the prime rate and will
become due and payable 24 months from the Valuation Date. The Company agreed
that it will utilize its best efforts to ensure that the 2.5 million shares of
Common Stock will be registered and freely tradeable 18 months from the date of
exercise of the Company's option. The Option, if exercised, would replace in its
entirety the royalty obligations and the Repurchase Option described above
contained in the 1994 Amendments with Purdue Pharma and Mundipharma.
 
     Purdue has informed the Company that during the 12-month period ended
December 31, 1994, it sold (including free samples) approximately 27,000 vials
of ALFERON N Injection from its inventory. At December 31, 1994, the Company had
available for sale approximately 14,000 vials of ALFERON N Injection which were
awaiting final release from quality control/assurance.
 
     All of the Company's sales of ALFERON N Injection in 1994 and 1992 were
made to Purdue.
 
NOTE 6.  RESEARCH AND DEVELOPMENT AGREEMENT WITH INTERFERON SCIENCES RESEARCH
PARTNERS, LTD.
 
     During January 1984, the Company organized ISD to act as the sole general
partner of Interferon Sciences Research Partners, Ltd., a New Jersey limited
partnership (the "Partnership"). The Company and the Partnership entered into a
development contract whereby the Company received substantially all of the net
proceeds ($4,414,475) of the Partnership's public offering of limited
partnership interests. The Company used the proceeds to perform research,
development and clinical testing on behalf of the Partnership for the
development of ALFERON Gel containing recombinant interferon (See Note 1).
 
     In connection with the formation of the Partnership, ISD agreed to make
additional cash contributions for purposes of continuing development of ALFERON
Gel if the Partnership exhausted its funds prior to development of such product.
ISD is wholly dependent upon the Company for capital to fund such commitment.
The Partnership exhausted its funds during 1986, and the Company contributed a
total of $1,997,000 during the period from 1986 to 1990, for the continued
development of ALFERON Gel. During May 1987, the Company filed a Product License
Application with the FDA for approval to market ALFERON Gel. At a meeting with
the FDA in February, 1990, the FDA indicated that additional process development
and clinical trials would be necessary prior to approval of ALFERON Gel. The
Company believed, at that time, that the costs to complete the required process
development and clinical trials would be substantial, and there could be no
assurance that the clinical trials would be successful.
 
     As a result of the above events, in March 1992, the Company withdrew its
FDA Product License Application for ALFERON Gel containing recombinant
interferon. In place of single species recombinant interferon, previously
ALFERON Gel's active ingredient, the Company commenced, in 1992, further
 
                                      F-12
<PAGE>   67
 
                    INTERFERON SCIENCES, INC. AND SUBSIDIARY
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
development of ALFERON Gel using the Company's natural source multi-species
alpha interferon ("ALFERON N Gel"). Assuming successful development and
commercial exploitation of ALFERON N Gel, the Company may be obligated to pay
the Partnership royalties equal to 4% of the Company's net sales of ALFERON N
Gel and 15% of revenues received from sublicensing ALFERON N Gel.
 
NOTE 7.  MARKETABLE SECURITIES
 
     As of January 1, 1994, the Company adopted Statement of Financial
Accounting Standards No. 115, "Accounting for Certain Investments in Debt and
Equity Securities" ("SFAS No. 115"). There was no material effect on the
consolidated financial statements as a result of the adoption of this principle.
The Company's marketable securities consist of United States Government
obligations. Under SFAS No. 115, the Company classifies these debt securities as
available-for-sale and records the securities at their fair value. Unrealized
holding gains and losses on available-for-sale securities are excluded from
earnings and are reported as a separate component of stockholders' equity until
realized. The effect of the change in accounting was not material to the Company
and all of the Company's marketable equity securities were sold by December 31,
1994.
 
     A decline in the market value of any available-for-sale security below cost
that is deemed other than temporary is charged to earnings resulting in the
establishment of a new cost basis for the security.
 
     Realized gains and losses for securities classified as available-for-sale
are included in earnings and are derived using the specific identification
method for determining the cost of securities sold.
 
     Proceeds from the sale of investment securities were $6,490,406 for the
year ended December 31, 1994. Net realized losses on such sales for the year
ended December 31, 1994 were $300,430.
 
     The market value and face value of marketable securities at December 31,
1993 was $4,310,000 and $4,300,000, respectively. The Company did not own any
such securities at December 31, 1994.
 
NOTE 8.  INVENTORIES
 
     Inventories, consisting of material, labor and overhead, are classified as
follows:
 
<TABLE>
<CAPTION>
                                                                             DECEMBER 31,
                                                                        -----------------------
                                                                           1994         1993
                                                                        ----------   ----------
<S>                                                                     <C>          <C>
Finished goods........................................................  $  342,330   $1,221,630
Work in process.......................................................     303,111      431,119
Raw materials.........................................................     383,717      506,256
                                                                        ----------   ----------
                                                                        $1,029,158   $2,159,005
                                                                         =========    =========
</TABLE>
 
     Finished goods inventories at December 31, 1994 and 1993, are stated net of
a 1993 write-down of $300,000 to reflect the Company's continuing obligation to
Purdue to replace up to 15,000 vials of ALFERON N Injection at an agreed upon
reduced price.
 
     Finished goods inventory consists of approximately 14,000 vials of ALFERON
N Injection and is scheduled to expire in October 1996.
 
     Consignment inventory consists of ALFERON N Injection shipped to Purdue;
however such shipment is subject to a right of return until notification by
Purdue that the product has been resold. Such inventory is scheduled to expire
in September 1995.
 
     Cost of goods sold and excess/idle production costs for 1994, 1993 and 1992
includes the write-down of December 31, 1994, 1993 and 1992 inventories to their
estimated net realizable value.
 
                                      F-13
<PAGE>   68
 
                    INTERFERON SCIENCES, INC. AND SUBSIDIARY
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
NOTE 9.  LONG TERM DEBT
 
     Long-term debt is comprised of the following:
 
<TABLE>
<CAPTION>
                                                                         DECEMBER 31,
                                                                   ------------------------
                                                                     1994          1993
                                                                   ---------    -----------
    <S>                                                            <C>          <C>
    Note payable in connection with marketing agreement(a).......  $      --    $   458,640
    Note payable for manufacturing facility and equipment(b).....    409,275      1,678,624
                                                                   ---------    -----------
                                                                     409,275      2,137,264
    Less current maturities......................................    409,275      1,999,313
                                                                   ---------    -----------
                                                                   $      --    $   137,951
                                                                    ========      =========
</TABLE>
 
- ---------------
(a) Pursuant to the marketing agreement with Purdue, on December 31, 1991, the
    Company issued a note to Purdue Pharma for $458,640 in advances received
    from Purdue Pharma during 1991. The note accrued interest at 7.5% per annum.
    The payment of both principal and accrued interest for $538,179 was made to
    Purdue on April 25, 1994.
 
(b) On March 13, 1990, the Company borrowed $4.2 million from United States
    Capital Corporation, an indirect subsidiary of The Hong Kong and Shanghai
    Bank, at an effective interest rate of approximately 12.4%. The proceeds of
    the loan were used to finance (i) the expansion of the Company's
    manufacturing facility and (ii) the purchase of additional equipment for the
    facility.
 
     During December 1994, the Company renegotiated the terms of the loan such
that the loan was extended for an additional two months with interest, however,
not all the payments were made by the Company in 1995 and the loan is in
default.
 
     The loan is secured by certain equipment of the Company and is guaranteed
by NPDC.
 
     Aggregate annual maturities of long-term debt outstanding at December 31,
1994 are as follows:
 
<TABLE>
<CAPTION>
  YEAR      AMOUNT
  -----    ---------
  <S>      <C>
  1995..   $ 409,275
</TABLE>
 
NOTE 10.  INCOME TAXES
 
     On May 30, 1991, NPDC exchanged the Company's Class B Common Stock for an
equal number of shares of the Company's Common Stock. As a result, on that date
the Company ceased to be included in NPDC's consolidated Federal income tax
return. For periods subsequent to May 30, 1991, the Company will file its own
consolidated Federal income tax return, including its wholly-owned subsidiary.
The Company's tax net operating loss for the first five months of 1991 was
included in the consolidated Federal income tax return of NPDC.
 
     As a result of the loss allocation rules contained in the Federal income
tax consolidated return regulations, approximately $5,500,000 of net operating
loss carryforwards are available to the Company upon ceasing to be a member of
NPDC's consolidated return group. In addition, the Company has net operating
loss carryforwards from tax years prior to joining the NPDC consolidated return
group of approximately $2,100,000 which expire in 1996-1998. For the seven
months ended December 31, 1991, the Company had a net operating loss of
approximately $3,600,000, which will expire December 31, 2006.
 
     At present, the Company believes that the events culminating with the
closing of the public offering, on October 29, 1991, resulted in an "ownership
change" under Internal Revenue Code Section 382 with respect to its stock. The
Company believes that as a result of the ownership change, the future utility of
its pre-change net operating losses were limited to an annual amount of
approximately $3,700,000. To the extent not used in
 
                                      F-14
<PAGE>   69
 
                    INTERFERON SCIENCES, INC. AND SUBSIDIARY
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
any given year, such limitation carries forward and is cumulative. Due to the
limitation cumulatively being carried forward, the Company believes that
effective December 31, 1994, the annual pre-change net operating loss limitation
of $3,700,000 will no longer be in effect. Therefore, the full pre-change net
operating loss of $11,200,000 is no longer restricted to $3,700,000 annually,
and is fully available to offset future taxable income until the loss
carryforward expires through 2006. In addition, the Company has approximately
$116,000 of investment tax credit carryforwards and $973,000 of research and
development credit carryforwards which expire in 1997-2002. These credits are
also now available to offset any future tax liability, and their use is no
longer restricted by Code Section 382.
 
     The following table summarizes the tax net operating loss carryforwards of
the Company as of December 31, 1994:
 
<TABLE>
<CAPTION>
                                                                                      YEARS
                           DESCRIPTION                               AMOUNT          EXPIRE
- -----------------------------------------------------------------  -----------     -----------
<S>                                                                <C>             <C>
Subject to Section 382:
  Pre-NPDC Group.................................................  $ 2,100,000     1996 - 1998
  NPDC Group Years...............................................    5,500,000     2004 - 2005
  Post-NPDC Group................................................    3,600,000     2006
Not Subject to Section 382:
  Post-NPDC Group................................................   25,700,000     2006 - 2009
                                                                   -----------
                                                                   $36,900,000
                                                                    ==========
</TABLE>
 
     Effective January 1, 1993, the Company adopted Statement of Financial
Accounting Standard No. 109, "Accounting for Income Taxes" ("SFAS No. 109").
This statement requires that deferred income taxes be recorded following the
liability method of accounting and adjusted periodically when income tax rates
change. Adoption of the new Statement did not have any effect on the Company's
financial condition or results of operations since the Company does not carry
any deferred tax accounts on its balance sheet.
 
     A valuation allowance is provided when it is more likely than not that some
portion of the deferred tax asset will not be realized. The Company has
determined, based on the Company's recent history of annual net losses, that a
full valuation allowance is appropriate.
 
     The Company has, as of December 31, 1994, deferred tax assets of
approximately $13,635,000, deferred tax liabilities of approximately $332,000
and a valuation allowance of approximately $13,303,000. At January 1, 1994, the
valuation allowance was $7,742,000. The increase to the valuation allowance is
due primarily to net operating losses. The tax effects that give rise to these
deferred tax assets and liabilities consist of the following as of December 31,
1994:
 
<TABLE>
    <S>                                                                      <C>
    DEFERRED TAX ASSET
    Net operating loss carryforwards.......................................  $ 12,546,000
    Tax credit carryforwards...............................................     1,089,000
                                                                             ------------
                                                                               13,635,000
    DEFERRED TAX LIABILITIES
    Property and equipment, principally due to differences in
      depreciation.........................................................      (332,000)
                                                                             ------------
    Net deferred tax asset.................................................    13,303,000
    Valuation allowance....................................................   (13,303,000)
                                                                             ------------
    Net deferred tax asset after valuation allowance.......................  $          0
                                                                              ===========
</TABLE>
 
                                      F-15
<PAGE>   70
 
                    INTERFERON SCIENCES, INC. AND SUBSIDIARY
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
NOTE 11.  STOCK OPTIONS, WARRANTS AND OTHER SHARES RESERVED
 
     In 1981, the Company adopted the 1981 Stock Option Plan (the "Plan"),
authorizing a committee of the Board of Directors to grant options, over a
10-year period, to purchase not more than 500,000 shares of Common Stock to
officers, directors, employees and consultants of the Company. Since 1981, the
Plan has been amended several times to increase the number of shares issuable
under the Plan to 3,500,000 and to extend the Plan until 2001. Pursuant to the
terms of the Plan, no option may be exercised after 10 years from the date of
grant. The exercise price for any option issued may not be less than 85 percent
of the market price of the Common Stock on the date of issuance.
 
     Options and warrants outstanding and exercisable, and shares reserved for
issuance at December 31, 1991, include warrants to purchase 465,900 shares of
Common Stock pursuant to NPDC's Exchange Offer (see Note 1). Warrants to
purchase 432,600 shares of Common Stock were exercised in February 1992 and the
remaining warrants to purchase 33,300 shares expired unexercised.
 
     Options and warrants outstanding and exercisable, and shares reserved for
issuance at December 31, 1994, 1993 and 1992, include 20,000 shares under a
warrant agreement with U.S. Capital Corporation.
 
     Options and warrants outstanding and exercisable, and shares reserved for
issuance at December 31, 1993 and 1992, include 375,000 shares under warrant
agreements with Purdue. Such warrants were terminated in 1994 as a result of the
amended marketing and distribution agreements with Purdue (see Note 5).
 
     Options and warrants outstanding and shares reserved for issuance at
December 31, 1994, 1993 and 1992, and options and warrants exercisable at
December 31, 1994 and 1993, include 200,000 shares under warrant agreements with
the underwriter of the October 1991 public offering of Common Stock.
 
     Options and warrants outstanding and shares reserved for issuance at
December 31, 1994 and 1993, and options and warrants exercisable at December 31,
1994, include 125,000 shares under a warrant agreement with Strategic Growth
International, the Company's outside public relations advisor.
 
   
     Options and warrants outstanding and exercisable, and shares reserved for
issuance at December 31, 1994 and 1993, include 5,000,000 shares under a warrant
agreement with David Blech. During the first quarter of 1995, Mr. Blech and
certain other parties exchanged an aggregate of 1,200,000 Class A Warrants
(which includes the 462,500 Class A Warrants referred to in Note 1) and
1,200,000 Class B Warrants (which consists of the 1,200,000 Class B Warrants
referred to in Note 1) for an aggregate of 480,000 shares of Common Stock (which
includes the 332,500 shares of Common Stock referred to in Note 1).
    
 
     Options and warrants outstanding and exercisable, and shares reserved for
issuance at December 31, 1994 include 61,000 shares under a warrant agreement
issued as a commission in connection with the sale of shares of Common Stock to
an institutional investor.
 
                                      F-16
<PAGE>   71
 
                    INTERFERON SCIENCES, INC. AND SUBSIDIARY
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     Changes in options and warrants outstanding during the years ended December
31, 1994, 1993 and 1992, options and warrants exercisable and shares reserved
for issuance at December 31, 1994, 1993 and 1992 are as follows:
 
<TABLE>
<CAPTION>
                                                                  PRICE RANGE      NUMBER OF
                                                                   PER SHARE         SHARES
                                                                  ------------     ----------
<S>                                                              <C>               <C>
Options and Warrants
Outstanding at December 31, 1991................................ $2.25 -- $ 9.00    3,355,450
Granted.........................................................  3.50 --  10.00      736,500
Exercised.......................................................  2.25 --   6.88     (479,900)
Terminated......................................................  2.25 --   6.88     (109,500)
                                                                  ------------     ----------
Outstanding at December 31, 1992................................  2.25 --  10.00    3,502,550
Granted.........................................................  2.13 --   5.00    5,138,250
Exercised.......................................................  2.25 --   4.25      (12,200)
Terminated......................................................  3.50 --   9.00      (28,750)
                                                                  ------------     ----------
Outstanding at December 31, 1993................................  2.13 --  10.00    8,599,850
Granted.........................................................  2.00 --   2.70    2,318,700
Exercised.......................................................                           --
Terminated......................................................  3.13 --  10.00   (2,638,200)
                                                                  ------------     ----------
Outstanding at December 31, 1994................................  2.00 --   6.50    8,280,350
                                                                                    =========
Exercisable
December 31, 1992...............................................  2.25 --  10.00    2,131,350
                                                                                    =========
December 31, 1993...............................................  2.13 --  10.00    7,738,950
                                                                                    =========
December 31, 1994...............................................  2.00 --   6.50    7,841,200
                                                                                    =========
Shares reserved for issuance
December 31, 1992...............................................                    3,772,520
                                                                                    =========
December 31, 1993...............................................                    8,885,320
                                                                                    =========
December 31, 1994...............................................                    8,571,320
                                                                                    =========
</TABLE>
 
NOTE 12.  PENSION AND INVESTMENT PLANS
 
     NPDC had a Defined Benefit Pension Plan (the "Plan") for employees of
certain divisions and subsidiaries including those of the Company. Benefits were
based primarily on years of service and a fixed rate of benefits per year of
service. Contributions were intended to provide not only for benefits attributed
to service to date but also for those expected to be earned in the future.
 
     Effective December 31, 1991, the Plan benefits were frozen. In the future,
accrued vested benefits will be paid to terminated participants in the form of a
lump sum distribution in cases where the accrued vested benefit is less than
$3,500. Terminated participants can elect a lump sum distribution if the accrued
vested benefit is greater than $3,500 but less than $7,500.
 
     In the event that the accrued vested benefit exceeds the $7,500 payable
limit as outlined in the Plan, payment will be deferred until a terminated
vested participant reaches age 65 or elects early retirement, at age 60 or
later. As of December 31, 1994, 1993 and 1992, the projected benefit obligation
of the NPDC Plan was $4,469,000, $4,917,000 and $3,976,000 and the fair value of
plan assets was $3,405,000, $3,528,000 and
 
                                      F-17
<PAGE>   72
 
                    INTERFERON SCIENCES, INC. AND SUBSIDIARY
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
$3,120,000. The discount rate used in determining the actuarial present value of
the projected benefit obligation was 8.25%. The expected long-term rate of
return on assets was 10 percent.
 
     Effective March 1, 1992, NPDC adopted the 1992 401(k) Savings Plan (the
"Savings Plan"). Effective December 31, 1991, the Plan participants would no
longer accrue benefits under the Defined Benefit Pension Plan, but became
eligible to participate in NPDC's Savings Plan.
 
     NPDC's Savings Plan is for employees who have completed one year of
service; however, past vesting service credit was recognized for employees who
participated in the Savings Plan at the date of initial enrollment, March 1,
1992.
 
     The Savings Plan permits pre-tax contributions to the Savings Plan by
participants pursuant to Section 401(k) of the Internal Revenue Code of 2% to 6%
of base compensation. The Company matches 40% of the participants' eligible
contributions based on a formula set forth in the Savings Plan. For 1994 and
1993, the Company's contribution to the Savings Plan was $53,000 and $49,000,
respectively. Participants are fully vested in their contributions and may
withdraw such contributions at time of employment termination, or at age 59 1/2,
or earlier in the event of financial hardship. Amounts otherwise are paid at
retirement or in the event of death or disability. Employer contributions vest
at a rate of 20% per year.
 
     The Savings Plan is administered by a trustee appointed by the Board of
Directors of NPDC and all contributions are held by the trustee and invested at
the participants' direction in various mutual funds.
 
     The Company does not provide any post-retirement benefits, other than
pensions, to its employees.
 
NOTE 13.  PROFIT SHARING PLAN
 
     Effective June 6, 1988, the Company adopted the 1988 Profit Sharing Plan
(the "Profit Sharing Plan") providing key employees and consultants with an
opportunity to share in the profits of the Company. The Profit Sharing Plan is
administered by the Company's Compensation Committee.
 
     Pursuant to the terms of the Profit Sharing Plan, the Compensation
Committee, in its sole discretion, based upon the significance of the employee's
contributions to the operations of the Company, selects certain key employees
and consultants of the Company who are entitled to participate in the Profit
Sharing Plan and determines the extent of their participation. The amount of the
Company's profits available for distribution to the participants (the
"Distribution Pool") is the lesser of (a) 10% of the Company's income before
taxes and profit sharing expense and (b) an amount equal to 100% of the base
salary for such year of all the participants in the Profit Sharing Plan. A
number of key employees are eligible to participate in the Profit Sharing Plan.
 
     The Compensation Committee may require as a condition to participation that
a participant remain in the employ of the Company until the end of the fiscal
year for which payment is to be made. Payments required to be made under the
Profit Sharing Plan must be made within 10 days of the filing of the Company's
tax return. To date, there have been no contributions by the Company under the
Profit Sharing Plan.
 
NOTE 14.  NON-CASH FINANCING AND INVESTING ACTIVITIES
 
     During the years ended December 31, 1994, 1993 and 1992 the following
noncash financing and investing activities occurred:
 
1994:
 
     The Company committed to purchase 932,494 shares, valued at $3,729,976, of
the Common Stock from Purdue.
 
     Offset of receivables of $700,000 in settlement of obligation to repurchase
Common Stock.
 
                                      F-18
<PAGE>   73
 
                    INTERFERON SCIENCES, INC. AND SUBSIDIARY
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
1993:
 
     The Company issued 40,967 shares, valued at $143,385, of Common Stock as
required by various agreements.
 
1992:
 
     None occurred.
 
NOTE 15.  COMMITMENTS AND CONTINGENCIES
 
     As consideration for the transfer to the Company of certain licenses,
rights and assets upon the formation of the Company by NPDC, the Company agreed
to pay NPDC royalties of $1,000,000, but such payments will be made only with
respect to those years in which the Company has income before income taxes, and
will be limited to 25% of such income.
 
     See Notes 4 and 6 for information relating to royalties payable to Roche
and the Partnership, respectively.
 
     In October 1989, the Company entered into a license agreement with a
non-affiliated party for co-exclusive rights to certain low dose oral
formulations of interferon. The Company will be required to pay a royalty of 10%
of net sales, as defined, of products produced and marketed by the Company that
may be developed under the license agreement.
 
