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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, 2003

OR

Commission file number 000-12477

AMGEN INC.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code (805) 447-1000

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.  x

As of April 18, 2003, the registrant had 1,289,516,972 shares of common stock, $0.0001 par value, outstanding.

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AMGEN INC.

INDEX

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PART I—FINANCIAL INFORMATION

Item 1.     Financial Statements

The information in this report for the three months ended March 31, 2003 and 2002 is unaudited but includes all adjustments (consisting only of normal recurring accruals, unless otherwise indicated) which Amgen Inc., including its subsidiaries, (“Amgen” or the “Company”) considers necessary for a fair presentation of the results of operations for those periods.

The condensed consolidated financial statements should be read in conjunction with the Company’s financial statements and the notes thereto contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2002.

Interim results are not necessarily indicative of results for future quarters or the full fiscal year.

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AMGEN INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(In millions, except per share data)

(Unaudited)

See accompanying notes.

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AMGEN INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(In millions, except per share data)

(Unaudited)

See accompanying notes.

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AMGEN INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(In millions)

(Unaudited)

See accompanying notes.

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AMGEN INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2003

Business

Amgen Inc., including its subsidiaries, (“Amgen” or the “Company”) is a global biotechnology company that discovers, develops, manufactures, and markets human therapeutics based on advances in cellular and molecular biology.

Principles of consolidation

The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries as well as affiliated companies in which the Company has a controlling financial interest and exercises control over their operations (“majority controlled affiliates”). All material intercompany transactions and balances have been eliminated in consolidation. Investments in affiliated companies which are 50% or less owned and where the Company exercises significant influence over operations are accounted for using the equity method. All other equity investments are accounted for under the cost method. The caption “Earnings of affiliates, net” includes Amgen’s equity in the operating results of affiliated companies and the minority interest others hold in the operating results of Amgen’s majority controlled affiliates (see Note 7, “Acquisition of certain rights from Roche”). On July 15, 2002, the Company completed its acquisition of Immunex Corporation (“Immunex”) (see Note 3, “Immunex acquisition”). In accordance with Statement of Financial Accounting Standards (“SFAS”) No. 141, “Business Combinations”, Amgen has included in its results of operations for the three months ended March 31, 2003, the results of operations of Immunex.

Inventories

Inventories are stated at the lower of cost or market. Cost is determined in a manner which approximates the first-in, first-out (FIFO) method. Inventories consist of raw materials, work in process, and finished goods for currently marketed products. Inventories are shown net of applicable reserves and allowances. Inventories consisted of the following (in millions):

Intangible assets and goodwill

Intangible assets are recorded at cost, less accumulated amortization. Amortization of intangible assets is provided over their estimated useful lives ranging from 7 to 15 years on a straight-line basis. Goodwill is recorded net of accumulated amortization through December 31, 2001. In

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AMGEN INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

accordance with SFAS No. 142, “Goodwill and Other Intangible Assets”, goodwill is no longer amortized, but is subject to periodic impairment tests. As of March 31, 2003, intangible asset and goodwill balances, net of accumulated amortization were as follows (in millions):

Acquired product technology rights relate to the identifiable intangible assets acquired in connection with the Immunex acquisition. Amortization of acquired product technology rights is included in “Amortization of acquired intangible assets” in the accompanying condensed consolidated statements of operations. Other intangible assets primarily consist of rights related to the commercialization of certain products (see Note 7, “Acquisition of certain rights from Roche”). Amortization of other intangible assets is principally included in “Selling, general and administrative” expense in the accompanying condensed consolidated statements of operations.

Product sales

Product sales primarily consist of sales of EPOGEN^® (Epoetin alfa), Aranesp^® (darbepoetin alfa), NEUPOGEN^® (Filgrastim), Neulasta^™ (pegfilgrastim), and ENBREL^® (etanercept).

The Company has the exclusive right to sell Epoetin alfa for dialysis, certain diagnostics and all non-human, non-research uses in the United States. The Company sells Epoetin alfa under the brand name EPOGEN^®. Amgen has granted to Ortho Pharmaceutical Corporation (which has assigned its rights under the product license agreement to Ortho Biotech Products, L.P.), a subsidiary of Johnson & Johnson (“Johnson & Johnson”), a license relating to Epoetin alfa for sales in the United States for all human uses except dialysis and diagnostics. The license agreement, which is perpetual, can be terminated upon mutual agreement of the parties, or default. Pursuant to this license, the Company and Johnson & Johnson are required to compensate each other for Epoetin alfa sales that either party makes into the other party’s exclusive market, sometimes referred to as “spillover”. Accordingly, Amgen does not recognize product sales it makes into the exclusive market of Johnson & Johnson and does recognize the product sales made by Johnson & Johnson into Amgen’s exclusive market. Sales in Amgen’s exclusive market are derived from the Company’s sales to its customers, as adjusted for spillover. The Company is employing an arbitrated audit methodology to measure each party’s spillover based on estimates of and subsequent adjustments thereto of third-party data on shipments to end users and their usage.

