IDEC PHARMACEUTICALS CORP / DE
10-Q, 1999-11-15
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>   1

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


                                    FORM 10-Q

(Mark One)
[X]              QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934
                For the quarterly period ended September 30, 1999

                                       OR

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

                         Commission file number: 0-19311


                        IDEC PHARMACEUTICALS CORPORATION
             (Exact name of registrant as specified in its charter)


<TABLE>
<S>                                                 <C>
Delaware                                                      33-0112644
(State or other jurisdiction of                         (I.R.S. Employer
incorporation or organization)                        Identification No.)
</TABLE>


                    11011 Torreyana Road, San Diego, CA 92121
              (Address of principal executive offices)     (Zip code)

                                 (858) 431-8500
              (Registrant's telephone number, including area code)




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


As of October 31, 1999 the Registrant had 21,150,800 shares of its common stock,
$.001 par value, issued and outstanding.


<PAGE>   2


                        IDEC PHARMACEUTICALS CORPORATION

                          FORM 10-Q -- QUARTERLY REPORT
                FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 1999

                                TABLE OF CONTENTS



<TABLE>
<S>            <C>                                                                                                      <C>
PART I.        FINANCIAL INFORMATION

Item 1.        Financial Statements
               Condensed Consolidated Balance Sheets -- September 30, 1999 and December 31, 1998 .................       1
               Condensed Consolidated Statements of Operations -- Three months ended September 30, 1999
                    and 1998 and nine months ended September 30, 1999 and 1998 ...................................       2
               Condensed Consolidated Statements of Cash Flows -- Nine months ended September 30, 1999
                    and 1998  ....................................................................................       3
               Notes to Condensed Consolidated Financial Statements ..............................................       4

Item 2.        Management's Discussion and Analysis of Financial Condition and Results of Operations .............       7

Item 3.        Quantitative and Qualitative Disclosures About Market Risk ........................................      20

PART II.       OTHER INFORMATION

Item 1.        Legal Proceedings .................................................................................      21

Item 2.        Changes in Securities .............................................................................      21

Item 3.        Defaults upon Senior Securities ...................................................................      21

Item 4.        Submission of Matters to a Vote of Stockholders ...................................................      21

Item 5.        Other Information..................................................................................      21

Item 6.        Exhibits and Reports on Form 8-K ..................................................................      21

</TABLE>



<PAGE>   3


                         PART I -- FINANCIAL INFORMATION
Item 1. Financial Statements.


IDEC PHARMACEUTICALS CORPORATION AND SUBSIDIARY
CONDENSED CONSOLIDATED BALANCE SHEETS
(In thousands, except par value)

<TABLE>
<CAPTION>
                                                                             September 30,         December 31,
                                                                                 1999                  1998
                                                                             -------------         ------------
                                                                             (unaudited)
<S>                                                                         <C>                   <C>
ASSETS
Current assets:
   Cash and cash equivalents                                                     $  78,334         $  26,929
   Securities available-for-sale                                                   151,658            46,573
   Contract revenue receivables, net                                                 1,381             2,345
   Due from related party, net                                                      21,653            17,473
   Inventories                                                                       8,951             5,346
   Prepaid expenses and other current assets                                         4,647             2,361
                                                                                 ---------         ---------
            Total current assets                                                   266,624           101,027

Property and equipment, net                                                         20,345            20,897
Investment and other assets                                                          7,595             3,349
                                                                                 ---------         ---------
                                                                                 $ 294,564         $ 125,273
                                                                                 =========         =========

LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
   Current portion of notes payable                                              $   1,455         $   1,910
   Accounts payable                                                                  2,312             1,989
   Accrued expenses                                                                 14,062            10,238
   Deferred revenue                                                                    346               346
                                                                                 ---------         ---------
            Total current liabilities                                               18,175            14,483
Notes payable, less current portion                                                121,704             2,095
Deferred rent and other long-term liabilities                                        2,891             2,267
Commitments

Stockholders' equity:
   Convertible preferred stock, $.001 par value                                         --                --
   Common stock, $.001 par value                                                        21                20
   Additional paid-in capital                                                      194,872           184,282
   Accumulated other comprehensive income - net unrealized gains (losses)
       on securities available-for-sale                                               (670)                1
   Accumulated deficit                                                             (42,429)          (77,875)
                                                                                 ---------         ---------
            Total stockholders' equity                                             151,794           106,428
                                                                                 ---------         ---------
                                                                                 $ 294,564         $ 125,273
                                                                                 =========         =========

</TABLE>

See accompanying notes to condensed consolidated financial statements.


                                       1
<PAGE>   4

IDEC PHARMACEUTICALS CORPORATION AND SUBSIDIARY
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
(In thousands, except per share data)
(unaudited)

<TABLE>
<CAPTION>

                                                                       Three months                   Nine months
                                                                    ended September 30,            ended September 30,
                                                                  ----------------------        ----------------------
                                                                    1999           1998           1999          1998
                                                                  -------        -------        -------        -------
<S>                                                              <C>            <C>            <C>            <C>
Revenues:
   Revenues from unconsolidated joint business                    $25,899        $12,290        $66,223        $31,046
   Contract revenues                                                4,291          2,719          6,772          9,860
   License fees                                                        --          2,000         13,000         18,300
                                                                  -------        -------        -------        -------
                                                                   30,190         17,009         85,995         59,206

Operating costs and expenses:
   Manufacturing costs                                              4,789          4,055          9,675         10,985
   Research and development                                        10,798          8,009         28,152         22,187
   Selling, general and administrative                              4,622          3,784         13,875         12,225
                                                                  -------        -------        -------        -------
                                                                   20,209         15,848         51,702         45,397
                                                                  -------        -------        -------        -------
Income from operations                                              9,981          1,161         34,293         13,809
Interest income, net                                                1,305            756          2,944          2,238
                                                                  -------        -------        -------        -------
Income before taxes                                                11,286          1,917         37,237         16,047
Income tax provision                                                  557            152          1,791            282
                                                                  -------        -------        -------        -------

Net income                                                        $10,729        $ 1,765        $35,446        $15,765
                                                                  =======        =======        =======        =======

Earnings per share:
       Basic                                                      $  0.52        $  0.09        $  1.73        $  0.80
       Diluted                                                    $  0.42        $  0.08        $  1.42        $  0.67

Shares used in calculation of earnings per share:
       Basic                                                       20,779         19,892         20,527         19,779
       Diluted                                                     25,541         22,898         24,929         23,365

</TABLE>
See accompanying notes to condensed consolidated financial statements


                                       2
<PAGE>   5

IDEC PHARMACEUTICALS CORPORATION AND SUBSIDIARY
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(In thousands)
(unaudited)
<TABLE>
<CAPTION>

                                                                               Nine months ended
                                                                                  September 30,
                                                                             1999             1998
                                                                          ---------         --------
<S>                                                                      <C>               <C>
Cash flows from operating activities:
               Net cash provided by (used in) operating activities        $  38,118         $ (2,236)
                                                                          ---------         --------

Cash flows from investing activities:
      Purchase of property and equipment                                     (2,698)          (1,252)
      Purchase of securities available-for-sale                            (177,007)         (45,784)
      Sales and maturities of securities available-for-sale                  71,251           34,378
                                                                          ---------         --------
               Net cash used in investing activities                       (108,454)         (12,658)
                                                                          ---------         --------

Cash flows from financing activities:
      Proceeds from issuance of convertible notes, net                      112,673               --
      Payments on notes payable                                              (1,410)          (3,421)
      Proceeds from issuance of common stock                                 10,478            2,515
                                                                          ---------         --------
               Net cash provided by (used in) financing activities          121,741             (906)
                                                                          ---------         --------

Net increase (decrease) in cash and cash equivalents                         51,405          (15,800)
Cash and cash equivalents, beginning of period                               26,929           34,847
                                                                          ---------         --------
Cash and cash equivalents, end of period                                  $  78,334         $ 19,047
                                                                          =========         ========
</TABLE>


See accompanying notes to condensed consolidated financial statements.



                                       3
<PAGE>   6

IDEC PHARMACEUTICALS CORPORATION AND SUBSIDIARY
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(Unaudited)

NOTE 1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     Basis of Presentation: The information at September 30, 1999, and for the
three and nine month periods ended September 30, 1999 and 1998, is unaudited. In
the opinion of management, these condensed consolidated financial statements
include all adjustments, consisting of normal recurring adjustments, necessary
for a fair presentation of results for the interim periods presented. Interim
results are not necessarily indicative of results for a full year or for any
subsequent interim period. These condensed consolidated financial statements
should be read in conjunction with IDEC Pharmaceuticals Corporation's (the
"Company") Annual Report on Form 10-K for the year ended December 31, 1998.

