<PAGE>
                              UNITED STATES
                    SECURITIES AND EXCHANGE COMMISSION
                          Washington, D.C. 20549

                                Form 10-Q

         (Mark One)
(X)      QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
         EXCHANGE ACT OF 1934

         For the quarterly period ended   March 31, 1998
                                       --------------------   ------------
     
                                    OR

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

         For the transition period from ____________ to ___________

         Commission File Number     0-19034
                                --------------

                     REGENERON PHARMACEUTICALS, INC.
        ---------------------------------------------------------
          (Exact name of registrant as specified in its charter)

                New York                              13-3444607
    ---------------------------------    -------------------------------------
     (State or other jurisdiction of      (I.R.S. Employer Identification No.)
     incorporation or organization)

        777 Old Saw Mill River Road
             Tarrytown, New York                            10591-6707
    ----------------------------------------              --------------
    (Address of principal executive offices)                (Zip code)

                              (914) 347-7000
           ----------------------------------------------------
           (Registrant's telephone number, including area code)


Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange
Act of 1934 during the preceding 12 months (or for such shorter period
that the registrant was required to file such reports), and (2) has been
subject to such filing requirements for the past 90 days.

                                                           Yes X    No
                                                              ----     ----

Indicate the number of shares outstanding of each of the issuer's classes
of common stock as of May 8, 1998:


         Class of Common Stock              Number of Shares
     -------------------------------        ------------------
     Class A Stock, $0.001 par value           27,110,100
     Common Stock, $0.001 par value             3,896,274


<PAGE>

                       REGENERON PHARMACEUTICALS, INC.
                              Table of Contents
                                March 31, 1998



                                                                    Page Numbers



PART I     FINANCIAL INFORMATION



Item 1     Financial Statements

           Condensed balance sheets (unaudited) at March 31, 1998
           and December 31, 1997                                          3

           Condensed statements of operations (unaudited) for the three
           months ended March 31, 1998 and 1997                           4

           Condensed statement of stockholders' equity (unaudited) for
           three months ended March 31, 1998                              5

           Condensed statements of cash flows (unaudited) for the
           three months ended March 31, 1998 and 1997                     6

           Notes to condensed financial statements                        7-9


Item 2     Management's Discussion and Analysis of  Financial Condition
           and Results of Operations                                      10-17



PART II    OTHER INFORMATION


Item 6     Exhibits and Reports on Form 8-K                               18

SIGNATURE PAGE                                                            19


Exhibit 27        Financial data schedule



                                    2


<PAGE>


PART I.  FINANCIAL INFORMATION

ITEM 1.   FINANCIAL STATEMENTS

REGENERON PHARMACEUTICALS, INC.
CONDENSED BALANCE SHEETS AT MARCH 31, 1998 AND DECEMBER 31, 1997
(Unaudited) (In thousands, except share data)


<TABLE>
<CAPTION>
                                                                                            March 31,             December 31,
                                                   ASSETS                                     1998                    1997
                                                                                              ----                    ----
<S>                                                                                     <C>                      <C>    
Current assets
    Cash and cash equivalents                                                                   $19,258                  $28,921
    Marketable securities                                                                        65,813                   63,602
    Receivable due from The Procter & Gamble Company                                              2,306                    2,403
    Receivable due from Merck & Co., Inc.                                                         1,896                    1,707
    Receivable due from Amgen-Regeneron Partners                                                    429                      356
    Receivable due from Sumitomo Pharmaceuticals Company, Ltd.                                                             2,115
    Prepaid expenses and other current assets                                                     1,204                      536
                                                                                         ---------------         ----------------
       Total current assets                                                                      90,906                   99,640

Marketable securities                                                                            37,401                   35,518
Investment in Amgen-Regeneron Partners                                                              707                      364
Property, plant and equipment, at cost, net of accumulated depreciation
    and amortization                                                                             32,200                   32,713
Other assets                                                                                        218                      145
                                                                                         ---------------         ----------------
       Total assets                                                                            $161,432                 $168,380
                                                                                         ===============         ================

                                    LIABILITIES and STOCKHOLDERS' EQUITY
Current liabilities
    Accounts payable and accrued expenses                                                        $3,683                   $4,663
    Capital lease obligations, current portion                                                    1,284                    1,770
    Note payable, current portion                                                                    73                       73
    Deferred revenue, current portion                                                             2,431                    4,182
                                                                                         ---------------         ----------------
       Total current liabilities                                                                  7,471                   10,688

Capital lease obligations                                                                         1,813                    2,077
Note payable                                                                                      1,658                    1,675
Other liabilities                                                                                   252                      242

Deferred revenue                                                                                 14,802                   14,801

