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1 DNA Way, South San Francisco, California  94080-4990
(Address of principal executive offices and Zip Code)

(650) 225-1000
(Registrant's telephone number, including area code)

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

Indicate 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.

In this report, "Genentech," "we," "us" and "our" refer to Genentech, Inc. "Common Stock" refers to Genentech's common stock, par value $0.02 per share, "Special Common Stock" refers to Genentech's callable putable common stock, par value $0.02 per share, all of which was redeemed by Roche Holdings, Inc. on June 30, 1999.

We own or have rights to various copyrights, trademarks and trade names used in our business including the following: Activase® (alteplase, recombinant) tissue-plasminogen activator; Avastin™ (bevacizumab) anti-VEGF antibody; Cathflo® Activase® (alteplase for catheter clearance); Herceptin® (trastuzumab) anti-HER2 antibody; Lucentis™ (ranibizumab, rhuFab V2) anti-VEGF antibody fragment; Nutropin® (somatropin (rDNA origin) for injection) growth hormone; Nutropin AQ® and Nutropin AQ Pen® (somatropin (rDNA origin) for injection) liquid formulation growth hormone; Nutropin Depot® (somatropin (rDNA origin) for injectable suspension) encapsulated sustained-release growth hormone; Omnitarg™ (pertuzumab) HER dimerization inhibitor; Protropin® (somatrem for injection) growth hormone; Pulmozyme® (dornase alfa, recombinant) inhalation solution; Raptiva™ (efalizumab, formerly Xanelim™) anti-CD11a antibody; and TNKase™ (tenecteplase) single-bolus thrombolytic agent. Rituxan® (rituximab) anti-CD20 antibody is a registered trademark of Biogen Idec Inc.; Tarceva™ (erlotinib HC1) is a trademark of OSI Pharmaceuticals, Inc.; and Xolair® (omalizumab) anti-IgE antibody is a trademark of Novartis AG. This report also includes other trademarks, service marks and trade names of other companies.

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We prepared the condensed consolidated financial statements following the requirements of the Securities and Exchange Commission (or SEC) for interim reporting. As permitted under those rules, certain footnotes or other financial information that are normally required by accounting principles generally accepted in the United States of America (or GAAP) can be condensed or omitted. In the opinion of management, the financial statements include all normal and recurring adjustments that are considered necessary for the fair presentation of our financial position and operating results. Certain reclassifications have been made to prior year amounts to conform with current period presentation.

Revenues, expenses, assets and liabilities can vary during each quarter of the year. Therefore, the results and trends in these interim financial statements may not be the same as those for the full year. The information included in this quarterly report on Form 10-Q should be read in conjunction with the consolidated financial statements and accompanying notes included in our Annual Report on Form 10-K for the year ended December 31, 2003.

The condensed consolidated financial statements include the accounts of Genentech and all subsidiaries. Genentech also consolidated a variable interest entity in which Genentech is the primary beneficiary pursuant to Financial Accounting Standards Board (or FASB) Interpretation No. 46R (or FIN 46R), a revision to Interpretation 46, "Consolidation of Variable Interest Entities," an interpretation of Accounting Research Bulletin No. 51, and recorded the noncontrolling interest in the condensed consolidated balance sheet. Material intercompany accounts and transactions have been eliminated.

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

We have elected to continue to follow the intrinsic value method of accounting for stock-based compensation as prescribed by Accounting Principles Board Opinion No. 25 (or APB 25), "Accounting for Stock Issued to Employees." We apply the disclosure provisions of Statement of Financial Accounting Standards No. 123 (or FAS 123), "Accounting for Stock-based Compensation," as amended by FAS 148, "Accounting for Stock-based Compensation - Transition and Disclosure" (or FAS 148) as if the fair value-based method had been applied in measuring compensation expense. Under APB 25, we do not recognize compensation expense unless the exercise price of our employee stock options is less than the market price of the underlying stock on the date of grant. We grant all of our options at the fair market value of the underlying stock on the date of grant. Consequently, we have not recorded such expense in the periods presented.

We currently grant options under a stock option plan that allows for the granting of non-qualified stock options, incentive stock options and stock purchase rights to employees, directors and consultants of Genentech. Incentive stock options may only be granted to employees under this plan. Generally, non-qualified options and incentive options have a maximum term of 10 years. In general, options vest in increments over four years from the date of

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grant, although we may grant options with different vesting terms from time to time. No stock purchase rights or incentive stock options have been granted under our current plan to date.

We have an employee stock plan that allows eligible employees to purchase common stock at 85% of the lower of the fair market value on the grant date or the fair market value on the purchase date. Purchases are limited to 15% of each employee's eligible compensation and subject to certain Internal Revenue Service restrictions. All full-time employees of Genentech are eligible to participate in this plan.

The following information regarding net income and earnings per share has been determined as if we had accounted for our employee stock options and employee stock plan under the fair value method prescribed by FAS 123 as amended by FAS 148. The resulting effect on net income and earnings per share pursuant to FAS 123 is not likely to be representative of the effects in future periods, due to subsequent additional option grants and periods of vesting. The fair value of options was estimated at the date of grant using a Black-Scholes option valuation model with the following weighted-average assumptions:

The Black-Scholes option valuation model was developed for use in estimating the fair value of traded options, which have no vesting restrictions and are fully transferable. Option valuation models require the input of highly subjective assumptions including the expected stock price volatility. Because our employee stock options have characteristics significantly different from those of traded options and changes in the subjective input assumptions can materially affect the fair value estimate, in management's opinion, the existing models do not provide a reliable single measure of the fair value of our employee stock options, thus these calculations may not accurately value such options.

For purposes of disclosures pursuant to FAS 123 as amended by FAS 148, the estimated fair value of options is amortized to expense ratably over the options' vesting period.

The following table illustrates the effect on reported net income and earnings per share as if we had applied the fair value recognition provisions of FAS 123 to stock-based employee compensation (in thousands, except per share amounts):

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On March 31, 2004, the FASB issued an Exposure Draft (ED), "Share-Based Payment - An Amendment of FASB Statements No. 123 and 95." The proposed Statement addresses the accounting for transactions in which an enterprise receives employee services in exchange for (a) equity instruments of the enterprise or (b) liabilities that are based on the fair value of the enterprise's equity instruments or that may be settled by the issuance of such equity instruments. The proposed Statement would eliminate the ability to account for share-based compensation transactions using APB 25, and generally would require instead that such transactions be accounted for using a fair-value based method. As proposed, companies would be required to recognize an expense for compensation cost related to share-based payment arrangements including stock options and employee stock purchase plans. As proposed, the new rules would be applied on a modified prospective basis as defined in the ED, and would be effective for public companies for fiscal years beginning after December 15, 2004. We are currently evaluating option valuation methodologies and assumptions in light of the evolving accounting standards related to employee stock options. Current estimates of option values using the Black Scholes method (as shown above) may not be indicative of results from valuation methodologies ultimately adopted in the final rules.

We lease various real properties under operating leases. Three of our operating leases are commonly referred to as "synthetic leases." Under FIN 46R, each synthetic lease is evaluated to determine if it qualifies as a variable interest entity (or VIE) and whether Genentech is the primary beneficiary under which it would be required to consolidate the VIE.

The most significant of our synthetic leases relates to our manufacturing facility located in Vacaville, California. Under FIN 46R, we determined that the entity from which we lease the Vacaville facility qualified as a VIE and that we are the primary beneficiary of this VIE as we absorb the majority of the entity's expected losses. Upon adoption of the provisions of FIN 46R on July 1, 2003, we consolidated the entity.

Our two remaining leases were entered into with BNP Paribas Leasing Corporation (or BNP), who leases directly to us various buildings that we occupy in South San Francisco, California. Under one of these leases, we are required to maintain cash collateral of $56.6 million, which we have included in our condensed consolidated balance sheets as restricted cash and other long-term assets. We have evaluated our accounting for these leases under the provisions of FIN 46R, and we determined that, as of July 1, 2003 and through March 31, 2004, we are not required to consolidate either the leasing entity or the specific assets that we lease under the BNP leases.

