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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

(Mark One)

FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2005

OR

FOR THE TRANSITION PERIOD FROM              TO             

Commission File Number 000-22873

NUVELO, INC.

(Exact Name of Registrant as Specified in Its Charter)

675 ALMANOR AVENUE, SUNNYVALE, CA 94085

(Address of Principal Executive Offices, including Zip Code)

408-215-4000

(Registrant’s Telephone Number, including Area Code)

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Sections 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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NUVELO, INC.

FORM 10-Q

FOR THE QUARTER ENDED MARCH 31, 2005

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PART I. FINANCIAL INFORMATION

ITEM 1. CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

NUVELO, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(unaudited)

See accompanying notes to condensed consolidated financial statements.

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NUVELO, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(unaudited)

See accompanying notes to condensed consolidated financial statements.

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NUVELO, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(unaudited)

See accompanying notes to condensed consolidated financial statements.

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NUVELO, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2005

(Unaudited)

1. Basis of Presentation and Significant Accounting Policies

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared by Nuvelo, Inc. (“Nuvelo,” the “Company,” “we,” “us,” or “our”) in accordance with accounting principles generally accepted in the United States of America 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 of America (GAAP) for complete financial statements. The accompanying financial information is unaudited, but includes all adjustments (consisting of normal recurring adjustments) that the Company considers necessary for a fair presentation of the financial position, operating results and cash flows for the periods presented. The condensed consolidated balance sheet as of December 31, 2004 is derived from the Company’s audited financial statements. Certain prior period amounts have been reclassified to conform to the current period’s presentation. The results of operations for the interim period shown herein are not necessarily indicative of operating results expected for the entire year.

The consolidated financial statements include the accounts of Nuvelo, Inc., Hyseq Diagnostics, Inc. and Callida Genomics, Inc. (Callida), through its disposal on December 3, 2004. The results of operations of Callida have been reclassified to discontinued operations for all periods presented. All significant intercompany transactions and accounts have been eliminated on consolidation.

Use of Estimates

Conformity with GAAP requires the use of estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. The Company bases its estimates on historical experience and on assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for the judgments made about the carrying values of assets and liabilities that are not readily apparent from other sources. Future results may differ from these estimates. The Company believes significant judgment is involved in evaluating if there continues to be alternative future use for clinical drug material, and in estimating goodwill and long-lived asset impairment, clinical trial accruals and stock-based compensation.

Liquidity

To date, the Company’s primary sources of liquidity have been cash from financing activities, collaboration receipts and the merger with Variagenics in January 2003. The Company plans to continue to raise funds through additional public and/or private offerings and collaboration activities in the future. The primary use of capital resources has been to fund operating activities, including research and clinical development expenses, license payments and spending on capital items. In the event that the Company is unable to raise additional funds through financing activities, the Company will have to reduce its operating costs and delay its research and development programs.

Significant Accounting Policies

During interim periods, the Company has followed the accounting policies described in its Form 10-K for the fiscal year ended December 31, 2004. Please refer to the Annual Report to Shareholders for the same period when reviewing this Form 10-Q.

Recent Accounting Pronouncements

On December 16, 2004, the FASB issued Statement of Financial Accounting Standards No. 123 (revised 2004), “Share-Based Payment” (SFAS 123(R)), an amendment of Statements of Financial Accounting Standards No. 123 and 95, that addresses the accounting for share-based awards to employees. The standard requires companies to recognize as an expense the fair value of stock options and other stock-based compensation to employees. The statement eliminates the ability to account for share-based compensation transactions using APB Opinion No. 25, “Accounting for Stock Issued to Employees,” (APB 25), and generally requires instead that companies account for such transactions using a fair value based method, such as the Black-Scholes option pricing model, to fairly value stock options and recognize that value as an expense. The standard will be effective for public companies as of the beginning of the first fiscal year after June 15, 2005. The Company currently accounts for stock-based compensation plans in accordance with APB 25. SFAS 123(R) offers companies alternative methods of adopting this standard. At present, the Company has not yet determined which method to adopt, but regardless of the method, adoption of this statement is expected to have a material adverse effect on the Company’s consolidated financial statements.

2. Stock-Based Compensation

In accordance with the provisions of Statement of Financial Accounting Standards No. 123, “Accounting for Stock-Based Compensation” (SFAS 123), as amended by SFAS No. 148, “Accounting for Stock-Based Compensation — Transition and Disclosure” (SFAS 148) the Company has elected to account for stock-based compensation to employees under the provisions of Accounting Principles Board Opinion No. 25, “Accounting for Stock Issued to Employees,” and its related interpretations, and to adopt the “disclosure only” alternative described in SFAS 123, as amended by SFAS 148. Stock options granted to non-employees are accounted for in accordance with SFAS 123 and Emerging Issues Task Force No. 96-18, “Accounting for Equity Instruments that Are Issued to Other than Employees for Acquiring, or in Conjunction with Selling, Goods or Services.” The Company’s pro forma information for employee stock options is as follows (in thousands, except for per share data):

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3. Comprehensive Loss

The components of comprehensive loss in each period presented are as follows:

4. Financing Arrangements

In August 2004, the Company entered into a Loan and Security Agreement (Loan Agreement), with Silicon Valley Bank that provides a $6.0 million term loan facility and a $4.0 million revolving credit line and grants Silicon Valley Bank a security interest over certain of our assets, excluding intellectual property. As a condition precedent to the Loan Agreement, the Company agreed, among other things, to certain covenants and reporting requirements. In December 2004, the Company completed a planned $2.6 million initial draw-down on the term loan, the proceeds of which were used entirely to repay a note for the same amount that was owed to AMB Property, LP in relation to the termination of a lease agreement for facilities at Humboldt Court, Sunnyvale, California. In March 2005, the Company completed a second draw-down under the term loan, of $1.5 million, with $0.6 million of these proceeds being used to pay off certain capital leases. The $1.5 million draw-down will be repaid in 36 equal monthly installments, plus accrued interest, commencing on April 1, 2005. The Company has not drawn-down any of the funds available under the revolving credit line, which is currently being used to collateralize a $4.0 million letter of credit issued to the Irvine Company related to the lease for the facility at 985 Almanor Avenue in Sunnyvale, California. The proceeds of all other term loan draw-downs and the revolving credit line may be used solely for working capital or other general business requirements. The Company’s term loan borrowings, except for the second draw-down, shall bear interest at a fixed rate per annum equal to the 36-month Treasury Rate in effect on the funding date plus 3.25%, and, in any event, shall not be less than 6.43% per annum, which is the rate applicable to the initial draw-down. The second draw-down was at a rate equal to the 36-month Treasury Rate in effect on the funding date plus 2.75%, being 6.78%. The Company’s revolving credit line borrowings shall bear interest at Silicon Valley Bank’s prime rate in effect from time to time. As of March 31, 2005, the Company had received waivers for any breaches of related covenants and reporting requirements.

5. Facilities Lease Agreement

On January 11, 2005, the Company entered into a seven-year facility lease agreement with BMR-201 Industrial Road LLC for 61,826 square feet of industrial space at 201 Industrial Road in San Carlos, California at $2.35 per square foot per month, subject to annual increases of $0.07 per square foot per month. The lease will commence on or around September 1, 2005 and contains an option to cancel the lease after five years, two options to extend the lease for five additional years at 95% of the then-current fair market rental rate (but not less than the existing rental rate), and rights of first refusal over all vacant space in the building during the first two years of the lease. The lease contains a tenant improvement allowance of $8.7 million, or $140 per square foot.

As a result of the entry into this lease, a review for impairment of leasehold improvements at 985 Almanor Avenue in Sunnyvale, California took place in January 2005. As identifiable cash flows related to these assets are not independent of those of the Company as a whole, these assets were grouped with all the assets and liabilities of the Company for the purposes of the impairment review, and as a result, no impairment of these assets was identified, as the fair value of the net assets of the Company exceeds its carrying value. In accordance with Statement of Financial Accounting Standards No. 144, “Accounting for the Impairment or Disposal of Long-Lived Assets,” if the Company subleases or otherwise exits this facility, an impairment charge will be recorded based on the difference between the carrying value and fair value of the leasehold improvements at the time of the sublease or exit. As of March 31, 2005, this difference was estimated to be $3.8 million.

6. Common Stock Offering

In February 2005, the Company raised $68.5 million in a public offering, net of underwriters’ fees and stock issuance costs of $4.8 million, from the sale of 9,775,000 shares of common stock, including 1,275,000 shares related to the exercise of an over-allotment option granted to the underwriters, at a public offering price of $7.50 per share. The Company intends to use the net proceeds from this offering for general corporate purposes, including capital expenditures, working capital needs, current and future clinical trials of alfimeprase, rNAPc2 and ARC183, as well as other research and drug development activities.

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7. Collaborative and Manufacturing Agreements

On March 31, 2005, the Company entered into a new collaboration agreement with the Pharmaceutical Division of Kirin Brewery Company, Ltd. (Kirin) for the development and commercialization of NU206 (NU206 Agreement). The existing collaboration agreement with Kirin (Original Agreement), which was amended in the third quarter of 2004 to extend the term to December 31, 2005 and expand the scope to include additional secreted protein genes from the Company’s full-length gene portfolio, continues to govern all product candidates other than NU206. Under the NU206 Agreement, the Company will receive a $2.0 million upfront cash payment from Kirin, and will lead worldwide development, manufacturing and commercialization of the compound. All operating expenses and profits related to the development and commercialization of NU206 will be shared in a 60 (Nuvelo) / 40 (Kirin) ratio. If the NU206 Agreement is terminated, or if Kirin or Nuvelo elects under certain circumstances to no longer actively participate in the collaboration, the relationship with respect to NU206 will convert from an expense and profit sharing structure to a royalty based structure. The Company will continue to jointly own discoveries resulting from the Original Agreement and jointly develop and market the resulting products, while sharing costs, efforts and revenues with Kirin.

On January 21, 2005, the Company entered into an Interim Agreement with Avecia Limited for initial work related to the manufacture by Avecia of alfimeprase, the Company’s lead clinical compound. The initial work will include assessment and planning, transfer of processes and assays to Avecia, purchase of certain capital equipment, replicated fermentation and purification runs and consulting work in preparation for the manufacture of alfimeprase pursuant to current Good Manufacturing Practices requirements. The Company will pay Avecia fees totaling £0.7 million (equivalent to $1.3 million as of March 31, 2005) for completion of this initial work, and will also pay for the purchase of necessary items of equipment, together with certain related fees and expenses. The Interim Agreement will expire upon the first to occur of completion of the work under the agreement by Avecia, entry by Nuvelo and Avecia into a definitive agreement, or termination of the agreement by either party. Either party may terminate the agreement at any time, subject to certain cancellation fees, if applicable. The Interim Agreement requires negotiation in good faith towards the potential entry into a definitive agreement with Avecia that would cover activities under the Interim Agreement as well as other activities related to the ongoing manufacture of alfimeprase.

8. Transactions with Related Parties

Dr. Rathmann, the Company’s Chairman, provided a $20.0 million line of credit to the Company in August 2001, of which $11.0 million was drawn down, with the remaining $9.0 million having expired unused. The related promissory note bears interest at the prime rate plus 1%. In November 2003, the Company began repaying the outstanding balance over 48 months with equal monthly principal payments of $0.2 million. Accrued interest will be paid with the final payment in October 2007. The remaining principal and accrued interest to date totaled $8.6 million as of March 31, 2005, and the interest rate on the note was 6.75%. The outstanding principal and interest under the note may be repaid at any time upon mutual agreement, by conversion into shares of the Company’s common stock at a price based upon the average stock price over a 20-day period ending 2 days prior to the conversion or, if in connection with an equity financing, at the offering price. As of March 31, 2005, 1,248,175 shares would be issuable to fully repay the principal and interest outstanding upon conversion. Dr. Rathmann continues to provide a personal guarantee of $1.5 million to the Irvine Company, related to the 985 Almanor Avenue facility lease.

9. Segment Information

The Company is engaged in the discovery, development and commercialization of life improving therapeutics for the treatment of human disease. Reportable segments reflect the Company’s structure, reporting responsibilities to the chief executive officer and the nature of the products under development. The Company has only one reportable segment since the sale of its majority-owned subsidiary Callida Genomics, Inc. in December 2004, and accordingly all segment-related financial information required by Statement of Financial Accounting Standards No. 131, “Disclosures About Segments of an Enterprise and Related Information” is included in the condensed consolidated financial statements.

10. Subsequent Events

As a result of dosing the first patient in the first Phase 3 clinical trial for alfimeprase on April 15, 2005, the Company is required to pay Amgen $5.0 million within 30 days of this date as a milestone payment under the license agreement between the Company and Amgen entered into in November 2004. The amount will be recorded as research and development expense in the second quarter of 2005.

As a result of entering into the NU206 Agreement with Kirin on March 31, 2005 (see Note 7), the Company received a $2.0 million upfront cash payment from Kirin in April 2005, which will be recognized ratably as revenue over the estimated performance period under the contract, commencing in the second quarter of 2005.

