<PAGE>
==============================================================================

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

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

                                    FORM 10-Q

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

      FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2002

[_]   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 0-19612

                          IMCLONE SYSTEMS INCORPORATED
             (Exact name of registrant as specified in its charter)

                DELAWARE                                  04-2834797
     (State or other jurisdiction of                     (IRS employer
     incorporation or organization)                   identification no.)

     180 VARICK STREET, NEW YORK, NY                         10014
   (Address of principal executive offices)                (Zip code)

                                 (212) 645-1405
               REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE

                                 NOT APPLICABLE
Former name, former address and former fiscal year, if changed since last report

         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 [_]

Applicable only to corporate issuers:

Indicate the number of shares outstanding of each of the registrant's classes
of common stock, as of the latest practicable date.

         CLASS                          OUTSTANDING AS OF MAY 13, 2002
         -----                          ------------------------------
Common Stock, par value $.001                     73,361,837 Shares

==============================================================================

<PAGE>

                          IMCLONE SYSTEMS INCORPORATED

                                     INDEX

<TABLE>
<CAPTION>

                                                                                                           PAGE NO.
                                                                                                           --------
<S>           <C>                                                                                             <C>
PART I - FINANCIAL INFORMATION

    Item 1.    Financial Statements

               Consolidated Balance Sheets - March 31, 2002 (unaudited) and December 31, 2001................   1

               Unaudited Consolidated Statements of Operations - Three months ended
               March 31, 2002 and 2001.......................................................................   2

               Unaudited Consolidated Statements of Cash Flows - Three months ended
               March 31, 2002 and 2001.......................................................................   3

               Notes to Consolidated Financial Statements....................................................   4

    Item 2.    Management's Discussion and Analysis of Financial Condition and Results of Operations.........  12

    Item 3.    Quantitative and Qualitative Disclosures About Market Risk..................................... 21

PART II - OTHER INFORMATION

    Item 1.    Legal Proceedings.............................................................................  22

    Item 2.    Changes in Securities and Use of Proceeds.....................................................  23

    Item 6.    Exhibits and Reports on Form 8-K..............................................................  23

</TABLE>





<PAGE>

PART 1 - FINANCIAL INFORMATION
Item 1 - Financial Statements

                          IMCLONE SYSTEMS INCORPORATED

                           CONSOLIDATED BALANCE SHEETS
                 (IN THOUSANDS, EXCEPT PER SHARE AND SHARE DATA)

<TABLE>
<CAPTION>
                                                                                  MARCH 31,    DECEMBER 31,
                                                                                    2002            2001
                                                                                  ----------    ------------
                                                                                 (Unaudited)
<S>                                                                              <C>            <C>
                                    ASSETS
Current assets:
        Cash and cash equivalents...........................................     $  114,684     $   38,093
        Securities available for sale.......................................        300,055        295,893
        Prepaid expenses....................................................          3,476          3,891
        Amounts due from corporate partners (Note 7)........................         12,632          8,230
        Other current assets................................................          4,550          3,547
                                                                                 ----------     ----------
              Total current assets.........................................         435,397        349,654
                                                                                 ----------     ----------
Property and equipment, net................................................         123,023        107,248
Patent costs, net..........................................................           1,525          1,513
Deferred financing costs, net..............................................           4,982          5,404
Notes receivable...........................................................          10,000         10,000
Other assets  .............................................................           3,637            383
                                                                                 ----------     ----------
                                                                                 $  578,564     $  474,202
                                                                                 ==========     ==========

                LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)

Current liabilities:
        Accounts payable....................................................     $   13,574     $   16,919
        Accrued expenses....................................................         16,811         11,810
        Interest payable....................................................          1,203          4,446
        Current portion of deferred revenue (Note 7)........................         35,760         20,683
        Current portion of long-term liabilities............................            330            426
                                                                                 ----------     ----------
                   Total current liabilities................................         67,678         54,284
                                                                                 ----------     ----------
Deferred revenue, less current portion (Note 7)............................         301,074        182,813
Long-term debt.............................................................         242,200        242,200
Other long-term liabilities, less current portion..........................              25             79
                                                                                 ----------     ----------
                   Total liabilities.......................................         610,977        479,376
                                                                                 ----------     ----------

Commitments and contingencies (Note 8)
Stockholders' equity (deficit):
         Common stock, $.001 par value; authorized 120,000,000 shares;
              issued 73,531,112 and 73,348,271 at March 31, 2002 and
              December 31, 2001, respectively, outstanding 73,341,862, and
              73,159,021 at March 31, 2002 and December 31, 2001,
              respectively..................................................             74             73
        Additional paid-in capital..........................................        345,042        341,735
        Accumulated deficit.................................................       (376,064)      (346,037)
        Treasury stock, at cost; 189,250 shares at March 31, 2002 and
              December 31, 2001.............................................         (4,100)        (4,100)
        Accumulated other comprehensive income:
              Unrealized gain on securities available for sale..............          2,635          3,155
                                                                                 ----------     ----------
                   Total stockholders' equity (deficit).....................        (32,413)        (5,174)
                                                                                 ----------     -----------
                                                                                 $  578,564     $  474,202
                                                                                 ==========     ==========
</TABLE>

           See accompanying notes to consolidated financial statements


                                     Page 1
<PAGE>



                          IMCLONE SYSTEMS INCORPORATED

                      CONSOLIDATED STATEMENTS OF OPERATIONS
                      (IN THOUSANDS, EXCEPT PER SHARE DATA)
                                   (unaudited)
<TABLE>
<CAPTION>

                                                                                          THREE MONTHS ENDED
                                                                                               MARCH 31,
                                                                                        2002             2001
                                                                                      ---------        --------
<S>                                                                                   <C>              <C>
Revenues:
   License fees and milestone revenue (Note 7).....................................   $   6,663        $ 24,096
   Research and development funding and royalties..................................         650             648
   Collaborative agreement revenue (Note 7)........................................      11,238           3,251
                                                                                      ---------        --------
       Total revenues..............................................................      18,551          27,995
                                                                                      ---------        --------
Operating expenses:
   Research and development........................................................      37,778          25,096
   Marketing, general and administrative...........................................       8,123           3,728
   Expenses associated with the amended Bristol-Myers Squibb Company ("BMS")
         Commercial Agreement......................................................       2,250              --
                                                                                      ---------        --------
       Total operating expenses....................................................      48,151          28,824
                                                                                      ---------        --------
             Operating loss........................................................     (29,600)           (829)
                                                                                      ---------        --------
Other:
   Interest income.................................................................      (2,264)         (4,565)
   Interest expense................................................................       3,492           3,313
   Loss (gain) on securities and investments.......................................        (801)          1,618
                                                                                      ----------       --------
       Net interest and other expense..............................................         427             366
                                                                                      ---------        --------
                Net loss...........................................................   $ (30,027)       $ (1,195)
                                                                                      =========        ========
Net loss per common share:
   Basic and diluted:
       Net loss per common share...................................................   $   (0.41)       $  (0.02)
                                                                                      =========        ========
Weighted average shares outstanding................................................      73,307          66,258
                                                                                      =========        ========
</TABLE>
           See accompanying notes to consolidated financial statements

                                     Page 2
<PAGE>


                          IMCLONE SYSTEMS INCORPORATED
                      CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)
                                   (UNAUDITED)
<TABLE>
<CAPTION>

                                                                                                     THREE MONTHS ENDED
                                                                                                          MARCH 31,
                                                                                                   2002             2001
                                                                                                 ---------        --------
<S>                                                                                              <C>              <C>
Cash flows from operating activities:
Net loss.....................................................................................    $ (30,027)       $ (1,195)
Adjustments to reconcile net loss to net cash used in operating activities:
         Depreciation and amortization.......................................................        2,190             606
         Amortization of deferred financing costs............................................          422             422
         Expense associated with issuance of options and warrants............................            4             421
         (Gain) loss on securities available for sale........................................         (801)             18
         Write-down of investment in Valigen N.V.............................................            -           1,600
         Changes in:
              Prepaid expenses...............................................................          415            (835)
              Amounts due from corporate partners (including amounts received from BMS
                 of $6,533 for the three months ended March 31, 2002)........................       (4,402)              -
              Note receivable - officer......................................................            -              (8)
              Other current assets...........................................................       (1,003)           (611)
              Other assets...................................................................       (3,254)             12
              Interest payable...............................................................       (3,243)         (3,238)
              Accounts payable...............................................................       (3,345)         (6,034)
              Accrued expenses...............................................................        5,001           2,060
              Deferred revenue (including amounts received from BMS of $140,000
                 for the three months ended March 31, 2002)..................................      133,338             (97)
              Fees potentially refundable to Merck KGaA......................................            -         (24,000)
                                                                                                 ---------        ---------
                   Net cash provided by (used in) operating activities.......................       95,295         (30,879)
                                                                                                 ---------        --------

Cash flows from investing activities:
    Acquisitions of property and equipment...................................................      (17,922)        (15,074)
    Purchases of securities available for sale...............................................     (138,819)        (11,456)
    Sales and maturities of securities available for sale....................................      134,938          25,554
    Additions to patents.....................................................................          (55)            (69)
                                                                                                 ---------        ---------
              Net cash used in investing activities..........................................      (21,858)         (1,045)
                                                                                                 ---------        --------
Cash flows from financing activities:
    Proceeds from exercise of stock options and warrants.....................................        2,651           1,204
    Proceeds from issuance of common stock under the employee stock purchase plan............          167             178
    Proceeds from short-swing profit rule....................................................          486               -
    Purchase of treasury stock...............................................................            -          (1,830)
    Payment of preferred stock dividends.....................................................            -          (5,764)
    Redemption of series A preferred stock...................................................            -         (20,000)
    Payments of other liabilities............................................................         (150)           (203)
                                                                                                 ---------        --------
              Net cash provided by (used in) financing activities............................        3,154         (26,415)
                                                                                                 ---------        ---------
              Net increase (decrease) in cash and cash equivalents...........................       76,591         (58,339)
Cash and cash equivalents at beginning of period.............................................       38,093          60,325
                                                                                                 ---------        --------
Cash and cash equivalents at end of period...................................................    $ 114,684        $  1,986
                                                                                                 =========        ========
Supplemental cash flow information:
    Cash paid for interest, including amounts capitalized of $300 and $494
         for the three months ended March 31, 2002 and 2001, respectively....................    $   6,613        $  6,623
                                                                                                 =========        ========
</TABLE>

           See accompanying notes to consolidated financial statements

                                     Page 3
<PAGE>



                          IMCLONE SYSTEMS INCORPORATED

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                                   (UNAUDITED)

(1)   BASIS OF PREPARATION

         The consolidated financial statements of ImClone Systems Incorporated
("ImClone Systems" or the "Company") as of March 31, 2002 and for the three
months ended March 31, 2002 and 2001 are unaudited. In the opinion of
management, these unaudited financial statements include all adjustments,
consisting only of normal recurring adjustments, necessary for a fair
presentation. These financial statements should be read in conjunction with the
audited financial statements and notes thereto included in the Company's Annual
Report on Form 10-K for the year ended December 31, 2001, as filed with the
Securities and Exchange Commission ("SEC").

         Results for the interim periods are not necessarily indicative of
results for the full years.

         Pursuant to the guidance in Emerging Issues Task Force Issue No. 01-14,
Income Statement Characterization of Reimbursements Received for "Out-of-Pocket"
Expenses Incurred ("EITF No. 01-14"), the Company changed its classification for
corporate partner reimbursements effective January 1, 2002 to characterize such
reimbursements received for research and development and marketing expenses
incurred as collaborative agreement revenue in the consolidated statements of
operations. Prior to January 1, 2002, the Company characterized such
reimbursements as a reduction of expenses in the consolidated statements of
operations. As prescribed in EITF No. 01-14, all comparative financial
statements for prior periods have been reclassified to comply with this
guidance.