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AMGEN INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Sales of the Company’s other products are recognized when shipped and title has passed. Product sales are recorded net of reserves for estimated discounts, incentives, and rebates.

Corporate partner revenues

Corporate partner revenues are primarily comprised of amounts earned from Kirin-Amgen, Inc. (“Kirin-Amgen”) for certain research and development (“R&D”) activities and are generally earned as the R&D activities are performed and the amounts become due. In addition, corporate partner revenues include license fees and milestone payments associated with collaborations with third parties. Revenue from non-refundable, upfront license fees where the Company has continuing involvement is recognized ratably over the development or agreement period. Revenue associated with performance milestones is recognized based upon the achievement of the milestones, as defined in the respective agreements. The Company’s collaboration agreements with third parties are performed on a “best efforts” basis with no guarantee of either technological or commercial success.

Royalty income

Royalties from licensees are based on third-party sales of licensed products and are recorded in accordance with contract terms when third-party results are reliably measurable and collectibility is reasonably assured. Royalty estimates are made in advance of amounts collected using historical and forecasted trends. Pursuant to the license agreement with Johnson & Johnson, noted above, the Company earns a 10% royalty on sales of Epoetin alfa by Johnson & Johnson in the United States

Research and development costs

Research and development expenses are comprised of the following types of costs incurred in performing R&D activities: salaries and benefits, allocated overhead and occupancy costs, clinical trial and related clinical manufacturing costs, contract services, and other outside costs. Research and development expenses also include such costs related to activities performed on behalf of corporate partners. Research and development costs are expensed as incurred.

Acquired in-process research and development

Costs to acquire in-process research and development (“IPR&D”) projects and technologies which have no alternative future use and which have not reached technological feasibility at the date of acquisition are expensed as incurred (see Note 3, “Immunex acquisition”). Acquired IPR&D is considered as part of total R&D expense.

Earnings per share

Basic earnings per share is based upon the weighted-average number of common shares outstanding. Diluted earnings per share is based upon the weighted-average number of common shares and dilutive potential common shares outstanding. Potential common shares are: 1) outstanding options under the Company’s employee stock option plans including stock option plans assumed from Immunex, 2) potential issuances of stock under the employee stock purchase plans including employee stock purchase plans assumed from Immunex, 3) restricted stock (collectively “Dilutive Securities” which are included under the treasury stock method when dilutive), and 4)

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AMGEN INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

common shares to be issued under the assumed conversion of outstanding 30-year, zero-coupon senior convertible notes which are included under the if-converted method when dilutive (see Note 6, “Debt”).

The following table sets forth the computation for basic and diluted earnings per share (in millions, except per share information):

Employee stock option and stock purchase plans

The Company accounts for its employee stock option and stock purchase plans under the recognition and measurement principles of Accounting Principles Board Opinion (“APB”) No. 25, “Accounting for Stock Issued to Employees,” and related Interpretations. Under APB No. 25, no stock-based compensation is reflected in net income, as all options granted under the plans had an exercise price equal to the market value of the underlying common stock on the date of grant and the related number of shares granted is fixed at that point in time. The following table illustrates the effect on net income and earnings per share if the Company had applied the fair value recognition provisions of SFAS No. 123, “Accounting for Stock-Based Compensation”:

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AMGEN INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

The fair value of the options was estimated at the date of grant using a Black-Scholes option valuation model with the following weighted-average assumptions for the three months ended March 31, 2003 and 2002, respectively: 1) a risk-free interest rate of 2.2% and 3.2%, 2) a dividend yield of 0% and 0%, 3) a volatility factor of the expected market price of the Company’s common stock of 50% and 50%, and 4) an expected life of the options of 3.6 years and 3.0 years. These assumptions resulted in weighted-average fair values of $20.59 and $20.31 per share for employee stock options granted during the three months ended March 31, 2003 and 2002, respectively.

The Black-Scholes option valuation model was developed for use in estimating the fair value of traded options. The Company’s employee stock options have characteristics significantly different from those of traded options such as extremely limited transferability and, in most cases, vesting restrictions. In addition, the assumptions used in option valuation models (see above) are highly subjective, particularly the expected stock price volatility of the underlying stock. Because changes in these subjective input assumptions can materially affect the fair value estimate, in management’s opinion, existing valuation models do not provide a reliable, single measure of the fair value of its employee stock options. For purposes of pro forma disclosures, the estimated fair values of the options are amortized over the options’ vesting periods.