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

This Management’s Discussion and Analysis of Financial Condition and Results of Operations contains “forward-looking statements” as that term is defined in the Private Securities Litigation Reform Act of 1995. Forward-looking statements may be identified by words including “will,” “anticipate,” “believe,” “intends,” “estimates,” “expect,” “should,” “may,” “potential” and similar expressions. Such statements are based on our management’s current expectations and involve risks and uncertainties. Actual results and performance could differ materially from those projected in the forward-looking statements as a result of many factors discussed herein and elsewhere including, in particular, those factors described under the “Risk Factors” set forth below, and in our other periodic reports filed from time to time with the Securities and Exchange Commission, or SEC. Actual results and performance could also differ materially from time to time from those projected in our filings with the SEC.

Overview

We are engaged in the discovery, development and commercialization of life improving therapeutics for the treatment of human disease. In April 2005, we began patient enrollment in a Phase 3 trial of our lead product candidate, alfimeprase, for the treatment of acute peripheral arterial occlusion (PAO), or “leg attack.” Alfimeprase, a thrombolytic agent, has completed Phase 2 trials in two indications, acute PAO and catheter occlusion. A Phase 3 program in catheter occlusion is expected to begin in the second half of 2005. Adding to our cardiovascular portfolio, in the first quarter of 2004 we entered into a partnership with Archemix for the development and commercialization of ARC183, a novel thrombin inhibitor, and a license agreement with Dendreon for worldwide rights to rNAPc2, an anticoagulant that inhibits the interaction of factor VIIa and tissue factor. ARC183 is currently in a Phase 1 program evaluating its potential use in coronary artery bypass graft (CABG) surgery, which we expect to conclude in the second quarter of 2005; rNAPc2 is currently in a Phase 2 program evaluating its potential use in treating acute coronary syndromes (ACS). Within this program, we are conducting a Phase 2a trial evaluating the safety and efficacy of rNAPc2 that is expected to conclude in the second quarter of 2005, and an additional Phase 2 trial evaluating heparin replacement is expected to commence in the second half of 2005.

In March 2005, we entered into a new collaboration agreement with the Pharmaceutical Division of Kirin Brewery Company, Ltd. (Kirin), for the development and commercialization of NU206, a potent gastrointestinal growth factor identified as a result of our proprietary research programs. In addition, we plan to leverage our proprietary gene collection and expertise in secreted proteins and antibody discovery to expand our pipeline and create partnering and licensing opportunities.

The alfimeprase Phase 3 acute PAO program will consist of two overlapping trials with an estimated total of approximately 700 patients between the two trials. The first trial in this program, NAPA-2 (Novel Arterial Perfusion with Alfimeprase-2), is a randomized, double-blind study comparing 0.3 mg/kg of alfimeprase versus placebo in 300 patients. The trial will be conducted in over 100 centers worldwide. The study’s primary endpoint is avoidance of open vascular surgery within 30 days of treatment. Open vascular surgery includes procedures such as surgical embolectomy and peripheral arterial bypass graft surgery as well as amputation, but does not include catheter-based procedures such as percutaneous angioplasty or stenting. A variety of secondary endpoints are also being evaluated, including safety endpoints such as the incidence of bleeding, as well as pharmacoeconomic endpoints, such as length of hospital and intensive care unit (ICU) stay. The second Phase 3 trial, NAPA-3, is expected to begin in the second half of 2005.

Alfimeprase is a thrombolytic agent, or blood clot dissolver, with a novel mechanism of action, and was identified through a research program at Amgen Inc. In January 2002 we entered into a 50/50 cost/profit sharing arrangement with Amgen for the development and commercialization of alfimeprase. In October 2004, Amgen exercised its rights pursuant to the terms of this collaboration agreement to terminate its collaboration with us and enter instead into an exclusive license whereby we are granted the worldwide rights to develop and commercialize alfimeprase in exchange for the payment to Amgen of previously negotiated milestone payments and royalties. Under the terms of our license agreement, Amgen will transfer the technology necessary for the manufacture of alfimeprase to us or our designated manufacturer. On January 21, 2005, we entered into an Interim Agreement with Avecia, our designated manufacturer, to manufacture alfimeprase, and we are currently in negotiations with Avecia for a definitive agreement to manufacture commercial quantities of alfimeprase. Amgen is required to continue to supply alfimeprase to us during the transition period. As a result of dosing the first patient in the first Phase 3 clinical trial for alfimeprase on April 15, 2005, we are required to pay Amgen $5.0 million within 30 days of this date. Additional future milestone payments under the license agreement could total as much as $35.0 million, although we currently cannot predict if and when any of these additional milestones will be achieved.

rNAPc2 is a recombinant version of a naturally occurring protein that has anticoagulant properties. We are currently investigating rNAPc2 in a Phase 2a double-blind, placebo-controlled clinical trial for potential use in treating acute coronary syndromes (ACS), including unstable angina (UA), and non-ST segment elevation myocardial infarction (NSTEMI). We plan to complete patient enrollment of this trial in the second quarter of 2005. We also plan to commence an additional Phase 2 trial with rNAPc2, a heparin-replacement study, in the second half of 2005. We have licensed worldwide rights to all indications of rNAPc2 and all other rNAPc molecules owned by Dendreon, as a result of a licensing agreement entered into with Dendreon Corporation in February 2004. Under the terms of the agreement, we paid Dendreon an upfront fee of $4.0 million ($0.5 million in cash and $3.5 million in Nuvelo common stock), and have expensed $5.6 million for this and related development costs in 2004 and $0.6 million for related development costs in the first three months of 2005. We are required to pay Dendreon milestone payments, ranging from $2.0 million to $6.0 million, for both of rNAPc2’s first and second indications upon dosing of the first patient in a Phase 3 clinical trial, upon submission of a New Drug Application (NDA), and upon first commercial sale. If all development and commercialization milestones are achieved, total milestone payments to Dendreon can reach as much as $23.5 million, although we currently cannot predict if and when any of these milestone will be achieved. If rNAPc2 is commercialized, we will also be responsible for paying future royalties to Dendreon depending on certain sales volume of rNAPc2.

We continue to pursue the development and commercialization of ARC183 under a collaboration agreement entered into with Archemix, a privately held biotechnology company located in Cambridge, Massachusetts, in January 2004. In August 2004, we jointly initiated a Phase 1 clinical program for ARC183, a novel thrombin inhibitor, for potential use in coronary artery bypass graft (CABG) surgery. These studies are evaluating the safety, tolerability, anticoagulation activity and titratability of ARC183. We expect to complete enrollment of the Phase 1 clinical program of ARC183 in the second quarter of 2005. Under the terms of the agreement, we paid Archemix an upfront fee of $3.0 million in cash, and equally share all costs associated with its development and commercialization since our initial funding of these costs reached $4.0 million in the third quarter of 2004. We expensed $7.7 million for the upfront fee and related development costs in 2004 and $0.7 million for related development costs in the first three months of 2005. Archemix is initially responsible for leading development and for all clinical development activities through the dosing of the first patient in a Phase 2 study. Thereafter, we and Archemix will agree on leadership of clinical development and commercialization activities. We are required to pay Archemix total development milestone payments of up to $11.0 million, including $10.0 million upon the first dosing of a patient in a Phase 2 trial and $1.0 million upon the designation of any backup compound selected by both Nuvelo and Archemix for IND-enabling studies. We estimate that the milestone payment of $10.0 million could occur in the first half of 2006. If ARC183 is commercialized, both companies are responsible for paying any related royalties to each other depending on product sales volume.

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On March 31, 2005, we entered into a new collaboration agreement with Kirin for the development and commercialization of NU206 (NU206 Agreement). In late 2004, NU206 became the first compound to enter IND-enabling studies from our existing collaboration with Kirin. Research to date indicates that NU206 acts as a specific and potent stimulator of gastrointestinal epithelial cells and therefore could have potential clinical utility in inflammatory bowel disease, short-bowel syndrome and in chemotherapy or radiation therapy induced mucositis. We plan to announce a primary indication in the second quarter of 2005. Our existing collaboration agreement with Kirin (Original Agreement), which was amended in the third quarter of 2004 to extend the term to December 31, 2005 and expand the scope to include additional secreted protein genes from our full-length gene portfolio, continues to govern all product candidates other than NU206. Under the NU206 Agreement, we received a $2.0 million upfront cash payment from Kirin in April 2005, and will lead worldwide development, manufacturing and commercialization of the compound. All operating expenses and profits related to the development and commercialization of NU206 will be shared in a 60 (Nuvelo) / 40 (Kirin) ratio. If the NU206 Agreement is terminated, or Nuvelo or Kirin elects under certain circumstances to no longer actively participate in the collaboration, the relationship with respect to NU206 will convert from an expense and profit sharing structure to a royalty based structure. Under the Original Agreement, we have completed the initial analysis of 50 secreted protein genes in mouse models and will be testing additional candidates genes in 2005. We will continue to jointly own discoveries resulting from the Original Agreement and jointly develop and market the resulting products, while sharing costs, efforts and revenues with Kirin.

In January 2005, we entered into a seven-year facility lease agreement with BMR-201 Industrial Road LLC for 61,826 square feet of industrial space at 201 Industrial Road in San Carlos, California at $2.35 per square foot per month, subject to annual adjustments. The lease will commence on or around September 1, 2005 and contains an option to cancel the lease after five years, two options to extend the lease for five additional years at 95% of the then-current fair market rental rate (but not less than the existing rental rate), and rights of first refusal over all vacant space in the building during the first two years of the lease. The lease contains a tenant improvement allowance of $8.7 million, or $140 per square foot.

In February 2005, we raised $68.5 million in a public offering, net of underwriters’ fees and stock issuance costs of $4.8 million, from the sale of 9,775,000 shares of our common stock, including 1,275,000 shares related to the exercise of an over-allotment option granted to the underwriters, at a public offering price of $7.50 per share. We intend to use the net proceeds from this offering for general corporate purposes, including capital expenditures, working capital needs, current and future clinical trials of alfimeprase, rNAPc2 and ARC183, as well as other research and drug development activities. The amounts and timing of the expenditures will depend on numerous factors, such as the timing and progress of our clinical trials and research and development efforts, technological advances and the competitive environment for our drug candidates. We expect from time to time to evaluate the acquisition of businesses, products and technologies for which a portion of the net proceeds may be used, although we currently are not planning or negotiating any such transactions.

Results of Operations

Nuvelo’s core business is to discover, develop and market therapeutic drugs for the treatment of human diseases. The following results of operations include those of both Nuvelo Inc. and Callida Genomics, Inc. (Callida), through the disposal of this subsidiary on December 3, 2004. The results of Callida have been reclassified to discontinued operations for all periods presented.

Contract Revenue

Contract revenue was $42,000 in the three months ended March 31, 2005, as compared to $78,000 in the corresponding period of 2004. A one-time upfront fee of $2.0 million related to the new NU206 collaboration agreement with Kirin was received in April 2005 and will be recognized ratably as revenue over the estimated performance period under the contract, commencing in the second quarter of 2005.

Our revenues may vary significantly from quarter to quarter as a result of licensing or collaboration activities. In the future, we may not be able to maintain existing collaborations, obtain additional collaboration partners or obtain revenue from other sources, which could have a material adverse effect on our revenues, operating results and cash flows.

Research and Development Expenses

Research and development (R&D) expenses, primarily consist of R&D personnel costs, clinical trial and drug manufacturing costs, license, collaboration and royalty fees, outside services, supplies, depreciation and amortization, and allocated facilities expenses.

R&D expenses were $11.1 million in the three months ended March 31, 2005, as compared to $15.4 million in the corresponding period of 2004. The decrease of $4.3 million was primarily due to $7.0 million in upfront fees expensed in the 2004 period related to license and collaboration agreements for our rNAPc2 and ARC183 clinical development candidates, partially offset by increased expenses associated with the start of the alfimeprase Phase 3 trial in 2005.

R&D expenses included in the statement of operations for the three months ended March 31, 2005 and since inception for our significant programs are as follows (including license and collaboration fees):

We expect to expense up to $11.5 million of drug manufacturing costs within the next twelve months as we advance alfimeprase into Phase 3 clinical trials in 2005. We also are required to pay Amgen a milestone fee of $5.0 million in the second quarter of 2005, as a result of dosing of the first patient in the first phase 3 clinical trial for alfimeprase, which occurred on April 15, 2005. We currently do not expect to incur any other milestone expense for alfimeprase or our rNAPc2 and ARC183 drug candidates in 2005. We expect other R&D expenses to increase during 2005 as we continue to dedicate our resources to advance the Phase 3 clinical trials for alfimeprase, as well as work to enhance our pipeline by seeking attractive therapeutic candidates that complement our ongoing development programs, while prosecuting and enforcing our intellectual property rights.