NOTE 16.  SUBSEQUENT EVENT
 
   
     In the first quarter of 1995, the Company concluded an agreement with
Fujimoto Diagnostics, Inc. (Fujimoto) of Osaka, Japan, for the commercialization
of the Company's alpha interferon in Japan. In connection with the agreement,
Fujimoto purchased 1,034,483 shares of the Company's Common Stock for $1,500,000
and committed to purchase an additional $500,000 of Common Stock in February,
1996. The agreement grants Fujimoto exclusive rights to develop, distribute and
sell the Company's injectable and topical formulations of Interferon Alfa-n3 in
Japan. Under the agreement, Fujimoto will fund and conduct all preclinical and
clinical studies required for regulatory approval in Japan. Fujimoto will
purchase quantities of the Company's natural alpha interferon at agreed-upon
prices during the preclinical and clinical phases and upon commercialization.
    
 
                                      F-19
<PAGE>   74
 
                    INTERFERON SCIENCES, INC. AND SUBSIDIARY
 
                     CONSOLIDATED CONDENSED BALANCE SHEETS
 
<TABLE>
<CAPTION>
                                                                   MARCH 31,       DECEMBER 31,
                                                                      1995            1994*
                                                                  ------------     ------------
                                                                  (UNAUDITED)
<S>                                                               <C>              <C>
ASSETS
CURRENT ASSETS
  Cash and cash equivalents.....................................  $    105,248     $    330,617
  Accounts and other receivables................................       140,064           35,546
  Inventories...................................................     1,151,590        1,029,158
  Consignment inventory.........................................                        220,410
  Receivables from affiliated companies, net....................        20,001           20,001
  Prepaid expenses and other current assets.....................        68,586           55,221
                                                                  ------------     ------------
TOTAL CURRENT ASSETS............................................     1,485,489        1,690,953
                                                                  ------------     ------------
PROPERTY, PLANT AND EQUIPMENT, AT COST..........................    11,826,069       11,826,069
  Less accumulated depreciation and amortization................    (6,199,111)      (6,013,839)
                                                                  ------------     ------------
                                                                     5,626,958        5,812,230
                                                                  ------------     ------------
INTANGIBLE ASSETS, NET OF AMORTIZATION..........................       349,624          355,019
OTHER ASSETS....................................................       323,900          323,900
                                                                  ------------     ------------
TOTAL ASSETS....................................................  $  7,785,971     $  8,182,102
                                                                   ===========      ===========
 
LIABILITIES AND STOCKHOLDERS' EQUITY
CURRENT LIABILITIES
  Current maturities of long-term debt..........................  $    274,370     $    409,275
  Accounts payable and accrued expenses.........................     1,641,469        1,629,025
  Amount due NPDC...............................................       244,113          134,347
  Amount due Purdue for repurchase of common stock..............       232,217          300,000
                                                                  ------------     ------------
TOTAL CURRENT LIABILITIES.......................................     2,392,169        2,472,647
                                                                  ------------     ------------
COMMON STOCK SUBJECT TO REPURCHASE COMMITMENT (682,494
  SHARES).......................................................     2,729,976        2,729,976
                                                                  ------------     ------------
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY
  Preferred stock, par value $.01 per share;
     authorized -- 5,000,000 shares; none issued and
     outstanding................................................
  Common stock, par value $.01 per share;
     authorized -- 40,000,000 shares; issued and
     outstanding -- 21,023,774 and
     19,509,291 shares..........................................       210,238          195,093
Capital in excess of par value..................................    67,039,598       65,572,243
Accumulated deficit.............................................   (64,586,010)     (62,787,857)
                                                                  ------------     ------------
TOTAL STOCKHOLDERS' EQUITY......................................     2,663,826        2,979,479
                                                                  ------------     ------------
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY......................  $  7,785,971     $  8,182,102
                                                                   ===========      ===========
</TABLE>
 
- ---------------
* The condensed balance sheet as of December 31, 1994 has been summarized from
  the Company's audited balance sheet as of that date.
 
  The accompanying notes are an integral part of these consolidated condensed
                             financial statements.
 
                                      F-20
<PAGE>   75
 
                    INTERFERON SCIENCES, INC. AND SUBSIDIARY
 
                CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                        THREE MONTHS ENDED
                                                                             MARCH 31,
                                                                    ---------------------------
                                                                       1995            1994
                                                                    -----------     -----------
<S>                                                                 <C>             <C>
REVENUES
Sales
  Alferon N Injection.............................................  $   174,710     $
  Research products and other revenues............................        4,909           1,316
                                                                    -----------     -----------
          Total revenues..........................................      179,619           1,316
                                                                    -----------     -----------
 
COSTS AND EXPENSES
  Cost of goods sold and excess/idle production costs.............      568,095         462,786
  Research and development (net of $45,498 and $37,500 of rental
     income received from NPDC)...................................      960,152       1,169,300
  General and administrative (includes $304,654 and $471,664 of
     charges from NPDC for management fees and reimbursements of
     expenses)....................................................      446,392         739,943
                                                                    -----------     -----------
          Total costs and expenses................................    1,974,639       2,372,029
                                                                    -----------     -----------
LOSS FROM OPERATIONS..............................................   (1,795,020)     (2,370,713)
  Interest and other income.......................................        6,776          90,224
  Interest expense................................................       (9,909)        (65,305)
                                                                    -----------     -----------
NET LOSS..........................................................  $(1,798,153)    $(2,345,794)
                                                                     ==========      ==========
NET LOSS PER SHARE................................................  $      (.08)    $      (.12)
                                                                     ==========      ==========
Weighted average number of shares outstanding.....................   21,199,027      19,417,410
                                                                     ==========      ==========
</TABLE>
 
  The accompanying notes are an integral part of these consolidated condensed
                             financial statements.
 
                                      F-21
<PAGE>   76
 
                    INTERFERON SCIENCES, INC. AND SUBSIDIARY
 
                 CONSOLIDATED CONDENSED STATEMENT OF CHANGES IN
                              STOCKHOLDERS' EQUITY
                       THREE MONTHS ENDED MARCH 31, 1995
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                          COMMON STOCK       CAPITAL IN                      TOTAL
                                     ----------------------   EXCESS OF    ACCUMULATED    STOCKHOLDERS'
                                       SHARES      AMOUNT     PAR VALUE      DEFICIT         EQUITY
                                     -----------  ---------  -----------   ------------   ------------
<S>                                  <C>          <C>        <C>           <C>            <C>
BALANCE AT DECEMBER 31, 1994......    19,509,291  $ 195,093  $65,572,243   $(62,787,857)  $  2,979,479
Net proceeds from the sale of
  common stock to Fujimoto
  Diagnostics, Inc................     1,034,483     10,345    1,472,155                     1,482,500
Issuance of common stock in
  exchange for warrants to
  purchase common stock...........       480,000      4,800       (4,800)
Net loss..........................                                           (1,798,153)    (1,798,153)
                                     -----------  ---------  -----------   ------------   ------------
BALANCE AT MARCH 31, 1995.........    21,023,774  $ 210,238  $67,039,598   $(64,586,010)  $  2,663,826
                                       =========   ========   ==========    ===========     ==========
</TABLE>
 
  The accompanying notes are an integral part of these consolidated condensed
                             financial statements.
 
                                      F-22
<PAGE>   77
 
                    INTERFERON SCIENCES, INC. AND SUBSIDIARY
 
                CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                        THREE MONTHS ENDED
                                                                             MARCH 31,
                                                                    ---------------------------
                                                                       1995            1994
                                                                    -----------     -----------
<S>                                                                 <C>             <C>
CASH FLOWS USED FOR OPERATIONS:
  Net loss........................................................  $(1,798,153)    $(2,345,794)
  Adjustments to reconcile net loss to net cash used for operating
     activities:
     Depreciation and amortization................................      194,015         201,023
     Net gain on sales of marketable securities...................                       (9,102)
     Change in operating assets and liabilities:
       Inventories................................................     (122,432)        158,440
       Consignment inventory......................................      220,410
       Receivables from affiliated companies......................                      (93,913)
       Accounts and other receivables.............................     (172,301)         30,226
       Prepaid expenses and other current assets..................      (13,365)       (158,161)
       Accounts payable and accrued expenses......................       12,444          (3,855)
                                                                    -----------     -----------
          Net cash used for operations............................   (1,679,382)     (2,221,136)
                                                                    -----------     -----------
 
CASH FLOWS FROM INVESTING ACTIVITIES:
  Purchases of marketable securities..............................                   (2,496,445)
  Sales of marketable securities..................................                    2,006,797
  Additions to property, plant and equipment......................                      (54,805)
  Additions to intangible and other assets........................       (3,348)        (13,329)
                                                                    -----------     -----------
          Net cash used for investing activities..................       (3,348)       (557,782)
                                                                    -----------     -----------
 
CASH FLOWS FROM FINANCING ACTIVITIES:
  Net proceeds from sale of common stock..........................    1,482,500
  Increase (decrease) in advances from NPDC.......................      109,766          (8,050)
  Reduction of long-term debt.....................................     (134,905)       (366,037)
  Purchase of common stock from Runham and Banela.................                     (250,000)
                                                                    -----------     -----------
          Net cash provided by (used for) financing activities....    1,457,361        (624,087)
                                                                    -----------     -----------
Net decrease in cash and cash equivalents.........................     (225,369)     (3,403,005)
 
Cash and cash equivalents at beginning of period..................      330,617       4,247,067
                                                                    -----------     -----------
 
Cash and cash equivalents at end of period........................  $   105,248     $   844,062
                                                                     ==========      ==========
 
Cash paid for interest expense....................................  $     8,564     $    52,463
                                                                     ==========      ==========
NONCASH INVESTING AND FINANCING ACTIVITIES:
  Offset of receivables in settlement of obligation to repurchase
     stock........................................................  $    67,783     $
                                                                     ==========      ==========
  Reductions in marketable securities.............................  $               $   152,666
                                                                     ==========      ==========
  Commitment to purchase common stock.............................  $               $ 3,729,976
                                                                     ==========      ==========
</TABLE>
 
  The accompanying notes are an integral part of these consolidated condensed
                             financial statements.
 
                                      F-23
<PAGE>   78
 
                    INTERFERON SCIENCES, INC. AND SUBSIDIARY
 
              NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
                                  (UNAUDITED)
 
NOTE 1.  AMENDED AGREEMENTS WITH THE PURDUE FREDERICK COMPANY
 
     On January 27, 1994, the Company reacquired marketing and distribution
rights for ALFERON N Injection from Mundipharma Pharmaceutical Company
("Mundipharma"), an affiliate of The Purdue Frederick Company (together with its
affiliates, "Purdue"), in Western Europe, Israel, India and Australia.
Mundipharma and its affiliate, Purdue Pharma L.P. ("Purdue Pharma"), retained
exclusive marketing and distribution rights for Canada and the United States,
respectively, subject to the Company's option to reacquire the United States and
Canadian marketing and distribution rights at a price of $12 million until July
26, 1995 (the "Repurchase Option"). Purdue gave the Company a new purchase order
for 45,000 vials of ALFERON N Injection at an agreed upon price. In addition,
the Company will pay Mundipharma a 3% royalty on net sales in the reacquired
territories. This rate will be reduced to 1% after certain aggregate royalty
payments have been made. The Company was also obligated to provide Purdue with
up to 15,000 vials of ALFERON N Injection, at an agreed upon price, to replace
any inventory of Purdue existing on the date of the amendment which goes out of
date. The Company also granted Purdue an option, exercisable until July, 1995,
to purchase an additional 100,000 vials of ALFERON N Injection at an agreed upon
price.
 
     Under the amended agreements (the "1994 Purdue Amendments"), the Company
assumed responsibility for the conduct and funding of clinical trials to develop
new indications of ALFERON N Injection. Upon the Company obtaining approval in
the United States for additional indications of ALFERON N Injection, Purdue
Pharma and Mundipharma were obligated, in order to maintain their exclusive
license, to repay certain of the Company's research and development costs and
make certain additional payments to the Company for the rights for the first
five of any such new uses.
 
     The Company also agreed to buy back 994,994 shares of Common Stock then
held by Purdue at an agreed upon price of $4.00 per share (the "Company Purchase
Obligation") over an 18-month period. In January 1994, the Company purchased
62,500 of such shares for $250,000 and such shares were cancelled by the
Company. The Company was obligated to pay an additional $1,000,000 to purchase
250,000 shares during 1994. In 1994, the Company and Purdue agreed to offset
$700,000 owed to the Company by Purdue, for the purchase of ALFERON N Injection
during 1994, against the Company's obligation to purchase $1,000,000 of Common
Stock from Purdue in 1994. The Company has reflected the Common Stock subject to
repurchase commitment as temporary equity, and $300,000 of this obligation to
Purdue that was not paid in 1994 as a current liability on the balance sheet at
December 31, 1994. In addition, as of March 31, 1995 the Company had applied an
additional $67,783 of offsets based upon additional sales of ALFERON N Injection
by Purdue. In April 1995, the Company was required to purchase 62,500 shares of
Common Stock for $250,000 and in July 1995 is obligated to purchase 619,994
shares of Common Stock for $2,479,976. As of May 4, 1995, the Company had
generated sufficient additional offsets based upon additional sales of ALFERON N
Injection to and by Purdue to repay the $232,217 owed to Purdue as of March 31,
1995 and to pay $140,000 of the $250,000 owed to Purdue for the April 1995 stock
repurchase. The Company anticipates that the $110,000 unpaid balance of the
purchase price for the 62,500 shares required to be repurchased in April 1995
will be paid through additional offsets or working capital or both. The Company
currently anticipates repurchasing certain marketing rights from Purdue.
 
     In March 1995, the Company entered into an amendment of the 1994 Purdue
Amendments (the "1995 Purdue Amendment") pursuant to which the Company obtained
an option, exercisable until June 30, 1995, (the "Option") to reacquire the
remaining marketing and distribution rights from Purdue Pharma and Mundipharma.
The exercise price of the Option is (i) $2,962,193 in cash (less any amounts
paid after March 29, 1995 for the repurchase of Common Stock described above)
and (ii) 2.5 million shares of Common Stock. As of May 4, 1995, an aggregate of
$372,217 had been so paid after March 29, 1995, and an additional $110,000 will
be so paid prior to any exercise of the Option, reducing the cash component of
the option exercise price to $2,479,976. If 18 months from the date of exercise
of the Option by the Company (the
 
                                      F-24
<PAGE>   79
 
                    INTERFERON SCIENCES, INC. AND SUBSIDIARY
 
      NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS -- (CONTINUED)
                                  (UNAUDITED)
 
"Valuation Date"), the 2.5 million shares of Common Stock do not have a value of
at least $9,037,807 (which value will be calculated using the average of the
closing bid and asked prices of the Common Stock as quoted by the NASDAQ
National Market System for the ten trading days ending two days prior to the
Valuation Date), the Company must issue a note for the shortfall. Such note will
bear interest at the prime rate, and will become due and payable 24 months from
the Valuation Date. The Company agreed that it will utilize its best efforts to
ensure that the 2.5 million shares of Common Stock will be registered and freely
tradeable 18 months from the date of exercise of the Company's option. If the
Option is exercised, the Repurchase Option, the royalty obligations, and
Purdue's right to obtain marketing and distribution rights for new indications
contained in the 1994 Purdue Amendment will terminate and the cash component of
the Option exercise price will be deemed to constitute payment for the remainder
of the shares of Common Stock subject to the repurchase obligation, and the
Company will receive such shares for no additional consideration.
 
NOTE 2.  AGREEMENT WITH FUJIMOTO DIAGNOSTICS, INC.
 
   
     In the first quarter of 1995, the Company concluded an agreement with
Fujimoto Diagnostics, Inc. (Fujimoto) of Osaka, Japan, for the commercialization
of the Company's ALFERON N Injection and ALFERON N Gel in Japan. In connection
with the agreement, Fujimoto purchased 1,034,483 shares of the Company's Common
Stock for $1,500,000 ($1.45 per share, the then current market price) and
committed to purchase an additional $500,000 of Common Stock in February 1996
based on the then current market price. The agreement grants Fujimoto exclusive
rights to develop, distribute and sell ALFERON N Injection and ALFERON N Gel in
Japan. Under the agreement, Fujimoto agreed to fund and conduct all preclinical
and clinical studies required for regulatory approval in Japan. Fujimoto will
purchase quantities of ALFERON N Injection and ALFERON N Gel at agreed-upon
prices during the preclinical and clinical phases.
    
 
NOTE 3.  INVENTORIES
 
     Inventories, consisting of material, labor and overhead, are classified as
follows:
 
<TABLE>
<CAPTION>
                                                               MARCH 31,        DECEMBER 31,
                                                                  1995              1994
                                                               ----------       ------------
    <S>                                                        <C>              <C>
    Finished goods...........................................  $  387,330        $  342,330
    Work in process..........................................     389,118           303,111
    Raw materials............................................     375,142           383,717
                                                               ----------       ------------
                                                               $1,151,590        $1,029,158
                                                                =========        ==========
</TABLE>
 
     Finished goods inventories at March 31, 1995 and December 31, 1994, are
stated net of a 1993 write-down of $300,000 to reflect the Company's continuing
obligation to Purdue to replace up to 15,000 vials of ALFERON N Injection at an
agreed upon reduced price.
 
     Finished goods inventory consists of approximately 15,000 vials of ALFERON
N Injection and is scheduled to expire in October 1996.
 
   
NOTE 4.  SUBSEQUENT EVENT
    
 
   
     Subsequent to March 31, 1995, 1,050,000 Class A Warrants and 1,050,000
Class B Warrants were exchanged for an aggregate of 420,000 shares of Common
Stock.
    
 
                                      F-25
<PAGE>   80
 
                    INTERFERON SCIENCES, INC. AND SUBSIDIARY
 
                QUALIFICATION RELATING TO FINANCIAL INFORMATION
                                 MARCH 31, 1995
 
     The financial information included herein is unaudited. Such information,
however, reflects all adjustments (consisting solely of normal recurring
adjustments) which are, in the opinion of management, necessary to a fair
statement of the results for the interim periods. The results for interim
periods are not necessarily indicative of results to be expected for the year.
 
                                      F-26
<PAGE>   81
 
- ------------------------------------------------------
- ------------------------------------------------------
 
  NO DEALER, SALESPERSON, OR ANY OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS
PROSPECTUS, AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT
BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY OR THE UNDERWRITER. THIS
PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR THE SOLICITATION OF ANY OFFER
TO BUY ANY OF THE SECURITIES OFFERED HEREBY TO ANYONE IN ANY JURISDICTION IN
WHICH SUCH OFFER OR SOLICITATION IS UNLAWFUL. NEITHER THE DELIVERY OF THIS
PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, IMPLY
THAT THERE HAS BEEN NO CHANGE IN THE AFFAIRS OF THE COMPANY OR THAT THE
INFORMATION HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO THE DATES AS OF WHICH
SUCH INFORMATION IS GIVEN.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                        PAGE
                                        ----
<S>                                     <C>
Prospectus Summary..................       3
The Company.........................       8
Risk Factors........................       8
Use of Proceeds.....................      17
Price Range of Common Stock and
  Dividend Policy...................      17
Capitalization......................      18
Dilution............................      19
Selected Financial Information......      20
Management's Discussion and Analysis
  of Financial Condition and Results
  of Operations.....................      21
Business............................      26
Management..........................      42
Principal Stockholders..............      44
Certain Transactions................      46
Underwriting........................      48
Description of Securities...........      50
Legal Matters.......................      50
Experts.............................      51
Additional Information..............      51
Index to Consolidated Financial
  Statements........................     F-1
</TABLE>
 
- ------------------------------------------------------
- ------------------------------------------------------
 
- ------------------------------------------------------
- ------------------------------------------------------
INTERFERON SCIENCES, INC.
   
                               12,000,000 SHARES
    
 
                                       OF
 
                                  COMMON STOCK
                               ------------------
                                   PROSPECTUS
                               ------------------
                                  SUNRISE LOGO
                                          , 1995
- ------------------------------------------------------
- ------------------------------------------------------
<PAGE>   82
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
     The following table sets forth an itemized statement of all estimated
expenses in connection with the issuance and distribution of the securities
being registered hereby other than the SEC and NASD fees.
 
   
<TABLE>
    <S>                                                                         <C>
    SEC registration fee......................................................  $  5,524
    NASD fee..................................................................     2,180
    NASDAQ listing fee........................................................    17,500
    Accounting fees and expenses..............................................    35,000
    Legal fees and expenses...................................................   110,000
    Blue sky expenses and counsel fees........................................    35,000
    Cost of printing and engraving............................................   150,000
    Transfer agent's fees.....................................................     1,000
    Miscellaneous.............................................................    43,796
                                                                                --------
              Total...........................................................  $400,000
                                                                                ========
</TABLE>
    
 
ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
     The Company's By-laws provide that the Company shall, to the full extent
permitted by Section 145 of the General Corporation Law of the State of
Delaware, as amended from time to time, indemnify all persons whom it may
indemnify pursuant thereto. In addition, Article 4, Section 10 of the Company's
Restated Certificate of Incorporation eliminates personal liability of its
directors to the full extent permitted by Section 102(b)(7) of the General
Corporation Law of the State of Delaware, as amended from time to time.
 
     Section 145 of the General Corporation Law of the State of Delaware permits
a corporation to indemnify its directors and officers against expenses
(including attorney's fees), judgments, fines and amounts paid in settlements
actually and reasonably incurred by them in connection with any action, suit or
proceeding brought by third parties, if such directors or officers acted in good
faith and in a manner they reasonably believed to be in or not opposed to the
best interests of the corporation and, with respect to any criminal action or
proceeding, had no reason to believe their conduct was unlawful. In a derivative
action, i.e., one by or in the right of the corporation, indemnification may be
made only for expenses actually and reasonably incurred by directors and
officers in connection with the defense or settlement of an action or suit, and
only with respect to a matter as to which they shall have acted in good faith
and in a manner they reasonably believed to be in or not opposed to the best
interest of the corporation, except that no indemnification shall be made if
such person shall have been adjudged liable to the corporation, unless and only
to the extent that the court in which the action or suit was brought shall
determine upon application that the defendant officers or directors are
reasonably entitled to indemnity for such expenses despite such adjudication of
liability.
 