Use of estimates

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

Recent accounting pronouncements

In December 2002, the Financial Accounting Standards Board (“FASB”) issued SFAS No. 148, “Accounting for Stock-Based Compensation – Transition and Disclosure”, effective for fiscal years ending after December 15, 2002. This rule amends SFAS No. 123 to provide several alternatives for adopting the stock option expense provisions of SFAS No. 123, as well as additional required interim financial statement disclosures. SFAS No. 148 does not require companies to expense stock options in

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AMGEN INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

current earnings. The Company has not adopted the provisions of SFAS No. 123 for expensing stock based compensation (see “— Employee stock option and stock purchase plans”); however, the Company has adopted the additional interim disclosure provisions of the statement. The impact of the new standard is not expected to have a material impact on the results of operations or the financial position of the Company.

In January 2003, the FASB issued FASB Interpretation No. 46, “Consolidation of Variable Interest Entities”, effective as of the first interim period beginning after June 15, 2003. The impact upon adoption of the standard is not expected to have a material impact on the results of operations or the financial position of the Company.

Basis of presentation

The financial information for the three months ended March 31, 2003 and 2002 is unaudited but includes all adjustments (consisting only of normal recurring accruals, unless otherwise indicated) which the Company considers necessary for a fair presentation of the results of operations for these periods. Interim results are not necessarily indicative of results for the full fiscal year.

Reclassification

Certain prior year amounts have been reclassified to conform to the current year presentation.

The Company owns a 50% interest in Kirin-Amgen, a corporation formed in 1984 with Kirin Brewery Company, Limited (“Kirin”) for the development and commercialization of certain products based on advanced biotechnology. Kirin-Amgen has given exclusive licenses to Amgen to manufacture and market certain products including erythropoietin, granulocyte colony-stimulating factor (“G-CSF”), darbepoetin alfa, and pegfilgrastim in certain geographic areas of the world. The Company currently markets certain of these products under the brand names EPOGEN^® (erythropoietin), NEUPOGEN^® (G-CSF), Aranesp^® (darbepoetin alfa), and Neulasta^™ (pegfilgrastim). Kirin-Amgen’s revenues primarily consist of royalty income related to its licensed technology rights. Kirin-Amgen receives royalty income from Amgen, as well as Kirin, Johnson & Johnson, F. Hoffmann-La Roche Ltd (“Roche”), and others under separate product license agreements for certain geographic areas outside of the United States. During the three months ended March 31, 2003 and 2002, Kirin-Amgen earned royalties from Amgen of $45.3 million and $35.2 million, respectively, which are included in “Cost of sales” in the accompanying condensed consolidated statements of operations.

Kirin-Amgen’s expenses primarily consist of costs related to research and development activities conducted on its behalf by Amgen and Kirin. Kirin-Amgen pays Amgen and Kirin for such services at negotiated rates. During the three months ended March 31, 2003 and 2002, Amgen earned revenues from Kirin-Amgen of $26.3 million and $25.2 million, respectively, for certain research and development activities performed on Kirin-Amgen’s behalf, which are included in “Corporate partner revenues” in the accompanying condensed consolidated statements of operations.

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AMGEN INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

On July 15, 2002, the Company acquired all of the outstanding common stock of Immunex in a transaction accounted for as a business combination. Immunex was a leading biotechnology company dedicated to developing immune system science to protect human health. The acquisition of Immunex is expected to further advance Amgen’s role as a global biotechnology leader with the benefits of accelerated growth and increased size, product base, product pipeline, and employees. The acquisition is also intended to enhance Amgen’s strategic position within the biotechnology industry by strengthening and diversifying its (1) product base and product pipeline in key therapeutic areas, and (2) discovery research capabilities in proteins and antibodies. The results of Immunex’s operations have been included in the condensed consolidated financial statements commencing July 16, 2002.

Each share of Immunex common stock outstanding at July 15, 2002 was converted into 0.44 of a share of Amgen common stock and $4.50 in cash. As a result, Amgen issued approximately 244.6 million shares of common stock and paid approximately $2.5 billion in cash to former Immunex shareholders. Amgen also paid Wyeth $25 million at the closing of the merger for the termination of certain Immunex product rights in favor of Wyeth, as specified in the agreement regarding governance and commercial matters. In addition, each employee stock option to purchase Immunex common stock outstanding at July 15, 2002 was assumed by Amgen and converted into an option to purchase Amgen common stock based on the terms specified in the merger agreement. As a result, approximately 22.4 million options to purchase Amgen common stock were assumed, on a converted basis. The acquisition is expected to qualify as a tax-free reorganization within the meaning of Section 368(a) of the Internal Revenue Code.