Commitments and contingencies

Stockholders' equity
    Preferred stock, $.01 par value; 30,000,000 shares authorized; issued

    and outstanding - none 
    Class A Stock, convertible, $.001 par value;
    40,000,000 shares authorized;
         4,024,870 shares issued and outstanding in 1998
         4,117,540 shares issued and outstanding in 1997                                              4                        4
   Common Stock, $.001 par value; 60,000,000 shares authorized;
        26,968,234 shares issued and outstanding in 1998
        26,804,941 shares issued and outstanding in 1997                                             27                       27
    Additional paid-in capital                                                                  308,426                  308,109
    Unearned compensation                                                                          (630)                    (720)
    Accumulated deficit                                                                        (172,437)                (168,608)
    Accumulated other comprehensive income                                                           46                       85
                                                                                         ---------------         ----------------
       Total stockholders' equity                                                               135,436                  138,897
                                                                                         ---------------         ----------------
       Total liabilities and stockholders' equity                                              $161,432                 $168,380
                                                                                         ===============         ================

</TABLE>



The accompanying notes are an integral part of the financial statements.

                                      3


<PAGE>

REGENERON PHARMACEUTICALS, INC.
CONDENSED STATEMENTS OF OPERATIONS (Unaudited)
(In thousands, except per share data)


                                                 Three months ended March 31,
                                              1998                        1997
                                              ----                        ----

Revenues
      Contract research and development      $4,574                      $4,238
      Contract manufacturing                  1,886                         696
      Investment income                       1,790                       1,279
                                              -----                       -----
                                              8,250                       6,213
                                              -----                       -----


Expenses
      Research and development                8,150                       7,076
      Loss in Amgen-Regeneron Partners          687                       1,700
      General and administrative              1,384                       1,464
      Depreciation and amortization             869                       1,201
      Contract manufacturing                    868                         493
      Interest                                  121                         208
                                             ------                      ------
                                             12,079                      12,142
                                             ------                      ------
Net loss                                    ($3,829)                    ($5,929)
                                            ========                    ========
Net loss per share, basic and diluted        ($0.12)                     ($0.23)
                                             =======                     =======

   The accompanying notes are an integral part of the financial statements.

                                      4


<PAGE>

REGENERON PHARMACEUTICALS, INC.
CONDENSED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited)
For the three months ended March  31, 1998
(In thousands)


<TABLE>
<CAPTION>
                                                                                                         Additional
                                                                                                          Paid-in
                                                   Class A Stock                  Common Stock             Capital
                                                   -------------                  ------------            ----------
                                                Shares        Amount         Shares          Amount       
                                                ------        ------         ------          ------
<S>                                         <C>             <C>           <C>             <C>            <C>                     

     Balance, December 31, 1997                  4,118        $    4         26,805         $    27        $308,109
                                        
Amortization of unearned compensation   
Issuance of Common Stock in connection  
     with exercise of stock options                                              71                             317
Conversion of Class A Stock to          
     Common Stock                                  (93)                          93
Net loss                                
Change in net unrealized gain           
     on marketable securities           
                                        
                                                ------        -------        ------         -------        --------
     Balance, March 31, 1998                     4,025        $     4        26,969         $    27        $308,426
                                                ======        =======        ======         =======        ========
</TABLE>



<TABLE>
<CAPTION>
                                                                         Accumulated         Total
                                         Unearned      Accumulated   Other Comprehensive  Stockholders'    Comprehensive
                                       Compensation      Deficit            Income           Equity             Loss
                                       ------------    -----------   -------------------  ------------     -------------
<S>                                    <C>             <C>           <C>                  <C>              <C>
     Balance, December 31, 1997             ($720)       ($168,608)       $      85        $ 138,897
                                        

Amortization of unearned compensation          90                                                 90
Issuance of Common Stock in connection  
Conversion of Class A Stock to
     with exercise of stock options                                                              317        
     Common Stock                             
Net loss                                                    (3,829)                           (3,829)      ($  3,829)
Change in net unrealized gain                               
     on marketable securities                                                   (39)             (39)            (39)

                                            ------       ----------       ---------        ---------       ---------
     Balance, March 31, 1998                ($630)       ($172,437)       $      46        $ 135,436       ($  3,868)
                                            ======       ==========       =========        =========       =========

</TABLE>

                       
   The accompanying notes are an integral part of the financial statements.

                                      5


<PAGE>

REGENERON PHARMACEUTICALS, INC.
CONDENSED STATEMENTS OF CASH FLOWS (Unaudited)
Increase (Decrease) in Cash and Cash Equivalents
(In thousands)


<TABLE>
<CAPTION>
                                                                                           Three months ended March 31,
                                                                                           1998                     1997
                                                                                           ----                     ----