The timing, cost of completing the clinical development of any product candidate, and any potential future product revenues will depend on a number of factors, including the disease or medical condition to be treated, clinical trial design and endpoints, availability of patients to participate in trials and the relative efficacy of the product versus treatments already approved. Due to these uncertainties, we are unable to estimate the length of time or the costs that will be required to complete the development of these product candidates. We do not expect to generate any product revenue until we reach the commercialization stage for any of our drug products, if this ever occurs.

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General and Administrative Expenses

General and administrative (G&A) expenses primarily consist of G&A personnel costs, consulting and professional fees, insurance, facilities and depreciation expenses, and various other administrative costs.

G&A expenses were $3.8 million in the three months ended March 31, 2005, as compared to $1.7 million in the corresponding period of 2004. The increase of $2.1 million was primarily due to a $0.7 million increase in G&A personnel costs, a $0.6 million increase in consulting and professional fees, largely associated with the internal controls documentation, testing and auditing required under the Sarbanes-Oxley Act of 2002, a $0.3 million increase in non-cash stock compensation expense, and a $0.2 million increase in facilities expenses.

We expect general and administrative expenses to increase during 2005 as compared to 2004 in order to support growth in our general operating activities.

Interest Income and Expense, Net

We had net interest income of $0.2 million in the three months ended March 31, 2005, as compared to $0.2 million net interest expense in the corresponding period of 2004. The change resulted from a $0.4 million decrease in investment-related interest expense between the periods.

Loss from Continuing Operations

Since our inception we have incurred significant net losses, and as of March 31, 2005 our accumulated deficit was $270.7 million. During the three months ended March 31, 2005 we incurred a net loss from continuing operations of $14.7 million, as compared to $17.2 million in the corresponding period of 2004.

We expect to continue to incur significant losses from continuing operations for the foreseeable future, which may increase substantially as we continue development of our clinical stage drug candidates, alfimeprase, a thrombolytic agent, rNAPc2, an anticoagulant, ARC183, a novel thrombin inhibitor, and our preclinical stage drug candidate, NU206, a gastrointestinal growth factor. In addition, we expect to incur significant costs as we further expand research and development of our potential biopharmaceutical product candidates, potentially in-license other drug candidates, and continue to prosecute and enforce our intellectual property rights.

Loss from Discontinued Operations

On December 3, 2004, we sold our subsidiary, Callida Genomics, Inc. (Callida). In accordance with Statement of Financial Accounting Standards No. 144, “Accounting for the Impairment or Disposal of Long-Lived Assets”, the operating results of Callida have been reclassified to discontinued operations for all periods presented. During the three months ended March 31, 2004, we incurred a net loss from discontinued operations of $0.5 million, related to Callida.

Liquidity and Capital Resources

Cash, cash equivalents and short-term investment balances at March 31, 2005 and December 31, 2004 were as follows:

Cash flows from operating, investing and financing activities in the three months ended March 31, 2005 and 2004 were as follows:

Cash, Cash Equivalents and Short-Term Investments

As of March 31, 2005, we had total cash, cash equivalents and short-term investments of $106.7 million, as compared to $50.6 million as of December 31, 2004. The increase of $56.1 million resulted primarily from net proceeds of $68.5 million from a public offering in February 2005, partially offset by cash used in operating activities.

As of March 31, 2005, all of our short-term investments in marketable securities have maturities of less than one year, and have been classified as available-for-sale securities, as defined by Statement of Financial Accounting Standards No. 115, “Accounting for Certain Investments in Debt and Equity Securities” (SFAS 115). These securities are recorded at their fair value and consist of corporate debt and asset-backed securities. We make our investments in accordance with our investment policy. The primary objectives of our investment policy are liquidity, safety of principal and diversity of investments.

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Sources and Uses of Capital

Our primary sources of liquidity to date have been cash from financing activities, collaboration receipts and our merger with Variagenics in January 2003. We plan to continue to raise funds through additional public and/or private offerings and collaboration activities in the future.

In February 2005, we raised $68.5 million in a public offering, net of underwriters’ fees and stock issuance costs of $4.8 million, from the sale of 9,775,000 shares of our common stock, including 1,275,000 shares related to the exercise of an over-allotment option granted to the underwriters, at a public offering price of $7.50 per share.

In August 2004, we entered into a Loan and Security Agreement (Loan Agreement), with Silicon Valley Bank that provides us with a $6.0 million term loan facility and a $4.0 million revolving credit line and grants Silicon Valley Bank a security interest over certain of our assets, excluding intellectual property. As a condition precedent to the Loan Agreement, we agreed, among other things, to certain covenants and reporting requirements. In December 2004, we completed a planned $2.6 million initial draw-down on the term loan, the proceeds of which were used entirely to repay a note for the same amount that was owed to AMB Property, LP in relation to the termination of a lease agreement for facilities at Humboldt Court, Sunnyvale, California. In March 2005, we completed a second draw-down under the term loan, of $1.5 million, with $0.6 million of these proceeds being used to pay off certain capital leases. We have not drawn-down any of the funds available under the revolving credit line, which is currently being used to collateralize a $4.0 million letter of credit issued to the Irvine Company related to the lease for the facility at 985 Almanor Avenue in Sunnyvale, California. The proceeds of all other term loan draw-downs and the revolving credit line may be used solely for our working capital or other general business requirements. Our term loan borrowings, except for the second draw-down, shall bear interest at a fixed rate per annum equal to the 36-month Treasury Rate in effect on the funding date plus 3.25%, and, in any event, shall not be less than 6.43% per annum, which is the rate applicable to the initial draw-down. The second draw-down was at a rate equal to the 36-month Treasury Rate in effect on the funding date plus 2.75%, being 6.78%. Our revolving credit line borrowings shall bear interest at Silicon Valley Bank’s prime rate in effect from time to time. As of March 31, 2005, we had received waivers for any breaches of related covenants and reporting requirements.

Dr. Rathmann, the chairman of our board of directors, provided us with a $20.0 million line of credit in August 2001, of which we have drawn down $11.0 million, with the remaining $9.0 million having expired unused. The related promissory note bears interest at the prime rate plus 1%. In November 2003, we began repaying the outstanding balance over 48 months with equal principal payments of $0.2 million. Accrued interest will be paid with the final payment in October 2007. As of March 31, 2005, the remaining principal and accrued interest to date totaled $8.6 million. The outstanding principal and interest under the note may be repaid at any time upon mutual agreement, by conversion into shares of our common stock at a price based upon the average price of our common stock over a 20-day period ending 2 days prior to the conversion or, if in connection with an equity financing, at the offering price. As of March 31, 2005, 1,248,175 shares would be issuable to fully repay the principal and interest outstanding upon conversion.

We issued Affymetrix a five-year promissory note for $4.0 million in November 2001, bearing a fixed annual interest rate of 7.5 %. Accrued interest will be paid with the final principal payment in November 2006. As of March 31, 2005, the remaining principal and accrued interest to date totaled $5.0 million. The outstanding principal and interest under the note may be repaid in whole or in part at any time, at our option, by conversion into shares of our common stock at a price based upon 90% of the average price of our common stock over a 10-day period ending 2 days prior to the conversion. As of March 31, 2005, 832,779 shares would be issuable to fully repay the principal and interest outstanding upon conversion. Affymetrix has the ability to declare all outstanding principal and interest under the note immediately due and payable if our market capitalization is under $50.0 million and Affymetrix reasonably determines that the loan evidenced by the note is impaired, and we have an obligation to prepay amounts owing under the note to the extent that the amounts outstanding exceed 10% of our market capitalization. Moreover, we have registered for resale a portion of these shares issuable to Affymetrix on a registration statement that has been declared effective by the SEC.

Our primary uses of capital resources to date have been to fund operating activities, including research and clinical development expenses, license payments and spending on capital items. We used cash of $12.4 million and $8.8 million for operating activities, and cash of $0.1 million and $0.2 million for the purchase of capital items, in the three months ended March 31, 2005 and 2004, respectively.

In August 2002, we amended our lease on the property at 985 Almanor Ave. to provide for a rent deferral of $4.9 million over the subsequent three years, retroactive to June 1, 2002. We will be required to repay the deferred rent liability, plus interest, over a four-year period beginning June 1, 2005 in equal monthly installments of $0.1 million. In October 2003, we amended the lease for a second time, to provide for an additional rent deferral. In order to receive this rent deferral, we pre-paid $2.7 million of base rental payments in October 2003 to cover the nine-month period beginning October 1, 2003 and ending June 30, 2004. The amendment provides that no base rent will be due for the period July 1, 2004 through March 30, 2005, resulting in a $2.9 million deferral and $0.2 million of savings. The deferral amount will be repaid on May 30, 2011, the end of the lease term. Other terms of the agreement include the ability to repay the $2.9 million deferred rent in 36 monthly installments of $0.1 million, commencing on June 1, 2011 if the lease term is extended for at least 36 months, and early reinstatement of the original rental rates if we successfully raise $75.0 million in a single public or private equity offering, with the remaining amount of rent deferred under both lease amendments up to that date coming due immediately.

Cash Used in Operating Activities

Net cash used in operating activities was $12.4 million in the three months ended March 31, 2005, as compared to $8.8 million in the corresponding period of 2004. The increase of $3.6 million was primarily due to a larger build-up of clinical trial and drug manufacturing liabilities in the three months ended March 31, 2004, as compared to that in the corresponding period of 2005.

We expect an increase in operating expenses in 2005, as we advance through the Phase 3 clinical trials for alfimeprase and continue to expand our drug development programs. In addition, we are required to pay Amgen a milestone fee of $5.0 million within 30 days of dosing of the first patient in the first Phase 3 clinical trial for alfimeprase, which occurred on April 15, 2005. Our future milestone payments for drug development under current agreements, including the $5.0 million payable to Amgen, could total $74.5 million if all milestones are achieved, which would significantly affect our future cash flows. We expect to pay only $5.0 million of this amount in 2005, as a milestone payment under the Amgen license agreement. If we are successful in reaching the commercialization stage, we will also be responsible for paying our collaboration and licensing partners certain product royalties, depending on product sales volumes. We do not foresee a significantly negative impact in our liquidity based on potential royalty payment obligations, as the majority of these payments are related to commercial sales, which provide us with offsetting cash inflows.

Cash Used in / Provided by Investing Activities

Net cash used in investing activities was $5.9 million in the three months ended March 31, 2005, as compared to $7.5 million of net cash provided in the corresponding period of 2004. The change of $13.4 million was primarily due to purchases of short-term investments of $16.1 million as a result of cash raised from the public offering completed in the 2005 period, partially offset by an increase in proceeds from the sales or maturities of short-term investments in this period.

We expect capital expenditures to increase during 2005 as compared to 2004, as we prepare our newly-leased facilities at 201 Industrial Road in San Carlos, California to be our primary headquarters.

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Cash Provided by Financing Activities

Net cash provided by financing activities was $68.5 million in the three months ended March 31, 2005, as compared to $68.8 million in the corresponding period of 2004. The decrease of $0.3 million was primarily due to a decrease in net proceeds from public offerings and other common stock issuances of $1.5 million, and increased payments on capital leases of $0.4 million, partially offset by the proceeds from a second draw-down on our term loan facility of $1.5 million.

Our future capital requirements and the adequacy of available funds will depend on many factors, including those set forth under “Risk Factors”. We may not be able to secure additional financing to meet our funding requirements on acceptable terms, if at all. If we raise additional funds by issuing equity securities, substantial dilution to our existing stockholders may result. If we are unable to obtain additional funds, we will have to reduce our operating costs and delay our research and development programs. We believe that we have adequate cash reserves to fund our operations through 2006.

Contractual Obligations

The following table summarizes our significant contractual obligations as of March 31, 2005, and the effect such obligations are expected to have on our liquidity and cash flow in the remainder of 2005 and future periods (in thousands):

The foregoing table does not include milestone payments potentially payable by us under our collaboration agreements and licenses. Such milestone payments are dependent upon the occurrence of specific milestones events and not the passage of time. No milestones were achieved as of March 31, 2005 and therefore no contractual obligations were triggered as of that date. We currently expect only one milestone to be achieved in 2005, being a payment to Amgen of $5.0 million in the second quarter, as a result of dosing of the first patient in the first phase 3 clinical trial for alfimeprase, which occurred on April 15, 2005. We estimate that a milestone payment of $10.0 million, that is payable to Archemix upon dosing of the first patient in a Phase 2 trial, could occur in the first half of 2006.

Critical Accounting Policies and Estimates

Our discussion and analysis of our operating results and financial condition is based upon our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States of America. The preparation of the financial statements requires us to make estimates, judgments, and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent amounts. While we believe our estimates, judgments and assumptions are reasonable, the inherent nature of estimates is that actual results will likely be different from the estimates made.

We believe the following critical accounting policies, among others, affect the more significant judgments and estimates used in the preparation of our consolidated financial statements.