(2)  PROPERTY AND EQUIPMENT

         Property and equipment are recorded at cost and consist of the
following:

<TABLE>
<CAPTION>

                                                              MARCH 31,          DECEMBER 31,
                                                                2002                2001
                                                            --------------      --------------
<S>                                                         <C>                 <C>
Land.....................................................   $    3,858,000      $    2,733,000
Building and building improvements.......................       57,062,000          50,720,000
Leasehold improvements...................................        8,330,000           8,302,000
Machinery and equipment..................................       35,108,000          33,057,000
Furniture and fixtures...................................        2,073,000           2,031,000
Construction in progress.................................       41,414,000          33,080,000
                                                            --------------      --------------
             Total cost..................................      147,845,000         129,923,000
Less accumulated depreciation and amortization...........      (24,822,000)        (22,675,000)
                                                            --------------      -------------
Property and equipment, net.............................    $  123,023,000      $  107,248,000
                                                            ==============      ==============
</TABLE>

         The Company is building a second commercial manufacturing facility
adjacent to its new product launch manufacturing facility in New Jersey. This
new facility will be a multi-use facility with capacity of up to 110,000 liters
(working volume). The 250,000 square foot facility will cost approximately
$225,000,000, and is being built on land purchased in December 2000. The actual
cost of the new facility may change depending upon various factors. The Company
incurred approximately $36,790,000, (included in construction in progress above)
excluding capitalized interest of approximately $1,040,000, in conceptual
design, engineering and pre-construction costs through March 31, 2002. Through
April 26, 2002, committed purchase orders totaling approximately $43,676,000
have been placed for subcontracts and equipment related to this project. In
addition, $49,471,000 in engineering, procurement, construction management and
validation costs were committed.

         In January 2002, the Company purchased real estate consisting of a 7.5
acre parcel of land located adjacent to the Company's product launch
manufacturing facility and pilot facility in Somerville, New Jersey. The real
estate includes an existing 50,000 square foot building,

                                     Page 4
<PAGE>

40,000 square feet of which is warehouse space and 10,000 square feet of which
is office space. The purchase price for the property and improvements was
approximately $7,020,000 of which, approximately $1,125,000 related to the
purchase of the land and approximately $5,895,000 related to the purchase of the
building and building improvement. The Company intends to use this property for
warehousing and logistics for its Somerville campus.

         The process of preparing consolidated financial statements in
accordance with accounting principles generally accepted in the United States of
America requires the Company to evaluate the carrying values of its long-lived
assets. The recoverability of the carrying values of the Company's product
launch manufacturing facility and its second commercial manufacturing facility
currently in process will depend on (1) receiving FDA approval of our
interventional therapeutic product candidate for cancer, ERBITUX(TM), (2)
receiving FDA approval of the manufacturing facilities and (3) the Company's
ability to earn sufficient returns on ERBITUX. Based on management's current
estimates, the Company expects to recover the carrying value of such assets.

(3)   MANUFACTURING CONTRACT SERVICES

         In December 1999, the Company entered into a development and
manufacturing services agreement with Lonza Biologics PLC ("Lonza"). This
agreement was amended in April 2001 to include additional services. Under the
agreement, Lonza is responsible for process development and scale-up to
manufacture ERBITUX in bulk form under cGMP conditions. These steps were taken
to assure that the manufacturing process would produce bulk material that
conforms with the Company's reference material. The Company has incurred
approximately $38,000 in the three months ended March 31, 2002, and $7,068,000
from inception through March 31, 2002 for services provided under the
development and manufacturing services agreement. In September 2000, the Company
entered into a three-year commercial manufacturing services agreement with Lonza
relating to ERBITUX. This agreement was amended in June 2001 and again in
September 2001 to include additional services. The total cost for services to be
provided under the three-year commercial manufacturing services agreement is
approximately $86,955,000. The Company has incurred approximately $7,070,000 in
the three months ended March 31, 2002, and $17,383,000 from inception through
March 31, 2002 for services provided under the commercial manufacturing services
agreement. Under these two agreements, Lonza is manufacturing ERBITUX at the
5,000 liter scale under cGMP conditions and is delivering it to the Company over
a term ending no later than December 2003. The costs associated with both of
these agreements are included in research and development expenses when incurred
and will continue to be so classified until such time as ERBITUX may be approved
for sale or until the Company obtains obligations from its corporate partners to
purchase such product. In the event of such approval or obligations from its
corporate partners, the subsequent costs associated with manufacturing ERBITUX
for commercial sale will be included in inventory and expensed when sold. In the
event the Company terminates the commercial manufacturing services agreement
without cause, the Company will be required to pay 85% of the stated costs for
each of the first ten batches cancelled, 65% of the stated costs for each of the
next ten batches cancelled and 40% of the stated costs for each of the next six
batches cancelled. The batch cancellation provisions for certain additional
batches that we are committed to purchase require the company to pay 100% of the
stated costs of cancelled batches scheduled within six months of the
cancellation, 85% of the stated costs of cancelled batches scheduled between six
and twelve months following the cancellation and 65% of the stated costs of
cancelled batches scheduled between twelve and eighteen months following the
cancellation. These amounts are subject to mitigation should Lonza use its
manufacturing capacity caused by such termination for another customer. At March
31, 2002, the estimated remaining future commitments under the amended
commercial manufacturing services agreement are $45,522,000 in 2002 and
$24,050,000 in 2003.

         In December 2001, the Company entered into an agreement with Lonza to
manufacture ERBITUX at the 2,000 liter scale for use in clinical trials by Merck
KGaA (the "2,000L Lonza Agreement"). The costs associated with the agreement are
reimbursable by Merck KGaA and accordingly are accounted for as collaborative
agreement revenue and such costs are also included in research and development
expenses in the consolidated statement of operations. The Company has incurred
approximately $1,762,000 in the three months ended March 31, 2002, and
$4,245,000 from inception through March 31, 2002 for services provided under
this agreement. Approximately $1,895,000 and $133,000 was reimbursable by Merck
KGaA at March 31, 2002 and December 31, 2001, respectively, and included in
amounts due from corporate partners in the consolidated balance sheets. At March
31, 2002, the estimated remaining future commitments under this agreement are
$2,938,000 in 2002.

         In January 2002, the Company executed a letter of intent with Lonza to
enter into a long-term supply agreement. The long-term supply agreement would
apply to a large scale manufacturing facility that Lonza is constructing. The
Company expects such facility would be able to produce ERBITUX in 20,000 liter
batches. The Company paid Lonza $3,250,000 for the exclusive

                                     Page 5
<PAGE>

negotiating right of a long-term supply agreement, which amount is included in
Other assets at March 31, 2002 in the consolidated balance sheet. Such
negotiations commenced shortly thereafter and are continuing. Under certain
conditions such payment shall be refunded to the Company. Provided the Company
enters into a long-term supply agreement, such payment shall be creditable
against the 20,000 liter batch price.

(4)   INVESTMENT IN VALIGEN N.V.

         In May 2000, the Company made an equity investment in ValiGen N.V.
("ValiGen"), a private biotechnology company specializing in therapeutic target
identification and validation using the tools of genomics and gene expression
analysis. The Company purchased 705,882 shares of ValiGen's series A preferred
stock and received a five-year warrant to purchase 388,235 shares of ValiGen's
common stock at an exercise price of $12.50 per share. The aggregate purchase
price was $7,500,000. The Company assigned a value of $594,000 to the warrant
based on the Black-Scholes Pricing Model. The ValiGen series A preferred stock
contains voting rights identical to holders of ValiGen's common stock. Each
share of ValiGen series A preferred stock is convertible into one share of
ValiGen common stock. The Company may elect to convert the ValiGen series A
preferred stock at any time; provided, that the ValiGen preferred stock will
automatically convert into ValiGen common stock upon the closing of an initial
public offering of ValiGen's common stock with gross proceeds of not less than
$20,000,000. The Company also received certain protective rights and customary
registration rights under this arrangement. The Company recorded this original
investment in ValiGen using the cost method of accounting. During the second
quarter of 2001, the Company purchased 160,000 shares of ValiGen's series B
preferred stock for $2,000,000. The terms of the series B preferred stock are
substantially the same as the series A preferred stock. The investment in
ValiGen represented approximately 7% of ValiGen's outstanding equity at the time
of purchase. As of June 30, 2001, the Company had completely written-off its
investment in ValiGen determined based on the modified equity method of
accounting. Included in loss on securities and investments for the three months
ended March 31, 2001 is a $1,600,000 write-down of the Company's investment in
Valigen. In the spring of 2001, the Company also entered into a no-cost
Discovery Agreement with ValiGen to evaluate certain of its technology. The
Company's Chief Executive Officer is a member of ValiGen's Board of Directors.

(5)   NET LOSS PER COMMON SHARE

         Basic and diluted net loss per common share are computed based on the
net loss for the relevant period, divided by the weighted average number of
common shares outstanding during the period. Potentially dilutive securities,
including convertible preferred stock, convertible debt, options and warrants,
have not been included in the diluted loss per common share computation because
they are anti-dilutive.

(6)   COMPREHENSIVE INCOME (LOSS)

         The following table reconciles net loss to comprehensive income (loss):


<TABLE>
<CAPTION>
                                                                                               THREE MONTHS ENDED
                                                                                                    MARCH 31,
                                                                                      -----------------------------------
                                                                                              2002             2001
                                                                                      -----------------  ----------------

<S>                                                                                    <C>               <C>
Net loss..........................................................................     $   (30,027,000)  $    (1,195,000)
Other comprehensive income (loss):

   Unrealized holding gain arising during the period..............................             281,000         1,938,000
   Reclassification adjustment for realized (gain) loss included in net loss                  (801,000)           18,000
                                                                                        --------------    --------------
      Total other comprehensive income (loss).....................................            (520,000)        1,956,000
                                                                                        --------------    --------------
Total comprehensive income (loss).................................................     $   (30,547,000)  $       761,000
                                                                                       ===============   ===============
</TABLE>


                                     Page 6
<PAGE>
(7)  COLLABORATIVE AGREEMENTS

(a)  MERCK KGaA

         Effective April 1990, the Company entered into a development and
commercialization agreement with Merck KGaA with respect to BEC2 and the
recombinant gp75 antigen. The agreement has been amended a number of times, most
recently in December 1997. The agreement grants Merck KGaA a license, with the
right to sublicense, to make, have made, use, sell, or have sold BEC2 and gp75
outside North America. The agreement also grants Merck KGaA a license, without
the right to sublicense, to use, sell, or have sold, but not to make BEC2 within
North America in conjunction with the Company. Pursuant to the terms of the
agreement the Company has retained the rights, (1) without the right to
sublicense, to make, have made, use, sell, or have sold BEC2 in North America in
conjunction with Merck KGaA and (2) with the right to sublicense, to make, have
made, use, sell, or have sold gp75 in North America. In return, the Company has
recognized research support payments totaling $4,700,000 and is entitled to no
further research support payments under the agreement. Merck KGaA is also
required to make payments of up to $22,500,000, of which $4,000,000 has been
recognized, through March 31, 2002, based on milestones achieved in the licensed
products' development. Merck KGaA is also responsible for worldwide costs of up
to DM17,000,000 associated with a multi-site, multinational phase III clinical
trial for BEC2 in limited disease small-cell lung carcinoma. This expense level
was reached during the fourth quarter of 2000 and all expenses incurred from
that point forward are being shared 60% by Merck KGaA and 40% by the Company.
Such cost sharing applies to all expenses beyond the DM17,000,000 threshold. The
Company has incurred approximately $121,000 and $122,000 in reimbursable
research and development expenses associated with this agreement in the three
months ended March 31, 2002 and 2001, respectively. These amounts have been
recorded as research and development expenses and also as collaborative
agreement revenue in the consolidated statements of operations. Merck KGaA is
also required to pay royalties on the eventual sales of BEC2 outside of North
America, if any. Revenues from sales, if any, of BEC2 in North America will be
distributed in accordance with the terms of a co-promotion agreement to be
negotiated by the parties.