     Inventories: Inventories are stated at the lower of cost or market. Cost is
determined in a manner that approximates the first-in, first-out (FIFO) method.
Inventories consist of the following (table in thousands):

<TABLE>
<CAPTION>
                                                 September 30,         December 31,
                                                     1999                  1998
                                                    ------                ------
<S>                                              <C>                   <C>
Raw materials                                       $1,255                $2,273
Work in process                                      1,982                   273
Finished goods                                       5,714                 2,800
                                                    ------                ------
                                                    $8,951                $5,346
                                                    ======                ======
</TABLE>

     Revenues from Unconsolidated Joint Business: Revenues from unconsolidated
joint business consist of the Company's share of the pretax copromotion profits
generated from its joint business arrangement with Genentech, Inc.
("Genentech"), revenue from bulk Rituxan(R) sales to Genentech, reimbursement
from Genentech of the Company's sales force and development expenses and royalty
income from F. Hoffmann-La Roche Ltd. ("Roche") on sales of Rituximab outside
the United States. Rituxan is the trade name in the United States for the
compound Rituximab. Outside the United States, Rituximab is marketed as MabThera
(Rituximab, Rituxan and MabThera are collectively referred to herein as Rituxan,
except where otherwise indicated). The Company records its royalty income from
Roche with a one-quarter lag. Under the joint business arrangement, all U.S.
sales of Rituxan and associated costs and expenses will be recognized by
Genentech, with the Company recording its share of the pretax copromotion
profits on a quarterly basis, as defined in the Company's collaborative
agreement with Genentech (Note 2). Pretax copromotion profits under the joint
business arrangement are derived by taking U.S. net sales of Rituxan to
third-party customers less cost of sales, third-party royalty expenses,
distribution, selling and marketing expenses and joint development expenses
incurred by the Company and Genentech. Revenue from bulk Rituxan sales is
recognized when bulk Rituxan is accepted by Genentech. The Company's
profit-sharing formula with Genentech has two tiers; the higher tier applies
once a certain copromotion profit level is met. The profit-sharing formula
resets to the lower tier on an annual basis, at the beginning of each year.
During the second quarter, the Company began recording its 1999 profit share at
the higher tier.

     Contract Revenues: Contract revenues consist of nonrefundable research and
development funding under collaborative agreements with the Company's various
strategic partners and other funding under contractual arrangements with other
parties. Contract research and development funding generally compensates the
Company for discovery, preclinical and clinical expenses related to the
collaborative development programs for certain products and product candidates
of the Company and is recognized at the time research and development activities
are performed under the terms of the collaborative agreements. Contract revenues
earned in excess of contract payments received are classified as contract
revenue receivables, and contract research and development funding received in
excess of amounts earned are classified as deferred revenue. Contract revenue
receivables at September 30, 1999 and December 31, 1998 are net of an allowance
of $355,000 and $775,000, respectively.

     License Fees: License fees consist of nonrefundable fees from product
development milestone payments, the sale of license rights to the Company's
proprietary gene expression technology and nonrefundable fees from the sale of
product rights under collaborative development and license agreements with the
Company's strategic partners. Revenues from product development milestone
payments are recognized when the results or events stipulated in the agreement
have been achieved. License fee payments received in excess of amounts earned
are classified as deferred revenue.


                                       4
<PAGE>   7

     Manufacturing Costs: Manufacturing costs consist of manufacturing costs
related to the production of bulk Rituxan sold to Genentech.

     Earnings Per Share: Earnings per share are calculated in accordance with
Statement of Financial Accounting Standards No. 128 "Earnings per Share." Basic
earnings per share excludes the dilutive effects of options, warrants and other
convertible securities compared to diluted earnings per share which reflects the
potential dilution of options, warrants and other convertible securities that
could share in the earnings of the Company. Calculations of basic and diluted
earnings per share use the weighted average number of shares outstanding during
the period. Diluted earnings per share for the three and nine months ended
September 30, 1999 includes the diluted effect of 4,762,000 shares and 4,402,000
shares, respectively, of potentially issuable common stock from options and
convertible preferred stock and excludes 2,323,000 shares and 1,967,000 shares,
respectively, of common stock from the assumed conversion of 20-year convertible
zero coupon subordinated notes ("Notes") because their effect was antidilutive.
Diluted earnings per share for the three and nine months ended September 30,
1998 includes the diluted effect of 3,006,000 shares and 3,586,000 shares,
respectively, of potentially issuable common stock from options, warrants and
convertible preferred stock and excludes 1,683,000 shares and 649,000 shares,
respectively, of common stock from options because the options' exercise price
was greater than the average market price of the Company's common stock for the
respective periods.

     Comprehensive Income: Comprehensive income for the three and nine months
ended September 30, 1999 was $10,704,000 and $34,808,000, respectively, compared
to $1,841,000 and $15,740,000 for comparable periods in 1998.

 NOTE 2. RELATED PARTY ARRANGEMENTS

     In March 1995, the Company and Genentech entered into a collaborative
agreement for the clinical development and commercialization of the Company's
anti-CD20 monoclonal antibody, Rituxan, for the treatment of relapsed or
refractory, low-grade or follicular, CD20-positive, B-cell non-Hodgkin's
lymphomas ("B-cell non-Hodgkin's lymphomas"). Concurrent with the collaborative
agreement the Company and Genentech also entered into an expression technology
license agreement for a proprietary gene expression technology developed by the
Company and a preferred stock purchase agreement providing for certain equity
investments in the Company by Genentech. Under the terms of these agreements,
the Company has received payments totaling $58,500,000. Additionally, the
Company may be reimbursed by Genentech for certain other development and
regulatory approval expenses under the terms of the collaborative agreement.
Genentech may terminate this agreement for any reason, which would result in a
loss of Genentech's Rituxan product rights.

     In addition, the Company and Genentech are copromoting Rituxan in the
United States under a joint business arrangement, with the Company receiving a
share of the pretax copromotion profits. Under the Company's agreement with
Genentech, the sales price of bulk Rituxan manufactured by the Company and sold
to Genentech is capped at a price that is less than the Company's cost to
manufacture bulk Rituxan. In September 1999, the Company transferred all
manufacturing activities for bulk Rituxan to Genentech. Included in inventories
at September 30, 1999, is $5,714,000 of bulk Rituxan inventory which is expected
to be sold to Genentech.

     Under the terms of separate agreements with Genentech, commercialization of
Rituxan outside the United States is the responsibility of Roche, except in
Japan, where Zenyaku Kogyo Co., Ltd. ("Zenyaku") will be responsible for product
development, marketing and sales. The Company will receive royalties on sales
outside the United States.

NOTE 3. NOTES PAYABLE

     In February 1999, the Company raised approximately $112,673,000, net of
underwriting commissions and expenses of $3,885,000, through the private sale of
Notes. Upon maturity, the Notes will have an aggregate principal face value of
$345,000,000. The Notes were priced with a yield to maturity of 5.5 percent
annually. Each $1,000 aggregate principal face value Note is convertible at the
holders' option at any time through maturity into 6.734 shares of the Company's
common stock at an initial conversion price of $50.17. The Company is required
under the terms of the Notes, as of 35 business days after a change in control
occurring on or before February 16, 2004, to purchase any Note at the option of
its holder at a price equal to the issue price plus accrued original issue
discount to the date of purchase. Additionally, the holders of the Notes may
require the Company to purchase the Notes on February 16, 2004, 2009 or 2014 at
a price equal to the issue price plus the accrued original issue discount to the
date of purchase, with the Company having the option to repay the Notes plus the
accrued original issue discount in cash, the


                                       5
<PAGE>   8

Company's common stock or a combination thereof. At September 30, 1999, the
Notes accrued redemption value was $120,565,000. The Company has the option to
redeem the Notes any time on or after February 16, 2004.

NOTE 4. SUBSEQUENT EVENT

     In October 1999 the Company's board of directors approved a proposed
amendment and restatement of the Company's Amended and Restated Certificate of
Incorporation to increase the number of shares of authorized common stock from
50,000,000 shares to 200,000,000 shares, to halve the par value of the common
stock from $0.001 per share to $0.0005 per share and to effect a two-for-one
stock split of its common stock. All stockholders of record of the Company's
common stock at the close of business on October 18. 1999 will be entitled to
vote on the proposed amendment and restatement at a special meeting of
stockholders to be held on December 1, 1999. If the proposed amendment and
restatement of the Company's Amended and Restated Certificate of Incorporation
is approved by the required vote of stockholders, the Company anticipates that
December 1, 1999 shall be the record date for the determination of the owners of
common stock entitled to receive a certificate or certificates representing
additional shares and that additional shares will be distributed on or about
December 20, 1999. Assuming December 1, 1999 as a record date, the Company
anticipates that its common stock will trade on a split-adjusted basis on
December 2, 1999. The condensed consolidated accompanying financial statements
have not been adjusted to reflect the proposed increase in number of shares of
common stock, change in par value or stock split.