Future minimum lease payments were computed based on December 31, 2003 market-based interest rates, which are subject to fluctuations. The minimum payments under all leases, exclusive of the residual value guarantees, executory costs and sublease income, at December 31, 2003, are as follows (in millions):

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The following summarizes the approximate initial fair values of the facilities at the inception of the related leases, lease terms and residual value guarantee amounts for each of our synthetic leases (in millions):

We believe that there have been no impairments in the fair value or use of the properties that we lease under synthetic leases wherein we would be required to pay amounts under any of the residual value guarantees. We will continue to assess the fair values of the underlying properties and the use of the properties for impairment at least annually.

The maximum exposure to loss on our synthetic leases includes (i) residual value guarantee payments as shown above, (ii) certain tax indemnifications in the event the third-parties are obligated for certain federal, state or local taxes as a result of their participation in the transaction, and (iii) indemnification for various losses, costs and expenses incurred by the third-party participants as a result of their ownership of the leased property or participation in the transaction, and as a result of the environmental condition of the property. The additional taxes, losses and expenses as described in (ii) and (iii) are contingent upon the existence of certain conditions and, therefore, would not be quantifiable at this time. However, we do not expect these additional taxes, losses and expenses to be material. In the case of South San Francisco lease 1, we have pledged cash collateral of $56.6 million as a source of payment for Genentech's obligation for the residual value guarantee payments and other amounts we owe under the lease.

In August 2002, we entered into an agreement with Serono S.A., which, in addition to granting Serono marketing rights in specific areas of the world, includes an arrangement to collaborate on co-developing additional indications of Raptiva and to share certain global development costs. We also have a supply agreement with Serono, under which we may have a loss exposure up to a maximum of $10.0 million.

We are a party to various legal proceedings, including patent infringement litigation relating to our antibody products, and licensing and contract disputes, and other matters.

We and the City of Hope National Medical Center (or COH) are parties to a 1976 agreement relating to work conducted by two COH employees, Arthur Riggs and Keiichi Itakura, and patents that resulted from that work, which are referred to as the "Riggs/Itakura Patents." Since that time, Genentech has entered into license agreements with various companies to make, use and sell the products covered by the Riggs/Itakura Patents. On August 13, 1999, the COH filed a complaint against us in the Superior Court in Los Angeles County, California, alleging that we owe royalties to the COH in connection with these license agreements, as well as product license agreements that involve the grant of licenses under the Riggs/Itakura Patents. The first trial of this suit began on August 28, 2001. On October 24, 2001, the jury hearing the lawsuit announced that it was unable to reach a verdict and on that basis the Court declared a mistrial. COH requested a retrial, and the retrial began on March 20, 2002. On June 10, 2002, the jury voted to award the COH approximately $300 million in compensatory damages. On June 24, 2002, the jury voted to award the COH an additional $200 million in punitive damages. Such amounts were accrued as an expense in the second quarter of 2002 and were included in other long-term liabilities in the condensed consolidated balance sheets at March 31, 2004 and December 31, 2003. Genentech filed a notice of appeal of the verdict and damages awards with the California Court of Appeal. The appeal process is ongoing. The amount of cash paid, if any, in connection with the COH matter will depend on the outcome of the appeal.

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On June 7, 2000, Chiron Corporation filed a patent infringement suit against us in the U.S. District Court in the Eastern District of California (Sacramento), alleging that the manufacture, use, sale and offer for sale of our Herceptin antibody product infringes Chiron's U.S. Patent No. 6,054,561. This patent was granted on April 25, 2000, and will expire on June 28, 2005, and it relates to certain antibodies that bind to breast cancer cells and/or other cells. Chiron is seeking compensatory damages for the alleged infringement, additional damages (e.g., for willful infringement), and attorneys' fees and costs. On April 22, 2002, the Court issued its decision ("Markman Order") construing certain aspects of the patent claims that are in dispute. On June 25, 2002, the Court issued several decisions regarding summary judgment motions that previously had been filed by Chiron and us. In those decisions, the Court ruled as a matter of law that Herceptin infringes claims 1 to 25 of Chiron's patent, and also ruled as a matter of law in favor of Chiron on some but not all of Genentech's defenses and counterclaims regarding the alleged invalidity and/or unenforceability of the patent. The trial of this suit began on August 6, 2002. Following the first phase of the trial, which related to Genentech's remaining defenses and counterclaims regarding the alleged invalidity of the patent, the jury unanimously found that claims 1 to 25 of Chiron's patent were invalid, and on that basis the Court entered judgment in favor of Genentech. Chiron filed a notice of appeal with the U.S. Court of Appeals for the Federal Circuit ("Court of Appeals"), and Genentech filed a notice of cross-appeal. On April 6, 2004, we announced that a three-judge panel of the Court of Appeals unanimously affirmed the 2002 judgment of the U.S. District Court that found in favor of Genentech that all claims of Chiron's patent asserted against Genentech are invalid. On or about April 15, 2004, Chiron filed a Petition for Rehearing with the Court of Appeals seeking further review and reconsideration of that Court's decision. The Court of Appeals has not yet given its decision on the Petition.

On August 12, 2002, the U.S. Patent and Trademark Office (or Patent Office) declared an interference between the Chiron patent involved in the above-mentioned lawsuit (U.S. Patent No. 6,054,561) and a patent application exclusively licensed by Genentech from a university relating to anti-HER2 antibodies. An interference proceeding is declared to decide who first made a particular invention where two or more parties claim the same invention, whether the parties' claims are patentable, and consequently who is or is not entitled to a patent on the invention. In declaring this interference, the Patent Office has determined that there is a substantial question as to whether the inventors of the Chiron patent were first to invent and are entitled to this patent. If the Patent Office were to decide that the inventors of the university's patent application were first to invent and that their claims are patentable, a new patent would be issued to the university and the Chiron patent would be revoked. On October 24, 2002, the Patent Office redeclared the interference to include, in addition to the above-referenced Chiron patent and university patent application, a number of patents and patent applications owned by either Chiron or Genentech, including Chiron's U.S. Patent No. 4,753,894 that is also at issue in the separate patent infringement lawsuit described below. The interference proceeding is ongoing and therefore the outcome of this matter cannot be determined at this time.

On March 13, 2001, Chiron filed another patent infringement lawsuit against us in the U.S. District Court in the Eastern District of California, alleging that the manufacture, use, sale and/or offer for sale of our Herceptin antibody product infringes Chiron's U.S. Patent No. 4,753,894. Chiron is seeking compensatory damages for the alleged infringement, additional damages, and attorneys' fees and costs. Genentech filed a motion to dismiss this second lawsuit, which was denied. On November 1, 2002, the parties filed a proposed stipulation to stay all proceedings in this lawsuit until (1) the interference involving U.S. Patent No. 4,753,894 is resolved or (2) two years from entry of the proposed stipulation, whichever is sooner. On or about November 13, 2002, the Court entered the stipulation, staying the proceedings as requested by the parties. This lawsuit is separate from and in addition to the Chiron suit mentioned above.