The purchase price of the acquisition was (in millions):

The value of the Amgen shares used in determining the purchase price was $58.525 per share based on the average of the closing prices of Amgen common stock for a range of four trading days, two days prior to and two days subsequent to the announcement of the merger. The fair values of stock options issued were also determined based on the $58.525 stock price using the Black-Scholes method assuming an expected weighted average life of 1.5 years, weighted average risk-free rate of 2.1%, volatility of 50%, and no expected dividends.

Purchase price allocation

The purchase price was allocated to the tangible and identifiable intangible assets acquired and liabilities assumed based on their estimated fair values at the acquisition date. The excess of the purchase price over the fair values of assets and liabilities acquired amounted to $9,776.3 million and

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AMGEN INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

was allocated to goodwill. The Company expects that substantially all of the amount allocated to goodwill will not be deductible for tax purposes.

The following table summarizes the preliminary estimated fair values of the assets acquired and liabilities assumed as of the acquisition date (in millions):

The allocation of the purchase price was based, in part, on a third-party valuation of the fair values of in-process research and development, identifiable intangible assets, and certain property, plant, and equipment. The purchase price allocation will remain preliminary until Amgen completes its evaluation of the various restructuring plans undertaken following the consummation of the merger, as discussed below. The final determination of the purchase price allocation is expected to be completed as soon as practicable after the consummation of the acquisition.

In the first quarter of 2003, goodwill increased by $2.4 million principally due to the impact of adjusting amounts previously accrued under the Company’s various restructuring plans (see “—Restructuring plans” below).

In-process research and development

Approximately $2,991.8 million of the purchase price represents the estimated fair value of projects that, as of the acquisition date, had not reached technological feasibility and had no alternative future use. Accordingly, this amount was immediately expensed in the consolidated statement of operations during the three months ended September 30, 2002. The estimated fair values assigned to IPR&D is comprised of the following projects by therapeutic area (in millions):

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AMGEN INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

The estimated fair value of these projects was determined based on the use of a discounted cash flow model. For each project, the estimated after-tax cash flows were probability weighted to take into account the stage of completion and the risks surrounding the successful development and commercialization. These cash flows were then discounted to a present value using discount rates ranging from 12% to 14%. In addition, solely for the purposes of estimating the fair values of these IPR&D projects as of July 15, 2002, the following assumptions were made:

The major risks and uncertainties associated with the timely and successful completion of these projects consist of the ability to confirm the safety and efficacy of the technology based on the data from clinical trials and obtaining necessary regulatory approvals. In addition, no assurance can be given that the underlying assumptions used to forecast the cash flows or the timely and successful completion of such projects will materialize, as estimated. For these reasons, among others, actual results may vary significantly from the estimated results.

Identifiable intangible assets

Acquired identifiable intangible assets primarily relate to ENBREL^® and include product rights for approved indications of currently marketed products and core technology. The amounts assigned to each intangible asset class as of the acquisition date and the weighted average amortization periods are as follows (amounts in millions):

Leukine^® and Novantrone^®

In May 2002, Immunex entered into an agreement to sell certain assets used in connection with its Leukine^® business to Schering AG Germany (“Schering”) for approximately $389.9 million in cash plus the payment of additional cash consideration upon achievement of certain milestones. The sale of the Leukine^® business was pursued in connection with Amgen’s acquisition of Immunex and was completed on July 17, 2002.

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AMGEN INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

In December 2002, the Company licensed the commercialization rights for Novantrone^® in the United States to Serono S.A. for royalties based on future product sales.

Pro forma results of operations

The following unaudited pro forma information for the three months ended March 31, 2002 presents a summary of the Company’s consolidated results of operations as if the Immunex acquisition had taken place at the beginning of 2002 (in millions, except per share information):

The pro forma net income and earnings per share for the three months ended March 31, 2002 exclude the acquired IPR&D charge noted above. The pro forma information is not necessarily indicative of results that would have occurred had the acquisition been in effect for the periods presented or indicative of results that may be achieved in the future.

The impact of the Leukine^® sale noted above is reflected in the Company’s purchase price allocation as of July 15, 2002. However, for antitrust reasons, information regarding the results of operations attributable to Leukine^® is not reviewable by Amgen, and therefore, has not been excluded from the pro forma results of operations for the three months ended March 31, 2002. Leukine^® sales for the three months ended March 31, 2002 were $28.6 million.