     Section 102(b)(7) of the General Corporation Law of the State of Delaware
provides that a corporation may eliminate or limit the personal liability of a
director to the corporation or its stockholders for monetary damages for breach
of fiduciary duty as a director, provided that such provision shall not
eliminate or limit the liability of a director (i) for any breach of the
director's duty of loyalty to the corporation or its stockholders, (ii) for acts
or omissions not in good faith or which involve intentional misconduct or a
knowing violation of law, (iii) under Section 174 of the General Corporation Law
of the State of Delaware, or (iv) for any transaction from which the director
derived an improper personal benefit. No such provision shall eliminate or limit
the liability of a director for any act or omission occurring prior to the date
when such provision becomes effective.
 
   
     Section 8 of the Underwriting Agreement (filed as Exhibit 1.1) provides
that the Underwriter will indemnify and hold harmless the Company and each
director, officer, or controlling person of the Company from and against any
liability caused by any statement or omission in the Registration Statement or
    
 
                                      II-1
<PAGE>   83
 
Prospectus based upon information furnished in writing to the Company by the
Underwriter expressly for use therein.
 
     The Company currently has a $1,000,000 directors' and officers' liability
insurance policy.
 
ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.
 
   
<TABLE>
<S>    <C>  <C>
   (a)   -- Exhibits
   1.1   -- Form of Underwriting Agreement between the Registrant and Sunrise Securities Corp.*
   1.2   -- Form of Subscription Agreement*
   1.3   -- Form of Escrow Agreement*
   1.4   -- Form of Master Selected Dealer Agreement*
   3.1   -- Restated Certificate of Incorporation of the Registrant. Incorporated herein by
            reference to Exhibit 3B of the Registrant's Annual Report on Form 10-K for the year
            ended December 31, 1988.
   3.2   -- Certificate of Amendment of Restated Certificate of Incorporation of the
            Registrant. Incorporated herein by reference to Exhibit 3.4 of Registration
            Statement No. 33-40902.
   3.3   -- Certificate of Amendment to the Restated Certificate of Incorporation of the
            Registrant. Incorporated herein by reference to Exhibit 3.2 of Registration
            Statement No. 33-78952.
   3.4   -- By-Laws of the Registrant, as amended. Incorporated herein by reference to Exhibit
            3.2 of Registration Statement No. 2-7117.
   4.1   -- Form of Underwriter's Purchase Options.*
   4.2   -- Underwriter's Warrant dated October 29, 1991 between the Registrant and
            Commonwealth Associates. Incorporated herein by reference to Exhibit 4.2 of
            Registration Statement No. 33-40902.
   4.3   -- Agam Warrant dated October 29, 1991 between the Registrant and Jacob Agam.
            Incorporated herein by reference to Exhibit 4.3 of the Registrant's Annual Report
            on Form 10-K for the year ended December 31, 1991.
   5.1   -- Opinion of Lawrence M. Gordon, Esq., General Counsel, Registrant, as to the
            legality of the securities being registered.****
  10.1   -- Transfer and License Agreement among National Patent, Hydron Laboratories, Inc. and
            the Registrant dated as of January 1, 1981. Incorporated herein by reference to
            Exhibit 10.8 of the Registrant's Registration Statement No. 2-71117.
  10.2   -- Management Services Agreement dated January 1, 1981 between the Registrant and
            National Patent. Incorporated herein by reference to Exhibit 10.9 of the
            Registration Statement No. 2-71117.
  10.3   -- Registrant's 1981 Stock Option Plan, as amended.****
  10.4   -- Cross License Agreement dated October 26, 1984 between the Registrant and the
            Partnership. Incorporated herein by reference to Exhibit 10V of the Registrant's
            Annual Report on Form 10-K for the year ended December 31, 1984.
  10.5   -- Deleted
  10.6   -- Deleted
  10.7   -- Deleted
  10.8   -- Deleted
  10.9   -- Supply Agreement dated September 25, 1992 between the Registrant and Celltech
            Limited. Incorporated herein by reference to Exhibit 10.27 of the Registrant's
            Annual Report on Form 10-K for the year ended December 31, 1992.
 10.10   -- Deleted
 10.11   -- Profit Sharing Plan of the Registrant. Incorporated herein by reference to Exhibit
            10X of the Registrant's Annual Report on Form 10-K for the year ended December 31,
            1988.
 10.12   -- License Agreement dated October 20, 1989 between the Registrant and Amarillo Cell
            Culture Company, Incorporated. Incorporated herein by reference to Exhibit 10Y of
            the Registrant's Annual Report on Form 10K for the year ended December 31, 1989.(1)
 10.13   -- Deleted
 10.14   -- Deleted
</TABLE>
    
 
                                      II-2
<PAGE>   84
 
   
<TABLE>
<C>    <C>  <S>
 10.15   -- Distribution Agreement dated June 14, 1991 between Purdue Pharma L.P. and the
            Registrant. Incorporated herein by reference to Exhibit 10.26 of Registration
            Statement No. 33-40902.
 10.16   -- Amended and Restated Distribution Agreement dated June 14, 1991 between Mundipharma
            Pharmaceutical Corporation and the Registrant. Incorporated herein by reference to
            Exhibit 10.27 of Registration Statement No. 33-40902.
 10.17   -- Deleted
 10.18   -- NPDC 401(k) Savings Plan dated January 9, 1992, effective March 1, 1992.
            Incorporated herein by reference to Exhibit 10.12 to the Registrant's Annual Report
            on Form 10-K for the Year ended December 31, 1992.
 10.19   -- Amendment dated January 26, 1994 to the Distribution Agreement dated June 14, 1991
            between the Registrant and Purdue Pharma L.P. Incorporated herein by reference to
            Exhibit 10.18 to the Registrant's Annual Report on Form 10-K for the Year ended
            December 31, 1993.
 10.20   -- Amendment dated January 26, 1994 to the Amended and Restated Distribution Agreement
            dated June 14, 1991 between the Registrant and Mundipharma Pharmaceutical Company.
            Incorporated herein by reference to Exhibit 10.19 to the Registrant's Annual Report
            on Form 10-K for the Year ended December 31, 1993.
 10.21   -- Amended and Restated RS Agreement dated January 26, 1994 among the Registrant,
            Mundipharma Pharmaceutical Company and Purdue Pharma L.P. Incorporated herein by
            reference to Exhibit 10.20 to the Registrant's Annual Report on Form 10-K for the
            Year ended December 31, 1993.
 10.22   -- Agreement dated January 26, 1994 between the Registrant and The Purdue Frederick
            Company. Incorporated herein by reference to Exhibit 10.21 to the Registrant's
            Annual Report on Form 10-K for the Year ended December 31, 1993.
 10.23   -- Agreement dated January 26, 1994 among the Registrant, Banela Corporation and
            Runham Corporation. Incorporated herein by reference to Exhibit 10.22 to the
            Registrant's Annual Report on Form 10-K for the Year ended December 31, 1993.
 10.24   -- Deleted
 10.25   -- Purchase Agreement dated as of May 28, 1993 between the Registrant and David Blech.
            Incorporated herein by reference to Exhibit 10.26 of Registration Statement No.
            33-78952.
 10.26   -- Form of Warrant to be issued pursuant to the Purchase Agreement. Incorporated
            herein by reference to Exhibit 10.28 of Registration Statement No. 33-78952.
 10.27   -- Distribution Agreement dated as of February 3, 1994 between Registrant and
            Industria Farmaceutica Andromaco, S.A. Incorporated herein by reference to Exhibit
            6(a) to the Registrant's Quarterly Report on Form 10-Q/A for the quarter ended
            September 30, 1994.***
 10.28   -- Processing and Supply Agreement dated as of September 1, 1994 between Registrant
            and Sanofi Winthrop L.P. Incorporated herein by reference to Exhibit 6(a) to the
            Registrant's Quarterly Report on Form 10-Q for the quarter ended September 30,
            1994.
 10.29   -- Amendment dated March 24, 1995 to Distribution Agreement dated as of February 3,
            1994 between Registrant and Industria Farmaceutica Andromaco S.A. Incorporated
            herein by reference to Exhibit 10.30 to the Registrant's Annual Report on Form 10-K
            for the year ended December 31, 1994.
 10.30   -- Purchase and Exchange Agreement dated as of December 6, 1994 between the
            Registrant, David Blech and certain designated purchasers. Incorporated herein by
            reference to Exhibit 10.31 to the Registrant's Annual Report on Form 10-K for the
            year ended December 31, 1994.
 10.31   -- Purchase and Exchange Agreement dated as of January 31, 1995 between the Registrant
            and Neoprobe Corp. Incorporated herein by reference to Exhibit 10.32 to the
            Registrant's Annual Report on Form 10-K for the year ended December 31, 1994.
 10.32   -- Stock Purchase Agreement dated as of January 24, 1995 between the Registrant and
            Fujimoto Diagnostics, Inc. Incorporated herein by reference to Exhibit 10.33 to the
            Registrant's Annual Report on Form 10-K for the year ended December 31, 1994.
 10.33   -- Agreement dated as of January 24, 1995 between the Registrant and Fujimoto
            Diagnostics, Inc. Incorporated herein by reference to Exhibit 10.34 to the
            Registrant's Annual Report on Form 10-K for the year ended December 31, 1994.
</TABLE>
    
 
                                      II-3
<PAGE>   85
 
   
<TABLE>
<S>    <C>  <C>
 10.34   -- Form of Stock Purchase Agreement dated as of August 31, 1994 between the Registrant
            and Dimensional Funds Advisors, Inc. Incorporated herein by reference to Exhibit
            10.35 to the Registrant's Annual Report on Form 10-K for the year ended December
            31, 1994.
 10.35   -- Form of Warrant Agreement dated as of August 31, 1994 between the Registrant and
            Capello Capital Corp. Incorporated herein by reference to Exhibit 10.36 to the
            Registrant's Annual Report on Form 10-K for the year ended December 31, 1994.
 10.36   -- Amendment dated March 29, 1995 to Agreement dated January 26, 1994 between the
            Registrant and Purdue Frederick Company. Incorporated herein by reference to
            Exhibit 10.37 to the Registrant's Annual Report on Form 10-K for the year ended
            December 31, 1994.
 10.37   -- Amendment dated March 29, 1995 to Agreement dated January 26, 1994 between the
            Registrant, Banela Corporation and Runham Corporation. Incorporated herein by
            reference to Exhibit 10.38 to the Registrant's Annual Report on Form 10-K for the
            year ended December 31, 1994.
 10.38   -- Amendment dated March 29, 1995 to Distribution Agreement dated June 14, 1991
            between the Registrant and Purdue Pharma L.P. Incorporated herein by reference to
            Exhibit 10.39 to the Registrant's Annual Report on Form 10-K for the year ended
            December 31, 1994.
 10.39   -- Amendment dated March 29, 1995 to Amended and Restated Distribution Agreement dated
            June 14, 1991 between the Registrant and Mundipharma Pharmaceutical Company.
            Incorporated herein by reference to Exhibit 10.40 to the Registrant's Annual Report
            on Form 10-K for the year ended December 31, 1994.
 10.40   -- Amendment dated March 29, 1995 to Amended and Restated RS Agreement dated January
            26, 1994 among the Registrant, Mundipharma Pharmaceutical Company and Purdue Pharma
            L.P. Incorporated herein by reference to Exhibit 10.41 to the Registrant's Annual
            Report on Form 10-K for the year ended December 31, 1994.
 10.41   -- Letter dated March 29, 1995 between the Registrant and Purdue Pharma L.P.
            Incorporated herein by reference to Exhibit 10.42 to the Registrant's Annual Report
            on Form 10-K for the year ended December 31, 1994.
 10.42   -- License Agreement, dated as of March 31, 1995, among the Registrant, Hoffmann-La
            Roche, Inc., and F. Hoffmann-La Roche Ltd.*
 10.43   -- Amendment of ACC/ISI License Agreement, dated April 27, 1995, between Registrant
            and Amarillo Cell Culture Company, Incorporated.*
 10.44   -- Form of note issued by the Registrant to National Patent Development Corporation,
            Biotechnology Investment Group, L.L.C., and Edward Blech Charitable Remainder
            Trust.*
 10.45   -- Form of note issued by the Registrant to National Patent Development Corporation
            and Biotechnology Investment Group, L.L.C.**
 10.46   -- Amendment, dated July 31, 1995, to the Distribution Agreement, dated June 14, 1991,
            between the Registrant and Purdue Pharma L.P.**
 10.47   -- Amendment, dated July 31, 1995, to the Amended and Restated Distribution Agreement,
            dated June 14, 1991, between the Registrant and Mundipharma Pharmaceutical
            Company.**
 10.48   -- Letter, dated July 31, 1995, between The Purdue Frederick Company and the
            Registrant.**
 10.49   -- Letter, dated July 31, 1995, by and among the Registrant, Banela Corporation, and
            Runham Corporation.**
 10.50   -- Amended and Restated R S Agreement, dated July 31, 1995, by and among the
            Registrant, Mundipharma Pharmaceutical Company, and Purdue Pharma L.P.**
 10.51   -- Settlement Agreement, dated April 27, 1995, among the Registrant, Amarillo Cell
            Culture Company, Incorporated, Pharma Pacific Management Pty. Ltd., Pharma Pacific
            Pty. Ltd., Pharma Pacific Ltd., and Fernz Corporation Limited.**
 10.52   -- PPM/ACC Sub License Agreement, dated April 27, 1995, between Pharma Pacific
            Management Pty. Ltd and Amarillo Cell Culture Company, Incorporated.**
 10.53   -- Letter Agreement, dated April 29, 1992, between the Registrant and Strategic Growth
            International, Inc.****
 10.54   -- Agreement, dated May 27, 1993, between the Registrant and Strategic Growth
            International, Inc.****
 10.55   -- Sub-lease Agreement, dated             , 1995, between the Registrant and National
            Patent Development Corporation****
</TABLE>
    
 
                                      II-4
<PAGE>   86
 
   
<TABLE>
<S>    <C>  <C>
  23.1   -- Consent of Independent Auditors.**
  23.2   -- Consent of Lawrence M. Gordon (to be included in Exhibit 5.1).****
</TABLE>
    
 
(b) Financial Statement Schedules:
 
    None
- ---------------
   * Previously filed.
 
  ** Filed herewith.
 
 *** Confidential treatment has been granted for portions of this exhibit.
 
   
**** To be filed by amendment.
    
 
ITEM 17.  UNDERTAKINGS.
 
     Insofar as indemnification for liabilities arising under the Securities
Act, as amended (the "Securities Act") may be permitted to directors, officers
and controlling persons of the Registrant pursuant to the foregoing provisions,
or otherwise, the Registrant has been advised that in the opinion of the
Securities and Exchange Commission such indemnification is against public policy
as expressed in the Securities Act and is, therefore, unenforceable. In the
event that a claim for indemnification against such liabilities (other than the
payment by the registrant of expenses incurred or paid by a director, officer or
controlling person of the Registrant 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, the registrant will, unless
in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the
Securities Act and will be governed by the final adjudication of such issue.
 
     A.  The undersigned Registrant hereby undertakes that:
 
          (1) For purposes of determining any liability under the Securities
     Act, the information omitted from the form of prospectus filed as part of
     this Registration Statement in reliance upon Rule 430A and contained in a
     form of prospectus filed by the Registrant pursuant to Rule 424(b)(1) or
     (4) or 497(h) under the Securities Act shall be deemed to be part of this
     Registration Statement as of the time it was declared effective.
 
          (2) For the purpose of determining any liability under the Securities
     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.
 
     B.  The undersigned Registrant hereby undertakes:
 
          (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
        Securities 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 the registration statement; and
 
             (iii) To include any material information with respect to the plan
        of distribution not previously disclosed in the registration statement
        or any material change to such information in the registration
        statement;
 
          (2) That, for the purpose of determining any liability under the
     Securities Act, each such post-effective amendment 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 remains unsold at the
     termination of the offering.
 
                                      II-5
<PAGE>   87
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-2 and has duly caused this Amendment No. 2 to
Registration Statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of New York, and the State of New York, on this 31
day of July, 1995.
    
 
                                          INTERFERON SCIENCES, INC.
 
                                          By:   /s/ SAMUEL H. RONEL, PH.D.
                                            ------------------------------------
                                                   Samuel H. Ronel, Ph.D.
                                               President and Chief Executive
                                                           Officer
 
   
     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in their
capacities on July 31, 1995.
    
 
<TABLE>
<C>                                            <S>
            /s/ MARTIN M. POLLAK               Chairman of the Board
- ---------------------------------------------
              Martin M. Pollak

            /s/ JEROME I. FELDMAN              Chairman of the Board's Executive Committee,
- ---------------------------------------------  Treasurer and Director
              Jerome I. Feldman

         /s/ SAMUEL H. RONEL, PH.D.            President, Chief Executive Officer, and
- ---------------------------------------------  Director
           Samuel H. Ronel, Ph.D.              (Principal Executive Officer)

      /s/ STANLEY G. SCHUTZBANK, PH.D.         Executive Vice President and Director
- ---------------------------------------------
        Stanley G. Schutzbank, Ph.D.

                                               Director
- ---------------------------------------------
            Leon Botstein, Ph.D.

                                               Director
- ---------------------------------------------
          Sheldon L. Glashow, Ph.D

                                               Director
- ---------------------------------------------
            Roald Hoffmann, Ph.D

              /s/ OGDEN R. REID                Director
- ---------------------------------------------
                Ogden R. Reid

           /s/ DONALD W. ANDERSON              Controller (Principal Accounting and Financial
- ---------------------------------------------  Officer)
             Donald W. Anderson
</TABLE>
 
     The foregoing constitute a majority of the members of the Board of
Directors.
 
                                      II-6
<PAGE>   88
 
                               INDEX TO EXHIBITS
 
<TABLE>
<CAPTION>
                                                                                       SEQUENTIALLY
EXHIBIT                                                                                  NUMBERED
NUMBER                                    DESCRIPTION                                      PAGE
- ------      ------------------------------------------------------------------------   ------------
<S>    <C>  <C>                                                                        <C>
   (a)   -- Exhibits
   1.1   -- Form of Underwriting Agreement between the Registrant and Sunrise
            Securities Corp.*
   1.2   -- Form of Subscription Agreement*
   1.3   -- Form of Escrow Agreement*
   1.4   -- Form of Master Selected Dealer Agreement*
   3.1   -- Restated Certificate of Incorporation of the Registrant. Incorporated
            herein by reference to Exhibit 3B of the Registrant's Annual Report on
            Form 10-K for the year ended December 31, 1988.
</TABLE>
 
   
<TABLE>
<S>    <C>  <C>                                                                        <C>
   3.2   -- Certificate of Amendment of Restated Certificate of Incorporation of the
            Registrant. Incorporated herein by reference to Exhibit 3.4 of
            Registration Statement No. 33- 40902.
   3.3   -- Certificate of Amendment to the Restated Certificate of Incorporation of
            the Registrant. Incorporated herein by reference to Exhibit 3.2 of
            Registration Statement No. 33-78952.
   3.4   -- By-Laws of the Registrant, as amended. Incorporated herein by reference
            to Exhibit 3.2 of Registration Statement No. 2-7117.
   4.1   -- Form of Underwriter's Purchase Options.*
   4.2   -- Underwriter's Warrant dated October 29, 1991 between the Registrant and
            Commonwealth Associates. Incorporated herein by reference to Exhibit 4.2
            of Registration Statement No. 33-40902.
   4.3   -- Agam Warrant dated October 29, 1991 between the Registrant and Jacob
            Agam. Incorporated herein by reference to Exhibit 4.3 of the
            Registrant's Annual Report on Form 10-K for the year ended December 31,
            1991.
   5.1   -- Opinion of Lawrence M. Gordon, Esq., General Counsel, Registrant, as to
            the legality of the securities being registered.****
  10.1   -- Transfer and License Agreement among National Patent, Hydron
            Laboratories, Inc. and the Registrant dated as of January 1, 1981.
            Incorporated herein by reference to Exhibit 10.8 of the Registrant's
            Registration Statement No. 2-71117.
  10.2   -- Management Services Agreement dated January 1, 1981 between the
            Registrant and National Patent. Incorporated herein by reference to
            Exhibit 10.9 of the Registration Statement No. 2-71117.
  10.3   -- Registrant's 1981 Stock Option Plan, as amended.****
  10.4   -- Cross License Agreement dated October 26, 1984 between the Registrant
            and the Partnership. Incorporated herein by reference to Exhibit 10V of
            the Registrant's Annual Report on Form 10-K for the year ended December
            31, 1984.
  10.5   -- Deleted
  10.6   -- Deleted
  10.7   -- Deleted
  10.8   -- Deleted
  10.9   -- Supply Agreement dated September 25, 1992 between the Registrant and
            Celltech Limited. Incorporated herein by reference to Exhibit 10.27 of
            the Registrant's Annual Report on Form 10-K for the year ended December
            31, 1992.
 10.10   -- Deleted
</TABLE>
    