We and Tanox Biosystems, Inc. (or Tanox) are parties to a July 1996 Settlement and Cross-Licensing Agreement relating to the development and manufacture of certain antibody products directed towards immunoglobin E, including Xolair and Hu-901. On February 20, 2002, Tanox filed an amended demand in an ongoing arbitration proceeding between Genentech and Tanox that is being conducted by the American Arbitration Association in San Francisco. In its amended demand, Tanox has claimed breach of the July 1996 Agreement, conversion, tortious interference, unjust enrichment, and unfair competition by Genentech, and requests injunctive relief as well as monetary damages "many times in excess of $100,000,000." On March 14, 2002, Genentech denied all of Tanox's claims, and counterclaimed for breach of contract, theft of trade secrets, misappropriation, breach of confidence,

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interference with contract, and interference with economic expectancies by Tanox. Genentech requested injunctive relief and monetary damages. On October 16, 2002, Tanox announced that in a dispute between it and Novartis, an arbitration panel ruled that Tanox is not entitled to develop independently the Hu-901 antibody product. The Novartis/Tanox panel also ruled that Tanox is entitled to receive certain know-how from Novartis. Tanox contends in its dispute against Genentech that it is entitled to similar information from Genentech. The effect of the October 16 ruling from the Novartis/Tanox arbitration, if any, on Tanox's claims against Genentech cannot be determined since the arbitrators in the Tanox/Genentech proceedings have not yet resolved it. As a general matter, the claims are divided into two categories: (1) compensation for lost rights under agreements with Genentech and Novartis, and (2) additional royalties on future sales. On February 25, 2004, the parties settled and agreed to dismiss with prejudice all claims from the arbitration that began on January 13, 2003. On February 26, 2004, we announced that we, Novartis Pharma AG and Tanox, Inc. have settled all litigation among us and finalized the detailed terms of our three-party collaboration, begun in 1996, to develop, commercialize and manufacture certain anti-IgE antibodies including Xolair® (Omalizumab) and TNX-901. Genentech and Novartis each reimbursed Tanox $3.3 million in an upfront payment; Tanox will relinquish any rights to manufacture Xolair and will receive payments tied to certain quantities of Xolair produced by Genentech and/or Novartis; and Tanox will benefit from an accelerated forgiveness of a loan from Novartis to finance the construction of its biologics manufacturing plant in the mid-1990s. As in the original agreement, Genentech and Novartis share U.S. marketing rights for all collaboration products, while Novartis has marketing rights outside the United States. The existing royalty and profit-sharing percentages will remain unchanged. Committees with representatives from all three companies have been established to cooperatively oversee further development and commercialization of Xolair, and possibly other collaboration products.

On April 11, 2003, MedImmune, Inc. filed a lawsuit against Genentech, City of Hope National Medical Center (or COH), and Celltech R & D Ltd. in the U.S. District Court for the Central District of California (Los Angeles). The lawsuit relates to U.S. Patent No. 6,331,415 ("the '415 patent") that is co-owned by Genentech and COH and under which MedImmune and other companies have been licensed and are paying royalties to Genentech. The lawsuit includes claims for violation of antitrust, patent, and unfair competition laws. MedImmune is seeking to have the '415 patent declared invalid and/or unenforceable, a determination that MedImmune does not owe royalties under the '415 patent on sales of its Synagis® antibody product, an injunction to prevent Genentech from enforcing the '415 patent, an award of actual and exemplary damages, and other relief. Genentech intends to vigorously defend itself against all of the allegations and claims in this lawsuit. On January 14, 2004 (amending a December 23, 2003 Order), the U.S. District Court granted summary judgment in Genentech's favor on all of MedImmune's antitrust and unfair competition claims. MedImmune sought to amend its complaint to reallege certain claims for antitrust and unfair competition. On February 19, 2004, the Court denied this motion in its entirety and final judgment was entered in favor of Genentech and Celltech and against MedImmune on March 15, 2004 on all antitrust and unfair competition claims. MedImmune filed a notice of appeal of this judgment with the U.S. Court of Appeals for the Federal Circuit. Concurrently, in the District Court litigation, Genentech filed a motion to dismiss all remaining claims in the case. On April 23, 2004, the District Court granted Genentech's motion and dismissed all remaining claims. Final judgment was entered in Genentech's favor on May 3, 2004, thus concluding proceedings in the District Court. Because the appeal process is ongoing, the final outcome of this matter cannot be determined at this time.

We recorded $13.4 million and $13.3 million in the first quarters of 2004 and 2003, respectively, for accrued interest and bond costs related to the COH trial judgment. In 2002, we recognized $543.9 million of litigation-related special charges, which included the COH trial judgment, including accrued interest and bond costs, and certain other litigation-related matters. In conjunction with the City of Hope judgment, we arranged to post a $600.0 million surety bond and as part of this arrangement, we were required to pledge $630.0 million in cash and investments to secure the bond. In addition, we accrued $2.4 million in the first quarter of 2003 of royalty expenses related to the City of Hope judgment, which was reflected in marketing, general and administrative expenses. There was no such expense in the first quarter of 2004. We expect that we will continue to incur interest charges on the judgment and service fees on the surety bond each quarter through the process of appealing the City of Hope trial results. These special charges represent our estimate of the costs for the current resolution of these matters and are included in other long-term liabilities in the condensed consolidated balance sheets at March 31, 2004 and December 31, 2003. We developed these estimates in consultation with outside counsel handling our defense in these matters using the facts

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and circumstances of these matters known to us at that time. The amount of our liability for certain of these matters could exceed or be less than the amount of our current estimate, depending on the outcome of these matters. The amount of cash, if any, paid in connection with the City of Hope matter will depend on the outcome of the appeal.

We enter into transactions with our related parties, Roche Holdings, Inc. (including Hoffmann-La Roche and other affiliates) and Novartis, in the ordinary course of business. The accounting policies we apply to our transactions with our related parties are consistent with those used in transactions with independent third-parties.

On June 30, 1999, we redeemed all of our outstanding Special Common Stock held by stockholders other than Roche with funds deposited by Roche for that purpose. This event, referred to as the "Redemption," caused Roche to own 100% of our common stock on that date. The Redemption was reflected as a purchase of a business, which under GAAP required us to reflect in our financial statements the amount paid for our stock in excess of our net book value plus Roche's transaction costs at June 30, 1999. See Note 4, "Other Intangible Assets," for the amortization of our other intangible assets.

We expect from time to time to issue additional shares of common stock in connection with our stock option and stock purchase plans, and we may issue additional shares for other purposes. Our affiliation agreement with Roche provides, among other things, that we will establish a stock repurchase program designed to maintain Roche's percentage ownership interest in our common stock. The affiliation agreement provides that we will repurchase a sufficient number of shares pursuant to this program such that, with respect to any issuance of common stock by Genentech in the future, the percentage of Genentech common stock owned by Roche immediately after such issuance will be no lower than Roche's lowest percentage ownership of Genentech common stock at any time after the offering of common stock occurring in July 1999 and prior to the time of such issuance, except that Genentech may issue shares up to an amount that would cause Roche's lowest percentage ownership to be no more than 2% below the "Minimum Percentage." The Minimum Percentage equals the lowest number of shares of Genentech common stock owned by Roche since the July 1999 offering (to be adjusted in the future for dispositions of shares of Genentech common stock by Roche as well as for stock splits or stock combinations) divided by 509,194,352 (to be adjusted in the future for stock splits or stock combinations), which is the number of shares of Genentech common stock outstanding at the time of the July 1999 offering, as adjusted for the two-for-one splits of Genentech common stock in November 1999 and October 2000. We repurchased shares of our common stock in 2003 (see Note 10, "Stock Repurchases Program"). As long as Roche's percentage ownership is greater than 50%, prior to issuing any shares, the affiliation agreement provides that we will repurchase a sufficient number of shares of our common stock such that, immediately after our issuance of shares, Roche's percentage ownership will be greater than 50%. The affiliation agreement also provides that, upon Roche's request, we will repurchase shares of our common stock to increase Roche's ownership to the Minimum Percentage. In addition, Roche will have a continuing option to buy stock from us at prevailing market prices to maintain its percentage ownership interest. Roche also has issued zero-coupon notes (which were offered publicly in January 2000) exchangeable for an aggregate of 13,034,618 shares of our common stock held by Roche. As of March 31, 2004, a total of 9,840,309 shares of our common stock owned by Roche have been issued in exchange for the zero-coupon notes, decreasing Roche's ownership to 55.9%. The Minimum Percentage at March 31, 2004 was 58.3% and, under the terms of the affiliation agreement, Roche's lowest ownership percentage is to be no lower than 56.3%. See Note 10 "Capital Stock" for information regarding our stock repurchase program.

In June 2003, Hoffmann-La Roche exercised its option to license from us the rights to market Avastin for all countries outside of the U.S. under its existing licensing agreement with us. As part of its opt-in, Hoffmann-La Roche paid us approximately $188.0 million and will pay 75% of subsequent global development costs related to the metastatic colorectal cancer indication of Avastin and all others unless Hoffmann-La Roche specifically opts out of the development of certain other indications.