Clinical Trial Drug Manufacturing Expense and Clinical Trial Supplies Asset

In accordance with Financial Accounting Standards Board (FASB) Statement of Financial Accounting Standards No. 2, “Accounting for Research and Development Costs” (SFAS 2), we capitalize clinical trial drug manufacturing costs as Clinical Trial Supplies, a current asset on our balance sheet, as long as there are alternative future uses for the related clinical trial drug material in other indications not currently being studied, (e.g., for alfimeprase, these include deep-vein thrombosis, stroke and acute myocardial infarction). We recognize clinical trial drug manufacturing expense when completed drug material is shipped from the manufacturing or storage facility to the packaging and distribution facility. On a quarterly basis we evaluate if there continues to be alternative future use for any capitalized drug material, and if the material is obsolete or in excess of anticipated requirements. Any capitalized drug material will be charged to expense in the quarter in which there ceases to exist an alternative future use, or if the material is obsolete or in excess of anticipated requirements, which may result in a significant adverse impact to our financial condition and results of operations.

Impairment or Disposal of Long-Lived Assets

Periodically, we determine whether any long-lived asset or related asset group has been impaired based on the criteria established in Statement of Financial Accounting Standards No. 144, “Accounting for the Impairment or Disposal of Long-Lived Assets” (SFAS 144). SFAS 144 requires, among other things, that impairment losses be recognized whenever the carrying amount of the asset or asset group exceeds its fair value. Intangibles with determinable useful lives and other long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable, and we perform an annual impairment review regardless of any such events or changes. Our judgments regarding the existence of impairment indicators are based on historical and projected future operating results, changes in the manner of our use of the acquired assets, our overall business strategy or market and economic trends. Events may occur that could cause us to conclude that impairment indicators exist and that certain long-lived assets or related asset groups are impaired, which may result in a significant adverse impact to our financial condition and results of operations.

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Goodwill

We applied the provisions of Statement of Financial Accounting Standards No. 142, “Goodwill and Other Intangible Assets” (SFAS 142) upon the completion of the merger with Variagenics in January 2003. SFAS 142 requires that goodwill and intangible assets with indefinite useful lives no longer be amortized, but instead be tested for impairment at least annually in accordance with provisions of SFAS 142. SFAS 142 also requires that intangible assets with estimable useful lives be amortized over their respective estimated useful lives, and reviewed for impairment in accordance with SFAS 144.

The SFAS 142 goodwill impairment model involves a two-step process. During the first step, we compare the fair value of the reporting unit with its carrying value, including goodwill. The estimated fair value of the reporting unit, in this case the Nuvelo business segment, being the only business segment in the company, is computed by multiplying the quoted market price of the company’s common stock on the Nasdaq National Market by the outstanding common stock of the company at that time.

If the fair value of the reporting unit is determined to be more than its carrying value, including goodwill, no goodwill impairment is recognized. If the fair value of the reporting unit is determined to be less than its carrying value, goodwill impairment, if any, is computed using the second step. The second step requires the fair value of the reporting unit to be allocated to all the assets and liabilities of the reporting unit as if the reporting unit had been acquired in a business combination at the date of the impairment test and the fair value of the reporting unit was the price paid to acquire it. The excess of the fair value of the reporting unit over the amounts assigned to its assets and liabilities is the implied value of goodwill, which is used to determine the impairment amount.

We have designated October 31 as the annual impairment testing date for our goodwill, although additional testing may be performed if circumstances warrant a re-evaluation. If it is determined that the carrying value of goodwill has been impaired, the value would be reduced by a charge to operations in the amount of the impairment, which may result in a significant adverse impact to our financial condition and results of operations. There was assessed to be no goodwill impairment based on the testing performed on October 31, 2004.

Clinical Trial and Drug Manufacturing Accruals

We accrue costs for clinical trial and drug manufacturing activities based upon estimates of the services received and related expenses incurred that have yet to be invoiced by the contract research organizations (CROs), clinical study sites, drug manufacturers, collaboration partners, laboratories, consultants, or other clinical trial vendors that perform the activities. Related contracts vary significantly in length, and may be for a fixed amount, a variable amount based on actual costs incurred, capped at a certain limit, or for a combination of these elements. Activity levels are monitored through close communication with the CROs and other clinical trial vendors, including detailed invoice and task completion review, analysis of expenses against budgeted amounts, and pre-approval of any changes in scope of the services to be performed. Each CRO and significant clinical trial vendor provides an estimate of costs incurred but not invoiced at the end of each period for each individual trial. The estimates are reviewed and discussed with the CRO or vendor as necessary, and are included in research and development expenses for the related period. For clinical study sites, which are paid quarterly on a per-patient basis to the institutions performing the clinical study, we accrue an estimated amount based on patient enrollment in each quarter. All estimates may differ significantly from the actual amount subsequently invoiced. No adjustments for material changes in estimates have been recognized in any period presented.

Revenue Recognition

We recognize revenue when (i) persuasive evidence of an arrangement exists, (ii) delivery has occurred or services have been rendered, (iii) the price is fixed and determinable, and (iv) collectibility is reasonably assured. We defer upfront refundable fees and recognize revenues upon the later of when they become nonrefundable or when performance obligations are completed. In situations where we have no continuing performance obligations, we recognize upfront nonrefundable fees as revenues on the effective date of the related agreement. In situations where continuing performance obligations exist, we defer and amortize upfront nonrefundable fees over the performance period. Revenues related to collaborative research agreements and government grants are generally recognized over the related funding periods for each contract as the services are performed. The terms of such arrangements may cause our operating results to vary considerably from period to period.

Stock-Based Compensation

In accordance with the provisions of Statement of Financial Accounting Standards No. 123, “Accounting for Stock-Based Compensation” (SFAS 123), as amended by SFAS No. 148, “Accounting for Stock-Based Compensation — Transition and Disclosure” (SFAS 148) we have elected to account for stock-based compensation to employees under the provisions of Accounting Principles Board Opinion No. 25, “Accounting for Stock Issued to Employees,” and its related interpretations, and to adopt the “disclosure only” alternative described in SFAS 123, as amended by SFAS 148. Stock options granted to non-employees are accounted for in accordance with SFAS 123 and Emerging Issues Task Force No. 96-18, “Accounting for Equity Instruments that Are Issued to Other than Employees for Acquiring, or in Conjunction with Selling, Goods or Services.” Effective from the beginning of our 2006 fiscal year, we will be subject to Statement of Financial Accounting Standards No. 123 (revised 2004), “Share-Based Payment”, which is expected to have a material adverse effect on our consolidated financial statements (see Recent Accounting Pronouncements below).

Income Taxes

Income taxes are accounted for under the asset and liability method pursuant to Statement of Financial Accounting Standards No. 109, “Accounting for Income Taxes” (SFAS 109). Under SFAS 109, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date.

We record a valuation allowance to reduce deferred income tax assets to an amount that is more likely than not to be realized. Assessment of the realization of deferred income tax assets requires that estimates and assumptions be made as to the taxable income of future periods. Our deferred tax assets are reduced to zero, as management believes that it is more likely than not that the deferred tax assets will not be realized. Projection of future period earnings is inherently difficult as it involves consideration of numerous factors such as our overall strategies and estimates of new product development and acceptance, product lifecycles, selling prices and volumes, responses by competitors, manufacturing costs and assumptions as to operating expenses and other industry specific and macro and micro economic factors. In addition, consideration is also given to ongoing and constantly evolving global tax laws and our own tax minimization strategies.

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Recent Accounting Pronouncements

On December 16, 2004, the FASB issued Statement of Financial Accounting Standards No. 123 (revised 2004), “Share-Based Payment” (SFAS 123(R)), an amendment of Statements of Financial Accounting Standards No. 123 and 95, that addresses the accounting for share-based awards to employees. The standard requires companies to recognize as an expense the fair value of stock options and other stock-based compensation to employees. The statement eliminates the ability to account for share-based compensation transactions using APB Opinion No. 25, “Accounting for Stock Issued to Employees,” (APB 25), and generally requires instead that companies account for such transactions using a fair value based method, such as the Black-Scholes option pricing model, to fairly value stock options and recognize that value as an expense. The standard will be effective for public companies as of the beginning of the first fiscal year after June 15, 2005. We currently account for our stock-based compensation plans in accordance with APB 25. SFAS 123(R) offers companies alternative methods of adopting this standard. At present, we have not yet determined which method we will adopt, but regardless of the method, adoption of this statement is expected to have a material adverse effect on our consolidated financial statements.

Off-Balance Sheet Arrangements

We have not participated in any transactions with unconsolidated entities, such as special purpose entities (SPEs), which would have been established for the purpose of facilitating off-balance sheet arrangements.

Indemnifications

In the ordinary course of business, we enter into contractual arrangements under which we may agree to indemnify certain parties from any losses incurred relating to the services they perform on our behalf or for losses arising from certain events as defined within the particular contract. Such indemnification obligations may not be subject to maximum loss clauses. Historically, payments made related to these indemnifications have been immaterial. In addition, we have entered into indemnity agreements with each of our directors and executive officers. Such indemnity agreements contain provisions, which are in some respects broader than the specific indemnification provisions contained in Delaware law. We also maintain an insurance policy for our directors and executive officers insuring against certain liabilities arising in their capacities as such.

RISK FACTORS

We operate in a rapidly changing environment that involves a number of risks, some of which are beyond our control. The following discussion highlights some of these risks.

RISKS RELATED TO OUR BUSINESS

Development of our products will take years, and our products require regulatory approval before they can be sold.

We have three clinical stage drug candidates. All of our other potential products currently are in research or pre-clinical development and revenues from the sales of any products resulting from this research and development may not occur for several years, if at all. We cannot be certain that any of our products will be demonstrated to be safe and effective or that we will obtain regulatory approvals. We cannot predict whether we will be able to develop and commercialize any of our drug candidates successfully. If we are unable to obtain regulatory approval and successfully commercialize our potential products, our business, results of operations and financial condition will be affected in a materially adverse manner.

We do not yet have products in the commercial markets. We must demonstrate that our product candidates satisfy rigorous standards of safety and efficacy before the FDA and comparable agencies in foreign markets. We cannot apply for regulatory approval of our potential products until we have performed significant additional research and development and testing. We cannot be certain that we, or our strategic partners, will be permitted to undertake clinical testing of our potential products or continue clinical testing of alfimeprase, rNAPc2, or ARC183. If we are successful in initiating clinical trials, we may experience delays in conducting them. Our clinical trials may not demonstrate the safety and efficacy of our potential products, and we may encounter unacceptable side effects or other problems in the clinical trials that may prevent or limit the use of our products. Should this occur, we may have to delay or discontinue development of the potential product that causes the problem. After a successful clinical trial, we cannot market products in the United States until we receive regulatory approval. Even if we are able to gain regulatory approval of our products after successful clinical trials and then commercialize and sell those products, we may be unable to manufacture enough products to maintain our business, which could have a negative impact on our financial condition.

Our clinical trials may not yield results that will enable us to obtain regulatory approval for our products.

We will only receive regulatory approval for a drug candidate if we can demonstrate in carefully designed and conducted clinical trials that the drug candidate is safe and effective. We do not know whether our pending or any future clinical trials will demonstrate sufficient safety and efficacy to obtain the requisite regulatory approvals or will result in marketable products. Clinical trials are lengthy, complex, and expensive processes with uncertain results. It will take us several years to complete our testing, and failure can occur at any stage of testing. Results attained in pre-clinical testing and early clinical studies, or trials, may not be predictive of results that are obtained in later studies. We may suffer significant setbacks in advanced clinical trials, even after promising results in earlier studies. Based on results at any stage of clinical trials, we may decide to repeat or redesign a trial or discontinue development of one or more of our drug candidates. If we fail to adequately demonstrate the safety and efficacy of our products under development, we will not be able to obtain the required regulatory approvals to commercialize our drug candidates, and our business, results of operations and financial condition will be materially adversely affected.

Clinical trials are subject to continuing oversight by governmental regulatory authorities and institutional review boards (IRBs), and must meet the requirements of these authorities in the United States, including those for informed consent and good clinical practices. We may not be able to comply with these requirements and the FDA, an IRB or we may suspend or terminate clinical trials at any time.

Administering our drug candidates to humans may produce undesirable side effects. These side effects could interrupt, delay or halt clinical trials of our drug candidates and could result in the FDA or other regulatory authorities denying approval of our drug candidates for any or all targeted indications.

We rely on third parties, including contract research organizations and outside consultants, to assist us in managing and monitoring clinical trials. Our reliance on these third parties may result in delays in completing, or in failing to complete, these trials if they fail to perform with the speed and competency we expect.

If clinical trials for a drug candidate are unsuccessful, we will be unable to commercialize the drug candidate. If one or more of our clinical trials are delayed, we will be unable to meet our anticipated development or commercialization timelines. Either circumstance could cause the price of our shares to decline.

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If we encounter difficulties enrolling patients in our clinical trials, our trials could be delayed or otherwise adversely affected.

Clinical trials for our drug candidates require that we identify and enroll a large number of patients with the disorder under investigation. We may not be able to enroll a sufficient number of patients to complete our clinical trials in a timely manner.