<PAGE>   89
 
   
<TABLE>
<CAPTION>
                                                                                       SEQUENTIALLY
EXHIBIT                                                                                  NUMBERED
NUMBER                                    DESCRIPTION                                      PAGE
- ------      ------------------------------------------------------------------------   ------------
<C>    <C>  <S>                                                                        <C>
 10.11   -- Profit Sharing Plan of the Registrant. Incorporated herein by reference
            to Exhibit 10X of the Registrant's Annual Report on Form 10-K for the
            year ended December 31, 1988.
 10.12   -- License Agreement dated October 20, 1989 between the Registrant and
            Amarillo Cell Culture Company, Incorporated. Incorporated herein by
            reference to Exhibit 10Y of the Registrant's Annual Report on Form 10K
            for the year ended December 31, 1989.(1)
 10.13   -- Deleted
 10.14   -- Deleted
 10.15   -- Distribution Agreement dated June 14, 1991 between Purdue Pharma L.P.
            and the Registrant. Incorporated herein by reference to Exhibit 10.26 of
            Registration Statement No. 33-40902.
 10.16   -- Amended and Restated Distribution Agreement dated June 14, 1991 between
            Mundipharma Pharmaceutical Corporation and the Registrant. Incorporated
            herein by reference to Exhibit 10.27 of Registration Statement No.
            33-40902.
 10.17   -- Deleted
 10.18   -- NPDC 401(k) Savings Plan dated January 9, 1992, effective March 1, 1992.
            Incorporated herein by reference to Exhibit 10.12 to the Registrant's
            Annual Report on Form 10-K for the Year ended December 31, 1992.
 10.19   -- Amendment dated January 26, 1994 to the Distribution Agreement dated
            June 14, 1991 between the Registrant and Purdue Pharma L.P. Incorporated
            herein by reference to Exhibit 10.18 to the Registrant's Annual Report
            on Form 10-K for the Year ended December 31, 1993.
 10.20   -- Amendment dated January 26, 1994 to the Amended and Restated
            Distribution Agreement dated June 14, 1991 between the Registrant and
            Mundipharma Pharmaceutical Company. Incorporated herein by reference to
            Exhibit 10.19 to the Registrant's Annual Report on Form 10-K for the
            Year ended December 31, 1993.
 10.21   -- Amended and Restated RS Agreement dated January 26, 1994 among the
            Registrant, Mundipharma Pharmaceutical Company and Purdue Pharma L.P.
            Incorporated herein by reference to Exhibit 10.20 to the Registrant's
            Annual Report on Form 10-K for the Year ended December 31, 1993.
 10.22   -- Agreement dated January 26, 1994 between the Registrant and The Purdue
            Frederick Company. Incorporated herein by reference to Exhibit 10.21 to
            the Registrant's Annual Report on Form 10-K for the Year ended December
            31, 1993.
 10.23   -- Agreement dated January 26, 1994 among the Registrant, Banela
            Corporation and Runham Corporation. Incorporated herein by reference to
            Exhibit 10.22 to the Registrant's Annual Report on Form 10-K for the
            Year ended December 31, 1993.
 10.24   -- Deleted
 10.25   -- Purchase Agreement dated as of May 28, 1993 between the Registrant and
            David Blech. Incorporated herein by reference to Exhibit 10.26 of
            Registration Statement No. 33-78952.
 10.26   -- Form of Warrant to be issued pursuant to the Purchase Agreement.
            Incorporated herein by reference to Exhibit 10.28 of Registration
            Statement No. 33-78952.
 10.27   -- Distribution Agreement dated as of February 3, 1994 between Registrant
            and Industria Farmaceutica Andromaco, S.A. Incorporated herein by
            reference to Exhibit 6(a) to the Registrant's Quarterly Report on Form
            10-Q/A for the quarter ended September 30, 1994.***
</TABLE>
    
<PAGE>   90
 
   
<TABLE>
<CAPTION>
                                                                                       SEQUENTIALLY
EXHIBIT                                                                                  NUMBERED
NUMBER                                    DESCRIPTION                                      PAGE
- ------      ------------------------------------------------------------------------   ------------
<C>    <C>  <S>                                                                        <C>
 10.28   -- Processing and Supply Agreement dated as of September 1, 1994 between
            Registrant and Sanofi Winthrop L.P. Incorporated herein by reference to
            Exhibit 6(a) to the Registrant's Quarterly Report on Form 10-Q for the
            quarter ended September 30, 1994.
 10.29   -- Amendment dated March 24, 1995 to Distribution Agreement dated as of
            February 3, 1994 between Registrant and Industria Farmaceutica Andromaco
            S.A. Incorporated herein by reference to Exhibit 10.30 to the
            Registrant's Annual Report on Form 10-K for the year ended December 31,
            1994.
 10.30   -- Purchase and Exchange Agreement dated as of December 6, 1994 between the
            Registrant, David Blech and certain designated purchasers. Incorporated
            herein by reference to Exhibit 10.31 to the Registrant's Annual Report
            on Form 10-K for the year ended December 31, 1994.
 10.31   -- Purchase and Exchange Agreement dated as of January 31, 1995 between the
            Registrant and Neoprobe Corp. Incorporated herein by reference to
            Exhibit 10.32 to the Registrant's Annual Report on Form 10-K for the
            year ended December 31, 1994.
 10.32   -- Stock Purchase Agreement dated as of January 24, 1995 between the
            Registrant and Fujimoto Diagnostics, Inc. Incorporated herein by
            reference to Exhibit 10.33 to the Registrant's Annual Report on Form
            10-K for the year ended December 31, 1994.
 10.33   -- Agreement dated as of January 24, 1995 between the Registrant and
            Fujimoto Diagnostics, Inc. Incorporated herein by reference to Exhibit
            10.34 to the Registrant's Annual Report on Form 10-K for the year ended
            December 31, 1994.
 10.34   -- Form of Stock Purchase Agreement dated as of August 31, 1994 between the
            Registrant and Dimensional Funds Advisors, Inc. Incorporated herein by
            reference to Exhibit 10.35 to the Registrant's Annual Report on Form
            10-K for the year ended December 31, 1994.
 10.35   -- Form of Warrant Agreement dated as of August 31, 1994 between the
            Registrant and Capello Capital Corp. Incorporated herein by reference to
            Exhibit 10.36 to the Registrant's Annual Report on Form 10-K for the
            year ended December 31, 1994.
 10.36   -- Amendment dated March 29, 1995 to Agreement dated January 26, 1994
            between the Registrant and Purdue Frederick Company. Incorporated herein
            by reference to Exhibit 10.37 to the Registrant's Annual Report on Form
            10-K for the year ended December 31, 1994.
 10.37   -- Amendment dated March 29, 1995 to Agreement dated January 26, 1994
            between the Registrant, Banela Corporation and Runham Corporation.
            Incorporated herein by reference to Exhibit 10.38 to the Registrant's
            Annual Report on Form 10-K for the year ended December 31, 1994.
 10.38   -- Amendment dated March 29, 1995 to Distribution Agreement dated June 14,
            1991 between the Registrant and Purdue Pharma L.P. Incorporated herein
            by reference to Exhibit 10.39 to the Registrant's Annual Report on Form
            10-K for the year ended December 31, 1994.
 10.39   -- Amendment dated March 29, 1995 to Amended and Restated Distribution
            Agreement dated June 14, 1991 between the Registrant and Mundipharma
            Pharmaceutical Company. Incorporated herein by reference to Exhibit
            10.40 to the Registrant's Annual Report on Form 10-K for the year ended
            December 31, 1994.
 10.40   -- Amendment dated March 29, 1995 to Amended and Restated RS Agreement
            dated January 26, 1994 among the Registrant, Mundipharma Pharmaceutical
            Company and Purdue Pharma L.P. Incorporated herein by reference to
            Exhibit 10.41 to the Registrant's Annual Report on Form 10-K for the
            year ended December 31, 1994.
</TABLE>
    
<PAGE>   91
 
   
<TABLE>
<CAPTION>
                                                                                       SEQUENTIALLY
EXHIBIT                                                                                  NUMBERED
NUMBER                                    DESCRIPTION                                      PAGE
- ------      ------------------------------------------------------------------------   ------------
<S>    <C>  <C>                                                                        <C>
 10.41   -- Letter dated March 29, 1995 between the Registrant and Purdue Pharma
            L.P. Incorporated herein by reference to Exhibit 10.42 to the
            Registrant's Annual Report on Form 10-K for the year ended December 31,
            1994.
 10.42   -- License Agreement, dated as of March 31, 1995, among the Registrant,
            Hoffmann-La Roche, Inc., and F. Hoffmann-La Roche Ltd.*
 10.43   -- Amendment of ACC/ISI License Agreement, dated April 27, 1995, between
            Registrant and Amarillo Cell Culture Company, Incorporated.*
 10.44   -- Form of note issued by the Registrant to National Patent Development
            Corporation, Biotechnology Investment Group, L.L.C., and Edward Blech
            Charitable Remainder Trust.*
 10.45   -- Form of note issued by the Registrant to National Patent Development
            Corporation and Biotechnology Investment Group, L.L.C.**
 10.46   -- Amendment, dated July 31, 1995, to the Distribution Agreement, dated
            June 14, 1991, between the Registrant and Purdue Pharma L.P.**
 10.47   -- Amendment, dated July 31, 1995, to the Amended and Restated Distribution
            Agreement, dated June 14, 1991, between the Registrant and Mundipharma
            Pharmaceutical Company.**
 10.48   -- Letter, dated July 31, 1995, between The Purdue Frederick Company and
            the Registrant.**
 10.49   -- Letter, dated July 31, 1995, by and among the Registrant, Banela
            Corporation, and Runham Corporation.**
 10.50   -- Amended and Restated R S Agreement, dated July 31, 1995, by and among
            the Registrant, Mundipharma Pharmaceutical Company, and Purdue Pharma
            L.P.**
 10.51   -- Settlement Agreement, dated April 27, 1995, among the Registrant,
            Amarillo Cell Culture Company, Incorporated, Pharma Pacific Management
            Pty. Ltd., Pharma Pacific Pty. Ltd., Pharma Pacific Ltd., and Fernz
            Corporation Limited.**
 10.52   -- PPM/ACC Sub License Agreement, dated April 27, 1995, between Pharma
            Pacific Management Pty. Ltd and Amarillo Cell Culture Company,
            Incorporated.**
 10.53   -- Letter Agreement, dated April 29, 1992, between the Registrant and
            Strategic Growth International, Inc.****
 10.54   -- Agreement, dated May 27, 1993, between the Registrant and Strategic
            Growth International, Inc.****
 10.55   -- Sub-lease Agreement, dated             , 1995, between the Registrant
            and National Patent Development Corporation****
  23.1   -- Consent of Independent Auditors.**
  23.2   -- Consent of Lawrence M. Gordon (to be included in Exhibit 5.1).****
</TABLE>
    
 
   
(b) Financial Statement Schedules:
    
 
   
    None
    
- ---------------
   
   * Previously filed.
    
 
   
  ** Filed herewith.
    
 
   
 *** Confidential treatment has been granted for portions of this exhibit.
    
 
   
**** To be filed by amendment.
    

<PAGE>   1
                                                                  Exhibit 10.45
                                                                  ------------- 


THIS PROMISSORY NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933,
AS AMENDED (THE "ACT"), OR ANY STATE SECURITIES LAWS AND MAY NOT BE OFFERED,
SOLD, PLEDGED, ASSIGNED, OR OTHERWISE TRANSFERRED UNLESS (1) A REGISTRATION
STATEMENT WITH RESPECT THERETO IS EFFECTIVE UNDER THE ACT AND ANY APPLICABLE
STATE SECURITIES LAWS OR (2) THE COMPANY RECEIVES AN OPINION OF COUNSEL TO THE
HOLDER OF THIS NOTE, WHICH COUNSEL AND OPINION ARE REASONABLY SATISFACTORY TO
THE COMPANY, THAT THIS NOTE MAY BE OFFERED, SOLD, PLEDGED, ASSIGNED, OR
TRANSFERRED IN THE MANNER CONTEMPLATED WITHOUT AN EFFECTIVE REGISTRATION
STATEMENT UNDER THE ACT OR APPLICABLE STATE SECURITIES LAWS.

                           INTERFERON SCIENCES, INC.
                                Promissory Note


$   ______                                                         July 17, 1995
No. __                                                        New York, New York

         INTERFERON SCIENCES, INC., a Delaware corporation (the "Company"), for
value received, hereby promises to pay to_____________________________________,
a ______ corporation with an address at _________________________, or registered
assigns (the registered holder of this Note being hereafter referred to as the
"Holder"), the principal amount of ________________ ($________), and to pay
interest on the unpaid principal balance hereof at the rate of interest per
annum from time to time announced publicly by Citibank, N.A. as its prime rate
plus 2%, all as hereafter further provided.

         1.      Issuance of Note.

         This Note is one of the promissory notes (the "Notes") in an aggregate
principal amount of $650,000 issued in July 1995.


         2.      Payments.

         (a)     Principal of this Note and interest on the unpaid principal
balance hereof shall be payable on the earlier of (i) the first date after the
date hereof that the Company receives gross proceeds (before underwriting
discounts and commissions and other expenses) of at least $7,500,000 from a
public offering of its common stock, par value $.01 per share, and (ii)
November 2, 1995.

         (b)     Any amount required to be paid under this Note which is not
paid when due shall bear interest at the rate of interest per annum from time
to time announced publicly by Citibank, N.A. as its prime rate plus 4% until
payment in full of such amount has been made;

<PAGE>   2

provided, that in no event shall any interest to be paid hereunder exceed the
maximum rate permitted by law and, in any such event, this Note shall
automatically be deemed amended to permit interest charges at an amount equal
to, but no greater than, the maximum rate permitted by law.

         (c)     The Company may, at its option, prepay this Note, in whole at
any time or in part from time to time, without premium or penalty but with
accrued interest on the principal amount being prepaid..

         (d)     All payments shall be applied first to any unpaid interest and
then to principal.

         (e)     Payments of principal and interest on this Note shall be sent
to the Holder's address set forth above or to such other address as the Holder
may designate for such purpose from time to time by written notice to the
Company, and shall be made by check in such coin or currency of the United
States of America as at the time of payment shall be legal tender for the
payment of public and private debts.

         (f)     The obligations to make the payments provided for in this Note
are absolute and unconditional and not subject to any defense, set-off,
counterclaim, rescission, recoupment, or adjustment whatsoever.

         (g)     The Company hereby expressly waives demand and presentment for
payment, notice of nonpayment, notice of dishonor, protest, notice of protest,
bringing of suit, and diligence in taking any action to collect any amount
called for hereunder, and shall be directly and primarily liable for the
payment of all sums owing and to be owing hereon, regardless of and without any
notice, diligence, act, or omission with respect to the collection of any
amount called for hereunder.


3.       Events of Default.

         The occurrence of any of the following events shall constitute an
event of default (an "Event of Default"):

         (a)     A default in the payment of interest on or principal of this
Note.

         (b)     A breach of any representation, or a default in the
performance of any covenant, of the Company in this Note, and continuance of
such breach or default for a period of 30 days after there has been given to
the Company a written notice specifying such breach or default and requiring it
to be remedied and specifying that such notice is a notice of default
hereunder.

         (c)     The entry of a decree or order by a court having jurisdiction
adjudging the Company a bankrupt or insolvent, or approving a petition seeking
reorganization, arrangement,


                                      -2-
<PAGE>   3

adjustment, or composition of or in respect of the Company, under federal
bankruptcy law, as now or hereafter constituted, or any other applicable federal
or state bankruptcy, insolvency, or other similar law, and the continuance of
any such decree or order unstayed and in effect for a period of 90 days; or the
commencement by the Company of a voluntary case under federal bankruptcy law, as
now or hereafter constituted, or any other applicable federal or state
bankruptcy, insolvency, or other similar law, or the consent by it to the
institution of bankruptcy or insolvency proceedings against it, or the filing by
it of a petition or answer or consent seeking reorganization or relief under
federal bankruptcy law or any other applicable federal or state law, or the
consent by it to the filing of such petition or to the appointment of a
receiver, liquidator, assignee, trustee, sequestrator, or similar official of
the Company or of any substantial part of its property, or the making by it of
an assignment for the benefit of creditors, or the admission by it in writing of
its inability to pay its debts generally as they become due, or the taking of
corporate action by the Company in furtherance of any such action.


         4.      Remedies Upon Default.

         (a)     Upon the occurrence and continuance of an Event of Default
referred to in Section 3(c), the unpaid principal amount then outstanding of,
and the accrued interest on, this Note shall automatically become immediately
due and payable without presentment, demand, protest, or other formalities of
any kind, all of which are hereby expressly waived by the Company.  Upon the
occurrence and continuance of an Event of Default other than one referred to in
Section 3(c), the Holder may declare the unpaid principal amount then
outstanding of this Note to be due and payable immediately, and upon any such
declaration the same shall become due and payable immediately, without
presentation, demand, protest, or other formalities of any kind, all of which
are expressly waived by the Company.

         (b)     The Holder may institute such actions or proceedings in law or
equity as it shall deem expedient for the protection of its rights and may
prosecute and enforce its claims against all assets of the Company, and in
connection with any such action or proceeding shall be entitled to receive from
the Company payment of the principal amount of this Note plus accrued interest
to the date of payment plus reasonable expenses of collection including,
without limitation, reasonable attorney's fees and expenses.


         5.      Security Interest.

         As collateral security for the prompt payment in full when due of
interest on and principal of this Note, the Company hereby grants the Holder,
together with the holders of the other Notes, a security interest in all of the
Company's right, title, and interest in any and all equipment, wherever
located, whether now existing or hereafter coming into existence (the
"Collateral").  The Holder agrees that such security interest shall be
subordinate in all respects to a security interest in the Collateral previously
granted by the Company to the holders of


                                      -3-

<PAGE>   4

notes (other than the Notes) in the aggregate principal amount of not more than
$1,070,000.  The Company shall, at the request of the Holder, execute, deliver,
file, and record any financing statements or other documents as may be
necessary or desirable to create, preserve, perfect, or validate the security
interest granted pursuant to this Section 5.  Upon the occurrence and
continuance of an Event of Default, the Holder shall, in respect of the
Collateral, have the rights and remedies of a secured party under the New York
Uniform Commercial Code.


         6.      Transfer.

         Any Notes issued upon the transfer of this Note shall be numbered and
shall be registered in a Note Register as they are issued.  The Company shall
be entitled to treat the registered holder of any Note on the Note Register as
the owner in fact thereof for all purposes and shall not be bound to recognize
any equitable or other claim to or interest in such Note on the part of any
other person, and shall not be liable for any registration or transfer of Notes
which are registered or to be registered in the name of a fiduciary or the
nominee of a fiduciary unless made with the actual knowledge that a fiduciary
or nominee is committing a breach of trust in requesting such registration or
transfer, or with the knowledge of such facts that its participation therein
amounts to bad faith.  This Note shall be transferable only on the books of the
Company upon delivery thereof duly endorsed by the Holder or by its duly
authorized attorney or representative, or accompanied by proper evidence of
succession, assignment, or authority to transfer.  In all cases of transfer by
an attorney, executor, administrator, guardian, or other legal representative,
duly authenticated evidence of its authority shall be produced.  Upon any
registration of transfer, the Company shall deliver a new Note or Notes to the
person entitled thereto.  This Note may be exchanged, at the option of the
Holder thereof, for another Note, or other Notes of different denominations, of
like tenor and representing in the aggregate a like principal amount, upon
surrender to the Company or its duly authorized agent.


         7.      Miscellaneous.

         (a)     Any notice or other communication required or permitted to be
given hereunder shall be in writing and shall be mailed by certified mail,
return receipt requested, or by Federal Express, Express Mail or similar
overnight delivery or courier service or delivered (in person or by telecopy,
telex, or similar telecommunications equipment) against receipt to the party to
whom it is to be given, (i) if to the Company, at its address at 783 Jersey
Avenue, New Brunswick, New Jersey 08901, Attn:  Chief Executive Officer, (ii)
if to the Holder, at its address set forth on the first page hereof, or (iii)
in either case, to such other address as the party shall have furnished in
writing in accordance with the provisions of this Section 7(a).  Any notice or
other communication given by certified mail shall be deemed given at the time
of certification thereof, except for a notice changing a party's address which
shall be deemed 


                                      -4-

<PAGE>   5

given at the time of receipt thereof. Any notice given by other means permitted
by this Section 7(a) shall be deemed given at the time of receipt thereof.
        
         (b)     Upon receipt of evidence satisfactory to the Company of the
loss, theft, destruction or mutilation of this Note (and upon surrender of this
Note if mutilated), the Company shall execute and deliver to the Holder a new
Note of like date, tenor, and denomination.

         (c)     No course of dealing and no delay or omission on the part of
the Holder in exercising any right or remedy shall operate as a waiver thereof
or otherwise prejudice the Holder's rights, powers, or remedies.  No right,
power or remedy conferred by this Note upon the Holder shall be exclusive of
any other right, power, or remedy referred to herein or now or hereafter
available at law, in equity, by statute, or otherwise, and all such remedies
may be exercised singly or concurrently.

         (d)     This Note may be amended only by a written instrument executed
by the Company and the Holder hereof.  Any amendment shall be endorsed upon
this Note, and all future Holders shall be bound thereby.

         (e)     This Note shall be governed by and construed in accordance
with the laws of the State of New York, without giving effect to conflict of
laws.

         IN WITNESS WHEREOF, the Company has caused this Note to be executed
and dated the day and year first above written.

                                                INTERFERON SCIENCES, INC.


                                                By:
                                                   ----------------------
                                                   Name:





                                      -5-

<PAGE>   1
                                                                EXHIBIT 10.46
                                                                -------------


                 AMENDMENT, dated July 31, 1995 to the Distribution Agreement,
dated June 14, 1991, as amended by Amendment dated January 26, 1994 and
Amendment dated March 29, 1995 (the "Distribution Agreement"), between
INTERFERON SCIENCES, INC., a Delaware corporation with an office at 783 Jersey
Avenue, New Brunswick, New Jersey 08901 ("ISI"), and PURDUE PHARMA L.P., a
Delaware limited partnership with an office at 100 Connecticut Avenue, Norwalk,
Connecticut 06850-3590 ("Purdue Pharma"),

                             W I T N E S S E T H :

                 WHEREAS, the parties wish to amend the Distribution Agreement
subject to the provisions of Section 3 hereof;

                 NOW, THEREFORE, in consideration of the mutual covenants
herein contained the parties agree as follows:

                 1.       Defined Terms.  Capitalized terms used herein without
definition shall have the same respective meanings as provided in the
Distribution Agreement.

                 2.       Amendment and Supplement.  Subject to the provisions
of Section 3 hereof, the Distribution Agreement shall be amended and
supplemented effective as of the Offering Completion Date (as defined in
Section 3 below) as follows:



<PAGE>   2

                          (a)     Section 1.  Effective as of the Offering
Completion Date, the following definitions shall be added to Section 1 of the
Distribution Agreement in the appropriate alphabetical order:

                          "Cumulative Difference" has the meaning set forth in
Section 6(g) hereof.

                          "Option Assets" has the meaning set forth in Section
20 hereof.

                          "Post-July 31, 1995 Inventory" shall mean inventory
of Alferon N Injection purchased or otherwise acquired by Purdue Pharma on or
after July 31, 1995 including inventory of Alferon N Injection ordered on or
prior to July 31, 1995 but delivered to Purdue Pharma on or after July 31,
1995.

                          "Pre-July 31, 1995 Inventory" shall mean inventory of
Alferon N Injection purchased or otherwise acquired by Purdue Pharma from ISI
prior to July 31, 1995, but excluding inventory of Alferon N Injection ordered
on or prior to July 31, 1995 but delivered to Purdue Pharma on or after July
31, 1995.

                          "$25 Termination Date" has the meaning set forth in
Section 6(g) hereof.