                                       6
<PAGE>   9

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

OVERVIEW

     IDEC Pharmaceuticals Corporation is primarily engaged in the
commercialization, research and development of targeted therapies for the
treatment of cancer and autoimmune diseases. In November 1997, the Company
received approval from the U.S. Food and Drug Administration ("FDA") to market
its first product, Rituxan, in the United States, and in June 1998, Roche, the
Company's European marketing partner was granted marketing authorization for
Rituximab in all European Union countries. Rituxan is the trade name in the
United States for the compound Rituximab. Outside the United States, Rituximab
is marketed as MabThera (Rituximab, Rituxan and MabThera are collectively
referred to herein as Rituxan, except where otherwise indicated). Rituxan is
being copromoted in the United States under a joint business arrangement with
Genentech, with the Company receiving a share of the pretax copromotion profits.
Under the terms of separate agreements with Genentech, commercialization of
Rituxan outside the United States is the responsibility of Roche, except in
Japan where Zenyaku will be responsible for product development, marketing and
sales. The Company receives royalties on Rituxan sales outside the United
States.

     Revenues for the Company include revenues from unconsolidated joint
business, contract revenues and license fees. Until the commercialization of
Rituxan, a substantial portion of the Company's revenues had been derived from
contract revenues and license fees. However, since the commercialization of
Rituxan in November 1997, the Company's revenues have depended primarily upon
the sale of Rituxan.

     Revenues from unconsolidated joint business consist of the Company's share
of the pretax copromotion profits generated from its joint business arrangement
with Genentech, revenue from bulk Rituxan sales to Genentech, reimbursement from
Genentech of the Company's sales force and development expenses and royalty
income from Roche on sales of Rituximab outside the United States. The Company
records its royalty income from Roche with a one-quarter lag. Under the joint
business arrangement, all U.S. sales of Rituxan and associated costs and
expenses will be recognized by Genentech, with the Company recording its share
of the pretax copromotion profits on a quarterly basis, as defined in the
Company's collaborative agreement with Genentech. Pretax copromotion
profits under the joint business arrangement are derived by taking U.S. net
sales of Rituxan to third-party customers less cost of sales, third-party
royalty expenses, distribution, selling and marketing expenses and joint
development expenses incurred by the Company and Genentech. Revenue from bulk
Rituxan sales is recognized when bulk Rituxan is accepted by Genentech. The
Company's profit-sharing formula with Genentech has two tiers; the higher tier
applies once a certain copromotion profit level is met. The profit-sharing
formula resets to the lower tier on an annual basis, at the beginning of each
year. During the second quarter, the Company began recording its 1999 profit
share at the higher tier.

     Contract revenues include nonrefundable research and development funding
under collaborative agreements with the Company's various strategic partners and
other funding under contractual arrangements with other parties. Contract
research and development funding generally compensates the Company for
discovery, preclinical and clinical expenses related to the collaborative
development programs for certain products of the Company.

     License fees include nonrefundable fees from product development milestone
payments, the sale of license rights to the Company's proprietary gene
expression technology and nonrefundable fees from the sale of product rights
under collaborative development and license agreements with the Company's
strategic partners.

     Contract revenues and license fees may vary from period to period and are
in part dependent upon achievement of certain research and development
objectives or the consummation of new corporate alliances. The magnitude and
timing of contract revenues and license fees may influence the achievement and
level of profitability for the Company.

     The cost of bulk Rituxan sold to Genentech is recorded as manufacturing
costs in the Company's condensed consolidated statements of operations. Under
the Company's agreement with Genentech, the sales price of bulk Rituxan
manufactured by the Company and sold to Genentech is capped at a price that is
less than the Company's cost to manufacture bulk Rituxan. In September 1999 the
Company transferred all manufacturing activities for bulk Rituxan to Genentech.
The Company anticipates using its available manufacturing capacity for
production of specification setting lots and commercial inventory of ZEVALIN(TM)
(formally known as IDEC-Y2B8), production of clinical material, and some
third-party contract manufacturing.


                                       7
<PAGE>   10

     The Company has incurred increasing annual operating expenses and, with the
commercialization of Rituxan, the Company expects such trends to continue. The
Company had until 1998 incurred annual operating losses since its inception in
1985 and the sustained profitability of the Company will be dependent upon the
continued commercial success of Rituxan, product development, revenues from the
achievement of product development objectives and licensing transactions. As of
September 30, 1999, the Company had an accumulated deficit of $42.4 million.

RESULTS OF OPERATIONS

     Revenues from unconsolidated joint business for the three and nine months
ended September 30, 1999 totaled $25.9 million and $66.2 million, respectively,
compared to $12.3 million and $31.0 million for the comparable periods in 1998.
Revenues from unconsolidated joint business for the three and nine months ended
September 30, 1999 and 1998 reflect the financial results from the
commercialization of Rituxan through the Company's collaboration with Genentech.
Included in these revenues are the Company's share of pretax copromotion
profits, bulk Rituxan sales to Genentech, reimbursement from Genentech of the
Company's Rituxan sales force and development expenses and royalty income on
sales of Rituxan outside the United States. Under its agreement with Genentech,
the Company's pretax copromotion profit-sharing formula has two tiers. The
higher tier applies once a certain copromotion profit level is met and will
reset to the lower tier on an annual basis, at the beginning of each year. The
Company began recording its annual copromotion profits using the higher tier in
the second quarter of 1999 as compared to the third quarter in 1998.

     Rituxan net sales to third-party customers in the United States recorded by
Genentech for the three and nine months ended September 30, 1999 amounted to
$70.2 million and $190.5 million, respectively, compared to $36.1 million and
$103.3 million for the comparable periods in 1998. The Company believes that the
growth in sales is being driven in part by increased prescribing for the
approved indication, by the re-treatment of patients who responded to Rituxan
therapy and by increased use outside of the approved indication.

     Contract revenues for the three and nine months ended September 30, 1999
totaled $4.3 million and $6.8 million, respectively, compared to $2.7 million
and $9.9 million for the comparable periods in 1998. The increase in contract
research revenues for the three months ended September 30, 1999 is a result of
increased funding under a collaboration and license agreement with Schering
Aktiengesellschaft ("Schering AG") offset by decreased research and development
funding from SmithKline Beecham p.l.c. ("SmithKline Beecham"), Seikagaku
Corporation ("Seikagaku") and Mitsubish-Tokyo Pharmaceuticals, Inc., formerly
known as Mitsubishi Chemical Corporation ("Mitsubishi"). The decrease in
contract research revenues for the nine months ended September 30, 1999 is a
result of decreased research and development funding from SmithKline Beecham,
Seikagaku and Eisai Co. Ltd. ("Eisai") offset by increased funding under a
collaboration and license agreement with Schering AG.

     There were no license fees for the three month ended September 30, 1999
compared to $2.0 million for the comparable period in 1998. License fees for the
nine months ended September 30, 1999 totaled $13.0 million compared to $18.3
million for the comparable period in 1998. License fees for the three months
ended September 30, 1998 resulted from the achievement of a product development
milestone event for the Investigational New Drug allowance of IDEC-114 under the
Company's collaboration with Mitsubishi. License fees for the nine months ended
September 30, 1999 is due to a $13.0 million upfront licensing fee from Schering
AG, for the development and commercialization of ZEVALIN outside the United
States. License fees for the nine months ended September 1998 are primarily due
to a $10.0 million product development milestone payment from Genentech for
European approval of Rituxan. Contract revenues and license fees may vary from
period to period and are, in part, dependent upon achievement of certain
research and development objectives. The magnitude and timing of contract
revenues and license fees may influence the achievement and level of
profitability for the Company. The Company continues to pursue other
collaborative and license arrangements, however, no assurance can be given that
any such arrangements will be realized.

     Manufacturing costs totaled $4.8 million and $9.7 million for the three and
nine months ended September 30, 1999, respectively, compared to $4.1 million and
$11.0 million for the comparable periods in 1998. Manufacturing costs for 1999
and 1998 relate to production of bulk Rituxan sold to Genentech. Manufacturing
costs are recognized when Genentech accepts bulk Rituxan inventory. The decrease
in manufacturing costs for the nine months ended September 30, 1999 is due to
the timing of bulk Rituxan sales to Genentech. In September 1999 the Company
transferred all manufacturing activities for bulk Rituxan to Genentech. The
Company expects to continue incurring substantial manufacturing related costs
and expenses as it anticipates using its available capacity for production of


                                       8
<PAGE>   11

specification setting lots and commercial inventory of ZEVALIN, production of
clinical material and some third-party contract manufacturing.