Patient enrollment is affected by factors including:

If we have difficulty enrolling a sufficient number of patients to conduct our clinical trials as planned, we may need to delay or terminate ongoing or planned clinical trials, either of which would have a negative effect on our business. Delays in enrolling patients in our clinical trials would also adversely affect our ability to generate product and royalty revenues and could impose significant additional costs on us or on our collaborators. In addition, prior to initiating our current Phase 3 PAO trial for alfimeprase, we have never conducted Phase 3 clinical trials, and we may be unable to successfully conduct multiple Phase 3 clinical trials involving the numbers of clinical sites and the numbers of patients planned for our alfimeprase Phase 3 clinical trials.

We face heavy government regulation, and FDA regulatory approval of our products is uncertain.

The research, testing, manufacturing and marketing of drug products such as those proposed to be developed by us or our collaboration partners are subject to extensive regulation by federal, state and local governmental authorities, including the FDA, and comparable agencies in other countries. To obtain regulatory approval of a drug product, we or our collaboration partners must demonstrate to the satisfaction of the applicable regulatory agency, among other things, that the product is safe and effective for its intended uses. In addition, we must show that the manufacturing facilities used to produce the products are in compliance with current Good Manufacturing Practices (cGMP) requirements.

The process of obtaining FDA and other required regulatory approvals and clearances typically takes several years and will require us to expend substantial capital and resources. Despite the time and expense expended, regulatory approval is never guaranteed. The number of pre-clinical and clinical tests that will be required for FDA approval varies depending on the drug candidate, the disease or condition that the drug candidate is in development for, and the regulations applicable to that particular drug candidate. The FDA or comparable international regulatory authorities can delay, limit or deny approval of a drug candidate for many reasons, including:

Moreover, if and when our products do obtain such approval or clearances, the marketing, distribution and manufacture of such products would remain subject to extensive ongoing regulatory requirements. Failure to comply with applicable regulatory requirements could result in:

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Any delay or failure by us, or our collaboration partners, to obtain regulatory approvals for our product candidates:

Even if we do receive regulatory approval for our drug candidates, the FDA or international regulatory authorities may impose limitations on the indicated uses for which our products may be marketed, subsequently withdraw approval or take other actions against us, or our products, that are adverse to our business. The FDA and comparable international regulatory authorities generally approve products for particular indications. An approval for a limited indication reduces the size of the potential market for the product. Product approvals, once granted, may be withdrawn if problems occur after initial marketing.

We also are subject to numerous federal, state and local laws, regulations and recommendations relating to safe working conditions, laboratory and manufacturing practices, the experimental use of animals, the environment and the use and disposal of hazardous substances used in connection with our discovery, research and development work, including radioactive compounds and infectious disease agents. In addition, we cannot predict the extent of government regulations or the impact of new governmental regulations that might significantly harm the discovery, development, production and marketing of our products. We may be required to incur significant costs to comply with current or future laws or regulations, and we may be adversely affected by the cost of such compliance.

If we fail to maintain existing third-party arrangements and collaborative agreements or fail to develop new collaborative arrangements, our business will be harmed.

The success of our business is dependent, in significant part, upon our ability to enter into multiple collaboration agreements and to manage effectively the numerous issues that arise from such arrangements. Management of our relationships with these third parties has required and will require:

In October 2004, Amgen Inc. exercised its rights under the collaboration agreement entered into in January 2002 to convert the relationship from a collaboration into a licensing arrangement in accordance with terms agreed upon by us and Amgen. In November 2004, we entered into a license agreement with Amgen granting us worldwide rights to develop and commercialize alfimeprase in exchange for payment of previously negotiated development milestones and royalties. We are required to pay Amgen $5.0 million within 30 days of dosing of the first patient in the first Phase 3 clinical trial for alfimeprase, which occurred on April 15, 2005. Additional future milestone payments under the license agreement could total as much as $35.0 million. Under the terms of the license agreement, Amgen will transfer the technology necessary for the manufacture of alfimeprase to us or to our designated manufacturer. Amgen is required to continue to supply alfimeprase to us during the transition period. On January 21, 2005, we entered into an Interim Agreement with Avecia Limited (Avecia), our designated manufacturer, for the manufacture of alfimeprase, and we are currently in negotiations with Avecia for a definitive agreement for the manufacture of commercial quantities of alfimeprase. Either party may terminate this agreement at any time. While we currently believe we have enough supplies of alfimeprase for phase 3 trials for the treatment of acute PAO and catheter occlusion, additional supplies may be necessary, and we do not yet have a definitive agreement for the manufacture of additional supplies of alfimeprase. We cannot be certain that we will be able to reach a definitive agreement with Avecia or any other manufacturer, upon commercially reasonable terms for alfimeprase’s manufacture or that Avecia or any other manufacturer will be able to produce alfimeprase in the quantities and with the quality we need for our clinical trials. If we are unable to find a manufacturer, or manufacturers, to produce alfimeprase in the quantities and with the quality we need, at a commercially reasonable price, we may incur significant, additional expenses and our efforts to complete our clinical trials and obtain FDA approval to market alfimeprase could be significantly delayed.

In our collaboration with Archemix for the development and commercialization of ARC183, we share equally all research and development costs and revenues since our initial funding of these costs reached $4.0 million in the third quarter of 2004. We are obligated to make milestone payments of $10.0 million upon the first dosing of a patient in a Phase 2 trial and $1.0 million upon the designation of any backup compound selected by both Nuvelo and Archemix for pre-clinical studies. The payment of $10.0 million upon reaching the Phase 2 milestone is payable even if Archemix voluntarily terminates the collaboration, or does not meet its obligations under the agreement and we terminate the collaboration for Archemix’s default. We have the option to lead commercialization in which both parties may participate if we establish certain commercialization capabilities; however, if we do not establish such commercialization capabilities, Archemix, or a third party selected by the parties’ joint steering committee, will have the option to lead commercialization. We do not currently have established commercialization experience or an internal trained sales force and we may not successfully develop such capabilities without incurring additional expenses. If we cannot develop an internal sales force, we will not be able to lead commercialization activities on our own. If we do not lead the commercialization efforts, we are dependent on Archemix or a third party’s experience in commercialization and ability to perform and we may also incur additional expenses for a third party to undertake commercialization efforts.

We are subject to a number of additional risks associated with our collaboration with Archemix for ARC183, including the right of Archemix to terminate its collaboration with us on limited notice and for reasons outside our control, and to the loss of significant rights if the collaboration is terminated because we fail to meet our obligations under it. In particular, if Archemix terminates the collaboration for our breach, all of our rights to ARC183 and other collaboration products will become the property of Archemix, and we may not practice certain activities related to anti-thrombin compounds in the field of modifying blood-clotting times in therapeutic applications through the use of aptamers such as ARC183, including research and development, manufacturing and commercialization activities.

Pursuant to our licensing arrangement with Dendreon relating to rNAPc2, we are obligated to make milestone payments ranging from $2.0 million to $6.0 million upon the first dosing of the first patient in a Phase 3 clinical trial, upon submission of a new drug application (NDA), and upon commercialization for the first and second indications. If all milestones are achieved, total milestone payments to Dendreon can reach as much as $23.5 million.

On March 31, 2005, we entered into a new collaboration agreement with the Pharmaceutical Division of Kirin Brewery Company, Ltd. (Kirin) for the development and commercialization of NU206. All operating expenses and profits related to the development and commercialization of NU206 will be shared in a 60 (Nuvelo) / 40

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(Kirin) ratio. If the NU206 Agreement is terminated, or Nuvelo or Kirin elects under certain circumstances to no longer actively participate in the collaboration, the relationship with respect to NU206 will convert from an expense and profit sharing structure to a royalty based structure. Under the original collaboration agreement with Kirin, we will continue to jointly own discoveries resulting from this collaboration and to jointly develop and market the resulting products while sharing costs, efforts and revenues with Kirin.

Our efforts to manage simultaneously a number of collaboration arrangements may not be successful, and our failure to manage effectively such collaborations would significantly harm our business, financial condition and results of operations.

Due to these factors and other possible disagreements with Amgen, Archemix, Dendreon or Kirin, we may be delayed or prevented from developing or commercializing alfimeprase, ARC183, rNAPc2 and NU206, or other pre-clinical product candidates, or we may become involved in litigation or arbitration, which would be time-consuming or expensive and could have a material adverse effect on our stock price.

In addition to our existing collaborations, we will focus on effecting new collaborative arrangements where we would share costs of identifying, developing and marketing drug candidates. We cannot assure you that we will be able to negotiate new collaboration arrangements of this type on acceptable terms, or at all.

We are currently dependent on third parties for a variety of functions and may enter into future arrangements for the manufacture and sale of our products. Our arrangements with these third parties may not provide us with the benefits we expect.

We currently rely upon third parties to perform administrative functions and functions related to the research, development, pre-clinical testing and clinical trials of our drug candidates. In addition, because we do not have the resources, facilities or experience to manufacture our drug candidates on our own, we currently rely, and will continue to rely, on third parties to manufacture our drug candidates for clinical trials, and, if our products are approved, in quantities for commercial sales. We currently rely on a number of sole-source service providers and suppliers and do not have long-term supply agreements with our third-party manufacturers.

We do not currently have significant manufacturing facilities for clinical or commercial production of our drug candidates and depend on contract research and manufacturing organizations. We may not be able to finalize contractual arrangements, transfer technology or maintain relationships with such organizations in order to file an investigational new drug application (IND) with the FDA, and proceed with clinical trials for any of our drug candidates. Until now, we have relied on Amgen to manufacture our clinical drug product, alfimeprase. We have entered into an Interim Agreement with Avecia and are in the process of transitioning manufacture of alfimeprase from Amgen to Avecia, but do not yet have a definitive agreement with Avecia for the manufacture of commercial quantities of alfimeprase. If our efforts are unsuccessful, we may not have adequate supplies of alfimeprase to complete our clinical trials or to commercialize alfimeprase on our anticipated schedule.

We are dependent on third-party contract research organizations to conduct certain research, including good laboratory practices toxicology studies, in order to gather the data necessary to file INDs with the FDA for any of our drug candidates. Our drug candidates have never been manufactured on a commercial scale. Third-party manufacturers may not be able to manufacture these drug candidates at a cost or in quantities necessary to make them commercially viable. In addition, if and when any of our other drug candidates enter the clinical trial phase, we will initially depend on third-party contract manufacturers to produce the volume of cGMP grade material needed to complete such trials. We will need to enter into contractual relationships with these or other organizations in order to (1) complete the Good Laboratory Practices (GLP) toxicology and other studies necessary to file an IND with the FDA, and (2) produce a sufficient volume of cGMP grade material in order to conduct clinical trials of ARC183 and our other drug candidates. We cannot be certain that we will be able to do so on a timely basis or that we will be able to obtain sufficient quantities of material on commercially reasonable terms. In addition, the failure of any of these relationships with third-party contract organizations may delay our filing for an IND or impede our progress through the clinical trial phase. Any significant delay or interruption would have a material adverse effect on our ability to file an IND with the FDA and/or proceed with the clinical trial phase for any of our drug candidates.

Moreover, contract manufacturers that we may use must continually adhere to cGMP regulations enforced by the FDA through a facilities inspection program. If one of our contract manufacturers fails to maintain compliance, the production of our product candidates could be interrupted, resulting in delays, additional costs and potentially lost revenues. In addition, if the facilities of such manufacturers do not pass a pre-approval plant inspection, the FDA will not grant pre-market approval of our products.

Our reliance on these relationships poses a number of risks, including:

Given these risks, our current and future collaborative efforts with third parties may not be successful. If these efforts fail, we would be required to devote additional internal resources to the activities currently performed, or to be performed, by third parties, to seek alternative third-party collaborators, or to delay our product development or commercialization.

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We may not achieve our projected development goals in the time frames we announce and expect.

We set goals for and make public statements regarding the timing of certain accomplishments, such as the commencement and completion of clinical trials, anticipated regulatory approval dates and time of product launch, which we sometimes refer to as milestones. The actual timing of these events can vary dramatically due to a number of factors such as delays or failures in our clinical trials, the uncertainties inherent in the regulatory approval process and delays in achieving manufacturing or marketing arrangements sufficient to commercialize our products. There can be no assurance that our clinical trials will be completed, that we will make regulatory submissions or receive regulatory approvals as planned or that we will be able to adhere to our current schedule for the launch of any of our products. If we fail to achieve one or more of these milestones as planned, our business will be materially adversely affected and the price of our shares could decline.

The success of our potential products in pre-clinical studies does not guarantee that these results will be replicated in humans.

Although our clinical development-stage drug candidates have shown results in pre-clinical studies, these results may not be replicated in our clinical trials with humans. Consequently, there is no assurance that the results in our pre-clinical studies are predictive of the results that we will see in our clinical trials with humans or that they are predictive of whether the resulting products will be safe and effective in humans.

We are dependent on key personnel and we must attract and retain qualified employees, collaborators and consultants.