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In September 2003, Hoffmann-La Roche exercised its option to license from us the rights to market PRO70769, a humanized antibody that binds to CD20, for all countries outside of the U.S. (other than territory previously licensed to others) under the existing licensing agreement. As part of its opt-in, Hoffmann-La Roche paid us $8.4 million and will pay 50% of subsequent global development costs related to PRO70769 unless Roche opts out of the development of certain other indications. We will receive royalties on net sales of Avastin and PRO70769 in countries outside of the U.S.

As part of our licensing and marketing agreement, we recognized contract revenue from Hoffmann-La Roche, including amounts earned related to ongoing development activities, of $25.8 million and $2.0 million in the first quarters of 2004 and 2003, respectively. All other revenues from Roche, Hoffmann-La Roche and their affiliates, principally royalties and product sales, were $98.9 million and $76.3 million in the first quarters of 2004 and 2003, respectively. In 2003, Hoffmann-La Roche's Penzberg, Germany facility became the primary site for the manufacturing of Herceptin to supply ex-U.S. territories. Our ex-U.S. sales of Herceptin to Hoffmann-La Roche were $4.8 million in the first quarter of 2004. We had no such sales in the first quarter of 2003. Cost of sales included amounts related to Roche of $22.4 million and $24.8 million in the first quarters of 2004 and 2003, respectively. R&D expenses included amounts related to Roche of $36.8 million and $8.4 million in the first quarters of 2004 and 2003, respectively.

We understand that Novartis holds approximately 33.3% of the outstanding voting shares of Roche Holding AG. As a result of this ownership, Novartis is deemed to have an indirect beneficial ownership interest under FAS 57 "Related Party Disclosures" of more than 10% of Genentech's voting common stock.

In June 2003, we entered into an agreement with Novartis Ophthalmics AG (subsequently merged into Novartis Pharma AG), under which Novartis Opthalmics licensed the exclusive right to develop and market Lucentis outside of North America for diseases or disorders relating to the human eye, including the indication of age-related macular degeneration (or AMD). As part of this agreement, Novartis Opthalmics pays 50% of Genentech's expenses relating to certain AMD Phase III trials and related development expenses. Genentech may share in a portion of the development costs incurred by Novartis outside of North America. We may also receive royalties on net sales of Lucentis products, which we will manufacture and supply to Novartis, outside of North America, and certain milestone payments.

In February 2004, Genentech, Inc., Novartis Pharma AG and Tanox, Inc. settled all litigation pending among them, and finalized the detailed terms of their three-party collaboration, begun in 1996, to govern the potential development and commercialization of certain anti-IgE antibodies including Xolair® (Omalizumab) and TNX-901. This arrangement modifies the arrangement related to Xolair that we entered into with Novartis in 2000. All three parties are co-developing Xolair in the U.S., and Genentech and Novartis are co-promoting Xolair in the U.S. and both will separately make payments to Tanox; Genentech's will be in the form of royalties. Genentech records all sales and cost of sales in the U.S. and Novartis will market the product in and record all sales and cost of sales in Europe. Genentech and Novartis then share the resulting U.S. and European operating profits, respectively, according to prescribed profit-sharing percentages. The existing royalty and profit-sharing percentages between the three parties remain unchanged. Genentech is currently supplying the product and receives cost plus a mark-up similar to other supply arrangements. Novartis plans to assume primary manufacturing responsibilities in the future.

Contract revenue from Novartis was $10.8 million in the first quarter of 2004 and not material in the first quarter of 2003. Collaboration profit sharing expenses were $11.8 million in the first quarter of 2004 and not material in the first quarter of 2003. R&D expenses included amounts related to Novartis of $9.7 million in the first quarter of 2004 and $3.7 million in the first quarter of 2003.

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The components of our acquisition-related other intangible assets, including those arising from the Redemption and push-down accounting, at March 31, 2004 and December 31, 2003, were as follows (in millions):

Amortization expense of our other intangible assets was $43.0 million in each of the first quarters of 2004 and 2003.

The expected future annual amortization expense of our other intangible assets is as follows (in millions):

We record gains and losses on derivatives related to our equity hedging instruments in "other income, net" in the condensed consolidated statements of income. Such gains or losses were not material in the first quarters of 2004 or 2003.

At March 31, 2004, net losses on derivative instruments expected to be reclassified from accumulated other comprehensive income to "other income, net" during the next twelve months are $3.9 million. These net losses are primarily due to the recognition of premiums related to maturing foreign currency exchange options.

Comprehensive income is comprised of net income and other comprehensive income (or OCI). OCI includes certain changes in stockholders' equity that are excluded from net income. Specifically, we include in OCI changes in the fair value of derivatives designated as effective cash flow hedges and unrealized gains and losses on our available-for-sale securities. The activity in comprehensive income, net of taxes, during the first quarters of 2004 and 2003 was as follows (in millions):

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The components of accumulated OCI, net of taxes, were as follows (in millions):

The activity in OCI, net of taxes, during the first quarters of 2004 and 2003 related to our available-for-sale securities was as follows (in millions):

The activity in OCI, net of taxes, during the first quarters of 2004 and 2003, related to our cash flow hedges was not material.

The following is a reconciliation of the denominator used in basic and diluted earnings per share (or EPS) computations for the first quarters of 2004 and 2003 (in thousands):

Options to purchase 0.1 million shares of common stock between $99.41 and $113.27 per share were outstanding in the first quarter of 2004, and options to purchase 24.1 million shares of common stock between $35.87 and $95.66 per share were outstanding in the first quarter of 2003. These options were excluded from the computation of diluted EPS because such options were anti-dilutive in the respective periods presented.

The components of inventories were as follows (in millions):

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Work in process included pre-approval product candidate inventories, net of reserves, of $86.7 million at December 31, 2003. We had no inventories for pre-approval product candidates at March 31, 2004. Certain of such inventories were sold during the quarter ended March 31, 2004.

Our long-term debt at March 31, 2004 and December 31, 2003 consisted of $412.3 million of debt related to a variable interest entity (or VIE), which we consolidated on July 1, 2003, with minimum interest payable at 1.2%, due in November 2006. See discussion on this VIE in Note 2 above.

Under a stock repurchase program approved by our Board of Directors on December 5, 2003, Genentech is authorized to repurchase up to 12,500,000 shares for an aggregate purchase price of up to $1 billion of its common stock through December 31, 2004. In this plan, as in previous stock repurchase plans, purchases may be made in the open market or in privately negotiated transactions from time to time at management's discretion. Genentech also may engage in transactions in other Genentech securities in conjunction with the repurchase program, including certain derivative securities. Genentech intends to use the repurchased stock to offset dilution caused by the issuance of shares in connection with Genentech's employee stock plans. Although there are currently no specific plans for the shares that may be purchased under the program, our goals for the program are (i) to make prudent investments of our cash resources; (ii) to allow for an effective mechanism to provide stock for our employee stock plans; and (iii) to address provisions of our affiliation agreement with Roche relating to maintaining Roche's minimum ownership percentage. That minimum ownership percentage which is equal to the Minimum Percentage described in Note 3 less 2% is 56.3%. Under a previous stock repurchase program approved by our Board of Directors, Genentech was authorized to repurchase up to $1 billion of our common stock through the period ended June 30, 2003.

Under our current stock repurchase program, we had no repurchases during the first quarter of 2004. The only shares repurchased under this plan were 70,900 shares repurchased in December 2003 at an average price per share of $85.63. At March 31, 2004, the approximate dollar value of shares that may yet be purchased under this program is $993.9 million.

The par value method of accounting is used for common stock repurchases. The excess of the cost of shares acquired over the par value is allocated to additional paid-in capital with the amounts in excess of the estimated original sales price charged to accumulated deficit.

The effective tax rate was 34% in the first quarter of 2004 compared to 27% in the first quarter of 2003. The increase in the tax rate reflects a decrease in benefits related to changes in estimates of prior year items. The tax provision for the first quarter of 2004 included a benefit of $6.5 million related to a favorable change in estimates of research credits.

On April 16, 2004, at our annual meeting, our shareholders approved an increase in our authorized common stock. Based on stockholder approval of the increase in authorized common stock, the Board approved a two-for-one stock split of our common stock in the form of a stock dividend of one share of Genentech common stock for each share held at the close of business on April 28, 2004. Our stock will begin trading on a split-adjusted basis on May 13, 2004. All information in this report relating to the number of shares, price per share and per share amounts of common stock are presented on a pre-split basis.