     Research and development expenses totaled $10.8 million and $28.2 million
for the three and nine months ended September 30, 1999, respectively, compared
to $8.0 million and $22.2 million for the comparable periods in 1998. The
increase in research and development expenses for the three and nine months
ended September 30, 1999 is primarily due to increased personnel expenses and
clinical trial expenses for the Company's products under development, offset in
part by decreased contract manufacturing and other outside service expenses. The
Company expects to continue incurring substantial additional research and
development expenses in the future, due to expansion or addition of research and
development programs; technology in-licensing and regulatory-related expenses;
preclinical and clinical testing of the Company's various products under
development; and production scale-up and manufacturing of products used in
clinical trials.

     Selling, general and administrative expenses totaled $4.6 million and $13.9
million for the three and nine months ended September 30, 1999, respectively,
compared to $3.8 million and $12.2 million for the comparable periods in 1998.
Selling, general and administrative expenses increased in 1999 due to increased
sales and marketing expenses resulting from the commercialization of Rituxan.
Selling, general and administrative expenses necessary to support sales and
administration, expanded manufacturing capacity, expanded clinical trials,
research and development and the potential expansion of the sales and marketing
organization are expected to increase in the foreseeable future.

     The Company's income tax provision totaled $0.6 million and $1.8 million
for the three and nine months ended September 30, 1999, respectively, and was
the result of an alternative minimum tax system that only allows the utilization
of net operating loss carryforwards to offset 90% of taxable income. At December
31, 1998, the Company had a valuation allowance equal to its deferred tax assets
of $47.6 million since the Company had not established a pattern of profitable
operations for tax purposes. Should the Company continue to have profitable
operations for tax purposes, the Company believes that its deferred tax assets
(comprised primarily of net operating loss carryforwards and research and
experimentation credits) may become recoverable, and therefore, the Company
anticipates that it would record tax benefits relating to the reduction of the
valuation allowance against its deferred tax assets in the fourth quarter of
1999. The Company's net operating loss carryforwards available to offset future
taxable income at December 31, 1998 were approximately $72.0 million for federal
income tax purposes. The future utilization of net operating loss carryforwards
may be limited under the Internal Revenue Code (the "IRC") due to IRC defined
ownership changes.

LIQUIDITY AND CAPITAL RESOURCES

     The Company has financed its operating and capital expenditures since
inception principally through the sale of equity securities, commercialization
of Rituxan, license fees, contract revenues, lease financing transactions, debt
and interest income. The Company expects to finance its current and planned
operating requirements principally through cash on hand, funds from its joint
business arrangement with Genentech and with funds from existing collaborative
agreements and contracts which the Company believes will be sufficient to meet
its near-term operating requirements. Existing collaborative research agreements
and contracts, however, could be canceled by the contracting parties. In
addition, the Company may, from time to time, seek additional funding through a
combination of new collaborative agreements, strategic alliances and additional
equity and debt financing or from other sources. There can be no assurance that
such additional funds will be obtained through these sources on acceptable
terms, if at all. Should the Company not enter into any such arrangements, the
Company anticipates its cash, cash equivalents and securities
available-for-sale, together with the existing agreements and joint business
arrangement, will be sufficient to finance the Company's currently anticipated
needs for operating and capital expenditures for the foreseeable future. If
adequate funds are not available from the joint business arrangement, operations
or additional sources of financing, the Company's business could be materially
and adversely affected.

     The Company's working capital and capital requirements will depend upon
numerous factors, including: the continued commercial success of Rituxan;
progress of the Company's preclinical and clinical testing; fluctuating or
increasing manufacturing requirements and research and development programs;
timing and expense of obtaining regulatory approvals; levels of resources that
the Company devotes to the development of manufacturing, sales and marketing
capabilities; technological advances; status of competitors; and the ability of
the Company to establish collaborative arrangements with other organizations.


                                       9
<PAGE>   12

     Until required for operations, the Company's policy under established
guidelines is to keep its cash reserves in bank deposits, certificates of
deposit, commercial paper, corporate notes, United States government instruments
and other readily marketable debt instruments, all of which are investment-grade
quality.

     At September 30, 1999, the Company had $230.0 million in cash, cash
equivalents and securities available-for-sale compared to $73.5 million at
December 31, 1998. Sources of cash, cash equivalents and securities
available-for-sale during the nine months ended September 30, 1999, include
$112.7 million from the Notes offering discussed below, $38.1 million from
operations and $10.5 million from the issuance of common stock under
employee stock option and purchase plans. Uses of cash, cash equivalents and
securities available-for-sale during the nine months ended September 30, 1999,
included $2.7 million used to purchase capital equipment and $1.4 million used
to pay notes payable.

     In February 1999, the Company raised approximately $112.7 million, net of
underwriting commissions and expenses of $3.8 million, through the private sale
of the Notes. The Notes were priced with a yield to maturity of 5.5 percent
annually. Upon maturity, the Notes will have an aggregate principal face value
of $345.0 million. Each $1,000 aggregate principal face value Note is
convertible at the holders' option at any time through maturity into 6.734
shares of the Company's common stock at an initial conversion price of $50.17.
The Company is required under the terms of the Notes, as of 35 business days
after a change in control occurring on or before February 16, 2004, to purchase
any Note at the option of its holder at a price equal to the issue price plus
accrued original issue discount to the date of purchase. Additionally, the
holders of the Notes may require the Company to purchase the Notes on February
16, 2004, 2009 or 2014 at a price equal to the issue price plus accrued original
issue discount to the date of purchase with the Company having the option to
repay the Notes plus accrued original issue discount in cash, the Company's
common stock or a combination thereof. At September 30, 1999, the Notes accrued
redemption value was $120.6 million. The Company has the right to redeem the
Notes on or after February 16, 2004.

     In September 1997, the Company and Cytokine Pharmasciences, Inc., formally
known as Cytokine Networks, Inc. ("CPI"), entered into a development and license
agreement. Under the terms of the development and license agreement with CPI,
the Company may make payments to CPI totaling up to $10.5 million, subject to
attainment of certain product development milestone events, of which $3.0
million has been paid through September 30, 1999.

     In August 1999, the Company announced it terminated its development of
9-aminocamptothecin ("9-AC"), following a Phase II clinical trial. The Company
concluded that 9-AC would not yield the desired benefits to solid-tumor cancer
patients. The Company acquired 9-AC from Pharmacia & Upjohn S.p.A. ("Pharmacia &
Upjohn") and would have paid $6.0 million to Pharmacia & Upjohn had it taken
9-AC into a Phase III clinical trial and $7.0 million if 9-AC had been approved
by the FDA.

YEAR 2000 COMPLIANCE

     Many information technology based systems and software products were
designed to accept and track only two digit year entries in the date field (i.e.
"99" for 1999). This causes an ambiguity when handling dates in and after the
year 2000. Some systems also used specific dates (such as 9/9/99) to indicate
special issues such as deleted data. Some programs also miscalculate the leap
year 2000. This could cause system or equipment shutdowns, failures or
miscalculations resulting in inaccuracies in data exchanges, computer output or
disruptions of operations. As a result, information technology based systems
and/or software used by many companies may need to be upgraded to properly
address such "Year 2000" issues.

     The Company has an ongoing Year 2000 Program and has appointed a Year 2000
Program Manager and a Year 2000 Task Force. The Company has completed an
inventory and review of information technology based system hardware, operating
systems (including manufacturing and laboratory control systems) and application
software in order to identify potential Year 2000 problems and has almost
completed implementing planned upgrades and testing its systems. The Company
believes that it has corrected over 90% of identified noncompliant items. The
Company currently estimates that the financial impact of system and software
modifications will not exceed $1.0 million including costs already incurred,
however, the actual financial cost of correcting Year 2000 problems could exceed
this estimate. If modifications are not made or not completed in a timely
fashion, Year 2000 problems could have a material adverse impact on the
Company's business, financial condition and results of operations, the precise
degree of which cannot be known at this time. The Company's Year 2000 Program
includes sending inquiries to major third-party suppliers, manufacturers,
service providers and business partners seeking assurance that they are Year
2000 compliant. The Company's business, financial condition and results of
operations could be materially adversely


                                       10
<PAGE>   13
 affected if third-party suppliers, manufacturers, service providers, business
partners and other entities, including government entities, do not adequately
address their Year 2000 issues.

     The Company is currently relying upon Genentech to provide for all Year
2000-related reviews, upgrades and contingency plans relating to the
manufacture, distribution and sale of Rituxan. The Company has not received
contingency plans from Genentech. Genentech, however, reports that it initiated
contingency planning in March 1999 for business critical processes, which
include provisions such as identifying alternate sources for materials and
services and if necessary reverting to non-computerized systems for processing
information. Genentech reports that its contingency plan is approximately 80%
complete and is scheduled for completion by the end of November 1999. Genentech
believes that with the completion of modifications, the Year 2000 issue will not
pose significant operational problems for their computer systems and equipment.
Any failure by Genentech to complete modifications or address issues, including
issues with third-parties, which results in their inability to timely produce,
distribute and sell Rituxan would have a material adverse impact to the
Company's business, financial condition and results of operations, the precise
degree of which cannot be known at this time.

