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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON D.C. 20549

FORM 10-Q

FOR THE PERIOD ENDED March 31, 2004

OR

FOR THE TRANSITION PERIOD FROM                      TO                      .

COMMISSION FILE NUMBER: 0-31265

TELIK, INC.

(EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

3165 PORTER DRIVE, PALO ALTO, CA 94304

(ADDRESS, INCLUDING ZIP CODE, OF PRINCIPAL EXECUTIVE OFFICES)

REGISTRANT’S TELEPHONE NUMBER, INCLUDING AREA CODE: (650) 845-7700

SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT: NONE

SECURITIES REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT:

COMMON STOCK $0.01 PAR VALUE

(TITLE OF CLASS)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the Exchange Act).    Yes  x    No  ¨

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

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TELIK, INC.

INDEX

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PART I. FINANCIAL INFORMATION

Item 1. Financial Statements (Unaudited)

TELIK, INC.

CONDENSED BALANCE SHEETS

(In thousands, except share and per share data)

See accompanying Notes to Condensed Financial Statements.

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TELIK, INC.

CONDENSED STATEMENTS OF OPERATIONS

(In thousands, except per share amounts)

(Unaudited)

See accompanying Notes to Condensed Financial Statements.

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TELIK, INC.

CONDENSED STATEMENTS OF CASH FLOWS

(In thousands)

(Unaudited)

See accompanying Notes to Condensed Financial Statements.

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TELIK, INC.

Notes to Condensed Financial Statements

(Unaudited)

1. Basis of presentation and summary of significant accounting policies

We have prepared the accompanying financial statements in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. We believe all adjustments (consisting only of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three months ended March 31, 2004 are not necessarily indicative of the results that may be expected for the year ending December 31, 2004 or any other period. The balance sheet at December 31, 2003 has been derived from the audited financial statements at that date. You should read these financial statements and notes in conjunction with our audited financial statements for the year ended December 31, 2003, which are included in our Annual Report on Form 10-K filed with the Securities and Exchange Commission on March 5, 2004.

Use of estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results may differ from those estimates.

Revenue recognition

Contract revenue consists of revenue from research and development collaboration agreements. Our research and development collaboration agreements provide for periodic payments in support of our research activities. We recognize contract revenue from these agreements as earned based upon the performance requirements of the agreements and we recognize payments of up-front technology access and license fees ratably over the period of the related research program. Payments received, which are related to future performance, are deferred and recognized as revenue when earned over future performance periods.

Stock-based compensation

We issue stock options to our employees and outside directors and provide employees the right to purchase our stock pursuant to stockholder approved stock option and employee stock purchase programs. We account for our stock-based compensation plans under the intrinsic value method of accounting as defined by Accounting Principles Board Opinion No. 25, “Accounting for Stock Issued to Employees,” and related interpretations. For pro forma disclosures, the estimated fair value of the options is amortized over the vesting period, typically four years, and the estimated fair value of the stock purchases is amortized over the six-month purchase period. The following table illustrates the effect on net loss and net loss per common share if we had accounted for our stock option and stock purchase plans under the fair value method of accounting under Statement of Financial Accounting Standards, or SFAS, No. 123, “Accounting for Stock Based Compensation,” as amended by SFAS No. 148 (in thousands):

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Stock compensation expense for options granted to non-employees has been determined in accordance with SFAS 123 and EITF 96-18, “Accounting for Equity Investments that are issued to other than Employees for Acquiring, or in Conjunction with Selling Goods or Services,” as the fair value of the consideration received or the fair value of the equity instruments issued, whichever is more reliably measured. The fair value of options granted to non-employees is periodically re-measured as the underlying options vest.

We estimate the fair value of our options using the Black-Scholes option value model, which is one of several methods that can be used to estimate option values. The Black-Scholes option valuation model was developed for use in estimating the fair value of traded options that have no vesting restrictions and are fully transferable. Option valuation models require the input of highly subjective assumptions, including the expected stock price volatility. Our options have characteristics significantly different from those of traded options, and changes in the subjective input assumptions can materially affect the fair value estimates. The fair value of options granted and employee purchase plan shares were estimated at the date of grant using a Black-Scholes pricing model with the following weighted-average assumptions:

2. Comprehensive loss

Comprehensive loss is comprised of net loss and other comprehensive income (loss). Other comprehensive income (loss) includes changes in unrealized gains (losses) on investments. Comprehensive loss for the three months ended March 31, 2004 and 2003 are as follows (in thousands):

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3. Basic and diluted net loss per share

We have computed net loss per common share according to SFAS No. 128, “Earnings Per Share,” which requires disclosure of basic and diluted earnings per share. Basic earnings per share exclude any dilutive effects of options, shares subject to repurchase, warrants and convertible securities. Diluted earnings per share include the impact of potentially dilutive securities.

Outstanding options to purchase an aggregate of 6,355,878 and 4,814,981 shares of our common stock for the three months ending March 31, 2004 and 2003 were excluded from diluted net loss per common share calculations because inclusion of such options would have an anti-dilutive effect on losses in these periods.

4. Cash, cash equivalents, investments and restricted investments

The following is a summary of cash equivalents, investments and restricted investments (in thousands):

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The net realized gains on sales of available for sale investments were not material for any periods presented. Realized gains and losses were calculated based on the specific identification method. At March 31, 2004 and December 31, 2003, the weighted-average maturities of our available-for-sale securities were 85 days and 78 days, respectively.

5. Property and equipment

Property and equipment consist of the following (in thousands):

6. Capital leases and equipment loan

In August 2002, we entered into a Master Lease Agreement, as amended, relating to an equipment lease facility and a related Master Security Agreement, as amended, relating to a line of credit secured by equipment and tenant improvements. Collectively, these credit facilities provide for a line of credit of up to approximately $2.5 million. Both credit facilities have a drawdown period of one year. Draws on the Master Lease Agreement have a payment term of 42 months with an early buyout option at 36 months. Draws on the Master Security Agreement have a payment term of 36 months. Draws under both agreements will bear interest at a rate to be fixed at the time of drawdown, calculated as 675 basis points above the current four-year Treasury Constant Maturities rate. In March 2003, we drew down $1.3 million under the Master Security Agreement and in May 2003, we drew down $839,000 under the Master Lease Agreement. At March 31, 2004, draws under both credit facilities totaled approximately $2.5 million, bearing interest rates between 4.3% and 11.5%. Pursuant to the terms of these credit facilities, we are required to maintain a balance of cash and investments of at least $20.5 million. In the event our cash and investments balance falls below $20.5 million, we are obligated to provide the lessor with a continuing irrevocable letter of credit from a financial institution acceptable to the lessor in an amount equal to 100% of the outstanding balance of all indebtedness and loans.