                          (b)     Section 2.  Effective as of the Offering
Completion Date, Section 2 of the Distribution Agreement shall be amended as
follows:


                                       2

<PAGE>   3

                          (i)     Section 2(a).  Effective as of the Offering
Completion Date, the last sentence of Section 2(a) shall be deleted from the
Distribution Agreement, and the following new sentence shall be added to the end
of Section 2(a):  "Purdue Pharma agrees to use its best efforts to sell Products
in the Territory during the term of this Agreement; it being understood,
however, that ISI confirms and agrees that Purdue Pharma has used its best
efforts to sell Products in the Territory from the date this Agreement commenced
through and including July 31, 1995, and ISI hereby further confirms and agrees
that Purdue Pharma shall have satisfied its obligation to use its best efforts
to sell Products in the Territory from and after July 31, 1995 so long as Purdue
Pharma continues to follow its marketing program as in effect on July 31, 1995."

                          (ii)    Section 2(b).  Effective as of the Offering
Completion Date, the penultimate sentence of Section 2(b) shall be deleted from
the Distribution Agreement, and the following new sentence shall replace such
deleted sentence:  "The minimum Total Sales for the first Annual Period shall be
zero, the minimum Total Sales for the second and third Annual Periods shall be
$900,000 and $1,350,000, respectively, and the minimum Total Sales for the
fourth and fifth Annual Periods and for each Annual Period thereafter shall be
$1,800,000."





                                       3
<PAGE>   4

                          (c)     Section 6.  Effective as of the Offering
Completion Date, the Distribution Agreement shall be amended and supplemented
by adding the following new subsection (g) to the end thereof:

                                  "(g)  Anything in this Agreement or otherwise
to the contrary notwithstanding, from July 31, 1995 until the $25 Termination
Date (as defined below), Purdue Pharma shall have the right to purchase from
ISI, and ISI shall have the obligation to sell to Purdue Pharma, Products at a
cost to Purdue Pharma of $25 per Vial payable upon delivery to Purdue Pharma.
Each such Vial shall have a shelf life from the date of delivery to Purdue
Pharma of 18 months less FDA clearance time, quality assurance and quality
control time; provided, however, that in no event shall such shelf life be less
than 17 months.  From July 31, 1995 until the $25 Termination Date, each time
Purdue Pharma purchases Vials from ISI at a cost of $25 per Vial, ISI shall (i)
calculate the price per Vial that ISI would otherwise have been entitled to
charge Purdue Pharma for Vials pursuant to the then applicable provisions of
this Section 6 if the $25 purchase price were not in effect, (ii) for each Vial
purchased by Purdue Pharma at a cost of $25 per Vial, maintain a written record
of the cumulative difference between the price per Vial calculated pursuant to
clause (i) of this sentence and $25 (the "Cumulative Difference"), and (iii)
promptly provide a copy of the





                                       4

<PAGE>   5

written record described in clause (ii) of this sentence to Purdue Pharma each
time ISI updates such written record.  At such time as the Cumulative
Difference equals $2,529,133, Purdue Pharma's right to purchase from ISI, and
ISI's obligation to sell to Purdue Pharma, Products at a cost to Purdue Pharma
of $25 per Vial shall terminate (the "$25 Termination Date"), and thereafter
the price per Vial shall be determined pursuant to the then applicable
provisions of this Section 6."

                          (d)     Section 9.  Effective as of the Offering
Completion Date, Section 9(b)(vii) shall be deleted from the Distribution
Agreement in its entirety, and the following references to Section 9(b)(vii)
shall be deleted from the Distribution Agreement:  (i) the words "Subject to
Section 9(b)(vii) of this Agreement" shall be deleted from the third to last
sentence of Section 6(aa) of the Distribution Agreement, (ii) the words "or its
right under Section 9(b)(vii) of this Agreement" and "or ISI's right under
Section 9(b)(vii) of this Agreement" shall be deleted from the first sentence
of Section 9(b)(v) of the Distribution Agreement and (iii) the words "or its
right under Section 9(b)(vii) of this Agreement" shall be deleted from Section
9(b)(vi) of the Distribution Agreement.

                          (e)     Section 20.  Effective as of the Offering
Completion Date, the Distribution Agreement shall be amended and supplemented
by deleting in its entirety





                                       5

<PAGE>   6

Section 20 of the Distribution Agreement and replacing it with the following
new Section 20.

                          "20.    ISI's Option.  (a)  ISI shall have the right
during the period commencing on July 31, 1995 and ending on December 31, 1996 to
acquire all of the assets of Purdue Pharma used exclusively in its Alferon N
Injection business, including, without limitation, Pre-July 31, 1995 Inventory,
marketing material, artwork, printing plates, data and copyrighted material (the
"Option Assets") and to terminate this Agreement, except that Sections 10(b), 11
and 12(a), (b), (c) and (d) of this Agreement shall survive any such
termination.  In the event that ISI elects to exercise the right described in
the preceding sentence, ISI shall give Purdue Pharma at least five days' prior
written notice of the date on which ISI intends to acquire the Option Assets and
to terminate this Agreement, and ISI shall acquire the Option Assets and this
Agreement shall terminate (except as to those surviving provisions listed above)
as of the date specified in such notice provided that such date is on or before
December 31, 1996.

                          (b)     If ISI so elects, Purdue Pharma shall continue
marketing Alferon N Injection for a period of time immediately following the
termination of this Agreement (not to exceed six months).  The cost of any Vials
purchased by Purdue Pharma from ISI during such marketing period following the
termination date shall be $45 per Vial,





                                       6

<PAGE>   7

payable $35 upon delivery to Purdue Pharma and $10 upon sale by Purdue Pharma.
If, at the end of such marketing period following the termination date, Purdue
Pharma has remaining Post-July 31, 1995 Inventory, ISI shall promptly purchase
such Post-July 31, 1995 Inventory from Purdue Pharma at the price of (i) $35
per Vial with respect to Vials purchased by Purdue Pharma after the termination
of this Agreement and (ii) the contract price per Vial calculated pursuant to
Section 6(a) of this Agreement with respect to Vials purchased prior to the
termination of this Agreement.  If ISI does not elect to have Purdue Pharma
continue to market Alferon N Injection for up to six months following the
termination of this Agreement, ISI shall purchase on the termination date
Purdue Pharma's Post-July 31, 1995 Inventory remaining on the termination date
at the contract price per Vial calculated pursuant to Section 6(a) of this
Agreement."

                 3.       EFFECTIVE DATE OF AMENDMENT.  THIS AMENDMENT SHALL
ONLY BE EFFECTIVE IF AND WHEN ISI OBTAINS BETWEEN JULY 31, 1995 AND AUGUST 31,
1995 (THE "OFFERING COMPLETION DATE") $7,800,000 OR MORE IN GROSS PROCEEDS TO
ISI FROM ISI'S CURRENTLY PROPOSED UNDERWRITTEN REGISTERED PUBLIC OFFERING OF
SHARES OF ISI'S COMMON STOCK.  ISI REPRESENTS AND WARRANTS TO, AND COVENANTS
WITH, PURDUE PHARMA THAT THE NET PROCEEDS OBTAINED BY ISI PURSUANT TO THE
PRECEDING





                                       7

<PAGE>   8

SENTENCE WILL ONLY BE USED FOR THE FOLLOWING PURPOSES:  RESEARCH, DEVELOPMENT
AND CLINICAL TRIALS OF ISI'S PRODUCTS, REPAYMENT OF INDEBTEDNESS, WORKING
CAPITAL AND GENERAL CORPORATE PURPOSES; IT BEING UNDERSTOOD THAT ISI SHALL
ALLOCATE A PORTION OF SUCH PROCEEDS TO THE OPERATION OF ITS MANUFACTURING
FACILITY IN SUCH AMOUNT AS SHALL BE NEEDED TO ENABLE ISI TO CONTINUOUSLY SUPPLY
VIALS TO PURDUE PHARMA PURSUANT TO THE PROVISIONS OF THIS AGREEMENT, INCLUDING,
WITHOUT LIMITATION, THE PROVISIONS OF SECTION 6(G) HEREOF; AND, IT BEING
FURTHER UNDERSTOOD THAT ISI SHALL NOT REPAY MORE THAN $1,600,000 OF ITS
INDEBTEDNESS FROM THE PROCEEDS OF SUCH PUBLIC OFFERING PLUS ANY ADDITIONAL
ADVANCES (NOT TO EXCEED $500,000) INCURRED AFTER THE DATE HEREOF.  IF ISI FAILS
TO OBTAIN $7,800,000 OR MORE ON OR BEFORE THE OFFERING COMPLETION DATE, THIS
AMENDMENT SHALL BE NULL AND VOID, AND THE DISTRIBUTION AGREEMENT AND ALL
PROVISIONS THEREOF SHALL CONTINUE IN FULL FORCE AND EFFECT AS IF THIS AMENDMENT
HAD NEVER EXISTED.

                 4.       Miscellaneous.

                          (a)     Except as expressly provided in Sections 2 and
3 of this Agreement, the Distribution Agreement and all provisions therein shall
continue in full force and effect without any modification or amendment.

                          (b)     This Amendment may be executed in
counterparts, each of which when so executed and delivered





                                       8

<PAGE>   9

shall constitute an original and all of which together shall constitute one and
the same instrument.

                 IN WITNESS WHEREOF, the parties hereto have duly executed this
Amendment the day and year first above written.

                                                  INTERFERON SCIENCES, INC.

                                                  By___________________________
                                                    Title:  Vice President

                                                  PURDUE PHARMA L.P.

                                                  By:  Purdue Pharma Inc.,
                                                       its general partner
                                                  By___________________________
                                                    Title:  Vice President






                                       9


<PAGE>   1
                                                                EXHIBIT 10.47
                                                                -------------


                 AMENDMENT, dated July 31, 1995, to the Amended and Restated
Distribution Agreement, dated June 14, 1991, as further amended by letter
agreement dated May 24, 1993, Amendment dated January 26, 1994 and Amendment
dated March 29, 1995 (the "Distribution Agreement"), between INTERFERON
SCIENCES, INC., a Delaware corporation with an office at 783 Jersey Avenue, New
Brunswick, New Jersey 08901 ("ISI"), and MUNDIPHARMA PHARMACEUTICAL COMPANY, a
Bermuda general partnership with an office at Mundipharma House, 14
Par-la-Ville Road, Hamilton HMJX, Bermuda ("MPCO"),

                             W I T N E S S E T H :

                 WHEREAS, the parties wish to amend the Distribution Agreement
subject to the provisions of Section 3 hereof;

                 NOW, THEREFORE, in consideration of the mutual covenants
herein contained the parties agree as follows:

                 1.       Defined Terms.  Capitalized terms used herein without
definition shall have the same respective meanings as provided in the
Distribution Agreement.

                 2.       Amendment and Supplement.  Subject to the provisions
of Section 3 hereof, the Distribution Agreement shall be amended and
supplemented effective as of the

<PAGE>   2

Offering Completion Date (as defined in Section 3 below) as follows:

                          (a)  Section 1.  Effective as of the Offering
Completion Date, the following definitions shall be added to Section 1 of the
Distribution Agreement in the appropriate alphabetical order:

                          "Option Assets" has the meaning set forth in Section
19 hereof.

                          "Option Closing Date" has the meaning set forth in
Section 19 hereof.

                          "Securities Act" has the meaning set forth in Section
19 hereof.

                          "350,000 Option Shares" has the meaning set forth in
Section 19 hereof.

                          "750,000 Option Shares" has the meaning set forth in
Section 19 hereof.

                          (b)  Section 2.  Effective as of the Offering
Completion Date, the penultimate sentence of Section 2(b) shall be deleted from
the Distribution Agreement, and the following new sentence shall replace such
deleted sentence:  "The minimum Total Sales for the first Annual Period shall
be zero, the minimum Total Sales for the second and third Annual Periods shall
be $100,000 and $150,000, respectively, and the minimum Total Sales for the
fourth and fifth Annual Periods and for each Annual Period thereafter shall be
$200,000."



                                       2

<PAGE>   3

                          (c)  Section 9.  Effective as of the Offering
Completion Date, Section 9(b)(vii) shall be deleted from the Distribution
Agreement in its entirety, and the following references to Section 9(b)(vii)
shall be deleted from the Distribution Agreement:  (i) the words "or its right
under Section 9(b)(vii) of this Agreement" and "or ISI's right under Section
9(b)(vii) of this Agreement" shall be deleted from the first sentence of
Section 9(b)(v) of the Distribution Agreement and (ii) the words "or its right
under Section 9(b)(vii) of the Agreement" shall be deleted from Section
9(b)(vi) of the Distribution Agreement.

                          (d)  Section 19.  Effective as of the Offering
Completion Date, the Distribution Agreement shall be amended and supplemented
by deleting in its entirety Section 19 of the Distribution Agreement and
replacing it with the following new Section 19:

                          "19. ISI's Option.

                          (a)  ISI shall have the right during the period
commencing on July 31, 1995 and ending on December 31, 1996 to acquire all of
the assets of MPCO used exclusively in its Alferon N Injection business,
including, without limitation, inventory purchased by MPCO prior to July 31,
1995, marketing material, artwork, printing plates, data and copyrighted
material (the "Option Assets") and to terminate this Agreement, including,
without limitation, the royalty obligations set forth in Section 2(e) hereof,
except



                                       3

<PAGE>   4

that Sections 10(b), 11 and 12(a), (b), (c) and (d) of this Agreement shall
survive any such termination.  In the event that ISI elects to acquire the
Option Assets and to terminate this Agreement, (i) ISI shall give MPCO at least
five days' prior written notice of the date on which ISI intends to acquire the
Option Assets and to terminate this Agreement, which date shall be on or before
December 31, 1996 (the "Option Closing Date"), and (ii) ISI shall deliver to
MPCO on the Option Closing Date as consideration for ISI's acquisition of the
Option Assets and termination of this Agreement (A) $2,500,000 in immediately
available funds and either (B) if the Option Closing Date is on or before
December 31, 1995, 350,000 registered shares of ISI's Common Stock, subject to
adjustment in accordance with Section 19(i) below (the "350,000 Option Shares")
or (C) if the Option Closing Date is after December 31, 1995 and on or before
December 31, 1996, 750,000 registered shares of ISI's Common Stock, subject to
adjustment in accordance with Section 19(i) below (the "750,000 Option
Shares").  Upon such delivery pursuant to the immediately preceding sentence,
ISI shall acquire the Option Assets and this Agreement shall be terminated,
except as to those surviving provisions listed above.

                          (b)  In the event that ISI issues pursuant to Section
19(a) the 350,000 Option Shares or the 750,000 Option Shares, as the case may
be, on or before the Option



                                       4

<PAGE>   5

Closing Date, ISI shall have prepared and filed with the Securities and
Exchange Commission a registration statement in compliance with the Securities
Act of 1933, as amended (the "Securities Act"), registering for the benefit of
MPCO all of the 350,000 Option Shares or the 750,000 Option Shares, as the case
may be, with the result that MPCO shall be able to sell all or any portion of
the 350,000 Option Shares or the 750,000 Option Shares, as the case may be,
pursuant to said registration statement commencing with the Option Closing
Date.  MPCO agrees to cooperate with ISI, to provide ISI information reasonably
requested by ISI to register the 350,000 Option Shares or the 750,000 Option
Shares, as the case may be, and to comply with all laws applicable to MPCO with
respect to such registration.  All expenses incurred in connection with any
registration pursuant to this Section 19, including, without limitation, all
registration, filing and qualification fees, printers' and accounting fees, and
fees and disbursements of counsel for ISI (but excluding the fees and
disbursements of MPCO's counsel and underwriting discounts and commissions
incurred by MPCO), shall be borne by ISI.

                          (c)  ISI shall keep MPCO advised in writing as to the
initiation of the registration and as to the completion thereof.  ISI shall:

                               (i)  Use its best efforts to cause such
registration to become and remain effective until the date



                                       5

<PAGE>   6

on which the distribution described in the registration statement has been
completed;

                              (ii)  Furnish to MPCO such reasonable number of
copies of the registration statement, preliminary prospectus, final prospectus
and such other documents as MPCO may reasonably request in order to facilitate
the public offering of such registered securities; and

                             (iii)  During the period set forth in Section
19(c)(i), prepare and file with the Securities and Exchange Commission such
amendments and supplements to such registration statement and the 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
disposition of all securities covered by such registration statement.

                          (d)  MPCO agrees to indemnify ISI, its directors and
officers and each person controlling ISI for any costs or expenses incurred by
it or them for any material breach of MPCO's agreements under this Section 19
or failure by MPCO to comply with any law applicable to MPCO with respect to
registration pursuant to this Section 19 and in respect of any untrue statement
of a material fact contained in the registration statement or any omission to
state therein a material fact required to be stated therein or necessary to
make the statements therein not misleading but only to the extent that such
untrue statement or



                                       6

<PAGE>   7

omission is made in such registration statement in reliance upon and in
conformity with written information furnished to ISI by or on behalf of MPCO
for use in the preparation of such registration statement or prospectus
included therein.  ISI will indemnify MPCO, its partners and agents and each
person controlling MPCO, if any, for any costs or expenses incurred by it, him
or them for any material breach of ISI's agreements under this Section 19 or
noncompliance with law in respect of this Section 19 and in respect of any
untrue statement of a material fact contained in the registration statement or
any omission to state therein a material fact required to be stated therein or
necessary to make the statements therein not misleading, provided that ISI will
not be liable in any such case to the extent that any such cost or expense
arises out of or is based upon any untrue statement or omission made in
reliance upon and in conformity with written information furnished to ISI by or
on behalf of MPCO for use in the preparation of such registration statement or
prospectus therein.

                          (e)  ISI will use its best efforts to qualify the
350,000 Option Shares or the 750,000 Option Shares, as the case may be,
registered pursuant to this Section 19 under the state securities or "blue sky"
laws of any state reasonably requested by MPCO if ISI has previously qualified
under the state securities or "blue sky" laws in such state.



                                       7

<PAGE>   8

                          (f)  The registration rights contained in this
Section 19 may be assigned by MPCO (i) in connection with a transfer to any
affiliate or affiliates of MPCO or (ii) to a transferee or assignee reasonably
acceptable to ISI in connection with any transfer or assignment of the all or
any portion of the 350,000 Option Shares or the 750,000 Option Shares, as the
case may be, subject to registration pursuant to this Section 19, provided that
such transfer or assignment may otherwise be effected in accordance with
applicable securities laws.

                          (g)  ISI represents and warrants to, and covenants
with, MPCO as follows:

                               (i)  Prior to the exercise of its option
rights under this Section 19, ISI shall have authorized by all necessary
corporate action on the part of ISI the issuance, delivery and the registration
of the 350,000 Option Shares or the 750,000 Option Shares, as the case may be;

                              (ii)  ISI has, and will have on the Option
Closing Date, the requisite legal and corporate power and authority to issue
the 350,000 Option Shares or the 750,000 Option Shares, as the case may be,
hereunder and to carry out and perform its obligations under the terms of this
Agreement;

                             (iii)  The issuance and registration of the
350,000 Option Shares or the 750,000 Option Shares, as



                                       8

<PAGE>   9

the case may be, will not result in any violation of, or conflict with, or
constitute a default under, ISI's certificate of incorporation, as amended, or
by-laws or any of ISI's agreements or obligations, or result in the creation of
any mortgage, pledge, lien, security interest, encumbrance or charge upon any
of the properties or assets of ISI; and

                              (iv)  The 350,000 Option Shares or the 750,000
Option Shares, as the case may be, issued and delivered to MPCO will be duly
and validly issued, fully paid and nonassessable, will have the rights, powers
and privileges described in ISI's certificate of incorporation, as amended, and
will be free of any liens or encumbrances, other than any liens or encumbrances
created by or imposed upon the holders thereof through no action of ISI;
provided, however, that the 350,000 Option Shares or the 750,000 Option Shares,
as the case may be, may be subject to restrictions on transfer under state
and/or federal securities laws until they are registered in accordance with the
terms of this Agreement.

                          (h)  MPCO represents and warrants to, and covenants
with, ISI as follows:

                               (i)  MPCO is, and will be on the Closing Date,
an "Accredited Investor" as defined under the Securities Act.



                                       9

<PAGE>   10

                              (ii)  If MPCO acquires the 350,000 Option Shares
or the 750,000 Option Shares, as the case may be, any such acquisition will be
for MPCO's own account, for investment and not with a view toward, or for
resale in connection with, the distribution thereof or with any present
intention of distributing or reselling any portion thereof.

                             (iii)  MPCO, and its advisors and designated
representatives, if any, have the knowledge and experience in financial and
business matters necessary to permit MPCO to evaluate the merits and risks of
an investment in the 350,000 Option Shares or the 750,000 Option Shares, as the
case may be.

                              (iv)  MPCO confirms that it has had an
opportunity to ask questions of and receive answers from ISI, or a person or
persons authorized to act on ISI's behalf, concerning the terms and conditions
of an investment in the 350,000 Option Shares or the 750,000 Option Shares, as
the case may be.

                          (i)  In the event that ISI shall, at any time prior
to the Option Closing Date:  (i) declare or pay to the holders of its Common
Stock a dividend payable in any kind of shares of stock of ISI; or (ii) change
or divide or otherwise reclassify its Common Stock into the same or a different
number of shares with or without par value, or into shares of any class or
classes; or (iii) consolidate or



                                       10

<PAGE>   11

merge with, or transfer its property as an entirety or substantially as an
entirety to, any other corporation or entity; or (iv) make any distribution of
its assets to holders of its Common Stock as a liquidation or partial
liquidation dividend or by way of return of capital; then, on the Option
Closing Date ISI shall deliver to MPCO (i) the 350,000 Option Shares or the
750,000 Option Shares, as the case may be, plus such additional shares of stock
of ISI, or such reclassified shares of stock of ISI, or such shares of the
securities or property of ISI resulting from such consolidation or merger or
transfer, or such assets of ISI, which MPCO would have been entitled to receive
had MPCO received the 350,000 Option Shares or the 750,000 Option Shares, as
the case may be, immediately prior to the happening of any of the foregoing
events.  Nothing contained herein shall require ISI to segregate or otherwise
set aside any particular asset for possible distribution to MPCO on the Option
Closing Date subsequent to a liquidation, partial or otherwise."