Cash flows from operating activities
   Net loss                                                                              ($3,829)                 ($5,929)
                                                                                         --------                 --------
   Adjustments to reconcile net loss to net cash
     used in operating activities
      Loss in Amgen-Regeneron Partners                                                       687                    1,700
      Depreciation and amortization                                                          869                    1,201
      Stock issued in consideration for services rendered                                     90                       90
      Changes in assets and liabilities
        Decrease in amounts due from The Procter & Gamble Company                             97
        Decrease  in amounts due from Sumitomo Pharmaceuticals Co., Ltd.                   2,115
        (Increase) decrease in amounts due from Merck & Co., Ltd.                           (189)                   1,022
        Increase in amounts due from Amgen-Regeneron Partners                                (73)
        Increase in investment in Amgen-Regeneron Partners                                (1,030)                      (9)
        (Increase) decrease in prepaid expenses and other assets                            (741)                      85
        Decrease in deferred revenue                                                      (1,750)                  (1,280)
        Decrease in accounts payable, accrued expenses,
          and other liabilities                                                             (452)                    (240)
                                                                                          -------                  -------
                 Total adjustments                                                          (377)                   2,569
                                                                                          -------                  -------
          Net cash used in operating activities                                           (4,206)                  (3,360)
                                                                                          -------                  -------
<S>                                                                                     <C>                      <C>
Cash flows from investing activities
   Purchases of marketable securities                                                    (26,475)                 (20,562)
   Sales of marketable securities                                                         22,342                   19,593
   Capital expenditures                                                                     (874)                  (1,184)
                                                                                         --------                 --------
          Net cash used in investing activities                                           (5,007)                  (2,153)
                                                                                         --------                 --------


Cash flows from financing activities
   Net proceeds from the issuance of stock                                                   317                      107
   Principal payments on note payable                                                        (17)                     (19)
   Capital lease payments                                                                   (750)                  (1,136)
                                                                                         --------                 --------
          Net cash used in financing activities                                             (450)                  (1,048)
                                                                                         --------                 --------

          Net decrease in cash and cash equivalents                                       (9,663)                  (6,561)
                                                                                         --------                 --------

Cash and cash equivalents at beginning of period                                          28,921                   34,475
                                                                                         -------                  -------

          Cash and cash equivalents at end of period                                     $19,258                  $27,914
                                                                                         =======                  =======
</TABLE>


   The accompanying notes are an integral part of the financial statements.

                                      6


<PAGE>

REGENERON PHARMACEUTICALS, INC.

Notes to Condensed Financial Statements
(In thousands, except per share data)


1.       Interim Financial Statements

         The interim Condensed Financial Statements of Regeneron
         Pharmaceuticals, Inc. (the "Company") have been prepared in accordance
         with the instructions to Form 10-Q and Article 10 of Regulation S-X.
         Accordingly, they do not include all information and disclosures
         necessary for a presentation of the Company's financial position,
         results of operations and cash flows in conformity with generally
         accepted accounting principles. In the opinion of management, these
         financial statements reflect all adjustments, consisting only of normal
         recurring accruals, necessary for a fair presentation of the Company's
         financial position, results of operation, and cash flows for such
         periods. The results of operations for any interim periods are not
         necessarily indicative of the results for the full year. These
         financial statements should be read in conjunction with the financial
         statements and notes thereto contained in the Company's Annual Report
         on Form 10-K for the year ended December 31, 1997.


2.       Statement of Cash Flows

         Supplemental disclosure of noncash investing and financing
         activities:

         Capital lease obligations of $250 were incurred during the first
         three months of 1997, when the Company leased new equipment. No
         such obligations were incurred for the three months ended March
         31, 1998.

         Included in accounts payable and accrued expenses at March 31,
         1998 and December 31, 1997 were approximately $117 and $635 of
         capital expenditures, respectively. Included in accounts payable
         and accrued expenses at March 31, 1997 and December 31, 1996
         were approximately $104 and $800, respectively, of accrued
         capital expenditures.


3.       Accounts Payable and Accrued Expenses

         Accounts payable and accrued expenses as of March 31, 1998 and 
         December 31, 1997 consist of the following:

                                        March 31,   December 31,
                                          1998         1997
                                        ---------   ------------
Accounts payable                        $1,763       $2,947       

Accrued payroll and related costs          973          654          
Accrued clinical trial expense             320          320          
Accrued expenses, other                    350          392
Deferred compensation                      277          350
                                        ------       ------
                                        $3,683       $4,663
                                        ======       ======

                                      7


<PAGE>


REGENERON PHARMACEUTICALS, INC.
Notes to Condensed Financial Statements
(In thousands, except per share data)


4.       Net Loss per Share

         The Company's basic net loss per share amounts have been
         computed by dividing net loss by the weighted average number of
         Common and Class A shares outstanding. For the three months
         ended March 31, 1998 and 1997, the Company reported net losses
         and, therefore, no common stock equivalents were included in the
         computation of diluted net loss per share since such inclusion
         would have been antidilutive. The calculations of basic and
         diluted net loss per share are as follows:

                     Net Loss          Shares      Per Share
                    (Numerator)     (Denominator)   Amount
                    -----------     -------------   ------
1998:
      Basic and       ($3,829)        30,932       ($  0.12)
      Diluted

1997:
      Basic and       ($5,929)        25,799       ($  0.23)
      Diluted



         Options and warrants, which have been excluded from the diluted
         per share amounts because their effect would have been
         antidilutive, include the following:


<TABLE>
<CAPTION>
                                                        Three Months Ended March 31,
                                                    ----------------------------------
                                                     1998                           1997
                                           ---------------------------    ----------------------------                            
                                           Weighted        Weighted       Weighted         Weighted
                                           Average         Average        Average          Average

                                           Number       Exercise Price    Number       Exercise Price
                                           ------       --------------   --------      --------------
<S>                                        <C>        <C>              <C>            <C>    
Options and warrants with
exercise prices below the average
fair market value of the
Company's common stock for
the respective period                      1,848             $ 4.61        3,753            $  7.07

Options and warrants with
exercise prices above the average
fair market value of the
Company's common stock for
the respective period                      4,433             $11.72        1,665             $15.09
                                           -----                           -----
                                           6,281                           5,418
                                           =====                           =====
</TABLE>

                                      8


<PAGE>

REGENERON PHARMACEUTICALS, INC.
Notes to Condensed Financial Statements
(In thousands, except per share data)


5.       Adoption of Statement of Financial Accounting Standard No. 130

         The Company has adopted Statement of Financial Accounting
         Standard No. 130, Reporting Comprehensive Income ("SFAS No.
         130"). Comprehensive loss represents the change in net assets of
         a business enterprise during a period from transactions and
         other events and circumstances from non-owner sources.
         Comprehensive loss of the Company includes net loss adjusted for
         the change in net unrealized gain or loss on marketable
         securities. The net effect of income taxes on comprehensive loss
         is immaterial. The disclosures required by SFAS No. 130 for the
         three months ended March 31, 1998 have been included in the
         Statement of Stockholders' Equity. For the three months ended
         March 31, 1998 and 1997, the components of comprehensive loss
         were:


<TABLE>
<CAPTION>
                                                                        1998              1997
                                                                        ----              ----
                                                                             (in thousands)
         <S>                                                           <C>               <C>    


         Net Loss                                                      $(3,829)          $(5,929)
         Change in net unrealized gain on marketable securities            (39)             (157)
                                                                       -------           -------

                  Total comprehensive loss                             $(3,868)          $(6,086)
                                                                       ========          ========
</TABLE>


                                      9


<PAGE>


I
tem 2. Management's Discussion and Analysis of Financial Condition and
        Results of Operations


General

         Overview. The discussion below contains forward-looking statements 
that involve risks and uncertainties relating to the future financial
performance of Regeneron Pharmaceuticals, Inc. ("Regeneron" or the "Company")
and actual events or results may differ materially. These statements concern,
among other things, the possible therapeutic applications of the Company's
product candidates and research programs, the timing and nature of the Company's
clinical and research programs now underway or planned, a variety of items
described herein and in the footnotes to the Company's financial statements
(including the useful life of assets, the anticipated length of agreements, and
other matters), and the future uses of capital and financial needs of the
Company. These statements are made by the Company based on management's current
beliefs and judgment. In evaluating such statements, stockholders and potential
investors should specifically consider the various factors identified under the
caption "Factors That May Affect Future Operating Results" which could cause
actual results to differ materially from those indicated by such forward-looking
statements.

         Regeneron is a leader in the application of molecular and cell 
biology to discover novel potential therapeutics for human medical conditions
and is seeking to develop and commercialize these discoveries. The Company is
applying its technological expertise in protein growth factors, their receptors,
and their mechanisms of action to the discovery and development of protein-based
drugs and orally active, small molecule drugs.

         The Company is pursuing research and development programs in the
following areas:

             o AXOKINE(R), a second generation ciliary neurotrophic
               factor, for the treatment of obesity (and diseases related
               to obesity such as Type II diabetes),
             
             o AXOKINE for the treatment of retinitis pigmentosa and other 
               retinal diseases,
               
             o Brain-derived neurotrophic factor ("BDNF") for the
               treatment of amyotrophic lateral sclerosis ("ALS," commonly
               known as Lou Gehrig's disease),

             o Neurotrophin-3 ("NT-3") for the treatment of enteric
               neuropathies (constipating conditions), 


             o Angiopoietins, a new family of ligands (and their receptors, 
               called the TIE family of receptors) that appears to regulate 
               blood vessel formation, or angiogenesis,

             o Protein antagonists for cytokines such as interleukin-4
               ("IL-4") and interleukin-6 ("IL-6") as potential treatment
               of inflammatory diseases, allergic disorders, and cancer,
               
             o Noggin, a naturally occurring protein, for potential use
               in treating abnormal bone formation and related diseases
               and conditions,

             o Muscle atrophy, based on a receptor (called MuSK) of the
               tyrosine kinases type that is specifically expressed in
               skeletal muscle and a protein ligand (agrin) for this
               receptor, and

                                      10


<PAGE>

             o Research programs to discover orally active, small
               molecule-based drugs, some of which may mimic or antagonize
               protein- or receptor-based drug candidates that the Company
               is developing.