In August 2003, we entered into a Loan and Security Agreement relating to an equipment facility secured by equipment purchased. The Loan and Security Agreement provides for a line of credit of up to $1.5 million and has a drawdown period of one year. Draws on the Loan and Security Agreement have a payment term of 36 months and will bear interest at a rate fixed at the time of each advance at a per annum rate of 375 basis points above the current 36 month Treasury Constant Maturity rate provided that at no time shall such interest rate be less than 5.09% per annum. At March 31, 2004, draws under this credit facility totaled approximately $684,000, bearing an interest rates between 5.91% and 5.94%. Pursuant to the terms of the credit facility, we are required to maintain a balance of cash and investments with the lender of at least $5.0 million.

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As of March 31, 2004, future payments under capital leases and loans are as follows (in thousands):

7. Registration statement on Form S-3

In April 2004, we filed a registration statement on Form S-3 to offer and sell, from time to time, shares of our common stock in one or more offerings up to a total dollar amount of $200 million.

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ITEM 2.

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND

RESULTS OF OPERATIONS

Special Note Regarding Statements of Expected Future Performance

This Quarterly Report on Form 10-Q contains statements indicating expectations about future performance and other forward-looking statements that involve risks and uncertainties. We usually use words such as “may,” “will,” “should,” “expect,” “plan,” “anticipate,” “believe,” “estimate,” “predict,” “future,” “intend,” “potential,” or “continue” or the negative of these terms or similar expressions to identify forward-looking statements. These statements appear throughout this Quarterly Report on Form 10-Q and are statements regarding our current intent, belief or expectation, primarily with respect to our operations and related industry developments. Examples of these statements include, but are not limited to, statements regarding the following: the implications of positive interim results of our Phase 2 clinical trials, the progress of our research programs, including clinical testing, the extent to which our issued and pending patents may protect our products and technology, our ability to identify new product candidates using TRAP technology (our proprietary Target-Related Affinity Profiling technology), the potential of such product candidates to lead to the development of safer or more effective therapies, our ability to develop the technology derived from our collaborations, our anticipated timing for filing additional Investigational New Drug applications or INDs, with the Food and Drug Administration or FDA, or for the initiation or completion of Phase 1, Phase 2 or Phase 3 testing for any of our product candidates, our future operating expenses, our future losses, our future expenditures for research and development and the sufficiency of our cash resources. You should not place undue reliance on these forward-looking statements, which apply only as of the date of this Quarterly Report on Form 10-Q. Our actual results could differ materially from those anticipated in these forward-looking statements for many reasons, including the risks faced by us and described in the section of this Item 2 titled “Additional Factors That May Affect Future Results” and elsewhere in this Quarterly Report on Form 10-Q.

The following discussion and analysis should be read in conjunction with the unaudited financial statements and notes thereto included in Part I, Item 1 of this Quarterly Report on Form 10-Q and with the financial statements and notes thereto and Management’s Discussion and Analysis of Financial Condition and Results of Operations contained in our Annual Report on Form 10-K for the year ended December 31, 2003 filed with the Securities and Exchange Commission on March 5, 2004.

“Telik,” the Telik logo, TRAP, TELCYTA and TELINTRA are trademarks of Telik, Inc. All other brand names or trademarks appearing in this Quarterly Report on Form 10-Q are the property of their respective holders.

Overview

Telik is engaged in the discovery, development and commercialization of small molecule therapeutics. We have incurred net losses since inception and expect to incur substantial and increasing losses for the next several years as we expand our research and development activities and move our product candidates into later stages of development. As of March 31, 2004, we had an accumulated deficit of $183.2 million.

Our expenses have consisted primarily of those incurred for research and development and general and administrative costs associated with our operations. The process of carrying out the development of our product candidates to later stages of development and our research programs may require significant additional research and development expenditures, including preclinical testing and clinical trials, as well as for manufacturing development efforts and obtaining regulatory approval. We outsource our clinical trials and our manufacturing development activities to third parties to maximize efficiency and minimize our internal overhead. To date, we have funded our operations primarily through the sale of equity securities and non-equity payments from collaborative partners.

We are subject to risks common to biopharmaceutical companies, including risks inherent in our research, development and commercialization efforts, preclinical testing, clinical trials, uncertainty of regulatory and marketing approvals, enforcement of patent and proprietary rights, the need for future

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capital, potential competition, use of hazardous materials and retention of key employees. In order for a product to be commercialized, it will be necessary for us to conduct preclinical tests and clinical trials, demonstrate efficacy and safety of our product candidates to the satisfaction of regulatory authorities, obtain marketing approval, enter into manufacturing, distribution and marketing arrangements, obtain market acceptance and, in many cases, obtain adequate reimbursement from government and private insurers. We have not obtained regulatory approval for the commercial sale of any products and we have not received any revenues from the commercial sale of products. We cannot provide assurance that we will generate revenues or achieve and sustain profitability in the future.

We expect that our quarterly and annual results of operations will fluctuate for the foreseeable future due to several factors, including the timing and extent of our research and development efforts and the outcome of our clinical trial activities. Our limited operating history makes accurate prediction of future operating results difficult or impossible.

During the first quarter of 2004 we announced the following:

Critical accounting policies and significant judgments and estimates

Our management’s discussion and analysis of our financial condition and results of operations are based on our financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information. The preparation of these financial statements requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements as well as the reported revenues and expenses during the reporting periods. On an ongoing basis, we evaluate our estimates and judgments related to revenue recognition and clinical development costs. We base our estimates on historical experience and on various other factors that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.

We believe the following accounting policies are critical to the process of making significant judgments and estimates in the preparation of our financial statements.

Revenue recognition

Since our inception, most of our revenues have been generated from license and research agreements with collaborators. We recognize cost reimbursement revenue under these collaborative agreements as the related research and development costs are incurred. We recognize milestone fees upon completion of specified milestones according to contract terms. Deferred revenue represents the portion of research payments received that has not been earned.

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We also have several royalty and licensing agreements with other pharmaceutical, biotechnology and genomics companies. Under these agreements, we may receive fees for collaborative research efforts, royalties on future sales of products, or some combination of these items. We recognize nonrefundable signing or license fees that are not dependent on future performance under these agreements as revenue when received or over the term of the arrangement if we have continuing performance obligations.

Research and development expenses

Our research and development expenses include salaries and benefits costs, fees for contractors, consultants and third party contract research organizations, and an allocation of facility and administrative costs. Research and development expenses consist of costs incurred for drug and product development, manufacturing, clinical activities, discovery research, screening and identification of product candidates, and preclinical studies. All such costs are charged to research and development expenses as incurred.