                 3.  EFFECTIVE DATE OF AMENDMENT.  THIS AMENDMENT SHALL ONLY BE
EFFECTIVE IF AND WHEN ISI OBTAINS BETWEEN JULY 31, 1995 AND AUGUST 31, 1995
(THE "OFFERING COMPLETION DATE") $7,800,000 OR MORE IN GROSS PROCEEDS TO ISI
FROM ISI'S CURRENTLY PROPOSED UNDERWRITTEN REGISTERED PUBLIC OFFERING OF SHARES
OF ISI'S COMMON STOCK.  ISI REPRESENTS



                                       11

<PAGE>   12

AND WARRANTS TO, AND COVENANTS WITH, MPCO THAT THE NET PROCEEDS OBTAINED BY ISI
PURSUANT TO THE PRECEDING SENTENCE WILL ONLY BE USED FOR THE FOLLOWING
PURPOSES:  RESEARCH, DEVELOPMENT AND CLINICAL TRIALS OF ISI'S PRODUCTS,
REPAYMENT OF INDEBTEDNESS, WORKING CAPITAL AND GENERAL CORPORATE PURPOSES; IT
BEING UNDERSTOOD THAT ISI SHALL ALLOCATE A PORTION OF SUCH PROCEEDS TO THE
OPERATION OF ITS MANUFACTURING FACILITY IN SUCH AMOUNT AS SHALL BE NEEDED TO
ENABLE ISI TO CONTINUOUSLY SUPPLY VIALS TO MPCO PURSUANT TO THE PROVISIONS OF
THIS AGREEMENT; AND, IT BEING FURTHER UNDERSTOOD THAT ISI SHALL NOT REPAY MORE
THAN $1,600,000 OF ITS INDEBTEDNESS FROM THE PROCEEDS OF SUCH PUBLIC OFFERING
PLUS ANY ADDITIONAL ADVANCES (NOT TO EXCEED $500,000) INCURRED AFTER THE DATE
HEREOF.  IF ISI FAILS TO OBTAIN $7,800,000 OR MORE ON OR BEFORE THE OFFERING
COMPLETION DATE, THIS AMENDMENT SHALL BE NULL AND VOID, AND THE DISTRIBUTION
AGREEMENT AND ALL PROVISIONS THEREOF SHALL CONTINUE IN FULL FORCE AND EFFECT AS
IF THIS AMENDMENT HAD NEVER EXISTED.

                 4.  Miscellaneous.

                          (a)  Except as expressly provided in Sections 2 and 3
of this Amendment, the Distribution Agreement and all provisions therein shall
continue in full force and effect without any modification or amendment.



                                       12

<PAGE>   13

                          (b)  This Amendment may be executed in counterparts,
each of which when so executed and delivered shall constitute an original and
all of which together shall constitute one and the same instrument.

                 IN WITNESS WHEREOF, the parties hereto have duly executed this
Amendment the day and year first above written.

                                                INTERFERON SCIENCES, INC.

                                                By___________________________
                                                  Title:  Vice President

                                                MUNDIPHARMA PHARMACEUTICAL
                                                COMPANY

                                                By___________________________
                                                  Title:  General Manager



                                       13


<PAGE>   1
                                                                EXHIBIT 10.48
                                                                -------------


                           INTERFERON SCIENCES, INC.
                                783 JERSEY AVE.
                        NEW BRUNSWICK, NEW JERSEY 08901



                                 July 31, 1995


The Purdue Frederick Company
100 Connecticut Avenue
Norwalk, Connecticut  06850-3590

Dear Sirs:

                 Reference is hereby made to that certain Stock Purchase
Agreement between us dated June 14, 1991 whereby The Purdue Frederick Company
("PF") acquired shares of Common Stock of Interferon Sciences, Inc. ("ISI"),
and that certain Agreement dated January 26, 1994, as amended by Amendment
dated March 29, 1995 (the "Stock Sale Agreement"), pursuant to which ISI agreed
to purchase from PF, and PF agreed to sell to ISI, all of the shares of ISI's
Common Stock owned by PF.  Capitalized terms used herein without definition
shall have the same respective meanings as provided in the Stock Sale
Agreement.

                 This letter is to confirm our agreement that:

                 1.       The Closing Date for ISI's obligation to purchase
from PF, and PF's obligation to sell to ISI, 541,944 shares of ISI's Common
Stock on July 25, 1995 pursuant to the Stock Sale Agreement is hereby extended
from July 25, 1995 until the first to occur of (a) August 31, 1995 or (b) the
date on which ISI is first informed that ISI has been unable to obtain
$7,800,000 or more in gross proceeds to ISI from ISI's currently proposed
underwritten registered public offering of shares of ISI's Common Stock ("ISI's
Public Offering").

                 2.       In the event that on or before August 31, 1995 ISI
obtains $7,800,000 or more in gross proceeds to ISI from ISI's Public Offering,
then, upon receipt by PF of a letter from ISI and the underwriter of ISI's
Public Offering notifying PF that ISI has obtained such proceeds, the Stock
Sale Agreement shall be automatically terminated without further action by the
parties with the result that PF shall continue to own, and shall be free to
sell, subject to applicable securities laws, its 541,944 shares of ISI Common
Stock, and ISI shall no longer have any obligation to purchase any of such
shares

<PAGE>   2

from PF; provided, however, that, during the period from the date hereof until
December 31, 1996, PF shall not sell or otherwise dispose of any of its 541,944
shares of ISI Common Stock without the consent of ISI, except that the
foregoing prohibition against sale and disposition shall not apply to any sale
or disposition to any one or more affiliates of PF; provided that any such
affiliate agrees to be bound by the provisions of this letter.

                 Except as otherwise expressly provided in paragraphs 1 and 2
above, the Stock Sale Agreement and all provisions therein shall continue in
full force and effect without any modification or amendment.

                 If you agree with the foregoing, kindly evidence your
agreement by signing the enclosed copy of this letter in the space provided
below and by returning the enclosed copy to the undersigned.

                                           Very truly yours,

                                           INTERFERON SCIENCES, INC.

                                           By_____________________________
                                             Title:  Vice President


ACCEPTED AND AGREED:

THE PURDUE FREDERICK COMPANY

By____________________________
  Title:  Group Vice President



                                       2


<PAGE>   1
                                                                EXHIBIT 10.49
                                                                -------------



                           INTERFERON SCIENCES, INC.
                               783 JERSEY AVENUE
                        NEW BRUNSWICK, NEW JERSEY 08901




                                 July 31, 1995


Banela Corporation
14 Par-la-Ville Road
Hamilton HMJX
Bermuda

Runham Corporation
4045 N.W. 64th Street
Suite 630
Oklahoma City, Oklahoma  73116

Dear Sirs:

                 Reference is hereby made to that certain Stock Purchase
Agreement among us dated June 14, 1991 whereby Banela Corporation ("Banela")
and Runham Corporation ("Runham") acquired shares of Common Stock of Interferon
Sciences, Inc. ("ISI"), and that certain Agreement dated January 26, 1994, as
amended by Amendment dated March 29, 1995 (the "Stock Sale Agreement"),
pursuant to which ISI agreed to purchase from Banela and Runham, and Banela and
Runham agreed to sell to ISI, all of the shares of ISI's Common Stock owned by
Banela and Runham.  Capitalized terms used herein without definition shall have
the same respective meanings as provided in the Stock Sale Agreement.

                 This letter is to confirm our agreement that:

                 1.       ISI's obligation to purchase from each of Banela and
Runham, and each of Banela's and Runham's obligation to sell to ISI, 39,025
shares of ISI's Common Stock on July 25, 1995 pursuant to the Stock Sale
Agreement is hereby extended from July 25, 1995 until the first to occur of (a)
August 31, 1995 or (b) the date on which ISI is first informed that ISI has
been unable to obtain $7,800,000 or more in gross proceeds to ISI from ISI's
currently proposed underwritten registered public offering of shares of ISI's
Common Stock ("ISI's Public Offering").

                 2.       In the event that on or before August 31, 1995 ISI
obtains $7,800,000 or more in gross proceeds to ISI from ISI's Public Offering,
then, upon receipt by Banela and Runham of a letter from ISI and the
underwriter of ISI's Public Offering notifying Banela and

<PAGE>   2

Runham that ISI has obtained such proceeds, the Stock Sale Agreement shall be
automatically terminated without further action by the parties with the result
that Banela and Runham shall each continue to own, and shall be free to sell,
subject to applicable securities laws, its 39,025 shares of ISI Common Stock,
and ISI shall no longer have any obligation to purchase any of such shares from
Banela and Runham; provided, however, that, during the period from the date
hereof until December 31, 1996, neither Banela nor Runham shall sell or
otherwise dispose of any of its 39,025 shares of ISI Common Stock without the
consent of ISI, except that the foregoing prohibition against sale and
disposition shall not apply to any sale or disposition to any one or more
affiliates of Banela or Runham; provided that any such affiliate agrees to be
bound by the provisions of this letter.

                 Except as otherwise expressly provided in paragraphs 1 and 2
above, the Stock Sale Agreement and all provisions therein shall continue in
full force and effect without any modification or amendment.

                 If you agree with the foregoing, kindly evidence your
agreement by signing the enclosed copy of this letter in the space provided
below and by returning the enclosed copy to the undersigned.

                                           Very truly yours,

                                           INTERFERON SCIENCES, INC.

                                           By_____________________________
                                             Title:  Vice President

ACCEPTED AND AGREED:

BANELA CORPORATION

By_________________________
  Title:  Director

RUNHAM CORPORATION

By_________________________
  Title:  Vice President



                                       2


<PAGE>   1
                                                                EXHIBIT 10.50
                                                                -------------


                       AMENDED AND RESTATED R S AGREEMENT

          This AMENDED AND RESTATED R S AGREEMENT (the "Agreement"), dated July
31, 1995, by and among INTERFERON SCIENCES, INC., a Delaware corporation with
an office at 783 Jersey Avenue, New Brunswick, New Jersey 08901 ("ISI"),
MUNDIPHARMA PHARMACEUTICAL COMPANY, a Bermuda general partnership with an
office at Mundipharma House, P.O. Box HM 2332, 14 Par-la-Ville Road, Hamilton
HMJX, Bermuda ("MPCO"), and PURDUE PHARMA L.P., a Delaware limited partnership
with an office at 100 Connecticut Avenue, Norwalk, Connecticut 06850-3590
("Purdue Pharma"),

                             W I T N E S S E T H :

          WHEREAS, ISI and MPCO are parties to an Amended and Restated
Distribution Agreement dated June 14, 1991, as amended by letter agreement
dated May 24, 1993, Amendment dated January 26, 1994, Amendment dated March 29,
1995 and Amendment dated the date hereof (the "MPCO Agreement"); and

          WHEREAS, ISI and Purdue Pharma are parties to a Distribution
Agreement dated June 14, 1991, as amended by Amendment dated January 26, 1994,
Amendment dated March 29, 1995 and Amendment dated the date hereof (the "Purdue
Pharma Agreement"); and
<PAGE>   2
          WHEREAS, the parties hereto desire to amend and restate the Agreement
subject to the provisions of Section 12(a) hereof;

          NOW, THEREFORE, in consideration of the mutual covenants herein
contained the parties agree as follows:

          1.  Definitions.  Except as otherwise defined herein, capitalized
terms used herein without definition shall have the same respective meanings as
provided in the MPCO Agreement and the Purdue Pharma Agreement.

          2.  Minimum Total Sales and Effective Date.

              (a)  Minimum Total Sales.

                   (i)  Notwithstanding the provisions of Section 2(b) of the
MPCO Agreement and the Purdue Pharma Agreement, so long as the aggregate amount
of Total Sales under the MPCO Agreement and the Purdue Pharma Agreement in any
two consecutive Annual Periods is equal to or greater than the aggregate amount
of Minimum Total Sales under the MPCO Agreement and the Purdue Pharma Agreement
for such Annual Periods, then (A) ISI shall not be entitled to give MPCO or
Purdue Pharma a Non-Exclusivity Notice, (B) each of MPCO and Purdue Pharma
shall remain exclusive distributors, and (C) neither MPCO nor Purdue Pharma
shall be required to make any payment to ISI pursuant to Section 2(b) of the
MPCO Agreement or the



                                       2

<PAGE>   3

Purdue Pharma Agreement, as the case may be.  For example, minimum Total Sales
under the Purdue Pharma Agreement for the second and third Annual Periods are
$900,000 and $1,350,000, respectively, and minimum Total Sales under the MPCO
Agreement for the second and third Annual Periods are $100,000 and $150,000,
respectively.  If Purdue Pharma's Total Sales for the second and third Annual
Periods are $600,000 and $1,000,000, respectively, and MPCO's Total Sales for
the second and third Annual Periods are $400,000 and $500,000, respectively,
then ISI shall not be entitled to give Purdue Pharma a Non-Exclusivity Notice,
Purdue Pharma shall remain an exclusive distributor and Purdue Pharma shall not
be required to make any payment to ISI pursuant to Section 2(b) of the Purdue
Pharma Agreement.

                   (ii)  The provisions of Section 2(b) of the MPCO Agreement
and the Purdue Pharma Agreement to the contrary notwithstanding, in the event
that ISI gives one or both of MPCO and Purdue Pharma a Non-Exclusivity Notice
in accordance with the provisions of Section 2(b) of the MPCO Agreement and/or
the Purdue Pharma Agreement, as the case may be, MPCO and Purdue Pharma shall
be required to pay the aggregate amount of $250,000 to ISI within the time
period set forth in said Section 2(b) or both MPCO and Purdue Pharma shall
become non-Exclusive Distributors of Products in their respective Territories.



                                       3
<PAGE>   4

              (b)  Effective Date for Returned Countries.  Notwithstanding the
definition of the "Effective Date" contained in Section 2(d) of the MPCO
Agreement, "Effective Date" shall mean for purposes of the MPCO Agreement the
Offering Completion Date (as defined in Section 11(a) below).

              (c)  3% Royalty.  Notwithstanding the provisions of Section 2(e)
of the MPCO Agreement, if Purdue Pharma and MPCO shall Opt-In, ISI shall pay
MPCO the Royalty at the rate of 3% until MPCO has received an aggregate royalty
of $5,000,000 and at the rate of 1% thereafter for the life of the Products.

          3.  Condition to Obligation to Purchase Vials.  Notwithstanding the
provisions of the first sentence of Section 4(e) of the Purdue Pharma
Agreement, with respect to the balance of the 45,000 Vials outstanding on the
date hereof due to be purchased by Purdue Pharma from ISI for $45 per Vial,
payable $35 upon delivery to Purdue Pharma and $10 upon sale by Purdue Pharma
(the "45,000 Vial Order"), the following provisions shall apply:  (a) with
respect to the 9,507 Vials remaining on the date hereof to be delivered to
Purdue Pharma from the 45,000 Vial Order, (i) Purdue Pharma shall pay ISI $25
per Vial out of the $45 per Vial purchase price upon delivery of the 9,507
Vials; provided, however, that ISI shall not



                                       4

<PAGE>   5

deliver any of the 9,507 Vials to Purdue Pharma during the month of August
1995, (ii) ISI shall add the balance of $20 per Vial remaining out of the $45
per Vial purchase price to the Cumulative Difference (as defined in the Purdue
Pharma Agreement), and (iii) Purdue Pharma shall have no obligation to pay the
balance of $20 per Vial remaining out of the $45 per Vial purchase price to
ISI, and (b) with respect to the 5,223 Vials held on the date hereof in Purdue
Pharma's inventory from the 45,000 Vial Order, at such time as such 5,223 Vials
are sold by Purdue Pharma, (i) ISI shall add $10 for each such Vial sold to the
Cumulative Difference and (ii) Purdue Pharma shall have no obligation to pay
$10 per Vial to ISI upon the sale of such 5,223 Vials.

          4.  Failure of ISI to Supply Products.  In the event that ISI is in
default under the MPCO Agreement of ISI's supply obligations for the Products
such that MPCO is entitled to exercise the remedies specified in Section 5 of
the MPCO Agreement, then Purdue Pharma shall also be entitled to exercise the
remedies specified in Section 5 of the Purdue Pharma Agreement notwithstanding
the fact that ISI is not in default under the Purdue Pharma Agreement of ISI's
supply obligations for the Products.  In the event that ISI is in default under
the Purdue Pharma Agreement of ISI's supply obligations for the



                                       5

<PAGE>   6

Products such that Purdue Pharma is entitled to exercise the remedies specified
in Section 5 of the Purdue Pharma Agreement, then MPCO shall also be entitled
to exercise the remedies specified in Section 5 of the MPCO Agreement
notwithstanding the fact that ISI is not in default under the MPCO Agreement of
ISI's supply obligations for the Products.

          5.  Price.

              (a)  The Base Price and the adjusted Base Price, as the case may
be, for the Preparation charged by ISI to each of MPCO and Purdue Pharma shall
at all times be the same.

              (b)  With respect to the provisions of Section 6(g) of the Purdue
Pharma Agreement, ISI, Purdue Pharma, MPCO, PF, Banela and Runham expressly
confirm and agree that (i) the consideration for the reduced price of $25 per
Vial is (A) The Purdue Frederick Company's ("PF") agreement to terminate on the
Offering Completion Date the Agreement dated January 26, 1994 between ISI and
PF, as amended by Amendment dated March 29, 1995 (the "PF Agreement"), (B)
Banela Corporation's ("Banela") and Runham Corporation's ("Runham") agreement
to terminate on the Offering Completion Date the Agreement dated January 26,
1994 between ISI and Banela and Runham, as amended by Amendment dated March 29,
1995 (the



                                       6

<PAGE>   7

"Stockholders' Agreement") and (C) MPCO's agreement that the Effective Date
shall be the Offering Completion Date and (ii) Purdue Pharma's cumulative
savings after the date hereof on its cost for Vials is intended to be
$2,529,133 (less the amount of any proceeds received by PF, Banela and Runham
for any sales of ISI Common Stock owned by them on the date hereof and any
amount paid by ISI to Purdue Pharma pursuant to Section 7(b)(ii)(A) or Section
8(a) hereof) which is the aggregate balance owed by ISI to PF under the PF
Agreement and to Banela and Runham under the Stockholders' Agreement on the
date hereof.  ISI, Purdue Pharma, MPCO, PF, Banela and Runham hereby further
expressly confirm and agree that a breach by ISI of any of its obligations
under the Purdue Pharma Agreement, the MPCO Agreement or this Agreement,
including, but not limited to, a breach by virtue of rejection under Section
365 of the Bankruptcy Code, (i) shall give rise to damages and losses suffered
by Purdue Pharma, MPCO, PF, Banela and Runham in an amount equal to $2,529,133
less the aggregate of (x) the Cumulative Difference plus (y) the aggregate
amount of any proceeds received by PF, Banela and Runham from any sales of ISI
Common Stock owned by them on the date hereof plus (z) any amount paid by ISI
to Purdue Pharma pursuant to Section 7(b)(ii)(A) or Section 8(a) hereof and
(ii) shall automatically terminate the prohibitions



                                       7

<PAGE>   8

contained in PF's, Banela's and Runham's letter agreements with ISI dated the
date hereof against the sale or other disposition by PF, Banela and Runham of
their respective shares of ISI Common Stock owned by them on the date hereof
without the consent of ISI during the period from the date hereof until
December 31, 1996, and from the date of any such breach or rejection PF, Banela
and Runham shall be free to sell or otherwise dispose of their respective
shares of ISI Common Stock owned by them on the date hereof without any
restriction by ISI.

          6.  Clinical Trials.

              (a)  Notwithstanding the provisions of Section 8(b) of the MPCO
Agreement and the Purdue Pharma Agreement, (i) the aggregate number of
monitoring visits to be conducted under both the MPCO Agreement and the Purdue
Pharma Agreement shall be two, (ii) the aggregate estimated cost of such
monitoring under both agreements is $100,000 and (iii) the aggregate amount of
ISI's reimbursement obligation under both agreements is $50,000.

              (b)  Notwithstanding the provisions of Section 8(c) of the MPCO
Agreement and the Purdue Pharma Agreement, (i) the aggregate grants under the
Current Clinical Studies under both the MPCO Agreement and the Purdue Pharma
Agreement do not exceed $1,050,000, and



                                       8

<PAGE>   9

(ii) the aggregate amount under both agreements of $317,695 has been paid prior
to the Amendment Date.

              (c)  Notwithstanding the provisions of Section 8(d) of the MPCO
Agreement and the Purdue Pharma Agreement, (i) only one of each of the studies
listed in said Section 8(d) shall be required under both the MPCO Agreement and
the Purdue Pharma Agreement and (ii) ISI shall pay for 50 percent of the costs
of such studies and MPCO and/or Purdue Pharma shall pay for the remaining 50
percent of such costs in accordance with the provisions of said Section 8(d).

              (d)  Notwithstanding the provisions of Section 8(e) of the MPCO
Agreement and the Purdue Pharma Agreement, ISI shall be responsible for the
payment of the aggregate amount of $15,000 under both the MPCO Agreement and
the Purdue Pharma Agreement for any claims made against MPCO and/or Purdue
Pharma.