         In December 1998, the Company entered into a development and license
agreement with Merck KGaA with respect to ERBITUX. In exchange for granting
Merck KGaA exclusive rights to market ERBITUX outside of the United States and
Canada and co-development rights in Japan, the Company received through March
31, 2002, $30,000,000 in up-front fees and early cash-based milestone payments
based on the achievement of defined milestones. In March 2001, the Company
satisfied a condition relating to obtaining certain collateral license
agreements associated with the ERBITUX development and license agreement with
Merck KGaA. The satisfaction of this condition allowed for the recognition of
$24,000,000 in previously received milestone payments and initiated revenue
recognition of the $4,000,000 up-front payment received in connection with this
agreement. An additional $30,000,000 can be received, of which $5,000,000 has
been received as of March 31, 2002, assuming the achievement of further
milestones for which Merck KGaA will receive equity in the Company. The equity
underlying these milestone payments will be priced at varying premiums to the
then-market price of the common stock depending upon the timing of the
achievement of the respective milestones. If issuing shares of common stock to
Merck KGaA would result in Merck KGaA owning greater than 19.9% of our common
stock, the milestone shares will be a non-voting preferred stock, or other
non-voting stock convertible into the Company's common stock. These convertible
securities will not have voting rights. They will be convertible at a price
determined in the same manner as the purchase price for shares of the Company's
common stock if shares of common stock were to be issued. They will not be
convertible into common stock if, as a result of the conversion, Merck KGaA
would own greater than 19.9% of the Company's common stock. This 19.9%
limitation is in place through December 2002. Merck KGaA will pay the Company a
royalty on future sales of ERBITUX outside of the United States and Canada, if
any. This agreement may be terminated by Merck KGaA in various instances,
including (1) at its discretion on any date on which a milestone is achieved (in
which case no milestone payment will be made), or (2) for a one-year period
after first commercial sale of ERBITUX in Merck KGaA's territory, upon Merck
KGaA's reasonable determination that the product is economically unfeasible (in
which case Merck KGaA is entitled to a return of 50% of the cash-based up front
fees and milestone payments then paid to date, but only out of revenues received
by ImClone, if any, based upon a royalty rate applied to the gross profit from
ERBITUX sales or a percentage of ERBITUX fees and royalties received from a
sublicensee on account of the sale of ERBITUX in the United States and Canada).
In August 2001, the Company  and Merck KGaA amended this agreement to provide,
among other things, that Merck KGaA may manufacture ERBITUX for supply in its
territory and may utilize a third party to do so upon the Company's reasonable
acceptance. The amendment further released Merck KGaA from its obligations under
the agreement relating to providing a guaranty under a $30,000,000 credit
facility relating to the build-out of the Company's product launch manufacturing
facility. In addition, the amendment provides that the companies have
co-exclusive rights to ERBITUX in Japan, including the right to sublicense, and
that Merck KGaA has waived its right of first offer in the case of a proposed
sublicense by the Company of ERBITUX in the Company's territory. In
consideration for the amendment, the Company agreed to a reduction in royalties
payable by Merck KGaA on sales of ERBITUX in Merck KGaA's territory.



                                     Page 7
<PAGE>

         In conjunction with Merck KGaA, the Company has expanded the trial of
ERBITUX plus radiotherapy in squamous cell carcinoma of the head and neck into
Europe, South Africa, Israel, Australia and New Zealand. In order to support
these clinical trials, Merck KGaA has agreed to purchase ERBITUX manufactured by
Lonza for use in these trials and further agreed to reimburse the Company for
one-half of the outside contract service costs incurred with respect to this
Phase III clinical trial of ERBITUX for the treatment of head and neck cancer in
combination with radiation. Amounts due from Merck KGaA related to these
agreements totaled approximately $6,381,000 and $1,503,000 at March 31, 2002 and
December 31, 2001, respectively, and are included in amounts due from corporate
partners in the consolidated balance sheets. The Company has incurred
reimbursable research and development expenses totaling approximately $5,022,000
and $3,129,000 in the three months ended March 31, 2002, and 2001, respectively.
These amounts have been recorded as research and development expenses and also
as collaborative agreement revenue in the consolidated statements of operations.

         Reimbursable costs associated with supplying ERBITUX to Merck KGaA for
use in clinical trials totaled approximately $4,309,000 during the three months
ended March 31, 2002 and are included in collaborative agreement revenue in the
consolidated statements of operations. The related manufacturing costs, except
for cost incurred under the 2,000L Lonza Agreement, have been expensed in prior
periods when the related raw materials were purchased and the associated direct
labor and overhead was consumed or, in the case of contract manufacturing, when
such services were performed.

(b)  BRISTOL-MYERS SQUIBB COMPANY

         On September 19, 2001, the Company entered into an acquisition
agreement (the "Acquisition Agreement") with BMS and Bristol-Myers Squibb
Biologics Company, a Delaware corporation ("BMS Biologics") which is a
wholly-owned subsidiary of BMS, providing for the tender offer by BMS Biologics
to purchase up to 14,392,003 shares of the Company's common stock for $70.00 per
share, net to the seller in cash. In connection with the Acquisition Agreement,
the Company entered into a stockholder agreement with BMS and BMS Biologics,
dated as of September 19, 2001 (the "Stockholder Agreement"), pursuant to which
all parties agreed to various arrangements regarding the respective rights and
obligations of each party with respect to, among other things, the ownership of
shares of the Company's common stock by BMS and BMS Biologics. Concurrent with
the execution of the Acquisition Agreement and the Stockholder Agreement, the
Company entered into a development, distribution and supply agreement (the
"Commercial Agreement") with BMS and its wholly-owned subsidiary E.R. Squibb &
Sons, L.L.C. ("E.R. Squibb"), relating to ERBITUX, pursuant to which, among
other things, the Company is co-developing and co-promoting ERBITUX in the
United States and Canada, and co-developing ERBITUX (together with Merck KGaA)
in Japan.

         On October 29, 2001, pursuant to the Acquisition Agreement, BMS
Biologics accepted for payment pursuant to the tender offer 14,392,003 shares of
the Company's common stock on a pro rata basis from all tendering shareholders
and those conditionally exercising stock options.

         On March 5, 2002, the Company amended the Commercial Agreement with
E.R. Squibb and BMS. The amendment changed certain economics of the Commercial
Agreement and has expanded the clinical and strategic role of BMS in the ERBITUX
development program. One of the principal economic changes to the Commercial
Agreement is that the Company received $140,000,000 on March 7, 2002 and an
additional payment of $60,000,000 is payable on March 5, 2003. Such payments are
in lieu of the $300,000,000 milestone payment the Company would have received
under the original terms of the agreement upon acceptance by the FDA of the
ERBITUX rolling Biologic License Application submitted for marketing approval to
treat irinotecan-refractory colorectal cancer. In addition, the Company agreed
to resume construction of its second commercial manufacturing facility as soon
as reasonably practicable after the execution of the amendment.

         In exchange for the rights granted to BMS under the amended Commercial
Agreement, the Company can receive up-front and milestone payments totaling
$900,000,000 in the aggregate, of which $200,000,000 was received on


                                     Page 8
<PAGE>

September 19, 2001, $140,000,000 was received on March 7, 2002, $60,000,000 is
payable on March 5, 2003, $250,000,000 is payable upon receipt of marketing
approval from the FDA with respect to an initial indication for ERBITUX and
$250,000,000 is payable upon receipt of marketing approval from the FDA with
respect to a second indication for ERBITUX. All such payments are non-refundable
and non-creditable. Payments received under the amended Commercial Agreement
with BMS and E.R. Squibb are being deferred and recognized as revenue based on
the percentage of actual product research and development costs incurred to date
by both BMS and the Company to the estimated total of such costs to be incurred
over the term of the agreement. Except for the Company's expenses incurred
pursuant to a co-promotion option, E.R. Squibb is also responsible for 100% of
the distribution, sales and marketing costs in the United States and Canada, and
as between the Company and E.R. Squibb, each party will be responsible for 50%
of the distribution, sales, and marketing costs and other related costs and
expenses in Japan. The Commercial Agreement provides that E.R. Squibb shall pay
the Company a 39% distribution fee on net sales of ERBITUX by E.R. Squibb in the
United States and Canada. The Commercial Agreement also provides that the
distribution fees for the sale of ERBITUX in Japan by E.R. Squibb or the Company
shall be equal to 50% of operating profit or loss with respect to such sales for
any calendar month. In the event of an operating profit, E.R. Squibb will pay
the Company the amount of such distribution fee, and in the event of an
operating loss, the Company will credit E.R. Squibb the amount of such
distribution fee. The Commercial Agreement provides that the Company will be
responsible for the manufacture and supply of all requirements of ERBITUX in
bulk form for clinical and commercial use in the United States, Canada and Japan
and that E.R. Squibb will purchase all of its requirements of ERBITUX in bulk
form for commercial use from the Company. The Company will supply ERBITUX for
clinical use at the Company's fully burdened manufacturing cost, and will supply
ERBITUX for commercial use at the Company's fully burdened manufacturing cost
plus a mark-up of 10%. In addition to the up-front and milestone payments, the
distribution fees for the United States, Canada and Japan and the 10% mark-up on
the commercial supply of ERBITUX, E.R. Squibb is also responsible for 100% of
the cost of all clinical studies other than those studies undertaken post-launch
which are not pursuant to an Investigational New Drug Application ("INDA") (e.g.
phase IV studies), the cost of which will be shared equally between E.R. Squibb
and the Company. As between E.R. Squibb and the Company, each will be
responsible for 50% of the cost of all clinical studies in Japan.

         Unless earlier terminated pursuant to the termination rights discussed
below, the Commercial Agreement expires with regard to the Product in each
country in the Territory on the later of September 19, 2018 and the date on
which the sale of the Product ceases to be covered by a validly issued or
pending patent in such country. The Commercial Agreement may also be terminated
prior to such expiration as follows:

         o        by either party, in the event that the other party materially
                  breaches any of its material obligations under the Commercial
                  Agreement and has not cured such breach within 60 days after
                  notice;

         o        by E.R. Squibb, if the joint executive committee (the "JEC")
                  formed by BMS and the Company determines that there exists a
                  significant concern regarding a regulatory or patient safety
                  issue that would seriously impact the long-term viability of
                  all products; or

         o        by either party, in the event that the JEC does not approve
                  additional clinical studies that are required by the FDA in
                  connection with the submission of the initial regulatory
                  filing with the FDA within 90 days of receiving the formal
                  recommendation of the product development committee concerning
                  such additional clinical studies.

         The Company incurred approximately $2,250,000 during the three months
ended March 31, 2002 in advisor fees associated with the amendment to the
Commercial Agreement with BMS and affiliates which have been expensed and
included as a separate line item in operating expenses in the consolidated
statement of operations.