Clinical development costs are a significant component of research and development expenses. We have a history of contracting with third parties that perform various clinical trial activities on our behalf in the ongoing development of our product candidates. The financial terms of these contracts are subject to negotiation and may vary from contract to contract and may result in uneven payment flows. We accrue and expense costs for clinical trial activities performed by third parties based upon estimates of the percentage of work completed over the life of the individual study in accordance to agreements established with contract research organizations and clinical trial sites. We determine our estimates through discussion with internal clinical personnel and outside service providers as to progress or stage of completion of trials or services and the agreed upon fee to be paid for such services. These estimates may or may not match the actual services performed by the organizations as determined by patient enrollment levels and related activities. We monitor patient enrollment levels and related activities to the extent possible; however, if we underestimated activity levels associated with various studies at a given point in time, we could record significant research and development expenses in future periods.

Deferred stock compensation

In connection with the grant of stock options to employees, we recorded deferred stock compensation totaling $2.6 million and $0.3 million in the years ended December 31, 2000 and 1999. Deferred stock compensation for options granted to employees has been determined as the difference between the deemed fair value of our common stock for financial reporting purposes on the date such options were granted and the applicable exercise prices. Such amount is included as a reduction of stockholders’ equity and is being amortized using straight-line vesting. We recorded amortization of deferred stock compensation of $93,000 for the three months ended March 31, 2004 and $123,000 for the three months ended March 31, 2003. At March 31, 2004, deferred stock compensation was fully amortized.

Use of estimates

In preparing our financial statements to conform with accounting principles generally accepted in the United States, we make estimates and assumptions that affect the amounts reported in our financial statements and accompanying notes. Actual results may differ from these estimates.

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Results of operations

Three Months Ended March 31, 2004 and 2003

Revenues

Revenues in the three months ended March 31, 2004 resulted primarily from our collaborative agreement with Roche, while revenues in the same period in 2003 resulted from our collaborative agreement with Sanwa. The decrease in revenues of $219,000, or 88%, was primarily due to the completion of our remaining collaboration with Sanwa in May 2003.

We expect near-term future revenues to fluctuate primarily depending upon the extent to which we enter into new collaborative research agreements and the amounts of payments relating to such agreements.

Research and development expenses

Research and development expenses for the three months ended March 31, 2004 and 2003 were $13.2 million and $9.7 million. Our research and development activities consist primarily of drug development, clinical supply manufacturing, clinical activities, discovery research, screening and identification of product candidates and preclinical studies. We group these activities into two major categories: “research and preclinical” and “clinical development.” Research and preclinical costs primarily represent our new drug discovery efforts and preclinical work for our selected clinical candidates. Costs associated with clinical development represent the advancement of our existing product candidates through clinical trials.

The costs associated with research and preclinical and clinical development activities approximate the following:

The increase of 36% or $3.5 million in research and development expenses for the three months ended March 31, 2004 compared to the same period in 2003 was principally due to increased costs for the following:

We expect research and development expenditures to increase in the future as a result of increased manufacturing and clinical development costs primarily relating to our TELCYTA and TELINTRA clinical

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development programs. The timing and the amount of these expenditures will depend upon the outcome of our ongoing clinical trials, the costs associated with the Phase 3 clinical trials of TELCYTA, including related expansion of our research and development organization, regulatory requirements, advancement of our preclinical programs and product manufacturing costs.

The following table summarizes our principal product development programs, including the related stages of development for each product in development and the research and development expenses recognized in connection with each product. The information in the column labeled “Estimated Completion of Current Phase” is our current estimate of the timing of completion of product development phases. The actual timing of completion of those phases could differ materially from the estimates provided in the table. For a discussion of the risks and uncertainties associated with the timing of completing a product development phase, see the “All of our product candidates are in research and development. If clinical trials of TELCYTA and TELINTRA are delayed or unsuccessful or if we are unable to complete the preclinical development of our other preclinical product candidates, our business may suffer,” “If we do not obtain regulatory approval to market products in the United States and foreign countries, we or our collaborators will not be permitted to commercialize our product candidates,” “As our product programs advance, we will need to hire additional scientific and management personnel. Our research and development efforts will be seriously jeopardized if we are unable to attract and retain key personnel,” and “If we are unable to contract with third parties to manufacture our product candidates or any products that we may develop in sufficient quantities and at an acceptable cost, clinical development of product candidates could be delayed and we may be unable to meet demand for any products that we may develop and lose potential revenue” sections of our Risk Factors below. For further information on our products refer to our Annual Report on Form 10-K filed with the Securities and Exchange Commission for the year ended December 31, 2003 on March 5, 2004.

The largest component of our total operating expenses is our ongoing investments in research and development and, in particular, the clinical development of our product pipeline. The process of conducting the clinical research necessary to obtain FDA approval is costly and time consuming. Current FDA requirements for a new human drug to be marketed in the United States include:

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In light of the factors mentioned above, we consider the active management and development of our clinical pipeline to be crucial to our long-term success. The actual probability of success for each candidate and clinical program may be impacted by a variety of factors, including, among others, the quality of the candidate, the validity of the target and disease indication, early clinical data, investment in the program, competition, manufacturing capability and commercial viability. Due to these factors, it is difficult to give accurate guidance on the anticipated proportion of our research and development investments or the future cash inflows from these programs.

General and administrative expenses

The increase in general and administrative expenses of 31% or $614,000 in the three months ended March 31, 2004 was due primarily to increased costs for the following:

We expect future general and administrative expenses to increase in support of expanded business activities including costs associated with our marketing efforts to support our commercialization strategy for TELCYTA.

Interest income and interest expense

Interest income of $609,000 and $374,000 for the three months ended March 31, 2004 and 2003 resulted primarily from earnings on investments. The increase of 63% or $235,000 in interest income was due to higher principal balance of our investments as a result of $142.8 million in net proceeds obtained from our follow-on offering in November 2003.

Interest expense was $51,000 and $12,000 for the three months ended March 31, 2004 and 2003. The increase of 325% or $39,000 in interest expense was due to our utilization of the capital lease and equipment loan facilities.

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Liquidity and capital resources

Sources and Uses of Cash. Since inception we have funded our research and development operations through sales of equity, collaborative arrangements with corporate partners, interest earned on investments and equipment lease financings. At March 31, 2004, we had available cash, cash equivalents, investments and restricted investments of $186.5 million. Our cash and investment balances are held in a variety of interest-bearing instruments including obligations of U.S. government agencies, high-grade corporate and municipal bonds, commercial paper and money market accounts. Cash in excess of immediate requirements is invested with regard to liquidity and capital preservation. Wherever possible, we seek to minimize the potential effects of concentration and degrees of risk.