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Under our stock repurchase program approved by our Board of Directors on December 5, 2003, we have repurchased 800,000 shares of our common stock at a cost of approximately $93.2 million during the period from April 1, 2004 through April 23, 2004. For more information on our stock repurchase program, see the "Capital Stock" note above.

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We have reviewed the accompanying condensed consolidated balance sheet of Genentech, Inc. as of March 31, 2004, and the related condensed consolidated statements of income and cash flows for the three-month periods ended March 31, 2004 and 2003. These financial statements are the responsibility of Genentech's management.

We conducted our reviews in accordance with standards established by the American Institute of Certified Public Accountants. A review of interim financial information consists principally of applying analytical procedures to financial data, and making inquiries of persons responsible for financial and accounting matters. It is substantially less in scope than an audit conducted in accordance with auditing standards generally accepted in the United States, which will be performed for the full year with the objective of expressing an opinion regarding the financial statements taken as a whole. Accordingly, we do not express such an opinion.

Based on our reviews, we are not aware of any material modifications that should be made to the accompanying condensed consolidated financial statements referred to above for them to be in conformity with accounting principles generally accepted in the United States.

We have previously audited, in accordance with auditing standards generally accepted in the United States, the consolidated balance sheet of Genentech, Inc. as of December 31, 2003, and the related consolidated statements of income, stockholders' equity, and cash flows for the year then ended (not presented herein) and in our report dated January 13, 2004 (except for the second paragraph of the note titled Subsequent Events and the twenty-first paragraph of the note titled Leases, Commitments and Contingencies, as to which the date is February 25, 2004), we expressed an unqualified opinion on those consolidated financial statements. In our opinion, the information set forth in the accompanying condensed consolidated balance sheet as of December 31, 2003, is fairly stated, in all material respects, in relation to the consolidated balance sheet from which it has been derived.

Palo Alto, California
April 6, 2004, except for the
eleventh paragraph of Note 2
and all of Note 12, as to which the
date is April 23, 2004

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GENENTECH, INC.
FINANCIAL REVIEW

Genentech, Inc. is a leading biotechnology company that discovers, develops, manufactures, and commercializes biotherapeutics for significant unmet medical needs. We manufacture and commercialize in the United States 13 biotechnology products and license several additional products to other companies.

Genentech primarily earns revenues and income and generates cash from product sales, contract revenues and royalties. We also generate other income from gains on sales of stocks in our biotechnology equity portfolio and interest from our investment portfolio. In 2004, we expect the growth of our business to be driven by sales of our new products, Avastin, Xolair and Raptiva and continued strong sales of our established oncology products, Rituxan and Herceptin. We also expect sales of our legacy products, contract revenues and royalties to continue to contribute to the bottom-line. In the first quarter of 2004, our total operating revenues were $975.1 million, our net income was $176.6 million and our current assets at March 31, 2004 were approximately $3.0 billion.

Our short-term business objectives are driven by our 5x5 goals, which began in 1999 and continue through 2005. Our most important goal is to achieve 25 percent average annual non-GAAP EPS growth; we are tracking well toward this goal. Our goal of achieving 25 percent non-GAAP net income as a percentage of revenues will probably not be met, primarily due to our profit sharing arrangement for Rituxan. We have exceeded our goal of five new products or indications approved, as seven new products or indications have been approved since 1999. We are well positioned to exceed our goal of five significant products in late stage clinical development by the end of 2005. At this time, we are uncertain if we will meet our goal of $500 million in new revenue from alliances and/or acquisitions, as we changed our strategic focus to pursue earlier stage rather than later stage opportunities.

Our long-term business objectives are reflected in our Horizon 2010 strategy and goals set forth below.

• To aim to become the number one U.S. oncology company in sales by 2010. We recognize that this goal is highly ambitious and that there will be formidable competition from other companies, particularly given the rate of new business consolidations in our industry. We face many challenges in meeting this goal, such as FDA approval, clinical trial success, and advantageous government reimbursement rates.

• To position ourselves for continued leadership in our oncology franchise by bringing five new oncology products or indications for existing products into clinical development and into the market.

• To build a leading immunology franchise by expanding the fundamental understanding of immune disorders, bringing at least five new immunology products or indications into clinical development, and obtaining U.S. Food and Drug Administration (FDA) approval of at least five new indications or products by 2010.

• To increase our leadership in developing biotherapeutics for disorders of tissue growth and repair, with a major focus on angiogenic disorders, and to move at least three new projects into late-stage research or developmental research and three or more new projects into clinical development by 2010.

• To achieve average annual EPS growth rates sufficient to be considered a growth company.

Achieving these goals depends on our ability to quickly capitalize on advances in basic research, to balance speed in clinical development with designing high quality trials, to shape the markets for our products, to influence the practice of medicine, to increase our manufacturing capability and to maintain our unique corporate culture during a period of rapid growth.

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As a business in a highly regulated and competitive industry, we face many opportunities, risks and challenges. There are many economic and industry-wide factors that affect our business, including increasing complexity and cost of pharmaceutical research and development, leadership changes at the FDA, increases in clinical development timeframes, declines in numbers of new products that the FDA is approving, changes in reimbursement under recent Medicare legislation and initiatives towards generic biologics.

The Medicare Prescription Drug, Improvement and Modernization Act (or the Medicare Act) was enacted into law in December 2003. We are monitoring closely the impact on our business of the reform of the Average Wholesale Price (AWP) mechanism as the basis of oncology reimbursement under Medicare. Physician reaction to the Medicare Act may have caused some disruption in the ordering of Rituxan in the first few weeks of 2004. However, orders for February and March of 2004 have met our expectations.

With respect to generic biologics, we believe that current technology cannot prove a generic biotechnology product to be safe and effective outside the New Drug Application (or NDA) and Biologics License Application (or BLA) process. However, we believe growth hormone may be one of the first likely products for which a generic approval route will be attempted.

This past year we experienced the largest annual growth in employee numbers in our history, recruiting and hiring more than 1,500 new employees. Our continued growth depends on our ability to bring highly qualified and talented people into all areas of our company. It also depends on our ability to retain our employees. Integrating this number of new employees into our company will be a significant challenge for management and we have focused our attention on this important area.

We have ramped up manufacturing efforts in both our South San Francisco and Vacaville facilities to meet increased product demand. We recently announced a decision to expand our Vacaville facility; the expansion of this facility is expected to cost approximately $600 million over the next several years. In addition, we entered into a long-term manufacturing agreement with Lonza Biologics, under which Lonza will manufacture commercial quantities of Rituxan at Lonza's production facility in Portsmouth, New Hampshire. We also made progress on our facility in Porriño, Spain (Genentech España) and now expect to bring it online in 2004 to produce Avastin for clinical trials. All of these projects are critical to providing sufficient capacity to meet expected demand for our products.

Intellectual property protection of our products is also crucial to our business. We are often involved in challenges over contracts and intellectual property and we work to resolve these disputes in confidential negotiations. We expect legal challenges in this area to continue. We plan to continue to build upon and defend our intellectual property position. The resources required to do this are significant.