         In connection with the amended Commercial Agreement the Company
incurred and recorded reimbursable research and development and marketing
expenses totaling approximately $4,248,000 in the three months ended March 31,
2002. These amounts have also been recorded as collaborative agreement revenue
for the three months ended March 31, 2002 in the consolidated statements of
operations.

         Reimbursable costs associated with ERBITUX used in clinical trials
totaled approximately $1,847,000 during the three months ended March 31, 2002
and are included in collaborative agreement revenue in the consolidated
statement of operations. The related manufacturing costs have been expensed in
prior periods when the related raw materials were purchased and the associated
direct labor and overhead was consumed or, in the case of contract
manufacturing, when such services were provided.


                                     Page 9
<PAGE>


License fees and milestone revenues consists of the following:
<TABLE>
<CAPTION>

                                                                                               THREE MONTHS ENDED
                                                                                                    MARCH 31,
                                                                                      -----------------------------------
                                                                                              2002             2001
                                                                                      -----------------  ----------------

<S>                                                                                    <C>               <C>
BMS ERBITUX license fee revenue...................................................     $     6,567,000   $             --
Merck KGaA ERBITUX milestone revenue..............................................                  --         24,000,000
Merck KGaA ERBITUX and BEC2 license fee revenue...................................              96,000             96,000
                                                                                       ---------------   ----------------
   Total license fees and milestone revenues......................................     $     6,663,000   $     24,096,000
                                                                                       ===============   ================
</TABLE>

Collaborative agreement revenue (see note 1) from corporate partners consists of
the following:

<TABLE>
<CAPTION>
                                                                                              THREE MONTHS ENDED
                                                                                                    MARCH 31,
                                                                                      -----------------------------------
                                                                                              2002             2001
                                                                                      -----------------  ----------------

<S>                                                                                    <C>               <C>
BMS reimbursement of ERBITUX research and development ($5,952,000)
   and marketing ($143,000) expenses..............................................     $     6,095,000   $             --
Merck KGaA reimbursement of ERBITUX research and development expenses.............             713,000          2,099,000
Merck KGaA reimbursement of ERBITUX product costs
    for use in clinical trials....................................................           4,309,000          1,030,000
Merck KGaA reimbursement of BEC2 research and development expenses................             121,000            122,000
                                                                                       ---------------   ----------------
   Total collaborative agreement revenue..........................................     $    11,238,000   $      3,251,000
                                                                                       ===============   ================
</TABLE>

Amounts due from corporate partners consist of the following:

<TABLE>
<CAPTION>
                                                                                          MARCH 31,       DECEMBER 31,
                                                                                            2002               2001
                                                                                      -----------------  ----------------

<S>                                                                                    <C>               <C>
Due from BMS, ERBITUX research and development
   and marketing expenses.........................................................     $     6,130,000   $      6,714,000
Due from Merck KGaA, ERBITUX research and development expenses....................           2,083,000            666,000
Due from Merck KGaA, reimbursement of ERBITUX product costs for use
   in clinical trials.............................................................           4,298,000            837,000
Due from Merck KGaA, BEC2 research and development expenses.......................             121,000             13,000
                                                                                       ---------------   ----------------
   Total amounts due from corporate partners......................................     $    12,632,000   $      8,230,000
                                                                                       ===============   ================
</TABLE>

Deferred revenue consists of the following:

<TABLE>
<CAPTION>
                                                                                          MARCH 31,       DECEMBER 31,
                                                                                            2002               2001
                                                                                      -----------------  ----------------
<S>                                                                                    <C>               <C>
BMS, ERBITUX Commercial Agreement.................................................     $   330,881,000   $    197,447,000
Merck KGaA, ERBITUX development and license agreement.............................           3,722,000          3,778,000
Merck KGaA, BEC2 development and commercialization agreement......................           2,231,000          2,271,000
                                                                                       ---------------   ----------------
                                                                                           336,834,000        203,496,000
Less: current portion.............................................................         (35,760,000)       (20,683,000)
                                                                                       ----------------  -----------------
                                                                                       $   301,074,000   $    182,813,000
                                                                                       ===============   ================
</TABLE>

(8)   CONTINGENCIES

         The Company and certain of its officers and directors are named as
defendants in a number of complaints filed on behalf of purported classes of its
stockholders asserting claims under Section 10(b) of the Securities and Exchange
Act of 1934 (the "Exchange Act"), Rule 10b-5 promulgated thereunder and

                                    Page 10
<PAGE>
Section 20(a) of the Exchange Act. A motion is pending that will result in the
consolidation of these and any subsequently-filed actions that assert similar
claims. The complaints in these actions allege generally that various public
statements made by the Company or its senior officers during 2001 and early 2002
regarding the prospects for FDA approval of ERBITUX were false or misleading
when made, that various Company insiders were aware of material, non-public
information regarding the actual prospects for ERBITUX at the time that those
insiders engaged in transactions in the Company's common stock and that members
of the purported shareholder class suffered damages when the market price of the
Company's common stock declined following disclosure of the information that
allegedly had not been previously disclosed. On December 28, 2001, the Company
disclosed that it had received a "refusal to file" letter from the FDA relating
to its biologics license application for ERBITUX. Thereafter, various news
articles purported to describe the contents of the FDA's "refusal to file"
letter. During this period, the market price of the Company's common stock
declined. The complaints in the various actions seek to proceed on behalf of a
class of the Company's present and former stockholders, other than defendants or
persons affiliated with the defendants, seek monetary damages in an unspecified
amount and seek recovery of plaintiffs' costs and attorneys' fees.

         Beginning on January 13, 2002 and continuing thereafter, eight separate
purported stockholders derivative actions have been filed against the members of
its board of directors and the Company, as nominal defendant, making allegations
similar to the allegations in the federal securities class action complaints.
All of these actions assert claims, purportedly on the Company's behalf, for
breach of fiduciary duty by certain members of the board of directors based on
the allegation that certain directors engaged in transactions in the Company's
common stock while in possession of material, non-public information concerning
the regulatory and marketing prospects for ERBITUX. Another complaint,
purportedly asserting direct claims on behalf of a class of the Company's
shareholders but in fact asserting derivative claims that are similar to those
asserted in these six cases, was filed in the U.S. District Court for the
Southern District of New York on February 13, 2002, styled Dunlap v. Waksal, et
al., No. 02 Civ. 1154 (RO). The Dunlap complaint asserts claims against the
board of directors for breach of fiduciary duty purportedly on behalf of all
persons who purchased shares of the Company's common stock prior to June 28,
2001 and then held those shares through December 6, 2001. It alleges that the
members of the purported class suffered damages as a result of holding their
shares based on allegedly false information about the financial prospects of the
Company that was disseminated during this period.

         All of these actions are in their earliest stages and a reserve has
not been established in the accompanying consolidated financial statements
because the Company does not believe at this time that a loss is probable. The
Company intends to contest vigorously the claims asserted in these actions.

         The Company has incurred legal fees associated with these matters
totaling approximately $3,279,000 during the three months ended March 31, 2002.
In addition, the Company has estimated and recorded a receivable totaling
$1,639,000 for a portion of the above mentioned legal fees that the Company
believes are recoverable from its insurance carriers. This receivable is
included in other assets in the consolidated balance sheet at March 31, 2002.

         The Company has received subpoenas and requests for information in
connection with investigations by the Securities and Exchange Commission, the
Subcommittee on Oversight and Investigations of the U.S. House of
Representatives Committee on Energy and Commerce and the U.S. Department of
Justice relating to the circumstances surrounding the disclosure of the FDA
letter dated December 28, 2001 and trading in the Company's securities by
certain Company insiders in 2001. The Company is cooperating with all of these
inquiries and intends to continue to do so.

(9)   CERTAIN RELATED PARTY TRANSACTIONS

         In September 2001 and February 2002, the Company entered into
employment agreements with six senior executive officers, including the Chief
Executive Officer and Chief Operating Officer. The September agreements each
have three-year terms and the February agreement has a one-year term. The term
of employment for each of the CEO and COO will be automatically extended for one
additional day each day during the term of employment unless either the Company
or the Executive otherwise gives notice. The employment agreements provide for a
stated base salaries, and minimum bonuses and benefits aggregating $3,765,000
annually.

         Certain transactions engaged in by the Company's Chief Executive
Officer, Dr. Samuel Waksal, in securities of the Company were deemed to have
resulted in "short-swing profits" under Section 16 of the Securities Exchange
Act of 1934 (the "Exchange Act"). In accordance with Section 16(b) of the
Exchange Act, Dr. Waksal has paid the Company an aggregate amount

                                    Page 11

<PAGE>


of approximately $486,000, in March 2002, as disgorgement of "short-swing
profits" he realized. This amount was recorded as an increase to additional
paid-in capital.

(10)  STOCKHOLDER RIGHTS PLAN

         On February 15, 2002, the Company's Board of Directors approved a
Stockholder Rights Plan and declared a dividend of one right for each share of
our common stock outstanding at the close of business on February 19, 2002. In
connection with the Board of Directors approval of the stockholders rights plan
Series B Participating Cumulative Preferred Stock was created. Under certain
conditions, each right entitles the holder to purchase from the Company
one-hundredth of a share of series B Participating Cumulative Preferred Stock at
an initial purchase price of $175 per share. The Stockholder Rights Plan is
designed to enhance the Board's ability to protect stockholders against, among
other things, unsolicited attempts to acquire control of the Company which do
not offer an adequate price to all of the Company's stockholders or are
otherwise not in best interests of the Company and the Company's stockholders.

         Subject to certain exceptions, rights become exercisable (i) on the
tenth day after public announcement that any person, entity, or group of persons
or entities has acquired ownership of 15% or more of the Company's outstanding
common stock, or (ii) 10 business days following the commencement of a tender
offer or exchange offer by any person which would, if consummated, result in
such person acquiring ownership of 15% or more of the Company's outstanding
common stock, (collectively an "Acquiring Person").

         In such event, each right holder will have the right to receive the
number of shares of common stock having a then current market value equal to two
times the aggregate exercise price of such rights. If the Company were to enter
into certain business combination or disposition transactions with an Acquiring
Person, each right holder will have the right to receive shares of common stock
of the acquiring company having a value equal to two times the aggregate
exercise price of the rights.

         The Company may redeem these rights in whole at a price of $.001 per
right. The rights expire on February 15, 2012.

ITEM 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
         RESULTS OF OPERATIONS

         The following discussion and analysis by our management is provided to
identify certain significant factors that affected our financial position and
operating results during the periods included in the accompanying financial
statements.

CRITICAL ACCOUNTING POLICIES

         During January 2002, the Securities and Exchange Commission ("SEC")
published a Commission Statement in the form of Financial Reporting Release No.
61 which requested that all registrants discuss their most "critical accounting
policies" in management's discussion and analysis of financial condition and
results of operations. The SEC has defined critical accounting policies as those
that are both important to the portrayal of a company's financial condition and
results, and that require management's most difficult, subjective or complex
judgments, often as a result of the need to make estimates about the effect of
matters that are inherently uncertain. While our significant accounting policies
are summarized in Note 2 to our consolidated financial statements included in
Form 10-K for the fiscal year ended December 31, 2001, we believe the following
accounting policies to be critical:

         Revenue - We adopted Staff Accounting Bulletin No. 101 ("SAB 101") in
the fourth quarter of 2000 with an effective date of January 1, 2000,
implementing a change in accounting policy with respect to revenue recognition.
Beginning January 1, 2000, non-refundable fees received upon entering into
collaborative agreements where the Company has continuing involvement are
recorded as deferred revenue and recognized over the estimated service period.