Cash Flows from Operating Activities. Cash used in operations for the three months ended March 31, 2004 was $15.2 million compared with $11.3 million for the same period in 2003. Net loss of $15.3 million in 2004 included non-cash charges of $337,000 for depreciation and amortization, $93,000 for the amortization of deferred stock compensation and $73,000 related to non-cash stock based compensation to non employees. Cash usage in 2004 resulted from a change in accounts payable of $110,000, prepaids and other assets of $170,000 and accrued clinical trial, compensation and other liabilities of $272,000, which were primarily for operating activities and drug supplies. Cash outflows were offset by changes in accounts payable of $30,000 and an increase of $125,000 in deferred revenue. Operating cash outflows for the same period in 2003 resulted primarily from our net loss of $11.1 million and $2.5 million usage in accounts payable offset by increases of $1.7 million in other receivables and the effect of $550,000 in accrued clinical trial, compensation and other liabilities.

Cash Flows from Investing Activities. Cash provided from investing activities for the three months ended March 31, 2004 was $21.1 million compared with $6.8 million cash used for the same period in 2003. Investing activities in 2004 were primarily related to the $21.3 million in net purchases, sales and maturities of investments and $259,000 equipment purchases. Cash used in the same period in 2003 was related to $4.9 million in net purchases of investments, $1.5 million in restricted cash for a security deposit on our Palo Alto facility and $3.4 million in leasehold improvements and laboratory equipment purchases.

Cash Flows from Financing Activities. Cash provided by financing activities for the three months ended March 31, 2004 was approximately $830,000 compared with a $2.8 million for the same period in 2003. Financing activities in 2004 included approximately $316,000 in proceeds obtained through equipment loans and $750,000 in proceeds from stock option exercises and our employee stock purchase plan, offset in part by $236,000 in payments under capital leases and equipment loan. Financing activities for the same period in 2003 were primarily due to $1.3 million in proceeds obtained through an equipment loan, $1.5 million from stock option exercises and our employee stock purchase plan offset by $32,000 from payments under capital leases and equipment loans.

Working Capital. Working capital decreased to $158.9 million at March 31, 2004 from $172.6 million at December 31, 2003. The decrease in working capital was due to our use of cash in operations primarily due to the expansion of our TELCYTA development program and costs associated with headcount growth.

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In January 2004, we drew down a total of $316,000 for equipment purchases from our existing equipment loan facility at an interest rate of 5.94% payable over 36 months. At March 31, 2004, draws under this credit facility totaled approximately $684,000 and approximately $816,000 remains available for future draws through July 2004.

We believe our existing cash resources will be sufficient to satisfy our anticipated cash requirements through 2005. We expect the increase in clinical development expenses as a result of Phase 3 clinical trials to consume a large portion of our existing cash resources. Changes in our research and development plans or other changes affecting our operating expenses may affect actual future consumption of existing cash resources as well. In any event, we will need to raise substantial additional capital to fund our operations in the future. We expect to finance our future cash needs through the sale of equity securities, strategic collaborations and possibly debt financing or through other sources that may be dilutive to existing stockholders.

In addition, in the event that additional funds are obtained through arrangements with collaborative partners or other sources, such arrangements may require us to relinquish rights to some of our technologies, product candidates or products under development that we would otherwise seek to develop or commercialize ourselves. Our future capital uses and requirements depend on numerous factors, including the following:

We currently have no commitments for any additional financings. If we need to raise additional money to fund our operations, funding may not be available to us on acceptable terms, or at all. If we are unable to raise additional funds when needed, we may not be able to market our products as planned or continue development of our products, or we could be required to delay, scale back or eliminate some or all of our research and development programs. We may seek to raise any necessary additional funds through equity or debt financings, collaborative arrangements with corporate partners or other sources. To the extent that we raise additional capital through licensing arrangements or arrangements with collaborative partners, we may be required to relinquish, on terms that are not favorable to us, rights to some of our technologies or product candidates that we would otherwise seek to develop or commercialize ourselves.

Our future contractual obligations at March 31, 2004 are as follows (in thousands):

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ADDITIONAL FACTORS THAT MAY AFFECT FUTURE RESULTS

You should carefully consider these risk factors as each of these risks could adversely affect our business, operating results and financial condition.

We have a history of net losses, which we expect to continue for at least several years. We will never be profitable unless we develop, and obtain regulatory approval and market acceptance of, our product candidates.

Due to the significant research and development expenditures required to develop our TRAP technology and identify new product candidates, and the lack of any products to generate revenue, we have not been profitable and have incurred operating losses since we were incorporated in 1988. As of March 31, 2004, we had an accumulated deficit of $183.2 million. We expect to incur losses for at least the next several years and expect that these losses will increase as we expand our research and development activities and incur significant clinical testing costs. We do not anticipate that we will generate product revenue for several years. Our losses, among other things, have caused and will cause our stockholders’ equity and working capital to decrease. To date, we have derived substantially all of our revenues, which have not been significant, from project initiation fees and research reimbursement paid pursuant to existing collaborative agreements with third parties and achievement of milestones under current collaborations. We expect that this trend will continue until we develop, and obtain regulatory approval and market acceptance of, our product candidates, if at all. We may never generate product revenue sufficient to become profitable.

All of our product candidates are in research and development. If clinical trials of TELCYTA or TELINTRA are delayed or unsuccessful or if we are unable to complete the preclinical development of our other preclinical product candidates, our business may suffer.

Preclinical testing and clinical trials are long, expensive and uncertain processes. It may take us or our collaborators several years to complete this testing, and failure can occur at any stage of the process. Success in preclinical testing and early clinical trials does not ensure that later clinical trials will be successful, and interim results of trials do not necessarily predict final results. A number of companies in the pharmaceutical industry, including biotechnology companies, have suffered significant setbacks in advanced clinical trials, even after promising results in earlier trials.

TELCYTA has to date been evaluated in Phase 1 and Phase 2 clinical trials. We initiated a Phase 3 registration trial of TELCYTA in ovarian cancer in the first quarter of 2003 and a Phase 3 registration trial of TELCYTA in non small cell lung cancer in March 2004. These trials would test TELCYTA against a control arm consisting of currently established standard drug treatments for these cancers. Changes in standards of care during our Phase 3 trials may cause us to, or the FDA may require us to, perform additional clinical testing of TELCYTA against a different control arm prior to filing a New Drug Application for marketing approval.

We are currently in a Phase 1-2 clinical trial of TELINTRA in MDS, a form of pre-leukemia, to evaluate safety, pharmacokinetics, pharmacodynamics and efficacy. Our success depends, in part, on our ability to complete clinical development of TELINTRA or other preclinical product candidates and take them through early clinical trials.