In the first quarter of 2004, we saw growth in our operating revenues, net income and earnings per share as compared to the first quarter of 2003. Sales of Avastin, launched on February 26, 2004, were $38.1 million. Our initial sales data suggests that Avastin use is consistent with its broad label, including use in combination with both oxaliplatin and irinotecan based regimens. Sales of Xolair were $30.0 million. This is an increase of 63% as compared to the fourth quarter of 2003. This growth reflects good market penetration and high patient compliance. Sales of Raptiva were $6.3 million. More than 80% of patients being identified for Raptiva therapy have not been previously treated with a biologic and over one-fourth of patients moved to Raptiva therapy after being treated with topical agents only. This is an important indicator that Raptiva is not being reserved for use only in patients failing to respond to systemic or other biologic therapies. Rituxan sales increased 17% from the first quarter of 2003 and decreased 3% from the fourth quarter of 2003. This reflects a slowing of the Rituxan growth rate, inventory adjustments made by wholesalers at the beginning of the year and possible reaction to the Medicare legislation. We believe the opportunities for long-term Rituxan sales growth lie in potential new indications, particularly in immunology, and in the potential for use of Rituxan in the maintenance setting in treating non-Hodgkin's lymphoma. Sales of Herceptin increased 21% from the first quarter of 2003 and decreased 1% from the fourth quarter of 2003. We believe the opportunity for long-term Herceptin sales growth lies in the adjuvant setting. Sales for the growth hormone and Pulmozyme products grew slowly, while sales of thrombolytics declined slightly. Royalties and contract revenues increased due to higher sales by licensees, recognition of product opt-in revenue and reimbursements for on-going

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collaborations. Operating expenses increased as a result of increased MG&A and R&D expenses and we expect this trend to continue this year. Cost of sales as a percentage of sales have declined due to higher sales of more favorable margin products, lower royalty expenses and lower production costs.

We, OSI Pharmaceuticals, Inc. and Roche announced on April 25, 2004, that a Phase III study of Tarceva in previously treated patients with non-small cell lung cancer met its primary endpoint of improving overall survival, with patients receiving Tarceva living longer than those in the placebo arm of the study. The trial also met secondary endpoints including improving time to symptomatic deterioration, progression-free survival and response rate. OSI will work with the FDA to complete the filing of the NDA for Tarceva.

Rituxan (rituximab) anti-CD20 antibody is for the treatment of patients with relapsed or refractory, low-grade or follicular, CD20-positive, B-cell non-Hodgkin's lymphoma, a cancer of the immune system, including retreatment, times 8 dosing and bulky disease. We co-developed Rituxan with Biogen Idec Inc. (or Biogen Idec), formerly known as IDEC Pharmaceuticals Corporation, one of the predecessor companies, from whom we licensed Rituxan.

Herceptin (trastuzumab) anti-HER2 antibody is the a humanized antibody for the treatment of certain patients with metastatic breast cancer whose tumors overexpress the Human Epidermal growth factor Receptor type 2 (or HER2) protein. Herceptin is approved for use as a first-line therapy in combination with Taxol® (paclitaxel), a product made by Bristol-Myers Squibb Company (or Bristol-Myers), and other drugs, and as a single agent in second- and third-line therapy in patients with metastatic breast cancer who have tumors that overexpress the HER2 protein.

Nutropin Depot [somatropin (rDNA origin) for injectable suspension] is a long-acting growth hormone for the treatment of growth failure associated with pediatric growth hormone deficiency. It uses ProLease®, an injectable extended-release drug delivery system, which was developed by our collaborator Alkermes, Inc.

Nutropin [somatropin (rDNA origin) for injection] is a growth hormone for the treatment of growth hormone deficiency in children and adults, growth failure associated with chronic renal insufficiency prior to kidney transplantation and short stature associated with Turner syndrome. Nutropin is similar to Protropin (see below); however, it does not have the additional N-terminal amino acid, methionine, found in the Protropin chemical structure.

Protropin (somatrem for injection) is a growth hormone approved for the treatment of growth hormone inadequacy in children. Manufacture of Protropin was discontinued at the end of 2002 because physicians are typically initiating therapy with one of the Nutropin family products and the demand for Protropin has declined, but sales are expected to continue through the first half of 2004 or until inventory is depleted.

Nutropin AQ [somatropin (rDNA origin) for injection] is a liquid formulation growth hormone for the same indications as Nutropin and is aimed at providing improved convenience in administration.

TNKase (tenecteplase) is a single-bolus thrombolytic agent for the treatment of acute myocardial infarction (heart attack).

Activase (alteplase, recombinant) is a tissue plasminogen activator (or t-PA) approved for the treatment of acute myocardial infarction (heart attack), acute ischemic stroke (blood clots in the brain) within three hours of the onset of symptoms and acute massive pulmonary embolism (blood clots in the lungs).

Cathflo Activase (alteplase, recombinant) is a thrombolytic agent for the restoration of function to central venous access devices that have become occluded due to a blood clot.

Pulmozyme (dornase alfa, recombinant) is an inhalation solution for the treatment of cystic fibrosis.

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Xolair (omalizumab) is an anti-IgE antibody, which we commercialize with Novartis, for the treatment of moderate-to-severe persistent asthma in adults and adolescents. We received FDA approval in June 2003.

Raptiva (efalizumab) is an anti-CD11a antibody co-developed with XOMA Ltd. It was approved by the FDA in October 2003 for the treatment of chronic moderate-to-severe plaque psoriasis in adults age 18 or older who are candidates for systemic therapy or phototherapy.

Avastin (bevacizumab) is an antibody approved by the FDA on February 26, 2004 for use in combination with intravenous 5-fluorouracil-based chemotherapy as a treatment for patients with first-line (or previously untreated) metastatic cancer of the colon or rectum. We began shipping Avastin on February 26, 2004.

We receive royalties from F. Hoffmann-La Roche (or Hoffmann-La Roche) on sales of:

• Rituxan, Herceptin and Pulmozyme outside of the United States (or U.S.), and

• growth hormone products, Rituxan, Pulmozyme, Activase, Cathflo Activase and TNKase in Canada.

We receive royalties from third parties on sales of:

• Activase outside of the U.S. and Canada, and

• TNKase outside of the U.S., Canada and Japan.

We also receive worldwide royalties on additional licensed products that are marketed by other companies. Some of our products are sold under different trademarks or trade names when sold outside of the U.S.

On June 30, 1999, we redeemed all of our outstanding Special Common Stock held by stockholders other than Roche Holdings, Inc. (or Roche) at a price of $20.63 per share in cash with funds deposited by Roche for that purpose. We refer to this event as the "Redemption." As a result, on that date, Roche's percentage ownership of our outstanding Common Stock increased from 65% to 100%. Consequently, under accounting principles generally accepted in the United States (or GAAP), we were required to use push-down accounting to reflect in our financial statements the amounts paid for our stock in excess of our net book value. Push-down accounting required us to record $1,685.7 million of goodwill and $1,499.0 million of other intangible assets onto our balance sheet on June 30, 1999. See also below in the "Recurring Charges Related to Redemption" section of Results of Operations and Note 3, "Related Parties," in the Notes to Condensed Consolidated Financial Statements.

We expect from time to time to issue additional shares of common stock in connection with our stock option and stock purchase plans, and we may issue additional shares for other purposes. Our affiliation agreement with Roche provides, among other things, that we establish a stock repurchase program designed to maintain Roche's percentage ownership interest in our common stock. The affiliation agreement provides that we will repurchase a sufficient number of shares pursuant to this program such that, with respect to any issuance of common stock by Genentech in the future, the percentage of Genentech common stock owned by Roche immediately after such issuance will be no lower than Roche's lowest percentage ownership of Genentech common stock at any time after the offering of common stock occurring in July 1999 and prior to the time of such issuance, except that Genentech may issue shares up to an amount that would cause Roche's lowest percentage ownership to be no more than 2% below the "Minimum Percentage." The Minimum Percentage equals the lowest number of shares of Genentech common stock owned by Roche since the July 1999 offering (to be adjusted in the future for dispositions of shares of Genentech common

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stock by Roche as well as for stock splits or stock combinations) divided by 509,194,352 (to be adjusted in the future for stock splits or stock combinations), which is the number of shares of Genentech common stock outstanding at the time of the July 1999 offering, as adjusted for the two-for-one splits of Genentech common stock in November 1999 and October 2000. We repurchased shares of our common stock in 2003 (see discussion in Note 10, "Stock Repurchases," in the Notes to Condensed Consolidated Financial Statements of Part I, Item 1 of this Form 10-Q). As long as Roche's percentage ownership is greater than 50%, prior to issuing any shares, the affiliation agreement provides that we will repurchase a sufficient number of shares of our common stock such that, immediately after our issuance of shares, Roche's percentage ownership will be greater than 50%. The affiliation agreement also provides that, upon Roche's request, we will repurchase shares of our common stock to increase Roche's ownership to the Minimum Percentage. In addition, Roche will have a continuing option to buy stock from us at prevailing market prices to maintain its percentage ownership interest. Roche also has issued zero-coupon notes (which were offered publicly in January 2000) exchangeable for an aggregate of 13,034,618 shares of our common stock held by Roche. As of March 31, 2004, a total of 9,840,309 shares of our common stock owned by Roche have been issued in exchange for the zero-coupon notes, decreasing Roche's ownership to 55.9%. The Minimum Percentage at March 31, 2004 was 58.3% and, under the terms of the affiliation agreement, Roche's lowest ownership percentage is to be no lower than 56.3%. See Note 10 "Capital Stock" for information regarding our stock repurchase program.