         Payments received under the development, promotion, distribution and
supply agreement (the "Commercial Agreement") dated September 19, 2001 and as
amended on March 5, 2002 with Bristol-Myers Squibb Company ("BMS") and E.R.
Squibb & Sons, L.L.C., a Delaware limited liability company and a wholly-owned
subsidiary of BMS ("E.R. Squibb"), relating to ERBITUX, are being deferred and
recognized as revenue based upon the actual product research and development
costs incurred to date by BMS,

                                    Page 12
<PAGE>


E.R. Squibb and ImClone Systems as a percentage of the estimated total of such
costs to be incurred over the term of the agreement. Of the $340,000,000 upfront
payments we received from BMS through March 31, 2002, approximately $6,567,000
was recognized as revenue during the three months ended March 31, 2002 and
$9,120,000 from the commencement of the agreement through March 31, 2002.

         The methodology used to recognize revenue deferred involves a number of
estimates and judgments, such as the estimate of total product research and
development costs to be incurred under the Commercial Agreement. Changes in
these estimates and judgments can have a significant effect on the size and
timing of revenue recognition.

         Non-refundable milestone payments, which represent the achievement of a
significant step in the research and development process, pursuant to
collaborative agreements, other than the Commercial Agreement with BMS, are
recognized as revenue upon the achievement of the specified milestone.

         Litigation - We are currently involved in certain legal proceedings as
discussed in "Contingencies" Note 8 to the financial statements. In accordance
with Statement of Financial Accounting Standards No. 5, no legal reserve has
been established in our financial statements for these matters because we do not
believe at this time that a loss is probable. However, if we deem it probable
that an unfavorable ruling in any such legal proceeding will occur, there exists
the possibility of a material adverse impact on the operating results of that
period.

         Long-Lived Assets - We review long-lived assets for impairment when
events or changes in business conditions indicate that their full carrying value
may not be recovered. Assets are considered to be impaired and written down to
fair value if expected associated undiscounted cash flows are less than carrying
amounts. Fair value is generally the present value of the expected associated
cash flows. We recently built a product launch manufacturing facility and are
building a second commercial manufacturing facility which are summarized in Note
2 to the financial statements. The product launch manufacturing facility is
dedicated to the clinical and commercial production of ERBITUX and the second
commercial manufacturing facility will be a multi-use production facility.
ERBITUX is currently being produced for clinical trials and potential
commercialization. We believe that ERBITUX will ultimately be approved for
commercialization. As such, we believe that the full carrying value of both the
product launch manufacturing facility and the second commercial manufacturing
facility will be recovered. Changes in business conditions in the future could
change our judgments about the carrying value of these facilities which could
result in the recognition of material impairment losses.

         Manufacturing Contracts - As summarized under "Manufacturing Contract
Services," Note 3 to the financial statements, we have entered into certain
development and manufacturing services agreements with Lonza Biologics plc
("Lonza") for the clinical and commercial production of ERBITUX. We have
commitments from Lonza to manufacture ERBITUX at the 5,000 liter scale through
December 2003. On March 31, 2002, the estimated remaining future commitments
under the amended commercial manufacturing services agreement with Lonza were
$45,522,000 in 2002 and $24,050,000 in 2003. If ERBITUX were not to receive
regulatory approval when anticipated it is possible that a liability would need
to be recognized for any remaining commitments to Lonza.

         Valuation of Stock Options - We apply APB Opinion No. 25 and related
interpretations in accounting for our stock options and warrants. Accordingly,
compensation expense is recorded on the date of grant of an option to an
employee or member of the Board of Directors only if the fair market value of
the underlying stock at the time of grant exceeds the exercise price. In
addition, we have granted options to certain Scientific Advisory Board members
and outside consultants, which are required to be measured at fair value.
Estimating the fair value of stock options and warrants involves a number of
judgments

                                    Page 13


<PAGE>


and variables that are subject to significant change. A change in the fair value
estimate could have a significant effect on the amount of compensation expense
recognized.

         Production Costs - The costs associated with the manufacture of ERBITUX
are included in research and development expenses when incurred and will
continue to be so classified until such time as ERBITUX may be approved for sale
or until we obtain obligations from our corporate partners for supply of such
product. In the event of such approval or obligations from our corporate
partners, the subsequent costs associated with manufacturing ERBITUX for
commercial sale will be included in inventory and expensed as cost of goods sold
when sold. If ERBITUX is approved by the United States Food and Drug
Administration ("FDA"), any subsequent sale of this inventory, previously
expensed, will result in revenue from product sales with no corresponding cost
of goods sold.

                              RESULTS OF OPERATIONS

THREE MONTHS ENDED MARCH 31, 2002 AND 2001.

Revenues

         Revenues for the three months ended March 31, 2002 and 2001 were
$18,551,000 and $27,995,000, respectively, a decrease of $9,444,000, or 34% in
2002. Revenues for the three months ended March 31, 2002 primarily included
$6,567,000 in license fee revenue and $6,095,000 in collaborative agreement
revenue from our amended ERBITUX Commercial Agreement with BMS and its
wholly-owned subsidiary, E.R. Squibb. The collaborative agreement revenue is a
reimbursement of certain research and development and marketing expenses as
provided for in the amended Commercial Agreement. License fee revenue from
payments under this agreement (of which $140,000,000 was received in 2002 and
$200,000,000 was received in 2001) are being recognized over the product
research and development life of ERBITUX. An additional $60,000,000 is payable
on March 5, 2003, $250,000,000 is payable upon receipt of marketing approval
from the FDA with respect to an initial indication for ERBITUX and $250,000,000
is payable upon receipt of marketing approval from the FDA with respect to a
second indication for ERBITUX. All such payments are non-refundable and
non-creditable. We also recognized $5,022,000 in collaborative agreement revenue
from our ERBITUX development and license agreement with Merck KGaA. In addition,
we recognized $55,000 of the $4,000,000 up-front payment received upon entering
into the ERBITUX development and license agreement with Merck KGaA. This revenue
is being recognized ratably over the anticipated life of the agreement. Revenues
for the three months ended March 31, 2002 also included $650,000 in royalty
revenue from our strategic corporate alliance with Abbott Laboratories
("Abbott") in diagnostics and $41,000 in license fee revenue and $121,000 in
collaborative agreement revenue from our strategic corporate alliance with Merck
KGaA for our principal cancer vaccine product candidate, BEC2. Revenues for the
three months ended March 31, 2001 primarily included $24,000,000 in milestone
revenue and $3,129,000 in collaborative agreement revenue from our ERBITUX
development and license agreement with Merck KGaA. These milestone payments were
received in prior periods and were originally recorded as fees potentially
refundable to corporate partner because they were refundable in the event a
condition relating to obtaining certain collateral license agreements was not
satisfied. This condition was satisfied in March 2001. In addition, we
recognized $55,000 of the $4,000,000 up-front payment received upon entering
into this agreement. This revenue is being recognized ratably over the
anticipated life of the agreement. Revenues for the three months ended March 31,
2001 also included $648,000 in royalty revenue from our strategic corporate
alliance with Abbott in diagnostics and $41,000 in license fee revenues and
$122,000 of collaborative agreement revenue from our strategic corporate
alliance with Merck KGaA for BEC2.

OPERATING EXPENSES:

         Total operating expenses for the three months ended March 31, 2002 and
2001 were $48,151,000 and $28,824,000, respectively, an increase of $19,327,000,
or 67% in 2002. Operating expenses for the three months ended March 31, 2002
included a $2,250,000 advisor fee associated with completing the amended
Commercial Agreement.

Operating Expenses:  Research and Development

         Research and development expenses for the three months ended March 31,
2002 and 2001 were $37,778,000 and $25,096,000, respectively, an increase of
$12,682,000 or 51% in 2002. Research and development expenses for the three
months ended March 31, 2002 and 2001 as a percentage of total operating
expenses, excluding the advisor fee associated with the

                                    Page 14


<PAGE>


amended Commercial Agreement in the three months ended March 31, 2002, were
82% and 87%, respectively. Research and development expenses include costs
associated with our in-house and collaborative research programs, product and
process development expenses, costs to manufacture our product candidates,
particularly ERBITUX, prior to any approval that we may obtain of a product
candidate for commercial sale or obligations of our corporate partners to
acquire product from us, quality assurance and quality control costs, and costs
to conduct our clinical trials and associated regulatory activities. Research
and development expenses include costs that are reimbursable by our corporate
partners. The increase in research and development expenses for the three months
ended March 31, 2002 was primarily attributable to (1) the costs associated with
full scale production at our product launch manufacturing facility, (2) costs
related to the manufacturing services agreements with Lonza, (3) expenditures in
the functional areas of product development, and pilot plant manufacturing
associated with ERBITUX and (4) increased expenditures associated with discovery
research. We expect research and development costs to increase in future periods
as we continue to manufacture ERBITUX prior to any approval of the product that
we may obtain for commercial use or until we receive committed purchase
obligations of our corporate partners. In the event of such approval or
committed purchase obligations from our corporate partners, the subsequent costs
associated with manufacturing ERBITUX for supply to E.R. Squibb for commercial
use will be included in inventory and expensed as cost of goods sold when sold.
We expect research and development costs associated with discovery research and
product development also to continue to increase in future periods.

Operating Expenses: Marketing, General and Administrative

         Marketing, general and administrative expenses include marketing and
administrative personnel costs, including related occupancy costs, additional
costs to develop internal marketing and sales capabilities, costs to pursue
arrangements with strategic corporate partners and technology licensors, and
expenses associated with applying for patent protection for our technology and
products. Marketing, general and administrative expenses include amounts
reimbursable from our corporate partner. Marketing, general and administrative
expenses for the three months ended March 31, 2002 and 2001 were $8,123,000 and
$3,728,000, respectively, an increase of $4,395,000, or 118% in 2002. The
increase in marketing, general and administrative expenses primarily reflected
(1) legal expenses associated with the pending class action lawsuits,
shareholder derivative lawsuits and investigations by the SEC, the Subcommittee
on Oversight and Investigation of the U.S. House of Representatives Committee on
Energy and Commerce and the U.S. Department of Justice, (2) costs associated
with our marketing efforts, (3) additional administrative staffing required to
support our commercialization efforts for ERBITUX and (4) expenses associated
with general corporate activities. Other than the legal expenses component
discussed in (1) above, whose level in the future is uncertain because it
depends upon the matter in which these investigations and proceedings progress,
we expect marketing, general and administrative expenses to increase in future
periods to support our continued commercialization efforts for ERBITUX.

Interest Income, Interest Expense and Other (Income) Expense

         Interest income was $2,264,000 for the three months ended March 31,
2002 compared with $4,565,000 for the three months ended March 31, 2001, a
decrease of $2,301,000, or 50% in 2002. The decrease was primarily attributable
to a decrease in interest rates associated with our portfolio of debt
securities. Interest expense was $3,492,000 and $3,313,000 for the three months
ended March 31, 2002 and 2001, respectively, an increase of $179,000 or 5% in
2002. Interest expense for the three months ended March 31, 2002 and 2001 was
offset by the capitalization of interest costs of $300,000 and $494,000,
respectively, during the construction period of our product launch manufacturing
facility and a second commercial manufacturing facility for which design,
engineering, and pre-construction costs have been incurred. Interest expense for
both periods included (1) interest on the 5 1/2% convertible subordinated notes
due March 1, 2005 (the "Convertible Subordinated Notes") issued in February
2000, (2) interest on an outstanding Industrial Development Revenue Bond issued
in 1990 (the "1990 IDA Bond") with a principal amount of $2,200,000 and (3)
interest recorded on various capital lease obligations under a 1996 financing
agreement and a 1998 financing agreement with Finova Technology Finance, Inc.
("Finova"). We recorded gains on securities and investments of $801,000 and
losses of $1,618,000 for the three months ended March 31, 2002 and 2001,
respectively. The losses on securities and investments for the three months
ended March 31, 2001 included a $1,600,000 write-down of our investment in
ValiGen N.V.