          7.  Other Products.  Notwithstanding the provisions of Section 9 of
the MPCO Agreement and the Purdue Pharma Agreement:

              (a)  Neither MPCO nor Purdue Pharma shall be entitled to Opt-In
or exercise the New Product Option unless each of MPCO and Purdue Pharma
simultaneously Opts-In or exercises its New Product Option, as the case may be,
and simultaneously pays to ISI the applicable



                                       9

<PAGE>   10

Specified Percentage in accordance with the provisions of Section 9 of the MPCO
Agreement in the case of MPCO and the Purdue Pharma Agreement in the case of
Purdue Pharma; and

              (b)  Notwithstanding the provisions of Section 9 of the MPCO
Agreement and the Purdue Pharma Agreement, ISI shall not be entitled to
exercise its Buy-Out Option under Section 9(b)(iv) of the MPCO Agreement or the
Purdue Pharma Agreement unless (i) ISI simultaneously exercises its Buy-Out
Option under Section 9(b)(iv) of each of the MPCO Agreement and the Purdue
Pharma Agreement, and (ii) in the event that the aggregate of (x) the
Cumulative Difference plus (y) the aggregate amount of any proceeds received by
PF, Banela and Runham from any sales of ISI Common Stock owned by them on the
date hereof is less than $2,529,133, (A) ISI first pays the difference between
such aggregate and $2,529,133 to Purdue Pharma in immediately available funds,
and (B) in lieu of paying the aggregate Buy-Out Price to MPCO and Purdue
Pharma, ISI pays the balance of the aggregate Buy-Out Price remaining after the
payment specified in this Section 7(b)(ii)(A) 60% to MPCO and 40% to Purdue
Pharma, (C) ISI simultaneously pays all amounts due under this Section 7(b)(ii)
to MPCO and Purdue Pharma and (D) ISI agrees to pay each of MPCO and the Purdue
Pharma the contract price calculated pursuant to



                                       10

<PAGE>   11

Section 6(a) of the MPCO Agreement or the Purdue Pharma Agreement, as the case
may be, for any unsold Vials remaining in inventory three months after ISI's
exercise of the Buy-Out Option to the extent such Vials were purchased by or
delivered to MPCO or Purdue Pharma, as the case may be, after the date hereof
or (iii) in the event that the aggregate of (x) the Cumulative Difference plus
(y) the aggregate amount of any proceeds received by PF, Banela and Runham from
any sales of ISI Common Stock owned by them on the date hereof exceeds
$2,529,133, (A) in lieu of paying the aggregate Buy-Out Price to MPCO and
Purdue Pharma, ISI pays the balance of the aggregate Buy-Out Price remaining
after deduction of the excess amount described in this Section 7(b)(iii) 60% to
MPCO and 40% to Purdue Pharma, (B) ISI simultaneously pays all amounts due
under this Section 7(b)(iii) to MPCO and Purdue Pharma and (C) ISI agrees to
pay MPCO and Purdue Pharma the contract price calculated pursuant to Section
6(a) of the MPCO Agreement or the Purdue Pharma Agreement, as the case may be,
for any unsold Vials remaining in inventory three months after ISI's exercise
of the Buy-Out Option to the extent such Vials were purchased by or delivered
to MPCO or Purdue Pharma, as the case may be, after the date hereof.  In the
event that ISI exercises its Buy-Out Option under Section 9(b)(iv) of each of
the MPCO Agreement and the Purdue Pharma Agreement and satisfies



                                       11

<PAGE>   12

the conditions set forth in the preceding sentence, then PF, Banela and Runham
shall deliver to ISI the balance, if any, of their shares of ISI Common Stock
owned by them on the date hereof.  By way of example, if ISI desires to
exercise its Buy-Out Option under Section 9(b)(iv) of the Purdue Pharma
Agreement on November 15, 1995 at the Buy-Out Price of $10,000,000 and on such
date the Cumulative Difference is $129,133 and PF, Banela and Runham have not
sold any shares of ISI Common Stock owned by them on the date hereof, ISI shall
be required to make the following simultaneous payments:  (i) $2,400,000 to
Purdue Pharma, (ii) $4,560,000 to MPCO (being 60% of $7,600,000, the amount
remaining of the aggregate $10,000,000 Buy-Out Price after payment of the
amount specified in clause (i) of this sentence) and (iii) $3,040,000 to Purdue
Pharma (being 40% of $7,600,000, the amount remaining of the aggregate
$10,000,000 Buy-Out Price after payment of the amounts specified in clause (i)
of this sentence).  In addition, if on February 15, 1996 Purdue Pharma has an
inventory consisting of 10,000 Vials purchased after the date hereof and the
contract price for such Vials calculated pursuant to Section 6(a) of the Purdue
Pharma Agreement is $60 per Vial, and MPCO has no remaining inventory on such
date, ISI shall pay Purdue Pharma $600,000 for its remaining inventory of
10,000 Vials.



                                       12

<PAGE>   13

          8.  ISI's Option.  Notwithstanding the provisions of Section 19 of
the MPCO Agreement and Section 20 of the Purdue Pharma Agreement, ISI shall not
be entitled to exercise its option granted under said Sections during the
period commencing on the date hereof and ending on December 31, 1996 unless (a)
in the event that the aggregate of the Cumulative Difference plus the aggregate
amount of any proceeds received by PF, Banela and Runham from any sales of ISI
Common Stock owned by them on the date hereof is less than $2,529,133, ISI
first pays Purdue Pharma the difference between such aggregate and $2,529,133
in immediately available funds and (b) ISI simultaneously exercises its option
under Section 19 of the MPCO Agreement and Section 20 of the Purdue Pharma
Agreement, and (c) ISI simultaneously (i) issues the 350,000 Option Shares or
the 750,000 Option Shares, as the case may be, to MPCO, (ii) pays MPCO
$2,500,000 in immediately available funds; provided, however, that in the event
that the aggregate of (x) the Cumulative Difference plus (y) the aggregate
amount of any proceeds received by PF, Banela and Runham from any sales of ISI
Common Stock owned by them on the date hereof exceeds $2,529,133, then such
excess amount shall be credited towards ISI's required $2,500,000 payment to
MPCO, and (iii) pays all amounts due to Purdue Pharma under Section 20(b) of
the Purdue Pharma Agreement;



                                       13

<PAGE>   14

provided, however, that in the event that ISI elects pursuant to Section 20(b)
of the Purdue Pharma Agreement to have Purdue Pharma continue to market Alferon
N Injection for up to six months following the closing of the exercise of ISI's
option, then the provisions of this clause (iii) shall not apply, but in lieu
thereof ISI shall promptly purchase Purdue Pharma's Post-July 31, 1995
Inventory remaining at the end of such marketing period at the price specified
in Section 20(b) of the Purdue Pharma Agreement.  In the event that ISI
exercises its option pursuant to Section 19 of the MPCO Agreement and Section
20 of the Purdue Pharma Agreement and satisfies the conditions set forth in the
preceding sentence, then PF, Banela and Runham shall deliver to ISI the
balance, if any, of their shares of ISI Common Stock owned by them on the date
hereof.

          9.  Termination.

              (a)  MPCO may terminate the MPCO Agreement on 90-days' written
notice to ISI in the event of a material breach by ISI of any of the terms of
the Purdue Pharma Agreement unless during said 90-day period such breach is
cured, or best efforts have been made to begin to cure such breach and the
breach is then cured within a reasonable time thereafter.  Purdue Pharma may
terminate the Purdue Pharma Agreement on 90-days' written notice to



                                       14

<PAGE>   15

ISI in the event of a material default by ISI of any of the terms of the MPCO
Agreement unless during said 90-day period such breach is cured, or best
efforts have been made to begin to cure such breach and the breach is then
cured within a reasonable time thereafter.

              (b)  ISI may terminate the MPCO Agreement on 90-days' written
notice to MPCO in the event of a material breach by Purdue Pharma of any of the
terms of the Purdue Pharma Agreement unless during said 90-day period such
breach is cured, or best efforts have been made to begin to cure such breach
and the breach is then cured within a reasonable time thereafter.  ISI may
terminate the Purdue Pharma Agreement on 90-days' written notice to Purdue
Pharma in the event of a material default by MPCO of any of the terms of the
MPCO Agreement unless during said 90-day period such breach is cured, or best
efforts have been made to begin to cure such breach and the breach is then
cured within a reasonable time thereafter.

              (c)  The provisions of Section 15(c) of the MPCO Agreement and
Section 16(c) of the Purdue Pharma Agreement to the contrary notwithstanding,
in the event that ISI gives one or both of MPCO and Purdue Pharma a termination
notice in accordance with the provisions of Section 15(c) of the MPCO Agreement
and/or Section 16(c) of the Purdue Pharma Agreement, as the case may be, MPCO



                                       15

<PAGE>   16

and Purdue Pharma shall be required to pay the aggregate amount of $250,000 to
ISI within the time period set forth in said Section 15(c) of the MPCO
Agreement and/or Section 16(c) of the Purdue Pharma Agreement, as the case may
be, or both the MPCO Agreement and the Purdue Pharma Agreement shall terminate
within 60 days of the giving of such termination notice.

          10.  Remedies.  Each of the parties hereto shall be entitled to
assert under this Agreement, or under either one or both of the MPCO Agreement
and the Purdue Pharma Agreement to which it is a party, any remedy which it
would otherwise have been entitled to assert under such agreement if the
separate agreements contained in this Agreement, the MPCO Agreement and the
Purdue Pharma Agreement had been incorporated into one agreement.

          11.  MISCELLANEOUS.

               (A)  THIS AGREEMENT SHALL ONLY BE EFFECTIVE IF AND WHEN ISI
OBTAINS BETWEEN JULY 31, 1995 AND AUGUST 31, 1995 (THE "OFFERING COMPLETION
DATE") $7,800,000 OR MORE IN GROSS PROCEEDS TO ISI FROM ISI'S CURRENTLY
PROPOSED UNDERWRITTEN REGISTERED PUBLIC OFFERING OF SHARES OF ISI'S COMMON
STOCK.  ISI REPRESENTS AND WARRANTS TO, AND COVENANTS WITH, MPCO AND PURDUE
PHARMA THAT THE NET PROCEEDS OBTAINED BY ISI PURSUANT TO



                                       16

<PAGE>   17

THE PRECEDING SENTENCE WILL ONLY BE USED FOR THE FOLLOWING PURPOSES:  RESEARCH,
DEVELOPMENT AND CLINICAL TRIALS OF ISI'S PRODUCTS, REPAYMENT OF INDEBTEDNESS,
WORKING CAPITAL AND GENERAL CORPORATE PURPOSES; IT BEING UNDERSTOOD THAT ISI
SHALL ALLOCATE A PORTION OF SUCH PROCEEDS TO THE OPERATION OF ITS MANUFACTURING
FACILITY IN SUCH AMOUNT AS SHALL BE NEEDED TO ENABLE ISI TO CONTINUOUSLY SUPPLY
VIALS TO PURDUE PHARMA AND MPCO PURSUANT TO THE PROVISIONS OF THE PURDUE PHARMA
AGREEMENT AND THE MPCO AGREEMENT, RESPECTIVELY; AND, IT BEING FURTHER
UNDERSTOOD THAT ISI SHALL NOT REPAY MORE THAN $1,600,000 OF ITS INDEBTEDNESS
FROM THE PROCEEDS OF SUCH PUBLIC OFFERING PLUS ANY ADDITIONAL ADVANCES (NOT TO
EXCEED $500,000) INCURRED AFTER THE DATE HEREOF.  IF ISI FAILS TO OBTAIN
$7,800,000 OR MORE ON OR BEFORE THE OFFERING COMPLETION DATE, THIS AGREEMENT
SHALL BE NULL AND VOID, AND THE AMENDED AND RESTATED R S AGREEMENT, DATED
JANUARY 26, 1994, AMONG ISI, MPCO AND PURDUE PHARMA, AS AMENDED BY AMENDMENT
DATED MARCH 29, 1995, SHALL CONTINUE IN FULL FORCE AND EFFECT AS IF THIS
AGREEMENT HAD NEVER EXISTED.

               (b)  All notices and communications required or permitted by
this Agreement shall be in writing and shall be deemed to be duly given if
delivered or sent in accordance with the provisions of the MPCO



                                       17

<PAGE>   18

Agreement or the Purdue Pharma Agreement, as the case may be.

               (c)  This Agreement shall be governed and construed in
accordance with the laws of the State of New York, without giving effect to
principles of conflicts of law.

               (d)  This Agreement may be executed in counterparts each of
which when so executed and delivered shall constitute an original and all of
which together shall constitute one and the same instrument.

               (e)  This Agreement, the MPCO Agreement and the Purdue Pharma
Agreement contain the entire understanding and agreement among the parties
hereto with respect to the subject matter hereof, supersede all prior oral and
written understandings and agreements relating thereto, and may not be
modified, discharged, or terminated orally.

               (f)  Nothing herein contained shall be construed to constitute
the parties hereto as partners or as joint venturers, or any party as agent of
any other party.

               (g)  Any waiver by any party of a breach of any provision of
this Agreement shall not operate as or be construed to be a waiver of any other
breach of such provision or of any breach of any other provision of this
Agreement.  The failure of a party to insist upon



                                       18

<PAGE>   19

strict adherence to any term of this Agreement on one or more occasions shall
not be considered a waiver or deprive that party of the right thereafter to
insist upon strict adherence to that term or any other term of this Agreement.
Any waiver must be in writing.

               (h)  If any provision of this Agreement is invalid, illegal, or
unenforceable, the balance of this Agreement shall remain in effect, and if any
provision is inapplicable to any person or circumstance, it shall nevertheless
remain applicable to all other persons and circumstances.

               (i)  Each of the parties hereby irrevocably consents to the
jurisdiction of the courts of the State of New York and of any federal court
located in such State in connection with any action or proceeding arising out
of or relating to this Agreement or a breach of this Agreement.  In any such
action or proceeding, each of the parties waives personal service of any
summons, complaint, or other process and agrees that service thereof may be
made in accordance with Section 12(b).  Within 30 days after such service, or
such other time as may be mutually agreed upon in writing by the attorneys for
the parties to such action or proceedings, each of the parties shall appear or
answer such summons, complaint, or other process.  Should any of the parties so
served fail to appear or answer within



                                       19

<PAGE>   20

such 30-day period or such extended period, as the case may be, such party
shall be deemed in default and judgment may be entered by the other party
against such party for the amount as demanded in any summons, complaint, or
other process so served.

               (j)  None of the parties hereto shall assign this Agreement
without the prior written consent of the others; provided, however, that MPCO
and Purdue Pharma shall have the right to assign this Agreement to an Affiliate
or Affiliates without the prior written consent of ISI.

          IN WITNESS WHEREOF, the parties hereto have duly executed this
Amendment the day and year first above written.

                                        INTERFERON SCIENCES, INC.


                                        By______________________________
                                          Title:  Vice President


                                        MUNDIPHARMA PHARMACEUTICAL COMPANY


                                        By______________________________
                                          Title:  General Manager



                                       20

<PAGE>   21

                                        PURDUE PHARMA L.P.

                                        By:  Purdue Pharma Inc.,
                                             its general partner


                                        By______________________________
                                          Title:  Vice President


ACCEPTED AND AGREED:

THE PURDUE FREDERICK COMPANY


By______________________________
  Title:  Group Vice President



BANELA CORPORATION


By______________________________
  Title:  Director



RUNHAM CORPORATION


By______________________________
  Title:  Vice President



                                       21

<PAGE>   1
                                                                EXHIBIT 10.51
                                                                -------------


                        SETTLEMENT AGREEMENT

BETWEEN:

         AMARILLO CELL CULTURE COMPANY INCORPORATED, A Texas Corporation with
         its principal place of business at 800 W. 9th Avenue, Amarillo, Texas
         79101 (hereinafter called "ACC")

AND

         INTERFERON SCIENCES INC. with its principal place of business at 783
         Jersey Avenue, New Brunswick, New Jersey 08901 (hereinafter called
         "ISI")

AND

         PHARMA PACIFIC MANAGEMENT PTY. LTD. of 103-105 Pipe Road, Laverton,
         Victoria, Australia (hereinafter called "PPM")

AND

         PHARMA PACIFIC PTY. LTD. of 103-105 Pipe Road, Laverton, Victoria,
         Australia (hereinafter called "PPP")

AND

         PHARMA PACIFIC LTD., c/o 81 Carlton Gore Road, Newmarket, Auckland, New
         Zealand (hereinafter called "PPL")

AND

         FERNZ CORPORATION LIMITED, 81 Carlton Gore Road, Newmarket, Auckland,
         New Zealand

A.       Whereas ACC has entered into an agreement with ISI on 20th October
         1989, which provides, inter alia, that ACC grants to ISI licenses to
         use the Licensed Patents to make the Licensed Products in the
         Territory. ("The ACC/ISI Agreement")

B.       ACC has instituted proceedings against Fernz Corporation Limited, PPM,
         PPP and PPL (collectively referred to as "Fernz") alleging that Fernz
         has infringed ACC Patent No. 222457 ("the New Zealand Patent"). Fernz
         has counterclaimed by alleging, inter alia, that the New Zealand Patent
         is not valid. The proceedings are issued out of the High Court of New
         Zealand Auckland Registry being C.L. No. 52-93. ("the New Zealand
         Proceedings")
<PAGE>   2



C.       PPM has instituted opposition proceedings in Australia opposing the
         grant of Australian Patent Application No. 625431 (12227/88) in the
         name of Texas A & M University System. ("the Australian Proceedings")

D.       PPM has instituted opposition proceedings in Europe opposing the grant
         of ACC's European Patent, being Patent No. 0341258 ("the European
         Opposition Proceedings").

E.       Fernz denies the allegations of infringement.

F.       ACC denies that its New Zealand Patent is invalid.

G.       The parties wish to settle the Proceedings on the terms and conditions
         as set out hereafter.

H.       ACC and ISI have amended the ACC/ISI Agreement to transfer ISI rights
         to sublicense Licensed Patents back to ACC.

THE PARTIES AGREE AS FOLLOWS:

1.       ACC shall grant to PPM a non-exclusive sub-license of the Licensed
         Patents to make, have made, use and sell Licensed Products labeled for
         use only in human species in the Territory and for the Term as set out
         in the PPM/ACC Sub-License Agreement ("the Fernz License").

2.       In the event that there are residual rights in Licensed Patents held by
         ACC for which PPM would require a license to make, use and sell the
         Licensed Products in the Territory, then ACC covenants not to sue PPM
         in respect of those residual rights.

3.       Immediately upon this Settlement Agreement becoming effective in
         accordance with the provisions of clause 6 herein the parties shall by
         consent seek an order that the claims which each has made against the
         other in the New Zealand Proceedings be dismissed with no order as to
         costs. Each party shall bear its own costs of and incidental to the New
         Zealand proceedings.

4.       PPM shall discontinue its opposition to the Australian Proceedings.

         Each of the parties to the Australian Proceedings shall bear its own
         costs of and incidental to the Australian Proceedings.

5.       PPM shall discontinue its opposition to the European Opposition
         Proceedings. Each of the parties to the European Opposition Proceedings
         shall bear its own costs of and incidental to the European Opposition
         Proceedings.

                                       -2-
<PAGE>   3



6.       This Settlement Agreement shall become effective upon the execution of
         the Fernz License.

7.       ACC and ISI hereby release and forever discharge Fernz and all of its
         subsidiaries, related companies, affiliates, holding company,
         directors, servants, advisors, consultants and agents from and against
         any and all claims, demands, actions, proceedings, or costs whatsoever
         which ACC and ISI have or may have or, but for the execution of these
         terms of settlement, might otherwise have had before execution of these
         terms of settlement arising out of or in any way connected with:

         (i)     the New Zealand Proceedings;

         (ii)    the Australian Proceedings;

         (iii)   the European Opposition Proceedings; and

         (iv)    any conduct by Fernz or its subsidiaries, related companies,
                 affiliates, holding company, directors, servants, advisors,
                 consultants and agents in respect of the manufacture, use,
                 sale, distribution, or dealing in low dose oral interferon
                 tablets or formulations which infringe or allegedly infringe
                 the New Zealand Patent and any counterparts of the New Zealand
                 Patent in any jurisdiction in the world.

         It is understood that such release and discharge shall not apply to any
         breach or alleged breach of the terms of the Fernz License.

8.       Fernz hereby releases and forever discharges ACC and ISI and all of
         their subsidiaries, related companies, affiliates, holding company,
         directors, servants, advisors, consultants and agents from and against
         any and all claims, demands, actions, proceedings or costs whatsoever
         which Fernz has or may now have or, but for the execution of these
         terms of settlement, might otherwise have had before the execution of
         these terms of settlement arising out of or in any way connected with:

         (i)     the New Zealand Proceedings;

         (ii)    the Australian Proceedings; and

         (iii)   the European Opposition Proceedings.

                                   -3-


<PAGE>   4



9.       This Settlement Agreement shall be governed by and construed in
         accordance with the laws of New Zealand and all parties hereby submit
         to the exclusive jurisdiction of the courts of New Zealand.

DATED this _________ day of _____________________, 1995.

____________________________________________       Date:_____________________
Signed by:  Joseph M. Cummins, President
For and on behalf of AMARILLO CELL
CULTURE COMPANY, INCORPORATED


____________________________________________       Date:_____________________
Signed by: Larry Gordon, Vice President & 
General Counsel For and on behalf of
INTERFERON SCIENCES, INC.

____________________________________________       Date:_____________________
Signed by:
For and on behalf of PHARMA PACIFIC
MANAGEMENT PTY. LTD.

                                       -4-

<PAGE>   5



____________________________________________       Date:_____________________
Signed by:
For and on behalf of PHARMA PACIFIC PTY. LTD.

____________________________________________       Date:_____________________
Signed by:
For and on behalf of PHARMA PACIFIC LTD.

____________________________________________       Date:_____________________
Signed by:
For and on behalf of FERNZ CORPORATION LIMITED


                                      -5-

<PAGE>   1
                                                                EXHIBIT 10.52
                                                                -------------



                         PPM/ACC SUB-LICENSE AGREEMENT

BETWEEN:

        PHARMA PACIFIC MANAGEMENT PTY. LTD. of 103-105 Pipe Road, Laverton,
        Victoria, Australia (hereinafter called "PPM")

                                                               of the one part,

AND

        AMARILLO CELL CULTURE COMPANY INCORPORATED, A Texas Corporation 
        with its principal place of business at 800 W. 9th Avenue, Amarillo,
        Texas 79101 (hereinafter called "ACC")

                                                            of the second part

WHEREAS:

A.   Pursuant to an Agreement made the 20th day of October 1989 ACC granted to
     Interferon Sciences, Inc. ("ISI") a license pursuant to the Licensed
     Patents (as that term is therein defined) to make, have made, use and sell
     Licensed Products (as that term is therein defined), with the right to
     grant sub-licenses to third parties.

B.   ACC and ISI have amended that Agreement inter alia to transfer ISI's right
     to sublicense Licensed Patents back to ACC.

C.   ACC wishes to grant to PPM rights to use the Licensed Patents.


THIS AGREEMENT PROVIDES AS FOLLOWS:

1.   DEFINITIONS:

     "Affiliated Company" means any company, corporation, partnership or other
     business entity which is a subsidiary of PPM or of which PPM is a
     subsidiary, or which is a subsidiary of a company of which PPM is also a
     subsidiary or which otherwise controls or is under common control with PPM.
     In the case of a corporation or company "control" means ownership, either
     directly or indirectly of at least Fifty Percent (50%) of the shares of
     stock entitled to vote for the election of directors.



<PAGE>   2
     "Individual Patent" means any one or more of any continuation,
     continuations-in-part, divisions, reissues or extensions, each foreign
     counterpart and any patent application or any patent comprising the
     Licensed Patents.