         Discussion of First Quarter 1998 Activities. In the first quarter of 
1998, the Company continued to develop AXOKINE under the Company's collaboration
agreement ("the Procter & Gamble Agreement") with The Procter and Gamble Company
("Procter & Gamble"). Subject to completion of planned preclinical and related
development activities and regulatory review, the Company expects that an
Investigational New Drug application will be filed with the United States Food
and Drug Administration (the "FDA") by the end of 1998 or in early 1999 pursuant
to which clinical studies of AXOKINE for obesity and related conditions,
including Type II diabetes, would begin. The Company and Procter & Gamble also
continued to collaborate in research and development in the fields of
angiogenesis, bone growth, and muscle injury and atrophy, as well as small
molecule (orally active) drugs. The majority of the Company's scientific
resources are devoted to its collaborative activities with Procter & Gamble.

         The Company continued independently to develop AXOKINE for use in 
treating degenerative retinal diseases. The Company is collaborating with
academic investigators, government agencies, and private foundations in the
development of AXOKINE for retinal disease. Subject to completion of appropriate
preclinical experiments and regulatory approval, the Company plans to commence a
Phase I clinical study of AXOKINE to treat retinitis pigmentosa in late 1998 or
early 1999.

         During the first quarter of 1998, the Company continued to develop 
independent of any corporate collaboration its proprietary cytokine traps for
the potential treatment of inflammatory disease, asthma, cancer, and rheumatoid
arthritis. In addition, the Company continued to conduct research with
Pharmacopeia, Inc. and Glaxo Wellcome plc in the area of small molecule (orally

active) drugs.

         During the first quarter of 1998, Amgen-Regeneron Partners, the
partnership equally owned by Regeneron and Amgen Inc. ("Amgen"), continued to
develop brain derived neurotrophic factor ("BDNF") and neurotrophin-3 (NT-3").
BDNF is currently being developed by Amgen-Regeneron Partners for potential use
in treating amyotrophic lateral sclerosis ("ALS," commonly known as Lou Gehrig's
disease) through two routes of administration: intrathecal (infusion into the
spinal fluid through an implanted pump) and subcutaneous (injection under the
skin). An intrathecal study in ALS patients is ongoing. Subcutaneous studies
conducted by Regeneron on behalf of the partnership began in the first quarter
of 1998. The subcutaneous studies are based on an analysis of the
Amgen-Regeneron Partners' Phase III trial of BDNF for ALS that was completed in
1996. That trial failed to achieve its predetermined end points, but subsequent
analyses indicated that a retrospectively-defined subset of ALS patients in the
trial may have received a survival benefit from BDNF treatment.

         In March 1998, Sumitomo Pharmaceuticals Co., Ltd. ("Sumitomo
Pharmaceuticals"), the Company's collaborator in the development of BDNF in
Japan, began a Phase I safety assessment of BDNF delivered subcutaneously to
normal volunteers. Sumitomo Pharmaceuticals is initially developing BDNF to
treat ALS.

         Amgen-Regeneron Partners' clinical development of NT-3 is currently 
focused on enteric neuropathies (constipating conditions). The enteric nervous 
system is a complex collection of nerves that control the
function of the gastrointestinal system, including 

                                      11


<PAGE>


gastrointestinal motility. Regeneron, on behalf of Amgen-Regeneron Partners,
plans to commence by mid-1998, the first of a series of small clinical studies
of NT-3 in enteric neuropathies. The initial study includes patients suffering
from severe idiopathic constipation. Later studies may be in patients who suffer
from constipation associated with Parkinson's disease, spinal cord injury, use
of opiate pain-killers, and other conditions.

         No assurance can be given that extended administration of BDNF or 
NT-3 will be safe or effective. The treatment of ALS has been shown, in a number
of clinical settings using a variety of treatment modalities (including
Amgen-Regeneron Partners' earlier clinical studies), to present significant
difficulties. The design of an ALS clinical study presents special difficulties
and risks, as do the facts that ALS is a progressive disease that afflicts
individual patients differently and other ALS treatments are approved or have
been or are currently being tested, creating the possibility that patients in
any BDNF study may also receive other therapeutics during all or part of the
BDNF trial. The treatment of various constipating conditions may present
additional clinical trial risks in light of the complex and not wholly
understood mechanisms of action that lead to the conditions, the concurrent use
of other drugs to treat the underlying illnesses as well as the gastrointestinal
condition, the potential difficulty of designing and achieving significant

clinical end points, and other factors. No assurance can be given that these or
any other studies of BDNF or NT-3 will be successful or that BDNF or NT-3 will
be commercialized.