The following information can be found on our website at http://www.gene.com or can be obtained free of charge by contacting our Investor Relations Department at (650) 225-1599 or by sending an e-mail message to investor.relations@gene.com:

• our annual report on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and any amendments to those reports as soon as reasonably practicable after such material is electronically filed with the Securities and Exchange Commission;

• our policies related to corporate governance, including Genentech's Good Operating Principles (Genentech's code of ethics applying to Genentech's directors, officers and employees) as well as Genentech's Code of Ethics applying to our chief executive officer and senior financial officials; and

• the charter of the Audit Committee of our Board of Directors.

The accompanying discussion and analysis of our financial condition and results of operations are based upon our condensed consolidated financial statements and the related disclosures, which have been prepared in accordance with accounting principles generally accepted in the United States. The preparation of these financial statements requires us to make estimates, assumptions and judgments that affect the reported amounts in our condensed consolidated financial statements and accompanying notes. These estimates form the basis for making judgments about the carrying values of assets and liabilities. We base our estimates and judgments on historical experience and on various other assumptions that we believe to be reasonable under the circumstances. Actual results could differ materially from these estimates.

We believe the following policies to be the most critical to an understanding of our financial condition and results of operations because they require us to make estimates, assumptions and judgments about matters that are inherently uncertain.

We are currently involved in certain legal proceedings as discussed in Note 2, "Leases and Contingencies" in the Notes to Condensed Consolidated Financial Statements of Part I, Item 1 of this Form 10-Q. We assess the likelihood

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of any adverse judgments or outcomes to these legal matters as well as potential ranges of probable losses. As of March 31, 2004, we have accrued $621.2 million, which represents our estimate of the costs for the current resolution of these matters. We developed these estimates in consultation with outside counsel handling our defense in these matters using the facts and circumstances known to us at that time. The nature of these matters is highly uncertain and subject to change. As a result, the amount of our liability for certain of these matters could exceed or be less than the amount of our current estimates, depending on the outcome of these matters. An outcome of such matters different than previously estimated could materially impact our financial position or our results of operations in any one quarter.

We recognize revenue from the sale of our products, royalties earned and contract arrangements. Our revenue arrangements with multiple elements are divided into separate units of accounting if certain criteria are met, including whether the delivered element has stand-alone value to the customer and whether there is objective and reliable evidence of the fair value of the undelivered items. The consideration we receive is allocated among the separate units based on their respective fair values, and the applicable revenue recognition criteria are applied to each of the separate units. Advance payments received in excess of amounts earned are classified as deferred revenue until earned.

• We recognize revenue from product sales when there is persuasive evidence that an arrangement exists, title passes, the price is fixed and determinable, and collectibility is reasonably assured. Allowances are established for estimated uncollectible amounts, product returns and discounts.

• We recognize revenue from royalties based on licensees' sales of our products or technologies. Royalties are recognized as earned in accordance with the contract terms when royalties from licensees can be reliably measured and collectibility is reasonably assured. Royalty estimates are made in advance of amounts collected using historical and forecasted trends.

• Contract revenue generally includes upfront and continuing licensing fees, manufacturing fees, milestone payments and reimbursements of development costs and post-marketing costs.

• Nonrefundable upfront fees, including milestone payments, for which no further performance obligations exist are recognized as revenue on the earlier of when payments are received or collection is assured.

• Nonrefundable upfront licensing fees, including product opt-ins, milestone payments, and certain guaranteed, time-based payments that require continuing involvement in the form of development, manufacturing or other commercialization efforts by us are recognized as revenue:

• ratably over the development period if development risk is significant, or

• ratably over the manufacturing period or estimated product useful life if development risk has been substantially eliminated.

• Manufacturing payments are recognized as revenue as the related manufacturing services are rendered, generally on a straight-line basis over the longer of the manufacturing obligation period or the expected product life.

• Milestone payments are recognized as revenue when milestones, as defined in the contract, are achieved.

• Reimbursements of development and post-marketing costs are recognized as revenue as the related costs are incurred.

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Income tax expense (benefit) is based on pretax financial accounting income under the liability method. Deferred tax assets and liabilities are determined based on the difference between the financial statement and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. Significant estimates are required in determining our provision (benefit) for income taxes. Some of these estimates are based on interpretations of existing tax laws or regulations. We believe that our estimates are reasonable and that our reserves for income tax related uncertainties are adequate. Various internal and external factors may have favorable or unfavorable effects on our future effective tax rate. These factors include, but are not limited to, changes in tax laws, regulations and/or rates, changing interpretations of existing tax laws or regulations, future levels of R&D spending, future levels of capital expenditures, and changes in overall levels of pretax earnings.

Inventories consist of currently marketed products, products manufactured under contract and product candidates awaiting regulatory approval, which are capitalized based on management's judgment of probable near term commercialization. The valuation of inventory requires us to estimate obsolete or excess inventory. The determination of obsolete or excess inventory requires us to estimate the future demands for our products, and in the case of pre-approval inventories, an assessment of the likelihood of the regulatory approval for the product. We may be required to expense previously capitalized costs related to pre-approval inventory upon a change in such judgment, due to, among other potential factors, a denial or delay of approval by the necessary regulatory bodies. In the event that a pre-approval product candidate receives regulatory approval, subsequent sales of previously reserved inventory will result in increased gross margins.

As part of our strategic efforts to gain access to potential new products and technologies, we invest in equity securities of certain private biotechnology companies. Our nonmarketable equity securities are carried at cost unless we determine that an impairment that is other than temporary has occurred, in which case we write the investment down to its impaired value. We periodically review our investments for impairment; however, the impairment analysis requires significant judgment in identifying events or circumstances that would likely have significant adverse effect on the fair value of the investment. The analysis may include assessment of the investee's (i) revenue and earnings trend, (ii) business outlook for its products and technologies, (iii) liquidity position and the rate at which it is using its cash, and (iv) likelihood of obtaining subsequent rounds of financing. If an investee obtains additional funding at a valuation lower than our carrying value, we presume that the investment is other than temporarily impaired. We have experienced impairments in our portfolio due to the decline in equity markets over the past few years. However, we are not able to determine at the present time which specific investments are likely to be impaired in the future, or the extent or timing of the individual impairments.

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___________

Total operating revenues increased 30% in the first quarter of 2004 from the comparable period in 2003. This increase was due to higher product sales, royalty income and contract revenues. These increases are further discussed below.

Total net product sales increased 28% in the first quarter of 2004 from the comparable period in 2003. The increase was due to higher sales across most of our existing products, in particular Rituxan, and sales of our new products, specifically Avastin, Xolair and Raptiva. Increased volume, including new product shipments, accounted for a 21% sales increase, or $127.5 million, in the first quarter of 2004. Higher sales prices across the entire product suite accounted for $37.7 million of the increase in the first quarter of 2004.

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Net sales of Rituxan increased 17% to $400.6 million in the first quarter of 2004 from the comparable period in 2003. This growth was driven by greater penetration of the non-Hodgkin's lymphoma (or NHL) and chronic lymphocytic leukemia (or CLL) markets in the U.S. (specifically front line indolent NHL, front line CLL, and maintenance use), and to a lesser extent the ongoing impact of a price increase implemented in March 2003. Also contributing to the increase was growth in ex-U.S. sales to our partner Roche.