     "Licensed Patent" means those United States Patents and patent applications
     listed in Schedule 1 and any continuations, continuations-in-part,
     divisions, reissues or extensions thereof, and each foreign counterpart of
     each United States Patents and patents and patent applications listed in
     Schedule 1 and any extensions thereof.

     "Licensed Product" means dose formulations or compositions comprising human
     interferon designated, detailed or labelled for use in humans, including
     human interferon produced using recombinant DNA technology but excluding
     interferon-alpha secreted by normal non-transformed human leukocytes in
     response to viral induction.

     "Net Sales Value" means the arms length gross selling price paid to PPM or
     its Affiliate Company or agents for Relevant Licensed Products exclusive of
     documented costs of packaging materials, charges for freight, insurance,
     taxes, and exclusive of customary discounts, refunds, credits, rebates and
     the like. In the case of a sale by PPM to an Affiliated Company royalties
     shall be calculated on the price which would be charged if the transaction
     were an arms length transaction with an unrelated company. Best evidence of
     such price shall be the average price actually charged by PPM or any
     Affiliated Company to any unrelated third parties in the then most recent
     sales of Relevant Licensed Products.

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

     "Relevant Licensed Product" means a product the manufacture, use or sale of
     which would constitute an infringement of the Licensed Patent without the
     license or consent of the proprietor of the Licensed Patent (or any other
     relevant licensor or party having the right to grant a license).

2.   LICENSE GRANT

     ACC hereby grants to PPM, a royalty bearing non-exclusive sublicense under 
     the Licensed Patents to make, have made, use and sell Licensed Products
     labeled for use only in human species in the Territory.


3.   RESEARCH AND PATENT REIMBURSEMENT

     In consideration of the grant of the license contained herein, PPM shall,
     within 48 hours of PPM's receipt and execution of a facsimile copy of this
     Agreement executed by ACC and the Settlement Agreement executed by ACC and
     ISI and PPM's receipt of a facsimile copy of the amendment to the ACC/ISI
     License Agreement executed

                                      -2-<PAGE>   3
          by ACC and ISI, pay by wire transfer to ACC the sum of US $500,000.00
          toward reimbursement of ACC for research and expenses incurred in
          connection with Licensed Patents.

     4.   ROYALTY

          PPM shall pay to ACC royalties as follows:

          (i)    A 10% royalty on sales of Relevant Licensed Products sold
                 within or sold and intended by PPM for use within the United
                 States of America.

          (ii)   A 7.5% royalty on sales of Relevant Licensed Products sold 
                 within or sold and intended by PPM for use within those 
                 countries other than the United States of America in which 
                 Individual Patents are currently in force and for so long as
                 they remain in force.

          (iii)  No royalties in those countries other than those described in 
                 clause 4(i) and 4(ii) above in which ACC does not hold a 
                 Licensed Patent.

          The obligation to pay a royalty shall be imposed only once on each
          Relevant Licensed Product when sold within or sold and intended by
          PPM for use within the countries referred to in clause 4(i) and 4(ii)
          regardless of the number of Licensed Patents embracing the Relevant 
          Licensed Product for the manufacture, use or sale of such Relevant 
          Licensed Product and regardless of intervening sales between PPM and
          any Affiliated Company.

          Royalties shall be calculated on Net Sales Value.

     5.   LICENSE FEE

          PPM shall also pay to ACC by wire transfer a license fee in the sum 
          of US $50,000.00 which fee shall be deducted from the first royalty 
          payments due by PPM to ACC pursuant to clause 4 herein in respect of
          sales of Relevant Licensed Products.

     6.   MANUFACTURE

          In consideration of the payment of the sums set out in clauses 3 and
          5 and the royalties on sales set out in clauses 4(i) and 4(ii), PPM 
          shall be entitled to manufacture Licensed Products in New Zealand or
          elsewhere in the Territory without having to pay any additional 
          monies for such manufacture to ACC. PPM shall be entitled to carry 
          out the manufacture, sale and distribution of the Licensed Products 
          itself or engage agents, distributors or other third parties to do so.

                                      -3-
      
<PAGE>   4

7.      TERM

        This Agreement shall remain in effect until one day before the date of
        the last to expire of the Licensed Patents unless terminated in
        accordance with the provisions of this Agreement. Where one or more 
        patents comprising the Licensed Patents expires on different due dates
        in different countries, the Relevant Licensed Products sold shall not
        bear royalties unless, at the time of sale of the Relevant Licensed
        Products in, or intended by PPM for use in, a country, the Licensed
        Patents in that country are still in force.

8.      WARRANTIES

        ACC covenants, agrees and warrants to PPM that:

    (i)    The Licensed Patents are believed to be valid. For the purpose of 
           this Agreement, a Licensed Patent, when granted, shall be presumed
           valid unless held invalid by a court of competent jurisdiction.

    (ii)   No third parties' patents or other rights will be infringed by PPM's 
           licensed activities pursuant to this Agreement provided that the
           elements of such activities that are alleged to provide basis for a
           claim of infringement are specifically described in a Licensed
           Patent, and provided further that ACC makes no warranty regarding
           noninfringement of Hoffmann-LaRoche U.S. Patent No. 4,503,035 or any 
           counterparts thereof.

    (iii)  ACC has the capacity to enter into this Agreement and to grant the 
           rights and licenses granted herein to the extent they are consistent 
           with the rights held by ACC under the relevant agreements 
           identified in subclause (v) below.

    (iv)   ACC has not granted any rights to third parties in respect of the 
           Licensed Patents regarding use of interferon in humans, except for 
           grants by ACC to ISI and to Hayashibara Biochemical Laboratories,
           Inc. ("HBL") of rights in Japan.

    (v)    ACC shall not grant any rights or licenses to any third parties
           inconsistent with the grant of rights to PPM hereunder.

    (vi)   The only relevant agreements governing the rights and licenses 
           in respect of the Licensed Patents currently in effect are 
           the agreements referred to in Recital A, an agreement dated 
           13 March 1992 granting to HBL rights to make, use or sell
           interferon-containing products in Japan, ACC's license agreement
           with Texas A&M University System ("TAMUS") dated 22 March 1988 and 
           the related Patent Assignment dated 21 April 1994 by TAMUS to ACC
           of New Zealand Patent No. 222,457.

                                     -4-
<PAGE>   5
    (vii) ACC shall make all royalty, and other payments due under, and
          shall not breach any of the terms of, nor shall it surrender the
          license granted to it under, the Agreement made between TAMUS and
          ACC on 22 March 1988.     

 9. INFORMATION:

    ACC shall keep PPM advised of any patents, continuations,
    continuations-in-part, divisions, reissues or extensions, re-examination
    requests, notices of opposition, applications for revocation, progress of
    applications for opposition or revocation, cessation or expiry of patents in
    a timely manner in respect of the Licensed Patents. PPM shall keep all such
    information confidential.

10. ACCOUNTS AND PAYMENT

    PPM shall within 45 days after the end of each calendar quarter provide ACC
    with a report of sales of the Relevant Licensed Products and the amounts due
    for royalties. The report shall provide sufficient information from which to
    calculate the amount of royalties payable including the total quantity and
    Net Sales Value of all Relevant Licensed Product sold during the preceding
    calendar quarter and the amounts payable to ACC. A statement shall also be
    submitted even where no amounts are payable to ACC. PPM shall at the same
    time remit to ACC the amount due.

11. CURRENCY

    All royalties and other payments due shall be made in U.S. dollars in the
    United States. Where sales are made in countries outside the United States,
    royalties shall accrue in the currency in which the sales are made and
    royalties shall be payable to ACC in U.S. dollars at the official rate of
    exchange prevailing on the 20th day following the conclusion of each
    calendar quarter.

12. BOOKS AND RECORDS

    PPM shall keep proper books of accounts which clearly indicate the volume of
    sales and all other financial data and documentation necessary for
    calculation of the Net Sales Value of the Relevant Licensed Products and the
    amounts due in respect of royalties. PPM shall also require its Affiliate
    Companies and its agents to keep books of accounts and manufacturing and
    shipping records and to make periodic reports of same to PPM as necessary
    and appropriate to enable PPM to calculate the amounts due in respect of
    royalties.

    ACC may nominate an independent public accountant, acceptable to and
    approved by PPM (which approval shall not be unreasonably withheld), once in
    each calendar 

                                      -5-


   <PAGE>   6
     year, to inspect the books of account of PPM and other records and reports
     deemed reasonably necessary for inspection by said accountant during
     reasonable business hours for the purpose of verifying the accuracy of the
     reports and payments made by PPM during the preceding calendar year. Such
     accountant shall not disclose any information related to PPM's financial
     matters but shall certify to ACC the accuracy of the reports and payments
     made by PPM in accordance with this Agreement. All fees charged by such
     accountant shall be paid by ACC except if there are discrepancies in PPM's
     quarterly reports which result in under reporting or under payment by a
     factor greater than 10% of the amount due. In such instance PPM shall
     reimburse ACC for the accountant's costs other than as required by law. ACC
     shall not make any public disclosure of the PPM reports or royalty rates
     referred to in this agreement. To the extent disclosure of such information
     to a third party is required in the ordinary course of ACC's business, such
     disclosure shall be made subject to the recipient's agreement to hold such
     information in confidence.
 
13.  PATENT VALIDITY

     If an Individual Patent in any country comprising the Territory, shall in
     any action for infringement or proceeding for revocation or re-examination
     be declared to be invalid on any ground whatsoever, all royalties payable
     in respect of sales of Relevant Licensed Products solely under that
     Individual Patent (and not under any other Individual Patent) in or
     intended for use in that country shall, as from the date of any final order
     or declaration of invalidity, cease to be payable.

     From the commencement of any such action or proceeding, PPM shall pay
     royalties accruing in the relevant country into an interest bearing escrow
     account in the joint names of ACC and PPM, established by ACC and approved
     by PPM, until such time as the matter is resolved or a court of appropriate
     authority finally determines the validity or otherwise of the Individual
     Patent. If the Individual Patent is held invalid and the court's decision
     is not or cannot be appealed, the royalties paid into escrow shall be
     refunded to PPM with accrued interest; otherwise the royalties paid into
     escrow shall be paid to ACC with accrued interest. 

14.  ASSIGNMENT

     Any assignment by ACC of rights in Licensed Patents shall be subject to the
     ACC Agreement with ISI dated 20th October 1989 and as amended the 27th day
     of April, 1995, prior grants by ACC to HBL of rights in Japan, and this
     sublicense agreement.

15.  SUB-LICENSES

     PPM shall not have the right to grant Sub-Licenses under the License
     granted to it, provided, however, that PPM shall have the right to contract
     with an Affiliated 


                                     -6-
<PAGE>   7

     Company or an agent to manufacture, to distribute or to sell Licensed
     Products on behalf of PPM under this Agreement.

16.  SCOPE OF RIGHTS GRANTED

     PPM has reviewed ACC's pre-existing relevant license agreement with Texas A
     & M University System dated 22 March 1988, and the agreement with ISI dated
     20 October 1989 and as amended on the 27th day of April, 1995, and PPM
     acknowledges its understanding that ACC/ISI cannot grant any rights to PPM
     beyond those or inconsistent with those now held by ACC under those
     pre-existing agreements. PPM and ACC agree that the terms and scope of
     rights granted hereunder shall be interpreted accordingly.

17.  PATENT FEES

     ACC shall pay all renewal and other fees necessary to keep the Licensed
     Patents in force and valid.

18.  INFRINGEMENT

     Each of the parties to this Agreement shall immediately give notice in
     writing to the other parties of any infringement or threatened infringement
     of any of the Licensed Patents which at any time comes to its knowledge.

     Where an infringement of any Individual Patent occurs by a third party in a
     country where PPM or an Affiliated Company or agent is selling Relevant
     Licensed Products for use in that country then ACC and PPM agree to meet
     and negotiate to define the most practical business and economically
     feasible strategy for action to address the matter. Facts pertinent to such
     discussions shall include, but are not limited to, whether or not the third
     party infringing product is regulation compliant, and the extent of
     negative impact sales of such product has had or reasonably will have on
     the market for the Relevant Licensed Product in the country.

     ACC or ACC's licensor shall have the option, at their own expense, to
     institute proceedings for infringement. If the alleged infringing product
     is not regulation compliant, ACC shall take reasonable steps to stop such
     regulation noncompliant activity by request or petition to the relevant
     policing regulatory agency. If the infringing product is being sold by a
     third party in compliance with applicable drug regulations, PPM can request
     that ACC bring an infringement action against that third party at the
     equally shared cost of PPM and ACC. If ACC institutes such infringement
     action, royalties payable by PPM in the country of infringement shall be
     paid into escrow in accordance with the provisions of clause 13 herein; PPM
     and ACC shall be entitled to recover their share of the costs from any
     damages awarded in such action; and any settlement shall be with the
     consent of PPM which shall not


                                      -7-<PAGE>   8
        be unreasonably withheld. If ACC does not institute such action within
        ninety (90) days of PPM's written request, PPM's obligation to pay
        royalties on sale of Relevant Licensed Products in the country of
        infringement shall be suspended for the duration of the infringing
        activity. 

        In the event that proceedings are instituted by any third party against
        PPM for infringement of any of the Licensed Patents, then ACC shall
        indemnify PPM in respect of all costs, claims, demands, proceedings or
        liabilities (including all legal fees) made or incurred by PPM as a
        consequence of defending such infringement proceedings.

19.     APPLICATIONS FOR REGULATORY APPROVAL OF LICENSED PRODUCTS

        PPM shall use its best efforts to assure that its licensed activities
        hereunder shall be compliant with all applicable laws, regulations and
        rules in the country in the Territory where such activities are or will
        be conducted. With each quarterly statement from PPM to ACC under clause
        10 above, PPM shall advise ACC of all applications for regulatory
        approval of manufacture or use or sale of Licensed Products hereunder
        which are pending, made, withdrawn or granted in countries where there
        exists an Individual Patent. PPM shall also provide ACC with copies of
        any advertising, package inserts, clinical reports and the like intended
        for public dissemination detailing the claims of therapeutic efficacy
        made or to be made by PPM or its Affiliates for Licensed Products in
        each country where Licensed Products are to be distributed for sale. To
        the extent such information is not otherwise available to the public ACC
        shall hold such information in confidence and not disclose it to any
        third party. 

20.     GRANT OF RESIDUAL RIGHT

        In the event that for whatever reason, any residual rights in Licensed
        Patents reside in ACC, which cannot or have not been granted to PPM
        pursuant to this Agreement, which PPM might require in order to make,
        use and sell the Licensed Products in the Territory, then ACC hereby
        covenants not to sue PPM on the basis of said residual rights in
        Licensed Patents.

21.     PURCHASE OF ISI STOCK

        PPM agrees to purchase stock in ISI to the value of US $125,000.00 by
        wire transfer within 48 hours of PPM's receipt and execution of a
        facsimile copy of this Agreement executed by ACC and the Settlement
        Agreement executed by ACC and ISI and PPM's receipt of a facsimile copy
        of the amendment to the ACC/ISI License Agreement executed by ACC and
        ISI. The per share stock price shall be Two Dollars (U.S. $2.00) per
        share. 


                                      -8-<PAGE>   9

        The issue and sale of the ISI Common Stock to PPM has not been and will
        not be registered under the Securities Act  of 1933, as amended (the
        "Act"), in reliance upon the applicability of Section 4(2) of the Act
        to the transaction contemplated hereby. In furtherance of such
        reliance, certificates representing the ISI Common Stock will bear a
        restrictive legend to the effect that the ISI Common Stock may not be 
        sold without registration under the Act, absent an available exemption
        from the registration provisions of the Act, and appropriate "stop
        transfer" instructions will be issued to the transfer agent for ISI
        Common Stock. PPM acknowledges that it has had access to such knowledge 
        about ISI as is customarily found in a registration statement filed
        under the Act, agrees that it is acquiring the ISI Common Stock for 
        investment and not with a view to distribution, and acknowledges that 
        ISI has no obligation to register the ISI Common Stock under the Act.
        In addition, PPM agrees that for a period of two years from the date
        hereof, it will not sell, pledge, hypothecate or otherwise transfer the 
        ISI Common Stock, without the express prior written consent of ISI.

22.     VENUE

        Should suit be brought by ACC under this Sub-License Agreement, venue 
        shall be in the State of Victoria, Australia; and if suit should be 
        brought by PPM under this Sub-License Agreement, venue shall be in the 
        State of Texas, USA.

23.     DISPUTE RESOLUTION

        Any dispute between ACC and PPM regarding whether or not a Licensed 
        Product is a relevant Licensed Product, thus requiring that PPM's sales
        of same are subject to payment of royalties under clause 4 shall be 
        resolved by decision of an Independent Patent Attorney ("IPA") 
        satisfactory to both PPM and ACC at their joint cost and expense. The 
        IPA shall be selected from patent attorneys in the country where ACC 
        contends that the Licensed Product(s) sold by PPM is a Relevant
        Licensed Product(s) under the terms of this agreement. The IPA shall 
        provide a reasoned decision based on brief/exhibits by ACC, response
        brief/exhibits by PPM and reply/exhibits (if any) by ACC. ACC and PPM
        agree to accept the decision of the IPA. If the IPA finds that the
        Licensed Product in dispute is a Relevant Licensed Product, PPM will 
        pay ACC all royalties due on sales of the Relevant Licensed Product 
        with the next account and payment to ACC under clause 10 hereof.

24.     TERMINATION

        This Agreement shall only be terminated by ACC as provided hereafter
        and not otherwise. In the event that PPM does not pay royalties
        properly due under this Agreement, as determined by an IPA under 
        clause 23 above, in any country comprising the Territory then PPM
        agrees to cease and desist its sales of the Relevant Licensed Product
        in that country and to submit to a voluntary injunction

                                     -9-
                  
<PAGE>   10
         against infringement in that country or shall make payment of all
         royalties then accrued and due in that country. If PPM is otherwise in
         default under this Agreement for non-payment of royalties in a country
         comprising the Territory, ACC shall forward to PPM a notice in writing
         specifying that PPM is in default in paying royalties with respect to
         such country and requiring PPM to rectify the default within 30 days.
         In the event PPM does not make the payment properly due in respect to
         such country within the 30 days then ACC shall be entitled to terminate
         the license in that country.

25.      NOTICES

         All notices that are required or authorized to be given under this
         Agreement shall be in writing and may be served by sending express air
         mail post, personal delivery or telex or facsimile to the registered
         office of the other party and shall be deemed to have been duly served
         in the case of such postage on the third business day after the date
         upon which the notice was properly addressed and so posted or in the
         case of personal delivery upon actual delivery or in the case of telex
         or facsimile when the error-free correct answer back code is received.


DATED this 27th day of April, 1995.


/s/ R. C. REIS
- -----------------------------------------
Signed by: Robert Reis, General Manager
For and on behalf of PHARMA PACIFIC
MANAGEMENT PTY. LTD.


/s/ JOSEPH M. CUMMINS
- -----------------------------------------
Signed by: Joseph M. Cummins, President
For and on behalf of AMARILLO CELL
CULTURE COMPANY, INCORPORATED



                                 -10-<PAGE>   11
                                   SCHEDULE 1

                        AMARILLO CELL CULTURE CO., INC.
                              800 WEST 9TH AVENUE
                           AMARILLO, TEXAS 79101 USA


1.      "METHOD OF REGULATING APPETITE AND EFFICIENCY OF FOOD UTILIZATION
        EMPLOYING INTERFERON" as described and claimed in United States Patent
        No. 4,497,795 issued February 5, 1985 in the USA. Also issued in
        Argentina, Australia, Canada, France, Italy, New Zealand, and South
        Africa. Pending in Germany.

2.      "METHOD OF USING INTERFERON IN LOW DOSAGE TO REGULATE APPETITE
        AND EFFICIENCY OF FOOD UTILIZATION" as described and claimed in United
        States Patent No. 4,820,515 issued April 11, 1989 in the USA. Also
        issued in Argentina, Australia, Canada, France, Italy, New Zealand, and
        south Africa. Pending in Germany.

3.      "LOW DOSAGE OF INTERFERON TO ENHANCE VACCINE EFFICIENCY" as
        described and claimed in United States Patent No. 4,820,514 issued April
        11, 1989 in the USA. Also issued in Australia, Austria, Belgium, France,
        Germany, United Kingdom, Italy, Luxembourg, Netherlands, New Zealand,
        Sweden and Switzerland.

4.      "TREATMENT OF IMMUNO-RESISTANT DISEASE" as described and claimed
        in United States Patent No. 5,019,382 issued May 28, 1991. Also issued
        in south Africa and New Zealand. Filed in Australia, Canada, Denmark,
        Ireland, Korea, Norway, the OAPI counties, and the European Patents
        Community (EPC).

5.      "METHOD FOR REDUCING SIDE EFFECTS OF CANCER THERAPY" as
        described and claimed in United States patent No. 5,017,371 issued May
        21, 1991. Also issued In Australia, Austria, Belgium, France, Germany,
        Hungary, Italy, Luxembourg, Netherlands, Sweden, Switzerland, and United
        Kingdom. Filed in Canada and Japan.


                                    -11-<PAGE>   12

6.   "METHOD FOR PREVENTION OF PARASITIC INFECTION" as described and claimed in 
     U.S. Patent No. 5,215,741 issued June 1, 1993 in the USA.

7.   "PHARMACEUTICAL COMPOSITION CONTAINING INTERFERON FOR BUCCAL 
     ADMINISTRATION" as described and claimed in European Patent No. 03431258,  
     issued March 2, 1994 in Austria, Belgium, France, Germany, Italy, 
     Luxembourg, Netherlands, Sweden, Switzerland, and United Kingdom. The 
     patents will expire November 6, 2007.



                                      -12-

<PAGE>   1
 
                                                                EXHIBIT 23.1
                                                                ------------

                        CONSENT OF INDEPENDENT AUDITORS
 
The Board of Directors
Interferon Sciences, Inc.
 
We consent to the use of our report included herein and to the reference to our
firm under the heading "Experts" in the prospectus.
 
Our report dated April 3, 1995 contains an explanatory paragraph that states
that the Company has suffered recurring losses from operations and has an
accumulated deficit, which raise substantial doubt about its ability to continue
as a going concern. The consolidated financial statements do not include any
adjustments that might result from the outcome of this uncertainty.
 
                                          KPMG PEAT MARWICK LLP
 
New York, New York
   
July 28, 1995
    


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