     The Company has begun to put into place contingency plans to deal with
non-Rituxan related failures resulting from Year 2000 issues. The Company
expects to complete its contingency plans during the fourth quarter of 1999.


                                       11
<PAGE>   14

                                  RISK FACTORS

     This Form 10-Q contains forward-looking statements that involve a number of
risks and uncertainties. You should be aware that such statements are
projections or estimates as to future events, which may or may not occur. When
used in this Form 10-Q, the terms "we", "our", and "us" refer to the Company.

     In addition to the other information in this Form 10-Q, you should
carefully consider the following risk factors. If any of these risks actually
occur, our business, financial condition and results of operations could be
materially adversely affected. The risks and uncertainties described below are
not the only ones facing our company, and additional risks and uncertainties may
also impair our business operations.

OUR REVENUES RELY SIGNIFICANTLY ON RITUXAN SALES

     Our revenues currently depend largely upon continued U.S. sales of a single
commercialized product, Rituxan. We cannot be certain that Rituxan will continue
to be accepted in the United States or in any foreign markets. A number of
factors may affect the rate and level of market acceptance of Rituxan,
including:

          o    the perception by physicians and other members of the health care
               community of its safety and efficacy or that of competing
               products, if any;

          o    the effectiveness of our and Genentech's sales and marketing
               efforts in the United States and the effectiveness of Roche's
               sales and marketing efforts in Europe;

          o    unfavorable publicity concerning Rituxan or comparable drugs;

          o    its price relative to other drugs or competing treatments;

          o    the availability of third-party reimbursement; and

          o    regulatory developments related to the manufacture or continued
               use of Rituxan.

     We incurred annual operating losses from our inception in 1985 through
fiscal 1997. Given our current reliance upon Rituxan as the principal source of
our revenue, any material adverse developments with respect to the
commercialization of Rituxan may cause us to incur losses in the future.

OUR OPERATING RESULTS ARE SUBJECT TO SIGNIFICANT FLUCTUATIONS

     Our quarterly revenues, expenses and operating results have fluctuated in
the past and are likely to fluctuate significantly in the future. Fluctuation
may result from a variety of factors, including:

          o    our achievement of product development objectives and milestones;

          o    demand and pricing for our commercialized products, such as
               Rituxan;

          o    our ability to utilize excess manufacturing capacity by obtaining
               contract manufacturing relationships;

          o    timing and nature of contract manufacturing and contract research
               and development payments and receipts;

          o    hospital and pharmacy buying decisions;

          o    clinical trial enrollment and expenses;

          o    physician acceptance of our products;

          o    government or private healthcare reimbursement policies;

          o    our manufacturing performance and capacity and that of our
               partners;

          o    the amount and timing of sales orders of Rituxan by Genentech to
               customers in the United States and by Roche to customers in
               Europe;

          o    rate and success of product approvals;

          o    collaboration obligations and copromotion payments we make or
               receive;

          o    foreign currency exchange rates; and

          o    overall economic conditions.


                                       12
<PAGE>   15

     Our operating results during any one quarter do not necessarily suggest
those of future quarters. These results fluctuate periodically because our
revenues are driven by certain events such as achievement of product development
milestone events and the applicable profit sharing allocation between us and
Genentech, based upon our copromotion arrangement.

VOLATILITY OF OUR STOCK PRICE

     The market prices for our common stock and for securities of other
companies engaged primarily in biotechnology and pharmaceutical development,
manufacture and distribution are highly volatile. For example, the market price
of our common stock fluctuated between $27 3/8 per share and $145 1/2 per share
during the twelve months ended October 31, 1999. The market price of our common
stock will likely continue to fluctuate due to a variety of factors, including:

          o    material public announcements;

          o    the announcement and timing of new product introductions by us or
               others;

          o    technical innovations or product development by us or our
               competitors;

          o    regulatory approvals or regulatory issues;

          o    developments relating to patents, proprietary rights and orphan
               drug status;

          o    actual or potential clinical results with respect to our products
               under development or those of our competitors;

          o    political developments or proposed legislation in the
               pharmaceutical or healthcare industry;

          o    economic and other external factors or other disaster or crisis;

          o    hedge and/or arbitrage activities by holders of our Notes;

          o    period to period fluctuations in our financial results;

          o    the proposed two-for-one stock split of our common stock and
               proposed increase in the number of authorized shares of our
               common stock; and

          o    market trends relating to or affecting stock prices throughout
               our industry, whether or not related to results or news regarding
               us or our competitors.

WE FACE UNCERTAIN RESULTS OF CLINICAL TRIALS OF OUR POTENTIAL PRODUCTS

     Our future success depends in large part upon the results of clinical
trials designed to assess the safety and efficacy of our potential products. The
completion rate of these clinical trials depends significantly upon the rate of
patient enrollment. Factors that affect patient enrollment include:

          o    size of patient population for the targeted disease;

          o    eligibility criteria;

          o    proximity of eligible patients to clinical sites;

          o    clinical trial protocols; and

          o    the existence of competing protocols (including competitive
               financial incentives for patients and clinicians) and existing
               approved drugs (including Rituxan).

     Our inability to enroll patients on a timely basis could result in
increased expenses and product development delays, which could have a material
adverse effect on our business, results of operations and financial condition.
Even if a trial is fully enrolled, significant uncertainties remain as to
whether it will prove successful. For example, we recently terminated our
development of 9-AC following a Phase II clinical trial. We concluded that 9-AC
would not yield the desired benefit to solid-tumor cancer patients. In addition,
IDEC-151 was first clinically tested in Phase I and Phase I/II clinical trials
for rheumatoid arthritis in collaboration with our partner, SmithKline Beecham.
In February 1999, we announced that SmithKline Beecham was discontinuing
development efforts for IDEC-151 in rheumatoid arthritis. The Company and
SmithKline Beecham are currently re-evaluating the clinical strategies for
IDEC-151, including responsibility for development and whether or not to pursue
studies in psoriasis, rheumatoid arthritis and/or other potential indications.
We are also discussing with SmithKline Beecham the return of all anti-CD4
program rights to us. This would allow us to proceed independently, if at all,
on new strategies for IDEC-151 and related anti-CD4 products.

                                       13
<PAGE>   16

     The FDA regulates clinical trials. Failure to comply with extensive FDA
regulations may result in delay, suspension or cancellation of a trial and/or
the FDA's refusal to accept test results. The FDA may also suspend our clinical
trials at any time if it concludes that the participants are being exposed to
unacceptable risks. Consequently, we cannot ensure that Phase I, Phase II or
Phase III testing will be completed timely or successfully, if at all, with
respect to any of our potential products. Furthermore, we cannot be certain that
patients enrolled in our clinical trials will respond to our product candidates,
that any product candidate will be safe and effective or that data derived from
the trials will be suitable for submission to the FDA or satisfactorily support
a biologics licensing application ("BLA") or a new drug application ("NDA").

WE MAY BE UNABLE TO DEVELOP AND COMMERCIALIZE NEW PRODUCTS

     Our future results of operations will depend to a large extent upon our
ability to successfully commercialize new products in a timely manner. As a
result, we must continue to develop, test and manufacture new products and then
must meet regulatory standards and obtain regulatory approvals. Our products
currently in development may not receive the regulatory approvals necessary for
marketing in a timely manner, if at all. Additionally, the development and
commercialization process is time-consuming and costly, and we cannot be certain
that any of our products, if and when developed and approved, will be
successfully commercialized. Delays or unanticipated costs in any part of the
process, our inability to obtain regulatory approval for our products or to
maintain manufacturing facilities in compliance with all applicable regulatory
requirements could adversely affect our results of operations.

WE RELY HEAVILY ON CONTRACT MANUFACTURERS

     We rely heavily upon third-party manufacturers to manufacture significant
portions of our products and product candidates. Our own manufacturing capacity
is limited and we are capable of producing only a limited quantity of bulk
Rituxan and other product candidates. Our manufacturing experience to date has
been limited to the production of preclinical and clinical quantities of product
candidates and to approximately three years of commercial production of bulk
Rituxan. We have no fill/finish experience or capacity and we do not have
experience in the field of chelates or radioisotopes and therefore, we rely
entirely upon third parties for the manufacture of these products and
components. Consequently, we cannot ensure that either our manufacturing
facilities or our ability to sustain ongoing production of our products will be
able to meet our expectations. Nor can we be certain that we will be able to
enter into satisfactory agreements with third-party manufacturers. Our failure
to enter into agreements with such manufacturers on reasonable terms, if at all,
or poor manufacturing performance on our part or that of our third-party
manufacturers could have a material and adverse effect on our business,
financial condition and results of operations.