Net Losses

         We had a net loss of $30,027,000 or $0.41 per share for the three
months ended March 31, 2002, compared with a net loss of $1,195,000 or $0.02 per
share for the three months ended March 31, 2001. The increase in the net losses
and per share net



                                    Page 15

<PAGE>

loss to common stockholders was due to the factors noted above.

LIQUIDITY AND CAPITAL RESOURCES

         At March 31, 2002, our principal sources of liquidity consisted of cash
and cash equivalents and securities available for sale of approximately
$415,000,000. From our inception on April 26, 1984 through March 31, 2002, we
have financed our operations primarily through the following means:

         o        Public and private sales of equity securities and convertible
                  notes in financing transactions have raised approximately
                  $492,652,000 in net proceeds

         o        We have earned approximately $97,966,000 from license fees,
                  contract research and development fees, reimbursements from
                  our corporate partners and royalties from collaborative
                  partners. Additionally, we have approximately $336,834,000 in
                  deferred revenue related to up-front payments received from
                  our amended Commercial Agreement for ERBITUX, our ERBITUX
                  development and license agreement with Merck KGaA and our BEC2
                  development and commercialization agreement with Merck KGaA.
                  These amounts are being recognized as revenue over the
                  expected lives of the respective agreements

         o        We have earned approximately $49,378,000 in interest income

         o        The sale of the IDA Bonds in each of 1985, 1986 and 1990
                  raised an aggregate of $6,300,000, the proceeds of which have
                  been used for the acquisition, construction and installation
                  of our research and development facility in New York City, and
                  of which $2,200,000 is outstanding

         We may, from time to time, consider a number of strategic alternatives
designed to increase shareholder value, which could include joint ventures,
acquisitions and other forms of alliances, as well as the sale of all or part of
the Company.

         Until September 19, 2006, or earlier upon the occurrence of certain
specified events, we may not take any action that constitutes a prohibited
action under our stockholder agreement with BMS and Bristol-Meyers Squibb
Biologics Company, a Delaware corporation ("BMS Biologics") which is a
wholly-owned subsidiary of BMS, without the consent of the BMS directors. Such
prohibited actions include (i) issuing additional shares or securities
convertible into shares in excess of 21,473,002 shares of our common stock in
the aggregate, subject to certain exceptions; (ii) incurring additional
indebtedness if the total of the principal amount of such indebtedness incurred
since September 19, 2001 and then-outstanding, and the net proceeds from the
issuance of any redeemable preferred stock then-outstanding, would exceed the
amount of indebtedness outstanding as of September 19, 2001 by more than $500
million; (iii) acquiring any business if the aggregate consideration for such
acquisition, when taken together with the aggregate consideration for all other
acquisitions consummated during the previous twelve months, is in excess of 25%
of the aggregate value of the Company at the time we enter into the binding
agreement relating to such acquisition; (iv) disposing of all or any substantial
portion of our non-cash assets; (v) issuing capital stock with more than one
vote per share.

         In September 2001, we entered into a commercial agreement with BMS and
its wholly-owned subsidiary, E.R. Squibb, relating to ERBITUX, pursuant to
which, among other things, together with E.R Squibb we are (a) co-developing and
co-promoting ERBITUX in the United States and Canada, and (b) co-developing
ERBITUX (together with Merck KGaA) in Japan. The commercial agreement was
amended on March 5, 2002 to change certain economics of the agreement and has
expanded the clinical and strategic roles of BMS in the ERBITUX development
program. Pursuant to the amended commercial agreement, we can receive up-front
and milestone payments totaling $900,000,000 in the aggregate, of which
$200,000,000 was received upon the signing of the agreement. The remaining
$700,000,000 in payments comprises $140,000,000 paid on March 7, 2002,
$60,000,000 payable on March 5, 2003, $250,000,000 payable upon receipt of
marketing approval from the FDA with respect to an initial indication for
ERBITUX and $250,000,000 payable upon receipt of marketing approval from the FDA
with respect to a second indication for ERBITUX. All such payments are
non-refundable and non-creditable. Except for our expenses incurred pursuant to
the co-promotion option, E.R. Squibb is responsible for 100% of the
distribution, sales and marketing costs in the United States and Canada, and
E.R. Squibb and the Company, each will be responsible for 50% of the
distribution, sales, marketing costs and other related costs and expenses in
Japan. The commercial agreement provides that E.R. Squibb shall pay us
distribution fees based on a percentage of annual sales of ERBITUX by E.R.
Squibb in the United States and Canada. The distribution fee is 39% of net sales
in the United


                                    Page 16

<PAGE>


States and Canada. The commercial agreement also provides that the distribution
fees for the sale of ERBITUX in Japan by E.R. Squibb or us shall be equal to 50%
of operating profit or loss with respect to such sales for any calendar month.
In the event of an operating profit, E.R. Squibb will pay us the amount of such
distribution fee, and in the event of an operating loss, we will credit E.R.
Squibb the amount of such distribution fee. The commercial agreement provides
that we will be responsible for the manufacture and supply of all requirements
of ERBITUX in bulk form for clinical and commercial use in the United States,
Canada and Japan and that E.R. Squibb will purchase all of its requirements of
ERBITUX in bulk form for commercial use from us. We will supply ERBITUX for
clinical use at our fully burdened manufacturing cost, and will supply ERBITUX
for commercial use at our fully burdened manufacturing cost plus a mark-up of
10%. In addition to the up-front and milestone payments, the distribution fees
for the United States, Canada and Japan and the 10% mark-up on the commercial
supply of ERBITUX, E.R. Squibb is also responsible for 100% of the cost of all
clinical studies other than those studies undertaken post-launch, which are not
pursuant to an Investigational New Drug Application ("INDA") (e.g., phase IV
studies), the cost of which will be shared equally between E.R. Squibb and
ImClone Systems. As between E.R. Squibb and the Company, each will each be
responsible for 50% of the cost of all clinical studies in Japan.

         In February 2000, we completed a private placement of $240,000,000 in
5-1/2% convertible subordinated notes due March 1, 2005. We received net
proceeds of approximately $231,500,000, after deducting expenses associated with
the offering. Accrued interest on the notes was approximately $1,100,000 at
March 31, 2002. A holder may convert all or a portion of a note into common
stock at any time on or before March 1, 2005 at a conversion price of $55.09 per
share, subject to adjustment under certain circumstances. We may redeem some or
all of the notes prior to March 6, 2003 if specified common stock price
thresholds are met. On or after March 6, 2003, we may redeem some or all of the
notes at specified redemption prices.

         In December 1999, we entered into a development and manufacturing
services agreement with Lonza. This agreement was amended in April 2001 to
include additional services. Under the agreement, Lonza is responsible for
process development and scale-up to manufacture ERBITUX in bulk form under
current Good Manufacturing Practices ("cGMP") conditions. These steps were taken
to assure that the manufacturing process would produce bulk material that
conforms with our reference material and to support in part, our regulatory
filing with the FDA. As of March 31, 2002, we had incurred approximately
$7,068,000 for services provided under the development and manufacturing
services agreement. In September 2000, we entered into a three-year commercial
manufacturing services agreement with Lonza relating to ERBITUX. This agreement
was amended in June 2001 and again in September 2001 to include additional
services. As of March 31, 2002, we had incurred approximately $17,383,000 for
services provided under the commercial manufacturing services agreement. Under
these two agreements, Lonza is manufacturing ERBITUX at the 5,000 liter scale
under cGMP conditions and is delivering it to us over a term ending no later
than December 2003. The costs associated with both of these agreements are
included in research and development expenses when incurred and will continue to
be so classified until such time as ERBITUX may be approved for sale or until we
obtain obligations from our corporate partners for supply of such product. In
the event of such approval or obligations from our corporate partners, the
subsequent costs associated with manufacturing ERBITUX for commercial sale will
be included in inventory and expensed as cost of goods sold when sold. In the
event we terminate (i.e., the cancellation of batches of bulk product) the
commercial manufacturing services agreement without cause, we will be required
to pay 85% of the stated costs for each of the first ten batches cancelled, 65%
of the stated costs for each of the next ten batches cancelled and 40% of the
stated costs for each of the next six batches cancelled. The batch cancellation
provisions for certain additional batches that we are committed to purchase
require us to pay 100% of the stated costs of cancelled batches scheduled within
six months of the cancellation, 85% of the stated costs of cancelled batches
scheduled between six and twelve months following the cancellation and 65% of
the stated costs of cancelled batches scheduled between twelve and eighteen
months following the cancellation. These amounts are subject to mitigation
should Lonza use its manufacturing capacity caused by such termination for
another customer. At March 31, 2002, the estimated remaining future commitments
under the amended commercial manufacturing services agreement are $45,522,000 in
2002 and $24,050,000 in 2003.

         In December 2001, we entered into an agreement with Lonza to
manufacture ERBITUX at the 2,000 liter scale for use in clinical trials by Merck
KGaA. We had incurred approximately $4,245,000 for services provided under this
agreement, of which $2,350,000 was reimbursed by Merck KGaA. The remaining
$1,895,000 that is due from Merck KGaA is included in amounts due from corporate
partners in the consolidated balance sheet at March 31, 2002. At March 31, 2002,
the estimated remaining future commitments under this agreement is $2,938,000 in
2002.

         On January 2, 2002 we executed a letter of intent with Lonza to enter
into a long-term supply agreement. The long-term supply agreement would apply to
a large scale manufacturing facility that Lonza is constructing. We expect such
facility


                                    Page 17
<PAGE>

would be able to produce ERBITUX in 20,000 liter batches. We paid Lonza
$3,250,000 for the exclusive rights to reserve and negotiate a long-term supply
agreement for a portion of the new facility's overall capacity. Under certain
conditions, such payment shall be refunded to us. If we enter into a long-term
supply agreement, such payment will be creditable to us against the 20,000 liter
batch price, such credit to be spread evenly over the batches manufactured each
year of the initial term of the long-term supply agreement.

         We cannot be certain that we will be able to enter into agreements for
commercial supply with third party manufacturers on terms acceptable to us. Even
if we are able to enter into such agreements, we cannot be certain that we will
be able to produce or obtain sufficient quantities for commercial sale of our
products. Any delays in producing or obtaining commercial quantities of our
products could have a material adverse effect on our business, financial
condition and results of operations.

         Effective April 1990, we entered into a development and
commercialization agreement with Merck KGaA with respect to BEC2 and the
recombinant gp75 antigen. The agreement has been amended a number of times, most
recently in December 1997. The agreement grants Merck KGaA a license, with the
right to sublicense, to make, have made, use, sell, or have sold BEC2 and gp75
outside North America. The agreement also grants Merck KGaA a license, without
the right to sublicense, to use, sell, or have sold, but not to make BEC2 within
North America in conjunction with ImClone Systems. Pursuant to the terms of the
agreement we have retained the rights, (1) without the right to sublicense, to
make, have made, use, sell, or have sold BEC2 in North America in conjunction
with Merck KGaA and (2) with the right to sublicense, to make, have made, use,
sell, or have sold gp75 in North America. In return, we have recognized research
support payments totaling $4,700,000 and are entitled to no further research
support payments under the agreement. Merck KGaA is also required to make
payments of up to $22,500,000, of which $4,000,000 has been recognized, based on
milestones achieved in the licensed products' development. Merck KGaA is also
responsible for worldwide costs of up to DM17,000,000 associated with a
multi-site, multinational phase III clinical trial for BEC2 in limited disease
small-cell lung carcinoma. This expense level was reached during the fourth
quarter of 2000 and all expenses incurred from that point forward are being
shared 60% by Merck KGaA and 40% by ImClone Systems. Such cost sharing applies
to all expenses beyond the DM17,000,000 threshold. Merck KGaA is also required
to pay royalties on the eventual sales of BEC2 outside of North America, if any.
Revenues from sales, if any, of BEC2 in North America will be distributed in
accordance with the terms of a co-promotion agreement to be negotiated by the
parties.