Any clinical trial may fail to produce results satisfactory to the FDA. Preclinical and clinical data can be interpreted in different ways, which could delay, limit or prevent regulatory approval. Negative or inconclusive results or adverse medical events during a clinical trial could cause a clinical trial to be repeated or a program to be terminated. We typically rely on third-party clinical investigators to conduct our clinical trials and, as a result, we may face additional delays outside our control. We have engaged contract research organizations, or CROs, to facilitate the administration of our Phase 3 trials of

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TELCYTA. Dependence on a CRO will subject us to a number of risks. Delays in identifying and engaging a CRO may result in delays in the initiation of other clinical trials. We may not be able to control the amount and timing of resources the CRO may devote to our trials. Should the CRO fail to administer our Phase 3 trials properly, regulatory approval, development and commercialization of TELCYTA will be delayed.

We do not know whether we will begin planned clinical trials on time or whether we will complete any of our ongoing clinical trials on schedule, if at all. We do not know whether any clinical trials will result in marketable products. Typically, there is a high rate of attrition for product candidates in preclinical and clinical trials. We do not anticipate that any of our product candidates will reach the market for at least several years.

Significant delays in clinical testing could materially impact our product development costs. We do not know whether planned clinical trials will begin on time, will need to be revamped or will be completed on schedule, if at all. In addition to the reasons stated above, clinical trials can be delayed for a variety of reasons, including delays in obtaining regulatory approval to commence a study, delays in reaching agreement on acceptable clinical study agreement terms with prospective clinical sites, delays in obtaining institutional review board approval to conduct a study at a prospective clinical site and delays in recruiting subjects to participate in a study.

While we have not yet experienced delays that have materially impacted our clinical trials or product development costs, delays of this sort could occur for the reasons identified above or other reasons. If we have delays in testing or approvals, our product development costs will increase. For example, we may need to make additional payments to third-party investigators and organizations to retain their services or we may need to pay recruitment incentives. If the delays are significant, our financial results and the commercial prospects for our product candidates will be harmed, and our ability to become profitable will be delayed.

We believe that our ability to compete depends, in part, on our ability to use our proprietary TRAP technology to discover new pharmaceutical products.

TRAP, our proprietary drug discovery technology, is a relatively new drug discovery method that uses a protein panel of approximately 20 proteins selected for their distinct patterns of interacting with small molecules. This panel may lack essential types of interactions that we have not yet identified, which may result in our inability to identify active compounds that have the potential for us to develop into commercially viable drugs.

If we are unable to raise adequate funds in the future, we will not be able to continue to fund our operations, research programs, preclinical testing and clinical trials to develop our product candidates.

The process of carrying out the development of our own unpartnered product candidates to later stages of development and developing other research programs to the stage that they may be partnered will require significant additional expenditures, including the expenses associated with preclinical testing, clinical trials and obtaining regulatory approval. We believe that our existing cash and investment securities will be sufficient to support our current operating plan through 2005. We will require additional financing to fund our operations. We do not know whether additional financing will be available when needed or that, if available, we will obtain financing on terms favorable to our stockholders. As of March 31, 2004, our accumulated deficit was $183.2 million, and we expect capital outlays and operating expenditures to increase over the next several years as we expand our clinical, research and development activities. The extent of any actual increase in operating or capital spending will depend in part on the clinical success of our product candidates.

Raising additional capital by issuing securities or through collaboration and licensing arrangements may cause dilution to existing stockholders or require us to relinquish rights to our technologies or product candidates.

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We may seek to raise any necessary additional funds through equity or debt financings, collaborative arrangements with corporate partners or other sources. To the extent that we raise additional capital by issuing equity securities, our stockholders may experience dilution. To the extent that we raise additional capital through licensing arrangements or arrangements with collaborative partners, we may be required to relinquish, on terms that are not favorable to us, rights to some of our technologies or product candidates that we would otherwise seek to develop or commercialize ourselves.

If our competitors develop and market products that are more effective than our product candidates or any products that we may develop, or obtain marketing approval before we do, our commercial opportunity will be reduced or eliminated.

The biotechnology and pharmaceutical industries are intensely competitive and subject to rapid and significant technological change. Some of the drugs that we are attempting to develop, such as TELINTRA, will have to compete with existing therapies. In addition, a large number of companies are pursuing the development of pharmaceuticals that target the same diseases and conditions that we are targeting. We face competition from pharmaceutical and biotechnology companies in the United States and abroad. Our competitors may develop new screening technologies and may utilize discovery techniques or partner with collaborators in order to develop products more rapidly or successfully than we or our collaborators are able to do.

Many of our competitors, particularly large pharmaceutical companies, have substantially greater financial, technical and human resources than we do. These organizations also compete with us to attract qualified personnel and parties for acquisitions, joint ventures, licensing arrangements or other collaborations. In addition, academic institutions, government agencies and other public and private organizations conducting research may seek patent protection with respect to potentially competing products or technologies and may establish exclusive collaborative or licensing relationships with our competitors.

Our competitors may succeed in developing technologies and drugs that are more effective, better tolerated or less costly than any which are being developed by us or which would render our technology and potential drugs obsolete and noncompetitive. In addition, our competitors may succeed in obtaining FDA or other regulatory approvals for product candidates more rapidly than us or our collaborators. Any drugs resulting from our research and development efforts, or from our joint efforts with our existing or future collaborative partners, may not be able to compete successfully with our competitors’ existing products or products under development or may not obtain regulatory approval in the United States or elsewhere.

If we do not obtain regulatory approval to market products in the United States and foreign countries, we or our collaborators will not be permitted to commercialize our product candidates.

Even if we are able to achieve success in our preclinical testing, we, or our collaborators, must provide the FDA and foreign regulatory authorities with clinical data that demonstrate the safety and efficacy of our product candidates in humans before they can be approved for commercial sale. Failure to obtain regulatory approval will prevent commercialization of our product candidates.

The pharmaceutical industry is subject to stringent regulation by a wide range of authorities. We cannot predict whether regulatory clearance will be obtained for any product candidate that we are developing or hope to develop. A pharmaceutical product cannot be marketed in the United States until it has completed rigorous preclinical testing and clinical trials and an extensive regulatory clearance process implemented by the FDA. Satisfaction of regulatory requirements typically takes many years and depends on the type, complexity and novelty of the product and requires the expenditure of substantial resources. Of particular significance are the requirements covering research and development, testing, manufacturing, quality control, labeling and promotion of drugs for human use.

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Before commencing clinical trials in humans, we, or our collaborators, must submit and receive approval from the FDA of an IND application. We must comply with FDA “Good Laboratory Practices” regulations in our preclinical studies. Clinical trials are subject to oversight by institutional review boards of participating clinical sites and the FDA and:

Before receiving FDA clearance to market a product, we or our collaborators must demonstrate that the product candidate is safe and effective in the patient population that will be treated. Negative or inconclusive results or adverse medical events during a clinical trial could cause a clinical trial to be repeated, a program to be terminated and could delay approval. We typically rely on third-party clinical investigators to conduct our clinical trials and other third party organizations to perform data collection and analysis and, as a result, we may face additional delaying factors outside our control. In addition, we may encounter delays or rejections based upon additional government regulation from future legislation or administrative action or changes in FDA policy or interpretation during the period of product development, clinical trials and FDA regulatory review. Failure to comply with applicable FDA or other applicable regulatory requirements may result in criminal prosecution, civil penalties, recall or seizure of products, total or partial suspension of production or injunction, as well as other regulatory action. We have limited experience in conducting and managing the clinical trials necessary to obtain regulatory approval.