     In September 1999 we transferred all manufacturing of bulk Rituxan to
Genentech. We rely upon Genentech for all Rituxan manufacturing in order to meet
worldwide requirements and to complete all fill/finish requirements. We cannot
ensure that Genentech will manufacture and fill/finish Rituxan in sufficient
quantities and on a timely and cost-effective basis or that Genentech will
obtain and maintain all required manufacturing approvals. Genentech's failure to
manufacture and fill/finish Rituxan or obtain and maintain required
manufacturing approvals could materially and adversely affect our business,
results of operations and financial condition.

     ZEVALIN has multiple components that require successful coordination among
several third-party contract manufacturers. We are currently negotiating with
commercial contractors to meet our long-term manufacturing demands for
fill/finish of ZEVALIN bulk product. We cannot be certain that we will reach
agreement on reasonable terms, if at all, with our contract manufacturers or
that the integration of our contract manufacturers can be successfully
coordinated.

     Since the completion in September 1999 of our obligation to manufacture
bulk Rituxan, we have commenced conversion of our manufacturing facility to a
multi-product facility, where we will initially manufacture ZEVALIN and
anti-CD40L (also known as anti-gp39) antibodies. We cannot be certain that this
conversion will be successful, that it will receive all necessary regulatory
approvals, or that, even if it is successful and such approvals are received, it
will be completed within our budgeted time and expense estimations. Our failure
to successfully convert the manufacturing facility in a timely manner could have
an adverse effect on our product development efforts and our ability to timely
file our product license applications and could cause us to incur significant
unabsorbed overhead costs. To the extent we cannot produce our own biologics, we
will need to rely on third-party manufacturers, of which there are only a
limited number capable of manufacturing biologics as contract suppliers. We
cannot be certain that we could reach agreement on reasonable terms, if at all,
with those manufacturers.


                                       14
<PAGE>   17

WE RELY HEAVILY ON CERTAIN SUPPLIERS

     Some materials used in our products and potential products, including
Rituxan and ZEVALIN, are currently available only from sole or limited number of
suppliers. In addition, the suppliers of some materials for our products must be
approved by the FDA and/or by other governmental agencies. Although we have
initiated a program for identifying alternative suppliers for certain materials,
any interruption or delay in our supply of materials or delays in the applicable
governmental approval of new suppliers or any loss of a sole source supplier
could have a material adverse effect on our business, financial condition and
results of operations.

OUR INDUSTRY IS INTENSELY COMPETITIVE

     The biotechnology industry is intensely competitive. We compete with
biotechnology and pharmaceutical companies that have been established longer
than we have, have a greater number of products on the market, have greater
financial and other resources and have other technological or competitive
advantages. We also compete in the development of technologies and processes and
in acquiring personnel and technology from academic institutions, government
agencies, and other private and public research organizations. Consequently, we
cannot be certain that we will be able to produce or acquire rights to new
products with commercial potential. In addition, we cannot be certain that one
or more of our competitors will not receive patent protection that dominates,
blocks or adversely affects our product development or business; will benefit
from significantly greater sales and marketing capabilities; or will not develop
products that are accepted more widely than ours. We are aware that a competitor
recently filed a BLA for a radiolabeled murine antibody product for the
treatment of non-Hodgkin's lymphomas. We are also aware of other potentially
competitive biologic therapies for non-Hodgkin's lymphomas in development.

WE HAVE LIMITED SALES AND MARKETING EXPERIENCE

     We have limited experience with commercial sales and marketing, based
entirely upon our launch and subsequent sales of Rituxan. Outside the United
States, our strategy is to pursue and to rely solely upon collaborations with
established pharmaceutical companies for marketing, distribution and sale of our
products. We currently have no plans to directly market outside the United
States. Since we currently rely upon copromotion partners in the United States
and rely exclusively on third parties outside the United States, we cannot be
certain that our products will be marketed and distributed in accordance with
our expectations or that our market research or sales forecasts will be
accurate. We also cannot be certain that we will ever be able to develop our own
sales and marketing capabilities to an extent that we would not need to rely on
third-party efforts, or that we will be able to maintain satisfactory
arrangements with the third-parties on whom we rely.

WE MAY BE UNABLE TO ADEQUATELY PROTECT OR ENFORCE OUR INTELLECTUAL PROPERTY
RIGHTS OR SECURE RIGHTS TO THIRD-PARTY PATENTS

     Our ability and the abilities of our partners to obtain and maintain patent
and other protection for our products will affect their success. We are assigned
or have rights to or have exclusive access to a number of U.S. and foreign
patents, patents pending and patent applications. However, we cannot be certain
that such patent applications will be approved, or that any of our patent rights
will be upheld in a court of law if challenged. We also cannot be certain that
our patent rights will provide competitive advantages for our products or will
not be challenged, infringed upon or circumvented by our competitors.

     Because of the large number of patent filings in the biopharmaceutical
field, our competitors may have filed applications or been issued patents and
may obtain additional patents and proprietary rights relating to products or
processes competitive with or similar to ours. We cannot be certain that U.S. or
foreign patents do not exist or will not issue that would materially and
adversely affect our ability to commercialize our products and product
candidates.

     In addition to patents, we rely on trade secrets and proprietary know-how
that we seek to protect, in part, through confidentiality agreements with our
partners, employees and consultants. It is possible that such parties will
breach our agreements or that courts may not enforce the agreements, leaving us
without adequate remedies. We also cannot be certain that our trade secrets will
not become known or be independently developed or patented by our competitors.


                                       15
<PAGE>   18

     In September 1999, an interference to determine priority of inventorship
was declared in the United States Patent and Trademark Office between Dartmouth
University's patent application (which patent application has been exclusively
licensed to us) and Columbia University's patent (which patent we believe has
been exclusively licensed to Biogen) relating to anti-CD40L antibodies. We are
aware that oppositions have been filed to a granted Japanese Immunex patent
relating to anti-CD40L antibodies. We are also aware that an opposition has been
recently filed in the European patent office to a granted European application
that has been licensed to us, which application contains claims relating to the
use of anti-CD40L antibodies as a therapeutic. Also, we are aware of an
opposition that was recently filed to a granted European patent application
which names us as the applicant and which relates to PROVAX and therapeutic use
thereof. If the outcome of the interference or any of the oppositions is
adverse, in whole or in part, it could result in the scope of some or all of the
granted claims being limited, some or all of the granted claims being lost,
and/or the granted patent application(s) not proceeding to a patent.

     We are aware of several third-party patents and patent applications (to the
extent they issue as patents) that, if successfully asserted against us, may
materially affect our ability to make, use, offer to sell, sell and import our
products. These third-party patents and, patent applications may include,
without limitation:

          o    U.S. patent and patent applications and foreign counterparts
               filed by Bristol-Myers Company that relate to antibodies to a B7
               antigen;

          o    a U.S. patent assigned to Columbia University and a Japanese
               patent assigned to Immunex, which we believe have been
               exclusively licensed to Biogen, related to monoclonal antibodies
               to the 5C8 antigen found on T cells. We believe the 5C8 antigen
               is associated with CD40L, the target for our anti-CD40L
               antibodies expressed on the surface of activated T cells;

          o    a number of issued U.S. and foreign patents that relate to
               various aspects of radioimmunotherapy of cancer and to methods of
               treating patients with anti-CD4 antibodies;

          o    two U.S. patents assigned to Glaxo Wellcome and foreign
               counterparts relating to chelator stabilized antibody
               preparations; and

          o    three U.S. patents assigned to Glaxo Wellcome and foreign
               counterparts relating to therapeutic uses of CHO glycosylated
               antibodies.

     The owners, or licensees of the owners, of these patents and patent
applications (to the extent they issue as patents) may assert that one or more
of our products infringe one or more claims of such patents. Such owners or
licensees of foreign counterparts to these patents and any other foreign patents
may assert that one or more of our products infringe one or more claims of such
patents. Specifically, if legal action is commenced against us or our partners
to enforce any of these patents and patent applications (to the extent they
issue as patents) and the plaintiff in such action prevails, we could be
prevented from practicing the subject matter claimed in such patents or patent
applications.

     We are aware that on May 28, 1999, Glaxo Wellcome filed a patent
infringement lawsuit against Genentech in the U.S. District Court in Delaware.
According to Genentech's Form 10-Q for the quarter ended September 30, 1999,
that suit asserts that Genentech infringes four U.S. patents owned by Glaxo
Wellcome. Two of the patents relate to the use of specific kinds of monoclonal
antibodies for the treatment of human disease, including cancer. The other two
patents asserted against Genentech relate to preparations of specific kinds of
monoclonal antibodies which are made more stable and the methods by which such
preparations are made. Genentech believes that the suit relates to the
manufacture, use and sale of their Herceptin product and Rituxan. The judge has
scheduled the trial of this suit to begin January 29, 2001. Based upon the
nature of the claims made and the information available to Genentech, Genentech
reports that it believes that the outcome of this action is not likely to have a
material adverse effect on their financial position, results of operations or
cash flows, but that if an unfavorable ruling were to occur in any quarterly
period, there exists the possibility of a material impact on Genentech's net
income of that period. If the suit relates to the manufacture, use and sale of
Rituxan, and depending on the suit's outcome, there exists the possibility of a
material impact on our corresponding period copromotion profit related to
Rituxan and a material adverse effect on our business, financial condition and
results of operations.