         Substantial risk is inherent in the research, development, and
commercialization of drugs. In addition, in each of the areas of the Company's
independent and collaborative activities, other companies and entities are
actively pursuing competitive paths toward similar objectives. The results of
the Company's and its collaborators' past activities in connection with the
research and development of AXOKINE, cytokine traps, angiopoietins, abnormal
bone growth, muscle atrophy, small molecules, BDNF, and NT-3 do not necessarily
predict the results or success of current or future activities including, but
not limited to, any additional preclinical or clinical studies. The Company
cannot predict whether, when, or under what conditions any of its research or
product candidates, including without limitation AXOKINE, BDNF, or NT-3, will be
shown to be safe or effective to treat any human condition or be approved for
marketing by any regulatory agency. The delay or failure of current or future
studies to demonstrate the safety or efficacy of the Company's product
candidates to treat human conditions or to be approved for marketing could have
a material adverse impact on the Company.

         To date, Regeneron has not received any revenues from the commercial 
sale of products and may never receive such revenues. Before such revenues can
be realized, the Company (or its collaborators) must overcome a number of
hurdles which include successfully completing its research and development
efforts and obtaining regulatory approval from the FDA or regulatory authorities
in other countries. In addition, the biotechnology and pharmaceutical industries
are rapidly evolving and highly competitive, and new developments may render the
Company's products and technologies noncompetitive and obsolete.

         From inception on January 8, 1988 through March 31, 1998, Regeneron 
had a cumulative loss of $172.4 million. In the absence of revenues from
commercial product sales or other sources (the amount, timing, nature, or source
of which cannot be predicted), the Company's losses will continue as the Company
conducts its research and development activities. The Company's activities may
expand over time and may require additional resources, and the Company's
operating losses may be substantial over at least 

                                      12


<PAGE>

the next several years. The Company's losses may fluctuate from quarter to
quarter and will depend, among other factors, on the timing of certain expenses
and on the progress of the Company's research and development efforts.


Results of Operations

         Three months ended March 31,1998 and 1997. The Company's total 
revenue increased to $8.3 million for the first quarter of 1998 from $6.2
million for the same period in 1997. Contract research and development revenue
increased to $4.6 million for the first quarter of 1998 from $4.2 million for
the same period in 1997, as higher revenue related to the P&G Agreement more

than offset a decrease in revenue from Amgen-Regeneron Partners and Sumitomo
Pharmaceuticals. Contract manufacturing revenue related to the long-term
manufacturing agreement (the "Merck Agreement") with Merck & Co., Inc. ("Merck")
increased to $1.9 million for the first quarter of 1998 compared to $0.7 million
for the same period in 1997 as a result of increased activity in preparation for
manufacturing a product for Merck at the Company's Rensselaer facility.
Investment income in the first quarter of 1998 increased to $1.8 million from
$1.3 million for the same period in 1997, due mainly to higher levels of
interest-bearing investments resulting primarily from the proceeds of a private
placement of equity securities with Procter & Gamble in June 1997.

         The Company's total operating expenses were $12.1 million in the first 
quarters of both 1998 and 1997. Research and development expenses increased to
$8.2 million in the first quarter of 1998 from $7.1 million for the same period
in 1997, primarily as a result of additional employees and increased activity in
the Company's preclinical and clinical research programs. Loss in
Amgen-Regeneron Partners decreased to $0.7 million in the first quarter of 1998
from $1.7 million for the same period in 1997, as the level of clinical trial
activity declined. Research and development expenses (including loss in
Amgen-Regeneron Partners) were approximately 73% of total operating expenses in
the first quarter of 1998, compared to 72% for the same period in 1997.

         General and administrative expenses decreased slightly to $1.4 million
in the first quarter 1998 from $1.5 million for the same period in 1997.
Depreciation and amortization expense decreased to $0.9 million in the first
quarter of 1998 from $1.2 million in the first quarter of 1997, as certain
laboratory equipment became fully depreciated. Contract manufacturing expenses,
which are direct expenses related to the Merck Agreement and are reimbursed by
Merck, increased to $0.9 million in the first quarter of 1998 from $0.5 million
in the same period of 1997, primarily from increased manufacturing support by
Company personnel. Interest expense decreased to $0.1 million from $0.2 million
in the first quarters of 1998 and 1997, respectively, as the amount of
outstanding obligations in connection with capital leases declined.

         The Company's net loss for the first quarter of 1998 was $3.8 million,
or $0.12 per share (basic and diluted), compared to a net loss of $5.9 million,
or $0.23 per share (basic and diluted), for the same period in 1997.


Liquidity and Capital Resources

         Since its inception in 1988, the Company has financed its operations 
primarily through private placements and public offerings of its equity
securities, revenue earned under the several agreements between the Company and
each of Amgen, Sumitomo 

                                      13


<PAGE>

Chemical Company, Ltd., Sumitomo Pharmaceuticals, Merck, and Procter & Gamble
and investment income.