If regulatory clearance of a product is granted, this clearance will be limited to those disease states and conditions for which the product is demonstrated through clinical trials to be safe and efficacious, which could limit our market opportunity. Furthermore, product approvals, once granted, may be withdrawn if problems occur after initial marketing. We cannot ensure that any compound developed by us, alone or with others, will prove to be safe and efficacious in clinical trials and will meet all of the applicable regulatory requirements needed to receive marketing clearance.

Outside the United States, the ability to market a product depends on receiving a marketing authorization from the appropriate regulatory authorities. This foreign regulatory approval process typically includes all of the risks associated with FDA clearance described above and may include additional risks.

As our product programs advance, we will need to hire additional scientific and management personnel. Our research and development efforts will be seriously jeopardized if we are unable to attract and retain key personnel.

Our success depends in part on the continued contributions of our principal management and scientific personnel and on our ability to develop and maintain important relationships with leading academic institutions, scientists and companies in the face of intense competition for such personnel. As we plan for and commence additional advanced clinical trials, including Phase 2 and Phase 3, we will also need to expand our clinical development personnel. In addition, our research programs depend on our ability to attract and retain highly skilled chemists and other scientists. None of our key employees have indicated to Telik that they have plans to retire or leave Telik in the near future. If we lose the services of Dr. Wick or any of our other key personnel, our research and development efforts could be seriously and adversely affected. We have generally entered into consulting or other agreements with our scientific and clinical collaborators and advisors. We do not carry key person insurance that covers Dr. Wick or any of our other key employees. There is currently a shortage of skilled executives and employees with technical expertise in the biotechnology industry, and this shortage is likely to continue. As a result, competition among numerous companies, academic and other research institutions for skilled personnel and experienced scientists is intense and turnover rates are high. The cost of living in the San Francisco Bay Area is very

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high compared to other parts of the country, which we expect will adversely affect our ability to compete for qualified personnel and will increase costs. Because of this competitive environment, we have encountered and may continue to encounter increasing difficulty in attracting qualified personnel as our operations expand and the demand for these professionals increases, and this difficulty could significantly impede the achievement of our research and development objectives.

If physicians and patients do not accept products that we may develop, our ability to generate product revenue in the future will be adversely affected.

Products that we may develop may not gain market acceptance among physicians, healthcare payors, patients and the medical community. Market acceptance of and demand for any products that we may develop will depend on many factors, including the following:

Physicians may elect not to recommend products that we may develop even if we meet the above criteria. If any product that we may develop fails to achieve market acceptance, we may not be able to successfully market and sell the product, which would limit our ability to generate revenue and adversely affect our operations.

If we or our licensees cannot obtain and defend our respective intellectual property rights, or if our product candidates, technologies or any products that we may develop are found to infringe patents of third parties, we could become involved in lengthy and costly legal proceedings that could adversely affect our business.

Our success will depend in a large part on our own and our licensees’ ability to obtain and defend patents for each party’s respective technologies and the compounds and other products, if any, resulting from the application of these technologies. The patent positions of pharmaceutical and biotechnology companies can be highly uncertain and involve complex legal and factual questions. As a result, the degree of future protection for our proprietary rights is uncertain, and we cannot assure you that:

Accordingly, we cannot predict the breadth of claims allowed in our or other companies’ patents.

For TRAP, we hold patents in the United States and internationally, including a pending foreign application. These patents, and any patent that may issue on the pending application, will expire between 2013 and 2015. For TELCYTA, we hold compound patents in the United States and internationally, including a pending foreign application. These patents, and any patent that may issue on the pending application, will expire in 2013 and 2014. For TELINTRA, we hold compound patents in the United States and internationally, including a pending foreign application. These patents, and any patent that may issue on the pending application, will expire in 2014. We can generally apply for patent term extensions on the patents for TELCYTA and TELINTRA when and if marketing approvals for these compounds are obtained in the relevant countries.

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Our success will also depend, in part, on our ability to operate without infringing the intellectual property rights of others. We cannot assure you that our activities will not infringe patents owned by others. As of the date of this quarterly report on Form 10-Q, we have not received any communications with the owners of related patents alleging that our activities infringe their patents. However, if our product candidates, technologies or any products that we may develop are found to infringe patents issued to third parties, the manufacture, use and sale of any products that we may develop could be enjoined, and we could be required to pay substantial damages. In addition, we may be required to obtain licenses to patents or other proprietary rights of third parties. We cannot assure you that any licenses required under any such patents or proprietary rights would be made available on terms acceptable to us, if at all. Failure to obtain such licenses could negatively affect our business.

Others may have filed and in the future may file patent applications covering small molecules or therapeutic products that are similar to ours. We cannot assure you that our patent applications will have priority over patent applications filed by others. Any legal action against us or our collaborators claiming damages and seeking to enjoin commercial activities relating to the affected products and processes could, in addition to subjecting us to potential liability for damages, require us or our collaborators to obtain a license to continue to manufacture or market the affected products and processes. We cannot predict whether we, or our collaborators, would prevail in any of these actions or that any license required under any of these patents would be made available on commercially acceptable terms, if at all. We believe that there may be significant litigation in the industry regarding patent and other intellectual property rights. If we become involved in litigation, it could consume a substantial portion of our managerial and financial resources, and we may not be successful in any such litigation.

In addition, we could incur substantial costs and use of our key employees’ time and efforts in litigation if we are required to defend against patent suits brought by third parties or if we initiate these suits, and we cannot predict whether we would be able to prevail in any of these suits.

Furthermore, some of our patents and intellectual property rights are owned jointly by us and our collaborators. While there are legal and contractual restraints on the rights of these joint owners, they may use these patents and other intellectual property in ways that may harm our business. We may not be able to prevent this type of use.

We also rely on trade secrets to protect technology, including aspects of our TRAP technology, where we believe patent protection is not appropriate or obtainable. However, trade secrets are difficult to protect. While we require employees, academic collaborators and consultants to enter into confidentiality agreements, we may not be able to adequately protect our trade secrets or other proprietary information in the event of any unauthorized use or disclosure or the lawful development by others of such information. If the identity of specific proteins or other elements of our TRAP technology become known, our competitive advantage in drug discovery could be reduced.