     If our intellectual property rights are challenged, we may be required or
may desire to obtain licenses to patents and other intellectual property held by
third-parties to develop, manufacture and market our products. However, we
cannot be certain that we will be able to obtain these licenses on commercially
reasonable terms, if at all, or that any licensed patents or intellectual
property will be valid or enforceable. In addition, the scope of intellectual
property protection is subject to scrutiny and change by courts and other
governmental bodies. Litigation and other proceedings concerning patents and
proprietary technologies can be protracted, expensive and distracting to


                                       16
<PAGE>   19

management and companies may sue competitors as a way of delaying the
introduction of competitors' products. Any litigation, including any
interference proceeding to determine priority of inventions, oppositions to
patents in foreign countries or litigation against our partners, may be costly
and time-consuming and could have a material adverse effect on our business,
financial condition and results of operations.

WE MAY BE UNABLE TO MAINTAIN THIRD-PARTY RESEARCH AND DEVELOPMENT RELATIONSHIPS

     Funding of research and development efforts depends largely upon various
arrangements with strategic partners and others who provide us with funding and
who perform research and development with respect to our products. Such
strategic partners may generally terminate their arrangement with us at any
time. These parties may develop products that compete with ours, and we cannot
be certain that they will perform their contractual obligations or that any
revenues will be derived from such arrangements. If one or more of our strategic
partners fail to achieve certain product development objectives, such failure
could have a material adverse effect on our ability to fund related programs and
develop products.

FAILURE TO OBTAIN PRODUCT APPROVALS OR COMPLY WITH GOVERNMENT REGULATIONS COULD
ADVERSELY AFFECT OUR BUSINESS

     As pharmaceutical manufacturers, our partners and we are subject to
extensive, complex, costly and evolving governmental rules, regulations and
restrictions administered by the FDA, by other federal and state agencies, and
by governmental authorities in other countries. In the United States, our
products cannot be marketed until after they are approved by the FDA. Obtaining
an FDA approval involves the submission, among other information, of the results
of preclinical and clinical studies on the product, and requires substantial
time, effort and financial resources. Rituxan is our only product that has
received FDA approval, and we cannot be certain that any of our product
candidates will be approved either in the United States or in other countries in
a timely fashion, if at all. Both before and after approval, we are subject to
numerous other FDA requirements, and to government inspection at all times. Our
failure to meet or comply with any rules, regulations or restrictions of the FDA
or other agencies could result in fines, unanticipated expenditures, product
delays, non-approval or recall, interruption of production and even criminal
prosecution. Although we have instituted internal compliance programs and
continue to address compliance issues from time to time by the FDA, we cannot
be certain that we will meet regulatory agency standards or that any
lack of compliance will not have a material adverse effect on our business,
financial condition or results of operations.

OUR BUSINESS EXPOSES US TO PRODUCT LIABILITY CLAIMS

     Our design, testing, development, manufacture and marketing of products
involves an inherent risk of exposure to product liability claims and related
adverse publicity. Insurance coverage is expensive and difficult to obtain, and
we may be unable to obtain coverage in the future on acceptable terms, if at
all. Although we currently maintain product liability insurance for our products
in the amounts we believe to be commercially reasonable, we cannot be certain
that the coverage limits of our insurance policies or those of our strategic
partners will be adequate. If we are unable to obtain sufficient insurance at an
acceptable cost or if a claim is brought against us, whether fully covered by
insurance or not, our business, results of operations and financial condition
could be materially adversely affected.

FAILURE TO ADEQUATELY ADDRESS THE YEAR 2000 ISSUE COULD ADVERSELY AFFECT OUR
BUSINESS

     We have assessed and continue to assess the potential impact of the
situation commonly referred to as the Year 2000 Issue. The Year 2000 Issue
concerns the inability of many information technology based systems and software
products to properly recognize and process date sensitive information. This
could cause system or equipment shutdowns, failures or miscalculations resulting
in inaccuracies in data exchange, computer output or disruptions of operations.
As a result, information technology based systems and/or software used by many
companies may need to be modified and upgraded.

     We have an ongoing Year 2000 Program and have appointed a Year 2000 Program
Manager and a Year 2000 Task Force. We have completed an inventory and review of
information technology based system hardware, operating systems (including
manufacturing and laboratory control systems) and application software in order
to identify potential Year 2000 problems and we have almost completed
implementing planned upgrades and testing our systems. We believe that we have
corrected over 90% of identified noncompliant items. We currently estimate that
the financial impact of making system and software modifications will not exceed
$1.0 million including costs already incurred, however, the actual financial
cost of correcting Year 2000 problems could exceed this estimate. If


                                       17
<PAGE>   20
 modifications are not made or not completed in a timely fashion, Year 2000
problems could have a material adverse impact to our business, financial
condition and results of operations, the precise degree of which cannot be known
at this time. Our Year 2000 program includes sending inquiries to our major
third-party suppliers, manufacturers, service providers and business partners
seeking assurance that they are Year 2000 compliant. Our business, financial
condition and results of operations could be materially adversely affected if
third-party suppliers, manufacturers, service providers, business partners and
other entities, including government entities, do not adequately address their
Year 2000 issues.

     We are currently relying upon Genentech to provide for all Year
2000-related reviews, upgrades and contingency plans relating to the
manufacture, distribution and sale of Rituxan. We have not received contingency
plans from Genentech. Genentech, however, reports that it initiated contingency
planning in March 1999 for business critical processes, which include provisions
such as identifying alternate sources for materials and services and if
necessary reverting to non-computerized systems for processing information.
Genentech reports that its contingency plan is approximately 80% complete and is
scheduled for completion by the end of November 1999. Genentech believes that
with the completion of modifications, the Year 2000 issue will not pose
significant operational problems for their computer systems and equipment. Any
failure by Genentech to complete modifications or address issues, including
issues with third-parties, which results in their inability to timely produce,
distribute and sell Rituxan would have a material adverse impact to our
business, financial condition and results of operation, the precise degree of
which cannot be known at this time.

     We have begun to put into place contingency plans to deal with non-Rituxan
related failures resulting from Year 2000 issues. We expect to complete our
contingency plans during the fourth quarter of 1999.

WE MAY BE UNABLE TO RAISE ADDITIONAL CAPITAL OR TO REPURCHASE THE ZERO COUPON
SUBORDINATED CONVERTIBLE NOTES

     We expend and will likely continue to expend substantial funds to complete
the research, development, manufacturing and marketing of our potential future
products. Consequently, we may seek to raise capital through collaborative
arrangements, strategic alliances, and/or equity and debt financings or from
other sources. We may be unable to raise additional capital on commercially
acceptable terms, if at all, and if we raise capital through equity financing
then existing stockholders may have their ownership interests diluted. If we are
unable to generate adequate funds from operations or from additional sources,
then our business, results of operations and financial condition may be
materially and adversely affected.

     If we undergo certain events constituting a change of control prior to
February 16, 2004, we will be obligated to repurchase all outstanding Notes at
the option of the holder. However, it is possible that we will not have
sufficient funds at that time, will not be able to raise sufficient funds, or
that restrictions in our indebtedness will not allow such repurchases. In
addition, certain major corporate events that would increase our indebtedness,
such as leveraged recapitalizations, would not constitute a change of control
under the Indenture entered into in connection with the offering of the Notes.

FUTURE TRANSACTIONS MAY ADVERSELY AFFECT OUR BUSINESS OR THE MARKET PRICE OF
SECURITIES

     We regularly review potential transactions related to technologies,
products or product rights and businesses complementary to our business. Such
transactions could include mergers, acquisitions, strategic alliances,
off-balance sheet financings, licensing agreements or copromotion agreements. We
may choose to enter into one or more of such transactions at any time, which may
cause substantial fluctuations to the market price of securities that we have
issued. Moreover, depending upon the nature of any transaction, we may
experience a charge to earnings, which could also have a material adverse impact
upon the market price of securities that we have issued.

WE RELY UPON CERTAIN KEY PERSONNEL

     Our success will depend, to a great extent, upon the experience, abilities
and continued services of our executive officers and key scientific personnel.
We do not carry key-man life insurance on any of our officers or personnel. If
we lose the services of any of these officers or key scientific personnel, we
could suffer a material adverse effect on our business, financial condition and
results of operations. Our success also will depend upon our ability to attract
and retain other highly qualified scientific, managerial, sales and
manufacturing personnel and our ability to develop and maintain relationships
with qualified clinical researchers. Competition for such personnel and
relationships is intense and we compete with numerous pharmaceutical and
biotechnology companies as well as with universities and


                                       18
<PAGE>   21

non-profit research organizations. We cannot be certain that we will be able to
continue to attract and retain qualified personnel or develop and maintain
relationships with clinical researchers.