Although sales were strong for the year over year period, net sales of Rituxan decreased 3% from the prior quarter. This decrease was a result of inventory adjustments made by wholesalers at the beginning of 2004 and also reflected initial caution among some physicians as they adjusted to the new reimbursement methodology under the Medicare Prescription Drug Improvement and Modernization Act, enacted in December 2003 (or the Medicare Act). Future sales of Rituxan may be adversely affected if physicians prescribe less of Rituxan in light of the decrease in the Rituxan reimbursement rate under the Medicare Act. However, our February and March 2004 orders and our first quarter adoption data appear to reflect continuing demand for Rituxan, albeit at a slower rate of growth than we have previously seen. Given Rituxan's unique clinical benefits and lack of a direct substitute therapy, we currently believe there will be limited impact on its usage. However, we will continue to monitor the Medicare situation closely.

Net sales of Herceptin increased 21% in the first quarter of 2004 from the comparable period in 2003. The continued growth was primarily driven by physicians' extending the average treatment duration for two reasons. First, physicians have been using Herceptin in more than one line of therapy. Second, there is a growing interest in the combination of Herceptin, carboplatin and a taxane otherwise known as TCH; this particular regimen has an improved time to disease progression and can therefore lead to a longer treatment duration. The adoption rate of this regimen among oncologists has shown growth in the first quarter of 2004 from the comparable period in 2003. Although future sales of Herceptin may be adversely affected if physicians prescribe less Herceptin in light of the decrease in the Herceptin reimbursement rate under the Medicare Act, we currently believe there will be limited impact on Herceptin's usage, particularly in light of the increase in drug administration services reimbursement rates. Also impacting our future sales growth is a price increase that was effective on April 1, 2004.

We received FDA approval to market Avastin on February 26, 2004 and made initial product shipments to distributors that same day. Avastin achieved total net sales of $38.1 million in the five weeks it was available in the first quarter of 2004. Of this, $13.9 million represents the initial distribution to drug wholesalers. Among all accounts ordering Avastin from drug wholesalers, more than 50% have placed reorders. Future sales and the adoption of the use of Avastin are subject to a number of risks and uncertainties. Avastin is currently being studied in combination with 5-FU/ Leucovorin and Oxaliplatin (the "FOLFOX Regimen") in patients with relapsed, metastatic colorectal cancer in a large randomized study through the Eastern Cooperative Oncology Group (the "E3200 Trial"). If the results from the E3200 Trial are positive for the combination of Avastin and 5-FU/Leucovorin and Oxaliplatin or show a similar magnitude of benefit as previous colorectal cancer studies with Avastin, use of Avastin may increase as physicians increase their use of Avastin in combination with Oxaliplatin-based regimens in the relapsed, and also the first-line setting. However, if the results of the E3200 Trial are negative for the combination of Avastin and 5-FU/Leucovorin and Oxaliplatin, potential sales of Avastin may be materially adversely affected as physicians may limit their use of Avastin to 5-FU/Leucovorin and/or irinotecan regimens. Physicians may also restrict their use of Avastin to first-line patients only.

Combined net sales of our four growth hormone products, Nutropin Depot, Nutropin AQ, Nutropin, and Protropin, increased 11% in the first quarter of 2004 from the comparable period in 2003. The net sales growth resulted from continued strong demand for the Nutropin products and, to a lesser extent, price increases. The price increase on a

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number of growth hormone products in October 2003 accounted for a significant portion of the growth in the first quarter of 2004 as compared to the first quarter of 2003. The continued strong demand reflects our focus on new patient starts using our Nutropin AQ Pen (which is a delivery system for Nutropin AQ), continued growth in the adult patient market, higher dosing during puberty and an incremental increase in the length of therapy. Nutropin Depot is a long-acting dosage form of recombinant growth hormone approved for pediatric growth hormone deficiency. Positive data results from our Nutropin Depot study in patients with adult growth hormone deficiency will be presented at a medical meeting in June 2004. Manufacture of Protropin was discontinued at the end of 2002 because physicians are typically initiating therapy with one of the Nutropin family products and the demand for Protropin has declined, but sales are expected to continue through 2004 or until inventory is depleted.

Combined net sales of our three thrombolytic products, Activase, TNKase and Cathflo Activase, decreased 3% in the first quarter of 2004 from the comparable period in 2003. Sales were impacted by continued competition from Centocor, Inc.'s Retavase® (reteplase) and adoption of mechanical reperfusion strategies to treat acute myocardial infarction. A price increase in February 2004 on certain thrombolytic products and higher sales of Cathflo Activase for catheter clearance partially offset the decline in overall sales volume.

However, competition and declines in the acute myocardial infarction market are expected to be offset by growth in the area of catheter clearance.

Net sales of Pulmozyme increased 10% in the first quarter of 2004 from the comparable period in 2003. This increase primarily reflects an increased focus on aggressive treatment of cystic fibrosis early in the course of the disease and, to a lesser extent, a price increase in August 2003.

We received FDA approval to market Xolair in June 2003 and began shipping Xolair in July 2003. Xolair achieved total net sales of $30.0 million in the first quarter of 2004, reflecting continued acceptance of the product and positive physician adoption rates. Future sales and related expenses are subject to risks and uncertainties, including continued physician adoption rates, third-party payer reimbursement and coverage decisions.

We received FDA approval to market Raptiva in October 2003 and began shipping Raptiva in November 2003. Raptiva achieved total net sales of $6.3 million in the first quarter of 2004, reflecting continued acceptance of the product and effective reimbursement processing. Future sales and the continued acceptance of this biologics class are subject to risks and uncertainties, including how well Raptiva is able to compete with other new and established therapies for moderate-to-severe psoriasis.

Royalty income increased 36% in the first quarter of 2004 from the comparable period in 2003. The increase was due to higher third-party sales by various licensees, primarily Hoffmann-La Roche (see "Related Party Transactions" below) for higher sales of Herceptin and Rituxan products, and to higher sales by various licensees for other products. We expect that in 2004 the increase in royalty income will be at a slower rate than 2003.

Cash flows from royalty income include revenues denominated in foreign currencies. We currently purchase simple foreign currency put option contracts (or options) and forwards to hedge these foreign royalty cash flows. The term of these options is generally one to five years. See the "We Are Exposed to Risks Relating to Foreign Currency Exchange Rates and Foreign Economic Conditions" section of the Forward-Looking Information below for a discussion of market risks related to these financial instruments.

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Contract revenues increased 51% in the first quarter of 2004 from the comparable period in 2003. The increase was primarily driven by revenues from our collaborators for amounts earned on development efforts related to Avastin, Rituxan and Lucentis. See "Related Party Transactions" below for more information on contract revenue from Hoffmann-La Roche and Novartis.

We expect that contract revenues will increase in 2004, but at a more modest pace than in 2003. We also expect contract revenues to fluctuate depending on the level of revenues earned for ongoing development efforts, the level of milestones received, the number of new contract arrangements and Hoffmann-La Roche's potential opt-ins for products.

Cost of sales (or COS) as a percentage of product sales was 15% and 19% in the first quarters of 2004 and 2003, respectively. This decrease primarily reflects higher sales of more favorable margin products (primarily sales of Rituxan and Herceptin, and to a lesser extent, sales of previously reserved products), lower royalty expenses and lower production costs due to manufacturing efficiencies primarily related to Herceptin. We do not expect this trend to continue and as such, our COS as a percentage of sales for the full year 2004 is expected to be higher than our first quarter of 2004 rate of 15%.

We entered into an arrangement with Lonza Biologics, a subsidiary of Lonza Group Ltd, to provide additional manufacturing capacity for Rituxan. We do not expect this arrangement to have a significant impact on our overall cost of sales as a percentage of product sales.

R&D expenses increased 21% in the first quarter of 2004 from the comparable period in 2003. This increase was largely due to higher spending on clinical development of products, including Lucentis, Rituxan and Omnitarg, partially offset by lower spending on Raptiva; increased post-marketing clinical studies for Raptiva, Avastin and Rituxan; and increased headcount and related expenses in support of research activities. We expect increases in R&D expenses over time to be driven mainly by the development of our pipeline products. Our expectations for higher revenues in the future will likely cause R&D as a percentage of operating revenues to decline over time.

The major components of R&D expenses for the quarters ended March 31, 2004 and 2003 were as follows (in millions):