Many of our collaborators and scientific advisors have publication and other rights to certain information and data gained from their collaboration and research with us. Any publication or other use could limit our ability to secure intellectual property rights or impair any competitive advantage that we may possess or realize by maintaining the confidentiality of the information or data.

We will depend on collaborative arrangements to complete the development and commercialization of some of our product candidates. These collaborative arrangements may place the development of our product candidates outside of our control, may require us to relinquish important rights or may otherwise not be on terms favorable to us.

We expect to enter into collaborative arrangements with third parties for clinical trials, development, manufacturing, regulatory approvals or commercialization of some of our product candidates, particularly outside North America, or in disease areas requiring larger and longer clinical trials, such as diabetes.

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Dependence on collaborative arrangements will subject us to a number of risks. We may not be able to control the amount and timing of resources our collaborative partners may devote to the product candidates. Our collaborative partners may experience financial difficulties. Should a collaborative partner fail to develop or commercialize a compound or product candidate to which it has rights from us, we may not receive any future milestone payments and will not receive any royalties for this compound or product candidate. Business combinations or significant changes in a collaborative partner’s business strategy may also adversely affect a partner’s willingness or ability to complete its obligations under the arrangement. If we fail to enter into additional collaborative agreements on favorable terms, our business, financial condition and results of operations could be materially adversely affected.

Under our existing collaboration agreements, we are entitled to payments upon future product sales or the achievement of milestones. For example, under our arrangement with Sanwa, we may be entitled to payments of up to $10.0 million. However, we cannot assure you that any product will be successfully developed and commercialized under these collaborations or that we will receive any of these payments.

Some of our collaborations are for early stage programs and allow partners significant discretion in electing whether to pursue any of the planned activities. We do not anticipate significant revenues to result from these relationships until the collaborator has advanced product candidates into clinical trials, which will not occur for several years, if at all. These arrangements are subject to numerous risks, including the right of the collaboration partner to control the timing of the research and development efforts, the advancement of lead product candidates to clinical trials and the commercialization of product candidates. In addition, a collaborative partner could independently move forward with a competing lead candidate developed either independently or in collaboration with others, including our competitors.

If we are unable to contract with third parties to manufacture our product candidates or any products that we may develop in sufficient quantities and at an acceptable cost, clinical development of product candidates could be delayed and we may be unable to meet demand for any products that we may develop and lose potential revenue.

We do not currently operate manufacturing facilities for clinical or commercial production of our product candidates. We expect to continue to rely on third parties for the manufacture of our product candidates and any products that we may develop. We currently lack the resources and capability to manufacture any of our product candidates on a clinical scale or any products that we may develop on a commercial scale. As a result, we will be dependent on corporate partners, licensees or other third parties for the manufacturing of clinical and commercial scale quantities of our product candidates and any products that we may develop. Our product candidates and any products that we may develop may be in competition with other product candidates and products for access to these facilities. For this and other reasons, our collaborators or third parties may not be able to manufacture these product candidates and products in a cost effective or timely manner. While we currently possess sufficient inventory of TELCYTA and TELINTRA that are stored in multiple locations and additional substantial quantity of the active ingredient in TELCYTA, if these inventories are lost or damaged, the clinical development of our product candidates or their submission for regulatory approval could be delayed, and our ability to deliver any products that we may develop on a timely basis could be impaired or precluded.

Since our two affiliated sources for supply of active ingredients in TELCYTA, Organichem Corporation and Albany Molecular Research Inc., merged during 2003, we are currently dependent on a single source supply of the active ingredient and are working to identify additional sources. We presently depend on a single source of supply for clinical quantities of the active ingredient in TELINTRA, Bachem Corporation, and a single source of supply for a key excipient used in the formulation of TELINTRA, Lipoid GmbH. Cardinal Health, Inc. is our sole formulator of TELCYTA and TELINTRA. While these suppliers and formulator currently meet our preclinical and clinical trial requirements, we currently do not have supply agreements with any of these entities, other than with Cardinal Health. While we are presently evaluating potential alternative sources of these materials or formulation services, we currently do not have any such alternative sources that are immediately available. If formulation is not performed in a timely manner, if our suppliers fail to perform or if our relationships with our suppliers or formulator should terminate, our clinical trials and commercialization of TELCYTA and TELINTRA could be delayed. We

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may not be able to enter into any necessary third-party manufacturing arrangements on acceptable terms, if at all. Our current dependence upon others for the manufacture of our product candidates and our anticipated dependence upon others for the manufacture of any products that we may develop may adversely affect our future profit margins and our ability to commercialize any products that we may develop on a timely and competitive basis.

If we are unable to create sales, marketing and distribution capabilities or enter into agreements with third parties to perform these functions, we will not be able to commercialize any products that we may develop.

We currently have no sales, marketing or distribution capabilities. In order to commercialize any products that we may develop, we must internally develop sales, marketing and distribution capabilities or establish collaborations or other arrangements with third parties to perform these services. We intend to market some products that we may develop directly in North America and rely on relationships with one or more pharmaceutical companies with established distribution systems and direct sales forces to market other products that we may develop and address other markets. We may not be able to establish in-house sales and distribution capabilities or relationships with third parties. To the extent that we enter into co-promotion or other licensing arrangements, any product revenues are likely to be lower than if we directly marketed and sold any products that we may develop, and any revenues we receive will depend upon the efforts of third parties, whose efforts may not be successful.

Budget constraints may force us to delay our efforts to develop certain product candidates in favor of developing others, which may prevent us from commercializing all product candidates as quickly as possible.

Because we are an emerging company with limited resources, and because research and development is an expensive process, we must regularly assess the most efficient allocation of our research and development budget. As a result, we may have to prioritize development candidates and may not be able to fully realize the value of some of our product candidates in a timely manner, as they will be delayed in reaching the market, if at all.

If product liability lawsuits are successfully brought against us, we may incur substantial liabilities and may be required to limit commercialization of our product candidates and any products that we may develop.

The testing and marketing of medical products entail an inherent risk of product liability. Although we are not aware of any historical or anticipated product liability claims or specific causes for concern, if we cannot successfully defend ourselves against product liability claims, we may incur substantial liabilities or be required to limit commercialization of our product candidates and any products that we may develop. In addition, product liability claims may also result in withdrawal of clinical trial volunteers, injury to our reputation and decreased demand for any products that we may commercialize. We currently carry product liability insurance that covers our clinical trials up to a $10 million annual aggregate limit. We will need to increase the amount of coverage if and when we have a product that is commercially available. If we are unable to obtain sufficient product liability insurance at an acceptable cost, potential product liability claims could prevent or inhibit the commercialization of any products that we may develop, alone or with corporate collaborators.

If we use biological and hazardous materials in a manner that causes injury, we may be liable for damages.