WE ARE SUBJECT TO UNCERTAINTIES REGARDING HEALTH CARE REIMBURSEMENT AND REFORM

     Our ability to commercialize products depends in part on the extent to
which patients are reimbursed by governmental agencies, private health insurers
and other organizations, such as health maintenance organizations, for the cost
of such products and related treatments. Our business, results of operations and
financial condition could be materially adversely affected if health care payers
and providers implement cost-containment measures and governmental agencies
implement healthcare reform.

OUR BUSINESS INVOLVES ENVIRONMENTAL RISKS

     Our business and the business of several of our strategic partners,
including Genentech, involves the controlled use of hazardous materials,
chemicals, biologics and radioactive compounds. Biologics manufacture is
extremely susceptible to product loss due to microbial or viral contamination,
material equipment failure, or vendor or operator error. Although we believe
that our safety procedures for handling and disposing of such materials complies
with state and federal standards, there will always be the risk of accidental
contamination or injury. In addition, certain microbial or viral contamination
may cause the closure of the respective manufacturing facility for an extended
period of time. By law, radioactive materials may only be disposed of at state
approved facilities. We currently store our radioactive materials on-site
because the approval of a disposal site in California for all California-based
companies has been delayed indefinitely. If and when a disposal site is
approved, we may incur substantial costs related to the disposal of such
material. If liable for an accident, or if we suffer an extended facility
shutdown, we could incur significant costs, damages and penalties that could
have a material adverse effect on our business, financial condition and results
of operations.

THE ZERO COUPON SUBORDINATED CONVERTIBLE NOTES LEVERAGE US CONSIDERABLY

     As a result of issuing the Notes in February 1999, we raised approximately
$112.7 million, net of underwriting commissions and expenses of $3.8 million by
incurring indebtedness of $345.0 million at maturity. As a result of this
indebtedness, our principal and interest obligations increased substantially.
The degree to which we are leveraged could materially adversely affect our
ability to obtain future financing and could make us more vulnerable to industry
downturns and competitive pressures. Our ability to meet our debt obligations
will be dependent upon our future performance, which will be subject to
financial, business and other factors affecting our operations, many of which
are beyond our control. The holders of the Notes may require us to purchase the
Notes on February 16, 2004, 2009, 2014 at a price equal to the issue price plus
accrued original issue discount to the date of purchase. We have the option to
repay the Notes plus accrued original issue discount in cash, our common stock
or a combination thereof. At September 30, 1999, the Notes accrued redemption
value was $120.6 million. We have the right to redeem the Notes on or after
February 16, 2004.

     In addition, in the event of our insolvency, bankruptcy, liquidation,
reorganization, dissolution or winding up or upon our default in payment with
respect to any indebtedness or an event of default with respect to such
indebtedness resulting in the acceleration thereof, our assets will be available
to pay the amounts due on the Notes only after all our senior indebtedness has
been paid in full. Moreover, holders of common stock would only receive the
assets remaining after payment of all indebtedness and preferred stock, if any.

WE HAVE ADOPTED SEVERAL ANTITAKEOVER MEASURES AND THE ZERO COUPON SUBORDINATED
CONVERTIBLE NOTES MAY HAVE FURTHER ANTITAKEOVER EFFECT

     We have taken a number of actions that could have the effect of
discouraging a takeover attempt that might be beneficial to stockholders who
wish to receive a premium for their shares from a potential bidder. For example,
we reincorporated into Delaware, which subjects us to Section 203 of the
Delaware General Corporation Law, providing that the Company may not enter into
a "business combination" with an "interested stockholder" for a period of three
years after the date of the transaction in which the person became an interested
stockholder, unless the business combination is approved in the manner
prescribed in the code section. In addition, we have adopted a Stockholder
Rights Plan that would cause substantial dilution to a person who attempts to
acquire our company on terms not approved by our Board of Directors. In
addition, our Board of Directors has the authority to issue, without vote or
action of stockholders, up to 8,000,000 shares of preferred stock and to fix the
price, rights, preferences and privileges of those shares. Any such preferred
stock could contain dividend rights, conversion rights, voting rights,


                                       19
<PAGE>   22

terms of redemption, redemption prices, liquidation preferences or other rights
superior to the rights of holders of common stock. The Board of Directors has no
present intention of issuing any additional shares of preferred stock (217,514
shares of non-voting convertible preferred stock convertible into 1,390,793
shares of common stock, were outstanding as of September 30, 1999), but reserves
the right to do so in the future. In addition, our copromotion arrangement with
Genentech provides Genentech with the option to buy the rights to Rituxan in the
event that we undergo a change of control, which may limit our attractiveness to
potential acquirors.

     We are required by the terms of the Notes, as of 35 business days after a
change in control occurring on or before February 16, 2004, to purchase any Note
at the option of its holder and at a price equal to the issue price plus accrued
original issue discount to the date of repurchase. This feature of the Notes may
have an antitakeover effect.

WE HAVE NOT PAID AND DO NOT PLAN TO PAY DIVIDENDS

     We have never declared or paid cash dividends on our common stock. We
currently plan to retain any earnings for use in our business and therefore do
not anticipate paying any dividends in the future.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.

     The Company is exposed to a variety of risks, including changes in interest
rates affecting the return on its investments and the cost of its debt. At
September 30, 1999 there have not been any material changes in market risk as
reported by the Company in its Annual Report on Form 10-K for the year ended
December 31, 1998 except as to the market risk associated with the Notes issued
in February 1999.

     Due to the fixed rate nature of the Notes, an immediate 10% change in
interest rates would not have a material impact on the Company's financial
condition or the results of its operations.

     Underlying market risk exists related to an increase in the Company's stock
price or an increase in interest rates which may make conversion of the Notes to
common stock beneficial to the Notes holder. Conversion of the Notes would have
a dilutive effect on the Company's earnings per share and book value per common
share.



                                       20
<PAGE>   23

                          PART II -- OTHER INFORMATION


ITEM 1.    LEGAL PROCEEDINGS.  None

ITEM 2.    CHANGES IN SECURITIES.  None

ITEM 3.    DEFAULTS UPON SENIOR SECURITIES.  None

ITEM 4.    SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.  None

ITEM 5.    OTHER INFORMATION.  None

ITEM 6.    EXHIBITS AND REPORTS ON FORM 8-K.

   (a)     The following exhibit is referenced.

              Exhibit
              Number                Description
              -------               -----------
              27.1                  Financial Data Schedule.

   (b)     Reports on Form 8-K. None


                                       21
<PAGE>   24

                                   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.

                                    IDEC Pharmaceuticals Corporation


Date: November 15, 1999             By:   /s/ William H. Rastetter
      -------------------------          ------------------------------------
                                          William H. Rastetter
                                          Chairman of the Board, President
                                          and Chief Executive Officer
                                          (Principal Executive Officer)

Date: November 15, 1999             By:   /s/ Phillip M. Schneider
      -------------------------          ------------------------------------
                                          Phillip M. Schneider
                                          Vice President and
                                          Chief Financial Officer
                                          (Principal Financial and
                                          Accounting Officer)



                                       22

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED CONSOLIDATED BALANCE SHEETS AND CONDENSED CONSOLIDATED STATEMENTS OF
OPERATIONS CONTAINED IN THE COMPANY'S QUARTERLY REPORT ON FORM 10-Q FOR THE
QUARTER ENDED SEPTEMBER 30, 1999 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE
TO SUCH FINANCIAL STATEMENTS AND THE NOTES THERETO.
</LEGEND>

<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               SEP-30-1999
<CASH>                                          78,334
<SECURITIES>                                   151,658
<RECEIVABLES>                                    1,381
<ALLOWANCES>                                       355
<INVENTORY>                                      8,951
<CURRENT-ASSETS>                               266,624
<PP&E>                                          40,117
<DEPRECIATION>                                  19,772
<TOTAL-ASSETS>                                 294,564
<CURRENT-LIABILITIES>                           18,175
<BONDS>                                              0
                                0
                                          0
<COMMON>                                            21
<OTHER-SE>                                     151,773
<TOTAL-LIABILITY-AND-EQUITY>                   294,564
<SALES>                                              0
<TOTAL-REVENUES>                                85,995
<CGS>                                                0
<TOTAL-COSTS>                                   37,827
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               4,348
<INCOME-PRETAX>                                 37,237
<INCOME-TAX>                                     1,791
<INCOME-CONTINUING>                                  0
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<NET-INCOME>                                    35,446
<EPS-BASIC>                                     1.73
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