The success of our business is highly dependent on the principal members of our scientific and management staff, including our senior management team. The loss of the services of any such individual might seriously harm our product development and commercialization efforts. In addition, we will require additional skilled personnel in areas such as clinical development. Retaining and training personnel with the requisite skills is challenging, and, if general economic conditions improve, is likely to become extremely competitive, particularly in Northern California, where we are located.

Our success will depend on our ability to attract and retain qualified employees to help develop our potential products and execute our research and development strategy. We have programs in place to retain personnel, including programs to create a positive work environment and competitive compensation packages. Because competition for employees in our field is intense, however, we may be unable to retain our existing personnel or attract additional qualified employees. Our success also depends on the continued availability of outside scientific collaborators, including collaborators at research institutions, to perform research and develop processes to advance and augment our internal research efforts. Competition for collaborators is intense. We also rely on services provided by outside consultants. Attracting and retaining qualified outside consultants is competitive, and, generally, outside consultants can terminate their relationship with us at will. If we do not attract and retain qualified personnel, outside consultants and scientific collaborators, or if we experience turnover or difficulties recruiting new employees or outside consultants, our research and development programs could be delayed and we could experience difficulties in generating sufficient revenue to maintain our business.

In addition, we do not currently have a marketing and sales organization. As the potential commercialization of our products approaches, we intend to hire marketing and sales personnel to enable us to participate in the commercialization of our products in the United States. If we are unsuccessful in hiring and retaining sales and marketing personnel with appropriate qualifications and talent, our ability to generate product revenues would be adversely affected.

Because we have not yet commercialized any of our drug candidates, our ability to develop and subsequently commercialize products is unproven.

We have not yet commercialized any of our in-licensed therapeutic product candidates. Moreover, we have not developed any therapeutic products using proteins produced by the genes we have discovered in our internal research programs. Before we make any products available to the public from our internal research and development programs, we or our collaboration partners will need to conduct further research and development and complete laboratory testing and animal and human studies. We, or our collaboration partners, will need to obtain regulatory approval before releasing any drug products. We have spent, and expect to continue to spend, significant amounts of time and money in our internal research programs in determining the function of genes and the proteins they produce, using our own capabilities and those of our collaboration partners. Such a determination process constitutes the first step in developing commercial products from our internal research programs. We also have spent and will continue to spend significant amounts of time and money in developing processes for manufacturing of our recombinant proteins under pre-clinical development, yet we may not be able to produce sufficient proteins for pre-clinical studies. A commercially viable product may never be developed from our gene discoveries.

Our commercialization of products is subject to several risks, including but not limited to:

Our internal drug development programs are currently in the research stage or in pre-clinical development. None of our potential therapeutic protein candidates from our own portfolio has advanced to Phase 1 clinical trials. Our programs may not move beyond their current stages of development. Even if our internal research does advance, we will need to engage in certain additional pre-clinical development efforts to determine whether a product is sufficiently safe and effective to enter clinical trials. We have little experience with these activities and may not be successful in developing or commercializing products.

Under our Original Agreement with Kirin, Kirin has primary responsibility for clinical development in its territory and we have primary responsibility in our territory. Under our collaboration with Archemix, Archemix leads development until the first dosing of a patient in a Phase 2 clinical trial, and thereafter, a joint steering committee will designate one party to lead development until commercialization. With respect to these arrangements, we run the risk that Kirin or Archemix may not pursue clinical development in a timely or effective manner.

Any regulatory approvals that we or our collaboration partners receive for our product candidates may be subject to limitations on the intended uses for which the product candidates may be marketed or contain requirements for potentially costly post-marketing follow-up studies. In addition, if the FDA approved of our or our collaboration partners’ product candidates, the labeling, packaging, adverse event reporting, storage, advertising, promotion and record-keeping for the products will be subject to extensive regulatory requirements.

We, our collaborators and our suppliers, may also not be able to produce any products in commercial quantities at a reasonable cost or may not be able to successfully market such products. If we do not develop a commercially viable product, then we will suffer significant harm to our business, financial condition and operating results.

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We lack marketing and commercialization experience for biopharmaceutical products and we may have to rely on third parties for these capabilities.

We currently have no sales, marketing or distribution capability. As the potential commercialization of our products approaches, we intend to hire marketing and sales personnel to enable us to participate in the commercialization of our products in the United States. If we are unsuccessful in hiring and retaining sales and marketing personnel with appropriate technical and sales expertise or in developing an adequate distribution capability to support them, our ability to generate product revenues would be adversely affected. To the extent we cannot or choose not to use internal resources for the marketing, sales or distribution of any potential products in the United States or elsewhere, we intend to rely on collaboration partners or licensees. We may not be able to establish or maintain such relationships. To the extent that we depend on collaboration partners or other third parties for marketing and distribution, any revenues we receive will depend upon their efforts. Such efforts may not be successful, and we will not be able to control the amount and timing of resources that collaboration partners or other third parties devote to our products.

Our products may not be accepted in the marketplace, and we may not be able to generate significant revenue, if any.

Even if they are approved for marketing, our products, if any, may never achieve market acceptance among physicians, patients and the medical community. Our products, if successfully developed, will compete with a number of traditional drugs and therapies manufactured and marketed by major pharmaceutical and other biotechnology companies. Our products will also compete with new products currently under development by such companies and others. The degree of market acceptance of any products developed by us, alone, or in conjunction with our collaboration partners, will depend on a number of factors, including:

Physicians, patients or the medical community in general may not accept and utilize any of the products that we alone, or in conjunction with our collaboration partners, develop. In practice, competitors may be more effective in marketing their drugs. The lack of such market acceptance would significantly harm our business, financial condition and results of operations.

Even if our product candidates are approved for marketing and are accepted by physicians, patients and the medical community, the size of the market for these products may be insufficient to sustain our business, or may not provide an acceptable return on our investment in the development of these products. For example, our lead product candidate, alfimeprase, is undergoing clinical trials for the treatment of acute PAO. There are currently no thrombolytic agents approved for the treatment of acute PAO, and as a result there is currently limited market data available for us to use in judging the market size for a therapeutic product of this nature. The number of incidents of acute PAO that are treatable with an approved thrombolytic agent may not be sufficient to create a sustainable market for alfimeprase, if approved. As a result, the commercialization of alfimeprase for the treatment of acute PAO, or any of our other product candidates, could fail even if we receive marketing approval from the FDA and acceptance by the medical and patient communities.

We face intense competition.

The biopharmaceutical industry is intensely competitive and is accentuated by the rapid pace of technological development. We expect to face increased competition in the future as new companies enter our markets. Research and discoveries by others may result in breakthroughs that render our potential products obsolete even before they begin to generate any revenue. Our competitors include major pharmaceutical and biotechnology firms, many of which have substantially greater research and product development capabilities and financial, scientific, marketing and human resources than we have. Our lead product candidate alfimeprase, if approved, will face competition in the catheter occlusion indication from alteplase, an approved Genentech, Inc. product, and will potentially face competition in the peripheral arterial occlusion, or PAO, indication from product candidates being developed and/or marketed by Abbot Laboratories, Centocor, Inc. and Genentech.

Our competitors may obtain patents and regulatory approvals for their competing products more rapidly than we, or our collaboration partners, or develop products that are more effective than those developed by us, or our collaboration partners. Any potential products based on genes we identify ultimately will face competition from other companies developing gene-based products as well as from companies developing other forms of treatment for diseases which may be caused by, or related to, the genes we identify. Similarly, our products will face competition from other companies developing similar products as well as from companies developing other forms of treatment for the same conditions.

Many of the companies developing competing products have significantly greater financial resources than we have. Many such companies also have greater expertise than we or our collaboration partners have in discovery, research and development, manufacturing, pre-clinical and clinical testing, obtaining regulatory approvals and marketing. Other smaller companies may also prove to be significant competitors, particularly through collaborative arrangements with large and established companies. These companies and institutions compete with us in recruiting and retaining qualified scientific and management personnel as well as in acquiring technologies complementary to our programs. We will face competition with respect to:

There can be no assurance that research and development by others will not render the products that we may develop obsolete or uneconomical, or result in treatments or cures superior to any therapy developed by us or that any therapy we develop will be preferred to any existing or newly developed alternative products.

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We face uncertainty with respect to coverage, pricing, third-party reimbursements and health care reform.

Our ability to collect significant royalties from our products may depend on our ability, and the ability of our collaboration partners or customers, to obtain adequate levels of coverage for our products and reimbursement from third-party payers such as:

Third-party payers may deny coverage or offer inadequate levels of reimbursement if they determine that a prescribed product or device has not received appropriate clearances from the FDA or other government regulators, is not used in accordance with cost-effective treatment methods as determined by the third-party payer, or is experimental, unnecessary or inappropriate. If third-party payers deny coverage or offer inadequate levels of reimbursement, we may not be able to market our products effectively. We also face the risk that we will have to offer our products at prices lower than anticipated as a result of the current trend in the United States towards managed health care through health maintenance organizations. Currently, third-party payers are increasingly challenging the prices charged for medical products and services. Prices could be driven down by health maintenance organizations that control or significantly influence purchases of health care services and products. Existing U.S. laws, such as the Medicare Prescription Drug and Modernization Act of 2003, or future legislation to reform health care or reduce government insurance programs could also adversely affect prices of our approved products, if any. The cost containment measures that health care providers are instituting and the results of potential health care reforms may prevent us from maintaining prices for our products that are sufficient for us to realize profits and may otherwise significantly harm our business, financial condition and operating results. In addition, to the extent that our products are marketed outside of the United States, foreign government pricing controls and other regulations may prevent us from maintaining prices for our products that are sufficient for us to realize profits and may otherwise significantly harm our business, financial condition and operating results.

We may merge with or acquire other companies and our failure to receive the anticipated benefits in these transactions could harm our business.

In January 2003, we merged with Variagenics, and we may merge with or acquire other companies in the future. The success of any merger or acquisition depends, in part, on our ability to realize the anticipated synergies, cost savings and growth opportunities from integrating the business of the merged or acquired company with our business. The integration of two independent companies is a complex, costly and time-consuming process. The difficulties of combining the operations of the companies and/or our subsidiary include, among others:

Moreover, we have assumed the costs of defending against litigation claims asserted against Variagenics, and anytime we or our subsidiary merge with or acquire another company, we will be exposed to similar costs. In addition, we may be exposed to a number of other risks in connection with future transactions, including:

We cannot assure you that we will receive all of the anticipated benefits of any mergers or acquisitions, or that any of the risks described above will not occur. Our failure to receive anticipated benefits of, and our exposure to inherent risks in, any such merger or acquisition transaction could significantly harm our business, financial condition and operating results.

We are subject to the risk of natural disasters.

Our facilities are located in Northern California. If a fire or other natural disaster (such as an earthquake) disrupts our research or development efforts, our business, financial condition and operating results could be materially adversely affected. Some of our landlords maintain earthquake coverage for our facilities. Although we maintain personal property and business interruption coverage, we do not maintain earthquake coverage for personal property or resulting business interruption.

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RISKS RELATED TO OUR CAPITAL STRUCTURE AND FINANCIAL RESULTS

We have not been profitable, anticipate continuing losses and may never become profitable.

We had net losses of $50.2 million in 2003, $52.5 million in 2004 and $14.7 million in the three months ended March 31, 2005. As of March 31, 2005, we had an accumulated deficit of $270.7 million.

All of our product candidates are in various stages of product development, and some are still in research or in early development. None of them are approved for sale. The process of developing our drug products will require significant additional research and development, pre-clinical testing, clinical trials and regulatory approvals.

These activities, together with general administrative and other expenses, are expected to result in operating losses for the foreseeable future. To date, we have not generated any revenues from product sales. We do not expect to achieve significant product sales or royalty revenue for several years, and we may never do so. We expect to incur additional operating losses in the future, and these losses may increase significantly as we continue pre-clinical research and clinical trials, apply for regulatory approvals, develop our drug candidates, expand our operations and develop systems that support commercialization of our potential products. These losses, among other things, have caused and may cause our stockholders’ equity and working capital to decrease. We may not be successful in developing our drug candidates, obtaining regulatory approvals and commercializing our products, and our operations may not be profitable even if any of our drug candidates are commercialized. We may never generate profits and, as a result, the trading price of our common stock could decline.

Moreover, utilization of our net operating loss carryforwards and credits may be subject to an annual limitation due to the “change in ownership” provisions of the Internal Revenue Code of 1986 and similar state law provisions. It is possible that certain transactions that we have entered into, including our merger with Variagenics that occurred in January 2003, when considered in connection with other transactions, may result in a “change in ownership” for purposes of these provisions.