         In May 1997, the Company and Procter & Gamble entered into the P&G 

Agreement. Procter & Gamble agreed over the first five years of the P&G
Agreement to purchase up to $60.0 million in Regeneron equity (of which $42.9
was purchased in June 1997) and provide up to $94.7 million in support of
Regeneron's research efforts related to the collaboration. During the second
five years of the P&G Agreement, the companies will share all research costs
equally. Clinical testing and commercialization expenses for jointly developed
products will be shared equally throughout the ten years of the collaboration.
The companies expect jointly to develop and market worldwide any products
resulting from the collaboration and share equally in profits. Either company
may terminate the P&G Agreement at the end of five years with at least one year
prior notice or earlier in the event of a default (as defined in the P&G
Agreement). In September 1997, the Company and Procter & Gamble expanded the P&G
Agreement to include AXOKINE and related molecules (delivered systemically), and
agreed to develop AXOKINE initially to treat obesity associated with Type II
diabetes. Procter & Gamble agreed to reimburse the Company for certain research
and development costs and pay as much as $15.0 million in additional funding,
partly subject to achieving certain milestones related to AXOKINE. Of the $15.0
million, $5.0 million was paid in 1997 and an additional $5.0 million is
expected in 1998.

         In connection with the Company's agreement to collaborate with
Sumitomo Pharmaceuticals in the research and development of BDNF in Japan, the
Company continues to be reimbursed in connection with supplying Sumitomo
Pharmaceuticals with BDNF for preclinical and clinical use. The Company expects
to receive a $5.0 million milestone payment during 1998 in connection with the
start of Sumitomo's Phase I clinical study of BDNF.

         The Company's activities relating to BDNF and NT-3, as agreed upon by 
Amgen and Regeneron, are being reimbursed by Amgen-Regeneron Partners, and the
Company recognizes such reimbursement as revenue. The funding of Amgen-Regeneron
Partners is through capital contributions from Amgen and Regeneron, who must
make equal payments in order to maintain equal ownership and equal sharing of
any profits or losses from the partnership. The Company has made capital
contributions totaling approximately $45.2 million to Amgen-Regeneron Partners
from the partnership's inception in June 1993 through December 31, 1997. The
Company expects that its capital contributions in 1998 will total $5.7 million
for the full year, of which $2.4 million has been funded through May 1998. These
contributions could increase or decrease, depending upon the cost of
Amgen-Regeneron Partners' conducting additional BDNF and NT-3 studies and the
outcomes of those and other ongoing studies.

         From its inception in January 1988 through March 31, 1998, the Company
invested approximately $56.7 million in property, plant, and equipment. This
includes $16.8 million to acquire and renovate the Rensselaer facility and $14.1
million of completed construction at the facility related to the Merck
Agreement. In connection with the purchase and renovation of the Rensselaer
facility, the Company obtained financing of $2.0 million from the New York State
Urban Development Corporation, of which $1.7 million is outstanding. Under the
terms of such financing, the Company is not permitted to declare or pay
dividends to its stockholders.

                                      14


<PAGE>

         The Company expects that expenses related to the filing, prosecution, 
defense, and enforcement of patent and other intellectual property claims will
continue to be substantial as a result of patent filings and prosecutions in the
United States and foreign countries. The Company is currently involved in
interference proceedings in the Patent and Trademark Office between Regeneron's
patent applications and patents relating to ciliary neurotrophic factor ("CNTF")
issued to Synergen, Inc. ("Synergen"). Amgen acquired all outstanding shares of
Synergen in 1994. In March 1998, the Company and Amgen entered into a covenant
not to sue each other which, among other things, resolved their patent
interference and related opposition and other patent proceedings relating to
CNTF and AXOKINE. The Company also granted Amgen a license to use CNTF and
second generation CNTFs other than AXOKINE to treat retinal degenerative
conditions. Neither party will pay royalties or make other payments to the other
party in consideration of this agreement.

         As of March 31, 1998, the Company had no established banking
arrangements through which it could obtain short-term financing or a line of
credit. Additional funds may be raised through, among other things, the issuance
of additional securities, other financing arrangements, and future collaboration
agreements. No assurance can be given that additional financing will be
available or, if available, that it will be available on acceptable terms. In
addition, the Company estimates that through mid-2002 it could receive
additional payments from Procter & Gamble in the form of research funding,
milestones, and equity purchases of as much as $100 million or more.

         At March 31, 1998, the Company had $122.5 million in cash, cash
equivalents, and marketable securities. The Company expects to incur substantial
funding requirements for, among other things, research and development
activities (including preclinical and clinical testing), validation of
manufacturing facilities, and the acquisition of equipment. The Company expects
to incur ongoing funding requirements for capital contributions to
Amgen-Regeneron Partners to support the continued development and clinical
trials of BDNF and NT-3. The amount needed to fund operations will also depend
on other factors, including the status of competitive products, the success of
the Company's research and development programs, the status of patents and other
intellectual property rights developments, and the continuation, extent, and
success of any collaborative research programs (including those with Amgen and
Procter & Gamble). The Company believes that its existing capital resources will
enable it to meet operating needs for at least several years. No assurance can
be given that there will be no change in projected revenues or expenses that
would lead to the Company's capital being consumed significantly before such
time.