Our research and development activities involve the controlled use of potentially harmful biological materials, hazardous materials, chemicals and various radioactive compounds, and are subject to federal, state and local laws and regulations governing the use, storage, handling and disposal of these materials and specified waste products. While to our knowledge we have not been in violation of any environmental laws, nor have we been the subject of any investigation for violations of environmental laws in the past, we cannot completely eliminate the risk of accidental contamination or injury from the use, storage, handling

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or disposal of these materials. We currently have $275,000 in insurance coverage, which we believe is a reasonably adequate amount to insulate us from damage claims arising from our use of hazardous materials. However, in the event of contamination or injury, we could be held liable for damages that result, and any liability could exceed our resources.

We have implemented anti-takeover provisions which could discourage or prevent a takeover, even if an acquisition would be beneficial to our stockholders and may prevent attempts by our stockholders to replace or remove our current management.

Provisions of our amended and restated certificate of incorporation and bylaws, as well as provisions of Delaware law, could make it more difficult for a third party to acquire us, even if doing so would be beneficial to our stockholders. In addition, these provisions may frustrate or prevent any attempts by our stockholders to replace or remove our current management by making it more difficult for stockholders to replace members of our board of directors. Because our board of directors is responsible for appointing the members of our management team, these provisions could in turn affect any attempt by our stockholders to replace current members of our management team. These provisions include:

We adopted a stockholder rights plan that may discourage, delay or prevent a merger or acquisition that is beneficial to our stockholders.

In November 2001, our board of directors adopted a stockholder rights plan that may have the effect of discouraging, delaying or preventing a merger or acquisition that is beneficial to our stockholders by diluting the ability of a potential acquiror to acquire us. Pursuant to the terms of our plan, when a person or group, except under certain circumstances, acquires 20% or more of our outstanding common stock or 10 business days after commencement or announcement of a tender or exchange offer for 20% or more of our outstanding common stock, the rights (except those rights held by the person or group who has acquired or announced an offer to acquire 20% or more of our outstanding common stock) would generally become exercisable for shares of our common stock at a discount. Because the potential acquiror’s rights would not become exercisable for our shares of common stock at a discount, the potential acquiror would suffer substantial dilution and may lose its ability to acquire us. In addition, the existence of the plan itself may deter a potential acquiror from acquiring us. As a result, either by operation of the plan or by its potential deterrent effect, mergers and acquisitions of us that our stockholders may consider in their best interests may not occur.

Substantial future sales of our common stock by us or by our existing stockholders could cause our stock price to fall.

Additional equity financings or other share issuances by us, including shares issued in connection with strategic alliances, could adversely affect the market price of our common stock. Sales by existing stockholders of a large number of shares of our common stock in the public market or the perception that additional sales could occur could cause the market price of our common stock to drop. As of March 31, 2004, we had 43,689,172 shares of our common stock outstanding, of which 42,002,761 shares were freely

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tradable and 1,686,411 shares were transferable in accordance with certain volume and manner of sale restrictions under Rule 144. The holder of approximately 1.5 million shares of our common stock is entitled to registration rights. If we propose to register any of our securities under the Securities Act of 1933, as amended, the holder of these shares is entitled to notice of the registration and is entitled to include, at our expense, its shares of common stock in the registration and any related underwriting. However, among other conditions, the underwriters may limit the number of shares to be included in the registration. In addition, the holder of these shares may require us, at our expense, on not more than two occasions and subject to certain limitations, to file a registration statement under the Securities Act with respect to its shares of common stock, and we will be required to use our best efforts to effect the registration.

If we do not progress in our programs as anticipated, our stock price could decrease.

For planning purposes, we estimate the timing of a variety of clinical, regulatory and other milestones, such as when a certain product candidate will enter clinical development, when a clinical trial will be completed or when an application for regulatory approval will be filed. Some of our estimates are included in this quarterly report on Form 10-Q. Our estimates are based on present facts and a variety of assumptions. Many of the underlying assumptions are outside of our control. If milestones are not achieved when we expect them to be, investors could be disappointed, and our stock price may decrease.

Our stock price may be volatile, and you may not be able to resell your shares at or above your purchase price.

Our stock prices and the market prices for securities of biotechnology companies in general have been highly volatile, with recent significant price and volume fluctuations, and may continue to be highly volatile in the future. During 2003, our common stock traded between $23.31 and $10.02 and during the first quarter of 2004, our common stock traded between $28.72 and $22.43. You may not be able to sell your shares quickly or at the market price if trading in our stock is not active or the volume is low. The following factors, in addition to other risk factors described in this section, may have a significant impact on the market price of our common stock, some of which are beyond our control:

Item 3. Quantitative and Qualitative Disclosures About Market Risk.

The following discussion about our market risk exposure involves forward-looking statements. We are exposed to market risk related mainly to changes in interest rates and we believe our exposure to market risk is immaterial. We do not use or hold derivative financial instruments.

Our investment policy is to manage our marketable securities portfolio to preserve principal and liquidity while maximizing the return on the investment portfolio. To minimize the exposure due to adverse shifts in interest rates we maintain investments of shorter maturities. Our marketable securities portfolio is primarily invested in corporate debt securities and commercial papers with an average maturity of under one year and a minimum investment grade rating of A or A-1 or better to minimize credit risk. Although changes in interest rates may affect the fair value of the marketable securities portfolio and cause

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unrealized gains or losses, such gains or losses would not be realized unless the investments were sold prior to maturity. Through our money managers, we maintain risk management control systems to monitor interest rate risk. The risk management control systems use analytical techniques, including sensitivity analysis. We have operated primarily in the United States and all funding activities with our collaborators to date have been made in U.S. dollars. Accordingly, we do not have any exposure to foreign currency rate fluctuations.

The table below presents the principal amounts and weighted-average interest rates by year of maturity for our investment portfolio (dollars in thousands).

Item 4. Controls and Procedures.

Evaluation of disclosure controls and procedures. Based on our management’s evaluation (with the participation of our chief executive officer and chief financial officer), our chief executive officer and chief financial officer have concluded that, subject to limitations described below, our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended), were effective as of March 31, 2004 to ensure that information required to be disclosed by us in this quarterly report on Form 10-Q was recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms.

Changes in internal controls. There were no changes in our internal controls over financial reporting during the quarter ended March 31, 2004 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Limitations on the effectiveness of controls. A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Because of inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues, if any, within a company have been detected. Accordingly, our disclosure controls and procedures are designed to provide reasonable, not absolute, assurance that the objectives of our disclosure control system are met and, as set forth above, our chief executive officer and chief financial officer have concluded, based on their evaluation as of the end of the period covered by this report, that our disclosure controls and procedures were sufficiently effective to provide reasonable assurance that the objectives of our disclosure control system were met.

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PART II. OTHER INFORMATION