In January 2005, we entered into a lease agreement for 61,826 square feet of industrial space in San Carlos, California. In connection with our lease of this new facility, we are examining the potential to sublease or otherwise exit our existing facility at 985 Almanor Avenue in Sunnyvale, California, which is currently primarily being used for storage and for which we have a lease through May 30, 2011. In accordance with Statement of Financial Accounting Standards No. 146, “Accounting for Costs Associated with Exit or Disposal Activities,” if we sublease or otherwise exit this facility, we could incur a significant charge to our earnings based on the remaining lease rental expense for this facility, reduced by the estimated income from sublease rental, if any. As of March 31, 2005, the remaining lease rental expense for this facility was $34.7 million. Similarly, in accordance with Statement of Financial Accounting Standards No. 144, “Accounting for the Impairment or Disposal of Long-Lived Assets,” if we sublease or otherwise exit this facility, we could also incur a significant charge to our earnings for the impairment of leasehold improvements related to this facility, based on the difference between their carrying value and fair value at the time of the sublease or exit. As of March 31, 2005, this difference was measured to be $3.8 million.

We will need to raise additional capital, and such capital may be unavailable to us when we need it or not available on acceptable terms.

We will need to raise significant additional capital to finance the research and clinical development of our drug products. If future securities offerings are successful, they could dilute our current shareholders’ equity interests and reduce the market price of our common stock. Financing may be unavailable when we need it or may not be available on acceptable terms. The unavailability of financing may require us to delay, scale back or eliminate expenditures for our research, development and marketing activities necessary to commercialize our potential biopharmaceutical products. We may also be required to raise capital by granting rights to third parties to develop and market drug candidates that we would prefer to develop and market on our own, potentially reducing the ultimate value that we could realize from these drug candidates.

If we are unable to obtain additional financing when we need it, the capital markets may perceive that we are not able to raise the amount of financing we desire, or on the terms that we desire. This perception, if it occurs, may negatively affect the trading price of our common stock. If sufficient capital is not available, we may be forced to delay, reduce the scope of, eliminate or divest one or more of our research or development programs. Any such action could significantly harm our business, financial condition and results of operations.

Our future capital requirements and the adequacy of our currently available funds will depend on many factors, including, among others, the following:

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We may face fluctuations in operating results.

Our operating results may rise or fall significantly as a result of many factors, including:

Excluding our three clinical stage drug candidates, our potential products currently are in research or pre-clinical development, and revenues from the sales of any products resulting from this research and development may not occur for several years, if at all. A high percentage of our expenses are fixed costs such as lease obligations. As a result, we may experience fluctuations in our operating results from quarter to quarter and continue to generate losses. Quarterly comparisons of our financial results may not necessarily be meaningful, and investors should not rely upon such results as an indication of our future performance. In addition, investors may react adversely if our reported operating results are less favorable than in a prior period or are less favorable than those anticipated by investors or the financial community, which may result in a drop of our stock price.

Our stock price has historically been and is likely to remain highly volatile, and an investment in our stock could suffer a decline in value.

Stock prices and trading volumes for many biopharmaceutical companies fluctuate widely for a number of reasons, including factors which may be unrelated to their businesses or results of operations such as media coverage, legislative and regulatory measures and the activities of various interest groups or organizations. This market volatility, as well as general domestic or international economic, market and political conditions, could materially and adversely affect the market price of our common stock and the return on your investment.

Historically, our stock price has been extremely volatile. Between January 1, 2004 and December 31, 2004, the price ranged between a high of $16.50 per share and a low of $6.77 per share, and between January 1, 2005 and March 31, 2005 ranged between a high of $10.33 per share and a low of $6.35 per share. The significant market price fluctuations of our common stock are due to a variety of factors, including:

In addition, the stock market in general, and the market for biotechnology and other life science stocks in particular, has historically been subject to extreme price and volume fluctuations. This volatility has had a significant effect on the market prices of securities issued by many companies for reasons unrelated to the operating performance of these companies. In the past, following periods of volatility in the market price of a company’s securities, class action securities litigation has often been instituted against such a company. Any such litigation instigated against us could result in substantial costs and a diversion of management’s attention and resources, which could significantly harm our business, financial condition and operating results.

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Future sales of our common stock may depress the market price of our common stock.

Sales in the public market of substantial amounts of our common stock could depress prevailing market prices of our common stock. As of March 31, 2005, we had 42,014,464 shares of our common stock outstanding. All of these shares are freely transferable without restriction or further registration under the Securities Act of 1933, as amended, or the Securities Act, except for shares held by our directors, officers and greater than five percent stockholders and unregistered shares held by non-affiliates. As of March 31, 2005, our directors, officers and greater than five percent stockholders held 3,566,900 shares of our common stock, which are transferable pursuant to Rule 144 or in some cases Rule 145, each as promulgated under the Securities Act, or pursuant to effective registration statements. Although we do not believe that our directors, officers and greater than five percent stockholders have any present intentions to dispose of any shares of common stock owned by them, there can be no assurance that such intentions will not change in the future. The sale of these additional shares could depress the market price of our common stock.

We have granted registration rights in connection with the issuance of our securities to a number of our stockholders and warrant holders. In the aggregate, as of March 31, 2005, these registration rights covered approximately 1,516,792 shares of our common stock which were then outstanding or which may become outstanding upon the exercise of warrants that were then outstanding. If these registration rights, or similar registration rights that may apply to securities we may issue in the future, are exercised, it could result in additional sales of our common stock in the market, which may have an adverse effect on our stock price.

In addition, under registration statements on Form S-8 under the Securities Act, as of March 31, 2005 we have registered approximately 5,419,651 shares of our common stock for sale upon the exercise of outstanding options under our 2004 Equity Incentive Plan, 2002 Equity Incentive Plan, 1995 Stock Option Plan, Non-Employee Director Stock Option Plan, Scientific Advisory Board/Consultants Stock Option Plan, the Variagenics, Inc. Amended 1997 Employee Director and Consultant Stock Option Plan and stock option agreements entered into outside of any of our stock option plans. Included in the 5,419,651 shares, options to exercise 4,546,932 shares of our common stock were outstanding under the specified plans, and shares of our common stock acquired pursuant to these plans and agreements are available for sale in the open market. Additionally, included in the 5,419,651 shares, we have reserved approximately 872,719 shares of our common stock for issuance upon the exercise of outstanding options under stock option agreements entered into outside of any of our stock option plans. As of March 31, 2005, 3,844,507 shares of the total 6,936,443 shares related to these warrants and options were exercisable. In addition, as of March 31, 2005, we had 3,083,589 shares of our common stock remaining for future option grants under our 2004 Equity Incentive Plan. Under our Employee Stock Purchase Plan, we have approximately 47,242 shares of our common stock reserved for future issuance as of March 31, 2005. The existence of the currently outstanding warrants and options to purchase our common stock may negatively affect our ability to complete future equity financings at acceptable prices and on acceptable terms. The exercise of those options or warrants, and the prompt resale of shares of our common stock received, may result in downward pressure on the price of our common stock.

As of March 31, 2005, 832,779 shares of our common stock were issuable, at our option, to repay a note in the principal amount of $4.0 million held by Affymetrix. Affymetrix has the ability to declare all outstanding principal and interest under the note immediately due and payable in the event that our market capitalization is under $50.0 million and Affymetrix reasonably determines that the loan evidenced by the note is impaired, and we have an obligation to prepay amounts owing under the note to the extent that the amounts outstanding exceed 10% of our market capitalization. Moreover, we have registered for resale a portion of these shares on a registration statement that has been declared effective by the Securities and Exchange Commission. If we decide to repay this note with our common stock, whether pursuant to acceleration of the note or otherwise, the resale of shares of our common stock by Affymetrix may also result in significant downward pressure on the price of our common stock. In addition, as of March 31, 2005, 1,248,175 shares of common stock were issuable, upon mutual agreement, to convert the promissory note that we have issued under a line of credit with George Rathmann. If we agree to repay this note with our common stock, whether pursuant to acceleration of the note or otherwise, the resale of shares of our common stock received by George Rathmann may also result in significant downward pressure on the price of our common stock.

We will need to raise significant additional capital to finance the research and clinical development of our drug products. If future securities offerings are successful, they could dilute our current shareholders’ equity interests and reduce the market price of our common stock.

We do not intend to pay cash dividends on our common stock in the foreseeable future.

We do not anticipate paying cash dividends on our common stock in the foreseeable future. Any payment of cash dividends will depend upon our financial condition, results of operations, capital requirements and other factors and will be at the discretion of the Board of Directors. Under our August 31, 2004 Loan and Security Agreement with Silicon Valley Bank, we cannot pay dividends without Silicon Valley Bank’s prior written consent, except for dividends paid in shares of our capital stock. Furthermore, we may incur additional indebtedness that may severely restrict or prohibit the payment of dividends.

We have implemented anti-takeover provisions that could discourage, prevent or delay a takeover, even if the acquisition would be beneficial to our stockholders.

The existence of our stockholder rights plan and provisions of our 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 benefit our stockholders. These provisions:

Specifically, our certificate of incorporation provides that all stockholder action must be effected at a duly called meeting and not by a consent in writing. The by-laws provide, however, that our stockholders may call a special meeting of stockholders only upon a request of stockholders owning at least 50% of our common stock. These provisions of our certificate of incorporation and our by-laws could discourage potential acquisition proposals and could delay or prevent a change in control. We designed these provisions to reduce our vulnerability to unsolicited acquisition proposals and to discourage certain tactics that may be used in proxy fights. These provisions, however, could also have the effect of discouraging others from making tender offers for our shares. As a consequence, they also may inhibit fluctuations in the market price of our shares that could result from actual or rumored takeover attempts. Such provisions also may have the effect of preventing changes in our management.

We are permitted to issue shares of our preferred stock without stockholder approval upon such terms as our board of directors determines. Therefore, the rights of the holders of our common stock are subject to, and may be adversely affected by, the rights of the holders of our preferred stock that may be issued in the future. In addition, the issuance of preferred stock could have a dilutive effect on the holdings of our current stockholders.

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On June 5, 1998, our board of directors adopted a rights plan and declared a dividend with respect to each share of our common stock then outstanding. This dividend took the form of a right, which entitles the holders to purchase one one-thousandth of a share of our Series A junior participating preferred stock at a purchase price that is subject to adjustment from time to time. These rights have also been issued in connection with each share of our common stock issued after June 15, 1998. The rights are exercisable only if a person or entity or affiliated group of persons or entities acquires, or has announced its intention to acquire, 15% (27.5% in the case of certain approved stockholders) or more of our outstanding common stock. The adoption of the rights plan makes it more difficult for a third party to acquire control of us without the approval of our board of directors. This rights agreement was amended on March 19, 2004, to reflect our reincorporation under Delaware law.

We are subject to the Delaware anti-takeover laws regulating corporate takeovers. These anti-takeover laws prevent a Delaware corporation from engaging in a merger or sale of more than 10 percent of its assets with any stockholder, including all affiliates and associates of the stockholder, who owns 15 percent or more of the corporation’s outstanding voting stock, for three years following the date that the stockholder acquired 15 percent or more of the corporation’s stock unless:

The provisions of our governing documents, stockholder rights plan and current Delaware law may, collectively:

Recent accounting pronouncements may impact our future financial position and results of operations

There may be potential new accounting pronouncements or regulatory rulings, which may have an impact on our future financial position and results of operations. On December 16, 2004, the Financial Accounting Standards Board (FASB) issued Statement of Financial Accounting Standards No. 123 (revised 2004), “Share-Based Payment” (SFAS 123(R)), an amendment of Statements of Financial Accounting Standards No. 123 and 95, that addresses the accounting for share-based awards to employees. The standard requires companies to recognize as an expense the fair value of stock options and other stock-based compensation to employees. The statement eliminates the ability to account for share-based compensation transactions using APB Opinion No. 25, “Accounting for Stock Issued to Employees,” (APB 25), and generally requires instead that such transactions be accounted for using a fair value-based method, such as Black-Scholes, to fairly value stock options and recognize that value as an expense. The standard will be effective for public companies as of the beginning of the first fiscal year after June 15, 2005. We currently account for our stock-based compensation plans in accordance with APB 25. We will be required to implement SFAS 123(R) effective from the beginning of our 2006 fiscal year, and we expect that its adoption will have a material adverse impact to our consolidated financial statements.

We have adopted an Executive Change in Control and Severance Benefit Plan that could discourage, prevent or delay a takeover, even if the acquisition would be beneficial to our stockholders.

On December 14, 2004, our Board of Directors approved an “Executive Change in Control and Severance Benefit Plan” for our executive officers and other eligible employees. The purpose of the plan is to provide for the payment of severance benefits and/or change in control benefits to certain of our eligible employees, and the plan supersedes and replaces any change in control and/or severance plans adopted by us previously. All of our executive employees at the level of Vice President or above have been designated as participants in the plan and our Board of Directors may designate other eligible individuals as participants. The plan provides that, upon a change in control of the company as defined under the plan, all Nuvelo stock options and stock awards held by a plan participant will become fully vested. Such shares held by a plan participant will also become fully vested if the participant is terminated without cause or constructively terminated within one month preceding our change in control. If a participant is terminated without cause or constructively terminated one month before or one year after our change in control, he or she will also be entitled to certain cash severance and continued medical benefits. The change in control and severance benefits for certain of our employees provided for under this plan could make it more difficult and expensive, or less desirable, for a third party to acquire us, even if doing so would benefit our stockholders.