Factors That May Affect Future Operating Results

         Regeneron cautions stockholders and potential investors that the
following important factors, among others, in some cases have affected, and in
the future could affect, Regeneron's actual results and could cause Regeneron's
actual results to differ materially from those expressed in any forward-looking
statements made by, or on behalf of, Regeneron. The statements under this
caption are intended to serve as cautionary statements within the meaning of the

Private Securities Litigation Reform Act of 1995. The following information is
not intended to limit in any way the characterization of other statements or
information under other captions as cautionary statements for such purpose:

                                      15


<PAGE>


     o    Delay, difficulty, or failure of the Company's research and
          development programs to produce product candidates that are
          scientifically or commercially appropriate for further
          development by the Company or others.

     o    Cancellation or termination of material collaborative or
          licensing agreements (including in particular, but not limited
          to, those with Procter & Gamble and Amgen) and the resulting
          loss of research or other funding could have a material adverse
          effect on the Company and its operations. A change of control
          of one or more of the Company's material collaborators or
          licensees could also have a material adverse effect on the
          Company.

     o    Delay, difficulty, or failure in obtaining regulatory approval
          (including approval of its facilities for production) for the
          Company's products (including vaccine intermediate for Merck),
          including delays or difficulties in development because of
          insufficient proof of safety or efficacy.

     o    Increased and irregular costs of development, manufacture,
          regulatory approval, sales, and marketing associated with the
          introduction of products in the late stage of development.

     o    Competitive or market factors that may cause use of the
          Company's products to be limited or otherwise fail to achieve
          broad acceptance.

     o    The ability to obtain, maintain, and prosecute intellectual
          property rights, and the cost of acquiring in-process
          technology and other intellectual property rights, either by
          license, collaboration, or purchase of another entity.

     o    Difficulties or high costs of obtaining adequate financing to
          meet the Company's obligations under its collaboration and
          licensing agreements or to fund 50 percent of the cost of
          developing product candidates in order to retain 50 percent of
          the commercialization rights.

     o    Amount and rate of growth of Regeneron's general and
          administrative expenses, and the impact of unusual or
          infrequent charges resulting from Regeneron's ongoing
          evaluation of its business strategies and organizational
          structure.


     o    Failure of corporate partners to develop or commercialize
          successfully the Company's products or to retain and expand the
          markets served by the commercial collaborations; conflicts of
          interest, priorities, and commercial strategies which may arise
          between the Company and such corporate partners.

     o    Delays or difficulties in developing and acquiring production
          technology and technical and managerial personnel to
          manufacture novel biotechnology products in commercial
          quantities at reasonable costs and in compliance with
          applicable quality assurance and environmental regulations and
          governmental permitting requirements.

     o    Difficulties in obtaining key raw materials and supplies for
          the manufacture of the Company's product candidates.

                                      16


<PAGE>

     o    The costs and other effects of legal and administrative cases
          and proceedings (whether civil, such as product- or
          employment-related, or environmental, or criminal); settlements
          and investigations; developments or assertions by or against
          Regeneron relating to intellectual property rights and
          licenses; the issuance and use of patents and proprietary
          technology by Regeneron and its competitors, including the
          possible negative effect on the Company's ability to develop,
          manufacture, and sell its products in circumstances where it is
          unable to obtain licenses to patents which may be required for
          such products.

     o    Underutilization of the Company's existing or new manufacturing
          facilities or of any facility expansions, resulting in
          inefficiencies and higher costs; start-up costs,
          inefficiencies, delays, and increased depreciation costs in
          connection with the start of production in new plants and
          expansions.

     o    Health care reform, including reductions or changes in
          reimbursement available for prescription medications or other
          reforms.

     o    The ability to attract and retain key personnel. As Regeneron's
          scientific efforts lead to potentially promising new
          directions, both outside of recombinant protein therapies (into
          orally active, small molecule pharmaceuticals) and outside of
          treatments for neurological and neurodegenerative conditions
          (into, for example, potential programs in obesity, diabetes,
          cancer, inflammation, muscle disease, bone growth disorders,
          and angiogenesis), the Company will require additional internal
          expertise or external collaborations in areas in which it
          currently does not have substantial resources and personnel.


         The Company is evaluating the need to modify its computer
systems and software to properly handle information and transactions
relating to the year 2000. Presently the Company believes that with
modifications to some existing software, the year 2000 issue can be
mitigated. The Company plans to complete the year 2000 project not later
than December 31, 1998, and does not expect the cost of such
modifications to be material.

                                      17


<PAGE>


P
ART II. OTHER INFORMATION



ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K


(a)      Exhibits

                  27       Financial Data Schedule


(b)      Reports

                  No reports on Form 8-K were filed by the registrant
during the quarter ended March 31, 1998.


                                      18


<PAGE>


                                  SIGNATURE


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



                                       Regeneron Pharmaceuticals, Inc.


Date:    May 8, 1998              By:       /s/ Murray A. Goldberg
     --------------------------      ---------------------------------
                                      Murray A. Goldberg
                                      Vice President, Finance & Administration,
                                      Chief Financial Officer, and Treasurer



                                      19






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