         In December 1998, we entered into a development and license agreement
with Merck KGaA with respect to ERBITUX. In exchange for granting Merck KGaA
exclusive rights to market ERBITUX outside of the United States and Canada and
co-development rights in Japan, we received through March 31, 2002, $30,000,000
in up-front fees and early cash-based milestone payments based on the
achievement of defined milestones. An additional $30,000,000 can be received, of
which $5,000,000 has been received as of March 31, 2002, assuming the
achievement of further milestones for which Merck KGaA will receive equity in
ImClone Systems. The equity underlying these milestone payments will be priced
at varying premiums to the then-market price of the common stock depending upon
the timing of the achievement of the respective milestones. If issuing shares of
common stock to Merck KGaA would result in Merck KGaA owning greater than 19.9%
of our common stock, the milestone shares will be a non-voting preferred stock,
or other non-voting stock convertible into our common stock. These convertible
securities will not have voting rights. They will be convertible at a price
determined in the same manner as the purchase price for shares of our common
stock if shares of common stock were to be issued. They will not be convertible
into common stock if, as a result of the conversion, Merck KGaA would own
greater than 19.9% of our common stock. This 19.9% limitation is in place
through December 2002. Merck KGaA will pay us a royalty on future sales of
ERBITUX outside of the United States and Canada, if any. This agreement may be
terminated by Merck KGaA in various instances, including (1) at its discretion
on any date on which a milestone is achieved (in which case no milestone payment
will be made), or (2) for a one-year period after first commercial sale of
ERBITUX in Merck KGaA's territory, upon Merck KGaA's reasonable determination
that the product is economically unfeasible (in which case Merck KGaA is
entitled to a return of 50% of the cash-based up front fees and milestone
payments then paid to date, but only out of revenues received, if any, based
upon a royalty rate applied to the gross profit from ERBITUX sales or a
percentage of ERBITUX fees and royalties from a sublicensee on account of the
sale of ERBITUX in the United States and Canada). In August 2001, ImClone
Systems and Merck KGaA amended this agreement to provide, among other things,
that Merck KGaA may manufacture ERBITUX for supply in its territory and may
utilize a third party to do so upon ImClone Systems' reasonable acceptance. The
amendment further released Merck KGaA from its obligations under the agreement
relating to providing a guaranty under a $30,000,000 credit facility relating to
the build-out of the product launch manufacturing facility. In addition, the
amendment provides that the companies have co-exclusive rights to ERBITUX in
Japan, including the right to sublicense and Merck KGaA waived its right of
first offer in the case of a proposed sublicense by


                                    Page 18
<PAGE>


ImClone Systems of ERBITUX in ImClone Systems' territory. In consideration for
the amendment, we agreed to a reduction in royalties payable by Merck KGaA on
sales of ERBITUX in Merck KGaA's territory.

         We have obligations under various capital leases for certain
laboratory, office and computer equipment and also certain building
improvements, primarily under a 1998 financing agreement with Finova. This
agreement allowed us to finance the lease of equipment and make certain building
and leasehold improvements to existing facilities. Each lease has a fair market
value purchase option at the expiration of its 48-month term. We have entered
into six individual leases under the financing agreement with an aggregate cost
of $1,942,000. This financing arrangement is now expired.

         We rent our current New York corporate headquarters and research
facility under an operating lease that expires in December 2004. In 2000 we
completed renovations of the facility to better suit our needs, at a cost of
approximately $2,800,000.

         In October 2001, we entered into a sublease for a four-story building
in downtown New York to serve as our future corporate headquarters and research
facility. The space, to be designed and improved in the future, includes between
75,000 and 100,000 square feet of usable space, depending on design, and
includes possible additional expansion space. The sublease has a term of 22
years, followed by two five-year renewal option periods. The future minimum
lease payments are approximately $50,775,000 over the term of the sublease. In
order to induce the sublandlord to enter into the sublease, we made a loan to
and accepted from the sublandlord a $10,000,000 note receivable. The note is
secured by a leasehold mortgage on the prime lease as well as a collateral
assignment of rents by the sublandlord. The note receivable is payable by the
sublandlord over 20 years and bears interest at 5 1/2% in years one through
five, 6 1/2% in years six through ten, 7 1/2% in years eleven through fifteen
and 8 1/2% in years sixteen through twenty. In addition, we paid the owner a
consent fee in the amount of $500,000.

         On May 1, 2001, we entered into a lease for an approximately 4,000
square foot portion of a 15,000 square foot building known as 710 Parkside
Avenue, Brooklyn, New York and we have leased an adjacent 6,250 square foot
building known as 313-315 Clarkson Avenue, Brooklyn, New York, (collectively
"the premises") to serve as our new chemistry and high throughput screening
facility. The term of the lease is for five years with five successive one-year
extensions. As of March 31, 2002, we have incurred approximately $2,204,000 for
the retrofit of this facility to better fit our needs. The total cost for the
retrofit will be approximately $4,000,000.

         We built a new 80,000 square foot product launch manufacturing facility
adjacent to the pilot facility in Somerville, New Jersey. The product launch
manufacturing facility was built on a 5.7 acre parcel of land we purchased in
December 1999 for approximately $700,000. The product launch manufacturing
facility contains three 10,000 liter (working volume) fermenters and is
dedicated to the clinical and commercial production of ERBITUX. The cost of the
facility was approximately $53,000,000, excluding capitalized interest of
approximately $1,966,000. The cost for the facility has come from our cash
reserves, which were primarily obtained through the issuance of debt and equity
securities. The product launch manufacturing facility was ready for its intended
use and put in operation in July 2001 and we commenced depreciation at that
time.

         We have completed conceptual design and preliminary engineering plans
and are currently reviewing detailed design plans for, and proceeding with
construction of, the second commercial manufacturing facility. The second
commercial manufacturing facility will be a multi-use facility of approximately
250,000 square feet and will contain up to 10 fermenters with a total capacity
of up to 110,000 liters (working volume). The facility will be built on a 7.12
acre parcel of land that we purchased in July 2000 for approximately $950,000.
The cost of this facility, consisting of two completely fitted out suites and a
third suite with utilities only, is expected to be approximately $225,000,000,
excluding capitalized interest. The actual cost of the new facility may change
depending upon various factors. We have incurred approximately $36,790,000,
excluding capitalized interest of approximately $1,040,000, in conceptual
design, engineering, equipment and construction costs through March 31, 2002.

         On January 31, 2002 we purchased a 7.5 acre parcel of land located at
adjacent to the Company's product launch manufacturing facility and pilot
facility in Somerville, New Jersey. The real estate includes an existing 50,000
square foot building, 40,000 square feet of which is warehouse space and 10,000
square feet of which is office space. The purchase price for the property and
improvements was approximately $7,020,000. We intend to use this property for
warehousing and logistics for our Somerville campus.

                                    Page 19
<PAGE>


         Total capital expenditures made during the three months ended March 31,
2002 were $17,922,000 and primarily included $763,000 related to the purchase of
equipment for and leasehold improvement costs associated with our corporate
office and research laboratories in our New York facility, $7,416,000 related to
the conceptual design, preliminary engineering plans and construction costs for
a second commercial manufacturing facility, $1,125,000 and $5,895,000 for the
land and building, respectively, for the warehousing and logistics building,
$1,541,000 for the retrofit of the Brooklyn chemistry lab, $544,000 related to
improving and equipping our product launch manufacturing facility, and $314,000
related to improving and equipping our pilot manufacturing facility.

         We believe that our existing cash on hand, marketable securities and
amounts to which we are entitled should enable us to maintain our current and
planned operations through at least 2003. We are also entitled to reimbursement
for certain marketing and research and development expenditures and certain
other payments, some of which are payable upon the achievement of research and
development milestones. Such amounts include $560,000,000 in cash-based payments
of which $60,000,000 is payable on March 5, 2003, as well as up to $25,000,000
in equity-based milestone payments under our ERBITUX development and license
agreement with Merck KGaA and up to $18,500,000 in cash-based milestone payments
under our BEC2 development agreement with Merck KGaA. There can be no assurance
that we will achieve these milestones. Our future working capital and capital
requirements will depend upon numerous factors, including, but not limited to:

     o    progress and cost of our research and development programs,
          pre-clinical testing and clinical trials

     o    our corporate partners fulfilling their obligations to us

     o    timing and cost of seeking and obtaining regulatory approvals

     o    timing and cost of manufacturing scale-up and effective
          commercialization activities and arrangements

     o    level of resources that we devote to the development of marketing and
          sales capabilities

     o    costs involved in filing, prosecuting and enforcing patent claims

     o    technological advances

     o    legal costs and the outcome of outstanding legal proceedings and
          investigations

     o    status of competition

     o    our ability to maintain existing corporate collaborations and
          establish new collaborative arrangements with other companies to
          provide funding to support these activities

         In order to fund our capital needs after 2003, we will require
significant levels of additional capital and we intend to raise the capital
through additional arrangements with corporate partners, equity or debt
financings, or from other sources, including the proceeds of product sales, if
any. There is no assurance that we will be successful in consummating any such
arrangements. If adequate funds are not available, we may be required to
significantly curtail our planned operations.

Below is a table that presents our contractual obligations and commercial
commitments as of March 31, 2002:

<TABLE>
<CAPTION>
                                                                       Payments Due by Year
                                             ----------------------------------------------------------------------------
                                                                                                              2005 and
                                                 Total          2002            2003           2004          Thereafter
                                            --------------  -------------  -------------   -------------  ---------------
<S>                                         <C>             <C>            <C>             <C>            <C>
Long-term debt                              $  242,200,000  $          --  $          --   $   2,200,000  $   240,000,000
Capital lease obligations including interest       349,000        288,000         61,000              --               --
Operating leases                                55,133,000      1,556,000      3,024,000       3,512,000       47,041,000
Construction commitments                       102,592,000     55,000,000     47,592,000              --               --
Lonza                                           72,510,000     48,460,000     24,050,000              --               --
                                            --------------  -------------  -------------   -------------  ---------------
</TABLE>


                                    Page 20
<PAGE>
<TABLE>
<S>                                         <C>             <C>            <C>             <C>            <C>
Total contractual cash obligations          $  472,784,000  $ 105,304,000  $  74,727,000   $   5,712,000  $   287,041,000
                                            ==============  =============  =============   =============  ===============
</TABLE>
         At December 31, 2001, we had net operating loss carryforwards for
United States federal income tax purposes of approximately $437,189,000, which
expire at various dates from 2002 through 2021. At December 31, 2001 we had
research credit carryforwards of approximately $19,415,000, which expire at
various dates from 2008 through 2021. Under Section 382 of the Internal Revenue
Code of 1986, as amended, a corporation's ability to use net operating loss and
research credit carryforwards may be limited if the corporation experiences a
change in ownership of more than 50 percentage points within a three-year
period. Since 1986, we have experienced two such ownership changes. As a result,
we are only permitted to use in any one year approximately $5,159,000 of our
available net operating loss carryforwards that occurred prior to February 1996.
Similarly, we are limited in using our research credit carryforwards. We have
determined that our November 1999 public stock offering, our February 2000
private placement of convertible subordinated notes, our August 2001 issuance of
common stock to Merck KGaA associated with an equity milestone payment under the
ERBITUX development and license agreement and our September 2001 acquisition
agreement with BMS and BMS Biologies, which provided for the tender offer by BMS
Biologies to purchase up to 14,392,003 shares of the Company's common stock for
$70.00 per share, net to the seller in cash, did not cause an additional
ownership change that would further limit the use of our net operating losses
and research credit carryforwards. Of our $437,189,000 in net operating loss
carry forwards, we have approximately $395,245,000 (of which $390,086,000 will
carryforward to 2003) available to use in 2002, approximately $5,159,000
available to use in each year from 2003 through 2010 and approximately $672,000
available to use in 2011. Any of the aforementioned net operating loss
carryforwards which are not utilized are available for utilization in future
years, subject to the statutory expiration dates of such net operating loss
carryforwards.

RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS

         On August 17, 2001, Statement of Financial Accounting Standards No.
143, "Accounting for Asset Retirement Obligations" was issued and will be
effective for the Company in the first quarter of the year ended December 31,
2003. The new rule requires the fair value of a liability for an asset
retirement obligation to be recognized in the period in which it is incurred.
When the liability is initially recorded, a cost is capitalized by increasing
the carrying amount of the related long-lived asset. Over time, the liability is
accreted to its present value each period, and the capitalized cost is
depreciated over the useful life of the related asset. To settle the liability,
the obligation for its recorded amount is paid or a gain or loss upon settlement
is incurred. Management will be analyzing this requirement to determine the
effect on the Company's financial statements.

CERTAIN FACTORS AFFECTING FORWARD-LOOKING STATEMENTS--SAFE HARBOR STATEMENT

         Those statements contained herein that do not relate to historical
information are forward-looking statements. There can be no assurance that the
future results covered by such forward-looking statements will be achieved.
Actual results may differ materially due to the risks and uncertainties inherent
in our business, including without limitation, the risks and uncertainties
associated with completing pre-clinical and clinical trials of our compounds
that demonstrate such compounds' safety and effectiveness; obtaining additional
financing to support our operations; obtaining and maintaining regulatory
approval for such compounds and complying with other governmental regulations
applicable to our business; obtaining the raw materials necessary in the
development of such compounds; consummating collaborative arrangements with
corporate partners for product development; achieving milestones under
collaborative arrangements with corporate partners; developing the capacity and
ability to manufacture, as well as market and sell our products, either directly
or with collaborative partners; developing market demand for and acceptance of
such products; competing effectively with other pharmaceutical and
biotechnological products; obtaining adequate reimbursement from third-party
payors; attracting and retaining key personnel; obtaining and protecting
proprietary rights; legal costs and the outcome of outstanding legal proceedings
and investigations; and those other factors set forth in "Risk Factors" in the
Company's most recent Registration Statement and Form 10-K.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.

         Our holdings of financial instruments comprise a mix of U.S. dollar
denominated securities that may include U.S. corporate debt, foreign corporate
debt, U.S. government debt, foreign government/agency guaranteed debt and
commercial paper. All such instruments are classified as securities available
for sale. Generally, we do not invest in portfolio equity securities,
commodities, foreign exchange contacts or use financial derivatives for trading
purposes. Our debt security portfolio represents funds held temporarily pending
use in our business and operations. We manage these funds accordingly. We seek
reasonable assuredness of the safety of principal and

                                    Page 21
<PAGE>


market liquidity by investing in investment grade fixed income securities while
at the same time seeking to achieve a favorable rate of return. Our market risk
exposure consists principally of exposure to changes in interest rates. Our
holdings are also exposed to the risks of changes in the credit quality of
issuers. We invest in securities that have a range of maturity dates. Typically,
those with a short-term maturity are fixed-rate, highly liquid, debt instruments
and those with longer-term maturities are highly liquid debt instruments with
fixed interest rates or with periodic interest rate adjustments. The table below
presents the principal amounts and related weighted average interest rates by
year of maturity for our investment portfolio as of March 31, 2002.

<TABLE>
<CAPTION>

                            2002           2003         2004              2005             2006
                            ----           ----         ----              ----             ----
<S>                      <C>            <C>           <C>              <C>             <C>
Fixed Rate               $8,863,000     $  247,000    $       --       $       --      $       --
Average Interest Rate          6.45%          6.00%           --               --              --
Variable Rate            12,005,000(1)          --    15,287,000(1)    24,845,000(1)    4,799,000(1)
Average Interest Rate          2.05%            --          4.61%            2.20%           2.31%
                         ----------     ----------   -----------       ----------      ----------
                        $20,868,000     $  247,000   $15,287,000      $24,845,000      $4,799,000
                        ===========     ==========   ===========      ===========      ==========
</TABLE>

<TABLE>
<CAPTION>
                          2007 AND
                          THEREAFTER         TOTAL      FAIR VALUE
                          ----------         -----      ----------
<S>                       <C>              <C>          <C>
Fixed Rate                $21,061,000      $30,171,000  $ 31,587,000
Average Interest Rate            6.27%            6.32%           --
Variable Rate             210,313,000(1)   267,249,000   268,468,000
Average Interest Rate            2.78%            2.79%           --
                          -----------      -----------   -----------
                         $231,374,000     $297,420,000  $300,055,000
                         ============     ============  ============
</TABLE>
(1)      These holdings consist of U.S. corporate and foreign corporate floating
         rate notes. Interest on the securities is adjusted monthly, quarterly
         or semi-annually, depending on the instrument, using prevailing
         interest rates. These holdings are highly liquid and we consider the
         potential for loss of principal to be minimal.

         Our 5 1/2% convertible subordinated notes in the principal amount of
$240,000,000 due March 1, 2005 and other long-term debt have fixed interest
rates. The subordinated notes are convertible into our common stock at a
conversion price of $55.09 per share. The fair value of fixed interest rate
instruments are affected by changes in interest rates and in the case of the
convertible notes by changes in the price of our common stock. The fair value of
the 5 1/2% convertible subordinated notes (which have a carrying value of
$240,000,000) was approximately $206,700,000 at March 31, 2002.

PART II - OTHER INFORMATION

ITEM 1 - LEGAL PROCEEDINGS

A. LITIGATION

1.  FEDERAL SECURITIES CLASS ACTIONS

         A number of complaints asserting claims under Section 10(b) of the
Securities Exchange Act of 1934 (the "Exchange Act"), Rule 10b-5 promulgated
thereunder and Section 20(a) of the Exchange Act have been filed in the U.S.
District Court for the Southern District of New York against us and certain of
our directors and officers on behalf of purported classes of our shareholders. A
motion is pending that will result in the consolidation of these actions under
the caption In re ImClone Systems Inc. Securities Litigation, No. 02 Civ. 0109
(RO). The complaints in these actions allege generally that various public
statements made by us or our senior officers during 2001 and early 2002
regarding the prospects for FDA approval of ERBITUX were false or misleading
when made, that various Company insiders were aware of material, non-public
information regarding the actual prospects for ERBITUX at the time that those
insiders engaged in transactions in our common stock and that members of the
purported shareholder class suffered damages when the market price of our common
stock declined following disclosure of the information that allegedly had not
been previously disclosed. On December 28, 2001, we disclosed that we had
received a "refusal to file" letter from the FDA relating to our biologics
license application for ERBITUX. Thereafter, various news articles purported to
describe the contents of the FDA's "refusal to file" letter. During this period,
the market price of our common stock declined. The complaints in the various
actions seek to proceed on behalf of a class of our present and former
shareholders, other than defendants or persons affiliated with the defendants,
seek monetary damages in an unspecified amount and seek recovery of plaintiffs'
costs and attorneys' fees.

2.  DERIVATIVE ACTIONS

         Beginning on January 13, 2002 and continuing thereafter, eight separate
purported shareholder derivative actions have been filed against the members of
our Board of Directors and the Company, as nominal defendant, advancing claims
based on


                                    Page 22

<PAGE>

allegations similar to the allegations in the federal securities class
action complaints. Three of these derivative cases were filed in the Delaware
Court of Chancery and have been consolidated in that court under the caption In
re ImClone Systems Incorporated Derivative Litigation, Cons. C.A. No. 19341-NC.
An additional case has been filed in the Delaware Court of Chancery, styled Krim
v. Waksal, et al., C.A. No. 19528-NC, which likely will be consolidated with the
other actions pending in that court. In addition, two purported derivative
actions have been filed in the U.S. District Court for the Southern District of
New York, styled Lefanto v. Waksal, et al., No. 02 Civ. 0163 (LLS), and Forbes
v. Barth, et al., No. 02 Civ. 1400 (RO), and two purported derivative actions
have been filed in New York State Supreme Court in Manhattan, styled Boghosian
v. Barth, et al., Index No. 100759/02 and Johnson v. Barth, et al., Index No.
601304/02. All of these actions assert claims, purportedly on our behalf, for
breach of fiduciary duty by certain members of the Board of Directors based on
the allegation, among others, that certain directors engaged in transactions in
our common stock while in possession of material, non-public information
concerning the regulatory and marketing prospects for ERBITUX. Another
complaint, purportedly asserting direct claims on behalf of a class of the
Company's shareholders but in fact asserting derivative claims that are similar
to those asserted in these six cases, was filed in the U.S. District Court for
the Southern District of New York on February 13, 2002, styled Dunlap v. Waksal,
et al., No. 02 Civ. 1154 (RO). The Dunlap complaint asserts claims against the
Board of Directors for breach of fiduciary duty purportedly on behalf of all
persons who purchased shares of the Company's common stock prior to June 28,
2001 and then held those shares through December 6, 2001. It alleges that the
members of the purported class suffered damages as a result of holding their
shares based on allegedly false information about the financial prospects of the
Company that was disseminated during this period.

         All of these actions are in their earliest stages. We intend to contest
vigorously the claims asserted in these actions.

B.  GOVERNMENT INQUIRIES AND INVESTIGATIONS

         As previously reported, we have received subpoenas and requests for
information in connection with investigations by the Securities Exchange
Commission, the Subcommittee on Oversight and Investigations of the U.S. House
of Representatives Committee on Energy and Commerce and the U.S. Department of
Justice relating to the circumstances surrounding the disclosure of the FDA
letter dated December 28, 2001 and trading in our securities by certain Company
insiders in 2001. We are cooperating with all of these inquiries and intend to
continue to do so.

ITEM 2 - CHANGES IN SECURITIES AND USE OF PROCEEDS

         None

ITEM 6 - EXHIBITS AND REPORTS ON FORM 8-K

         (a) Exhibits (numbered in accordance with Item 601 of Regulation S-K)

             None.

         (b) Reports on Form 8-K

             On January 25, 2002, the Company filed three Current Reports
             on Form 8-K and on each of February 19, 2002 and March 6, 2002
             the Company filed a Current Report on Form 8-K with the
             Securities and Exchange Commission reporting events under Item 5.

                                    Page 23
<PAGE>


                                   SIGNATURES

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

                                 IMCLONE SYSTEMS INCORPORATED
                                 (Registrant)

Date: May 15, 2002               By           /s/  SAMUEL D. WAKSAL
                                   -------------------------------------------
                                                 Samuel D. Waksal
                                       President and Chief Executive Officer

Date: May 15, 2002               By            /s/  DANIEL S. LYNCH
                                   -------------------------------------------
                                                  Daniel S. Lynch
                                        Senior Vice President, Finance and
                                                Chief Financial Officer

                                    Page 24