RISKS RELATED TO INTELLECTUAL PROPERTY AND OTHER LEGAL MATTERS

The commercial success of our products will be dependent upon our ability to protect the intellectual property rights associated with our products and drug candidates.

Our competitive success will depend in part on our ability to obtain and maintain patent protection for our inventions, technologies and discoveries, including intellectual property that we license. The patent positions of biotechnology companies involve complex legal and factual questions, and we cannot assure you that our patents and licenses will successfully preclude others from using our technology. We could incur substantial costs in seeking enforcement of our proprietary rights against infringement. In addition, to obtain a patent on a novel gene or the protein it encodes, we need to identify a utility for the novel gene or the encoded protein we seek to protect under patent law. Identifying a utility may require significant research and development with respect to which we may incur a substantial expense and invest a significant amount of time.

We currently have, or have in-licensed, issued patents and pending patent applications that cover portions of our in-licensed clinical products. ARC183 is covered both by a U.S. patent specifically claiming ARC183 and by U.S. patents covering aptamers generically. However, there are no equivalent international applications pending specifically claiming ARC183. International patent applications generically covering aptamers are pending but we cannot assure you that such patents will issue. We licensed the worldwide rights for all indications of rNAPc2 and all of the rNAPc molecules owned by Dendreon in February 2004. The United States government may claim a non-exclusive right to use rNAPc2 with respect to the treatment of hemorrhagic fever. We also currently have patents that cover some of our technological discoveries and patent applications that we expect to protect some of our gene, protein and technological discoveries. We will continue to apply for patents for our discoveries. We cannot assure you that any of our applications will issue as patents, or that any patent issued or licensed to us will not be challenged, invalidated, circumvented or held unenforceable by way of an interference proceeding or litigation.

The timing of the grant of a patent cannot be predicted. Patent applications describing and seeking patent protection of methods, compositions, or processes relating to

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proprietary inventions involving human therapeutics could require us to generate data, which may involve substantial costs. Our pending patent applications may lack priority over others’ applications or may not result in the issuance of patents. Even if issued, our patents may not be sufficiently broad to provide protection against competitors with similar technologies and may be challenged, invalidated or circumvented.

In addition to patents, we rely on a combination of trade secrets, copyright and trademark laws, nondisclosure agreements, licenses and other contractual provisions and technical measures to maintain and develop our competitive position with respect to intellectual property. Nevertheless, these measures may not be adequate to safeguard the technology underlying our products. For example, employees, consultants and others who participate in the development of our products may breach their agreements with us regarding our intellectual property and we may not have adequate remedies for the breach. Our trade secrets could become known through other unforeseen means. We depend on our collaborators and other third parties that license intellectual property to us to protect our licensed intellectual property. These collaborators and other third parties could fail to take a necessary step to protect our licensed intellectual property, which could seriously harm our intellectual property position.

We also may not be able to effectively protect our intellectual property rights in some foreign countries, as many countries do not offer the same level of legal protection for intellectual property as the United States. Furthermore, certain of the patent applications describing our proprietary methods are filed only in the United States. Even where we have filed our patent applications internationally, for some cases and in certain countries, we have chosen not to maintain foreign patent protection by opting not to enter national phase or opting not to pay maintenance annuities.

Notwithstanding our efforts to protect our intellectual property, our competitors may independently develop similar or alternative technologies or products that are equal or superior to our technology. Our competitors may also develop similar products without infringing on any of our intellectual property rights or design around our proprietary technologies.

If our products infringe on the intellectual property rights of others, we could face costly litigation, which could cause us to pay substantial damages and limit our ability to sell some or all of our products.

Extensive litigation regarding patents and other intellectual property rights has been common in the biopharmaceutical industry. Litigation may be necessary to assert infringement claims, enforce patent rights, protect trade secrets or know-how and determine the enforceability, scope and validity of certain proprietary rights. The defense and prosecution of intellectual property lawsuits, United States Patent and Trademark Office interference proceedings, and related legal and administrative proceedings in the United States and internationally involve complex legal and factual questions. As a result, such proceedings are costly and time-consuming to pursue and their outcome is uncertain.

Regardless of merit or outcome, our involvement in any litigation, interference or other administrative proceedings could cause us to incur substantial expense and could significantly divert the efforts of our technical and management personnel. An adverse determination may subject us to the loss of our proprietary position or to significant liabilities, or require us to seek licenses that may include substantial cost and ongoing royalties. Licenses may not be available from third parties, or may not be obtainable on satisfactory terms. An adverse determination or a failure to obtain necessary licenses may restrict or prevent us from manufacturing and selling our products, if any. These outcomes could materially harm our business, financial condition and results of operations.

Our market success depends in part on us neither infringing valid, enforceable patents or proprietary rights of third parties, nor breaching any licenses that may relate to our technologies and products. We are aware of third-party patents that may relate to our technology. We may be required to obtain licenses to patents or other proprietary rights of others in order to conduct research, development, or commercialization of some or all of our programs. We plan to seek licenses, as we deem appropriate, but it is possible that we may infringe upon these patents or proprietary rights of third parties. If we do not obtain these licenses, we may encounter delays in product market introductions, incur substantial costs while we attempt to design around existing patents or not be able to develop, manufacture or sell products. In response, third parties may assert infringement or other intellectual property claims against us. We may consequently be subjected to substantial damages for past infringement or be required to modify our products if it is ultimately determined that our products infringe a third party’s proprietary rights. Further, we may be prohibited from selling our products before we obtain a license, which, if available at all, may require us to pay substantial royalties, which could adversely impact our product costs and have an impact on our business. Further, if we do obtain these licenses, the agreed terms may necessitate reevaluation of the potential commercialization of any one of our programs. Failing to obtain a license could result in litigation. Even if these claims are without merit, defending a lawsuit takes significant time, may be expensive and may divert management attention from other business concerns. Any public announcements related to litigation or interference proceedings initiated or threatened against us could cause our stock price to decline.

We face product liability exposure and potential unavailability of insurance.

We risk financial exposure to product liability claims in the event that the use of products developed by us, or our collaboration partners, if any, result in personal injury.

We may experience losses due to product liability claims in the future. We have obtained limited product liability insurance coverage. Such coverage, however, may not be adequate or may not continue to be available to us in sufficient amounts or at an acceptable cost, or at all. We may not be able to obtain commercially reasonable product liability insurance for any product approved for marketing. A product liability claim or other claim, product recalls, as well as any claims for uninsured liabilities or in excess of insured liabilities, may significantly harm our business, financial condition and results of operations.

We use hazardous materials, chemicals and patient samples in our business and any disputes relating to improper handling, storage or disposal of these materials could be time consuming and costly.

Our research and development and production activities involve the controlled use of hazardous or radioactive materials, chemicals, including oxidizing and reducing reagents, patient tissue and blood samples. We, our collaborators and service providers, are subject to federal, state and local laws and regulations governing the use, storage, handling and disposal of these materials and certain waste products. We could be liable for accidental contamination or discharge or any resultant injury from hazardous materials, and conveyance, processing, and storage of and data on patient samples. If we, or our collaborators or service providers, fail to comply with applicable laws or regulations, we could be required to pay penalties or be held liable for any damages that result and this liability could exceed our financial resources. Further, future changes to environmental health and safety laws could cause us to incur additional expense or restrict our operations. In addition, our collaborators and service providers may be working with these types of hazardous materials, including viruses and hazardous chemicals, in connection with our collaborations. In the event of a lawsuit or investigation, we could be held responsible for any injury caused to persons or property by exposure to, or release of, patient samples that may contain viruses and hazardous materials. The cost of this liability could exceed our resources.

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Variagenics has been named as a defendant in a class action suit and defending this litigation could hurt our business.

Variagenics has been named as a defendant in a securities class action lawsuit alleging the failure to disclose additional and excessive commissions purportedly solicited by and paid to underwriters who are also named defendants in the lawsuit. Plaintiffs in the suit allege that underwriters took these commissions and in exchange allocated shares of Variagenics’ stock to their preferred customers through alleged agreements with these preferred customers that tied the allocation of initial public offering shares to agreements by the customers to make additional aftermarket purchases at pre-determined prices. As a result of our merger with Variagenics, we are obligated to continue to defend against this litigation. Currently we are in the process of approving a settlement by and between the issuers that are defendants in the lawsuit, the insurers of those issuers, and the plaintiffs. We believe that any loss or settlement amount will not be material to our financial position or results of operation, and that any settlement payment and attorneys’ fees accrued with respect to the suit will be paid by our insurance provider. However, we cannot assure you that this will be the case until a final settlement is executed. Failure to finalize a settlement could require us to pay substantial damages.

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ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Interest Rate Risk

We place our investments with high quality issuers and, by policy, limit the amount of credit exposure with any one issuer. We do not use derivative financial instruments in our investment portfolio. We are averse to principal loss, and strive to ensure the safety and preservation of our invested funds by limiting default, market and reinvestment risk.

Changes in interest rates do not affect interest expense on our outstanding bank loan, note payable and capital leases, as they bear fixed rates of interest.

We have exposure to changes in interest rates on our revolving bank line of credit with Silicon Valley Bank, which bears interest at their prime rate. No draw-downs have been made on this line of credit to date.

We have exposure to changes in interest rates on our line of credit with our chairman, which bears interest at the prime rate plus 1%. Our interest rate exposure is mitigated by our ability to repay amounts outstanding under the line of credit with our common stock.

A hypothetical 10% change in market interest rates is not expected to have a material effect on our near-term financial condition or results of operations.

There were no significant changes in our market risk exposures through the first quarter of 2005 since our Form 10-K filing on March 16, 2005.

Foreign Exchange Risk

We have no investments denominated in foreign country currencies and therefore our investments are not subject to foreign currency exchange risk. However, at each quarter end we may have liabilities for costs incurred by overseas providers that are denominated in foreign currencies. An increase or decrease in the related exchange rates prior to payment may affect our operating results accordingly. Due to the size of these liabilities and the relatively short time before they are paid, we currently do not use derivative financial instruments to mitigate this exposure, although we will continue to review this issue in the future.

ITEM 4. CONTROLS AND PROCEDURES

We maintain disclosure controls and procedures that are designed to ensure that information required to be disclosed in the reports that we file under the Securities Exchange Act of 1934 is recorded, processed, summarized and reported within the time periods specified in the rules and forms of the SEC, and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosures. In designing and evaluating the disclosure controls and procedures, management recognized that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives, and management necessarily was required to apply its judgment in evaluating the cost-benefit relationship of possible controls and procedures.

As required by Rule 13a-15(b) of the Securities Exchange Act of 1934, we carried out an evaluation, under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures as of the end of the quarter covered by this report. Based on the foregoing, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were effective at the reasonable assurance level.

We continue to review and improve the design and effectiveness of our internal controls over financial reporting in order to remain in compliance with Section 404 of the Sarbanes-Oxley Act of 2002. There has been no change in our internal controls during our most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, our internal controls over financial reporting.

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PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDING

On or about December 6, 2001, Variagenics was sued in a complaint filed in the United States District Court for the Southern District of New York naming it and certain of its officers and underwriters as defendants. The complaint purportedly is filed on behalf of persons purchasing the Company’s stock between July 21, 2000 and December 6, 2000, and alleges violations of Sections 11, 12(a)(2) and 15 of the Securities Act of 1933, as amended and Section 10(b) of the Securities Exchange Act of 1934, as amended, and Rule 10b-5 promulgated thereunder.

The complaint alleges that, in connection with Variagenics’ July 21, 2000 initial public offering, or IPO, the defendants failed to disclose additional and excessive commissions purportedly solicited by and paid to the underwriter defendants in exchange for allocating shares of Variagenics’ stock to preferred customers and alleged agreements among the underwriter defendants and preferred customers tying the allocation of IPO shares to agreements to make additional aftermarket purchases at predetermined prices. Plaintiffs claim that the failure to disclose these alleged arrangements made Variagenics’ registration statement on Form S-1 filed with the SEC in July 2000 and the prospectus, a part of the registration statement, materially false and misleading. Plaintiffs seek unspecified damages. On or about April 19, 2002, an amended complaint was filed which makes essentially the same allegations. On or about July 15, 2002, Variagenics and the individuals filed a motion to dismiss. We are involved in this litigation as a result of our merger with Variagenics in January 2003.

On July 16, 2003, Nuvelo’s Board of Directors approved a settlement proposal initiated by the plaintiffs. The final terms of the settlement are still being negotiated. It is possible that the parties may not reach agreement on the final settlement documents or that the Federal District Court may not approve the settlement in whole or part. We believe we have meritorious defenses and intend to defend this action vigorously; however, we could be forced to incur material expenses in the litigation if the parties do not reach agreement of the final settlement documents, and in the event there is an adverse outcome, our business could be harmed.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

Not applicable.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

Not applicable.

ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

Not applicable.

ITEM 5. OTHER INFORMATION

Not applicable.

ITEM 6. EXHIBITS

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SIGNATURE

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

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EXHIBIT INDEX

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