Restructuring plans

In connection with the Immunex acquisition, the Company initiated an integration plan to consolidate and restructure certain functions and operations of the pre-acquisition Immunex primarily consisting of the termination and relocation of certain Immunex personnel, termination of certain duplicative and non-strategic Immunex R&D programs, and consolidation of certain Immunex leased facilities. These costs have been recognized as liabilities assumed in the purchase business combination in accordance with EITF Issue No. 95-3 “Recognition of Liabilities in Connection with Purchase Business Combinations” and reflected as an increase to goodwill. The following table summarizes the liabilities established as a result of the acquisition and payments made through March 31, 2003 (in millions):

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AMGEN INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Stock repurchase program

The Company has a stock repurchase program primarily to reduce the dilutive effect of its employee stock option and stock purchase plans. Stock repurchased under the program is intended to be retired. During the three months ended March 31, 2003, the Company repurchased 8.2 million shares of its common stock at a total cost of $450.6 million. In June 2002, the Board of Directors authorized the Company to repurchase up to an additional $2.0 billion of common stock through June 30, 2004. At the time of the additional authorization, the Company had approximately $257.1 million remaining under the previous authorized stock repurchase program. The amount the Company spends on and the number of shares repurchased varies based on a variety of factors, including the stock price and blackout periods in which the Company is restricted from repurchasing shares. As of March 31, 2003, $1,391.5 million was available for stock repurchases through June 30, 2004.

Other comprehensive income

SFAS No. 130, “Reporting Comprehensive Income”, requires unrealized gains/losses on the Company’s available-for-sale securities and foreign currency forward contracts which qualify and are designated as cash flow hedges, and foreign currency translation adjustments to be included in other comprehensive income. During the three months ended March 31, 2003 and 2002, total comprehensive income was $470.5 million and $315.9 million, respectively.

The tax rate for the three months ended March 31, 2003 is different from the statutory rate primarily as a result of permanently reinvested earnings of the Company’s foreign operations. The Company does not provide for U.S. income taxes on undistributed earnings of its foreign operations that are intended to be permanently reinvested.

The Company’s income tax returns are routinely audited by the Internal Revenue Service and various state tax authorities. While disputes may arise with these tax authorities, some of which may be significant, the Company believes that adequate tax liabilities have been established for all open audit years.

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AMGEN INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Commercial Paper

The Company has a commercial paper program which provides for unsecured, short-term borrowings up to an aggregate of $200 million. At December 31, 2002, commercial paper with a face amount of $100 million was outstanding. These borrowings had maturities of less than one month and had effective interest rates averaging 1.4%. The Company paid off all amounts outstanding under its commercial paper program as of March 31, 2003.

Convertible Notes

On March 1, 2002, the Company issued $3.95 billion in aggregate face amount at maturity ($1,000 face amount per note) of 30-year, zero-coupon senior convertible notes (the “Convertible Notes”) with a yield to maturity of 1.125%. The gross proceeds from the offering were approximately $2.82 billion (a $714.23 per note original issue price). The original issue discount of $1.13 billion (or $285.77 per note) is being accreted to interest expense over the life of the Convertible Notes using the effective interest method. Debt issuance costs were approximately $56.5 million and are being amortized on a straight-line basis over the life of the notes.

Holders of the Convertible Notes may convert each of their notes into 8.8601 shares of common stock of the Company (the “conversion rate”) at any time on or before the maturity date, or approximately 35.0 million shares in the aggregate. The conversion price per share at issuance was $80.61. The conversion price per share as of any day will equal the original issuance price plus the accrued original issue discount to that day, divided by the conversion rate, or $81.60 per share as of March 31, 2003. The holders of the Convertible Notes may require the Company to purchase all or a portion of their notes on March 1, 2005, March 1, 2007, March 1, 2012, and March 1, 2017 at a price equal to the original issuance price plus the accrued original issue discount to the purchase dates. The Company may choose to pay the purchase price in cash and/or shares of common stock.

The Company may redeem all or a portion of the Convertible Notes for cash at any time on or after March 1, 2007 at the original issuance price plus accrued original issue discount as of the redemption date. In addition, the Company will pay contingent cash interest during any six-month period commencing on or after March 2, 2007 if the average market price of a note for a five trading day measurement period preceding the applicable six-month period equals 120% or more of the sum of the original issuance price and accrued original issue discount for such note. The contingent cash interest in respect of any quarterly period will equal the greater of 1) the amount of regular cash dividends paid by the Company per share multiplied by the number of shares of common stock deliverable upon conversion of the Convertible Notes at the then applicable conversion rate or 2) 0.0625% of the average market price of a note for a five trading day measurement period preceding the applicable six-month period provided, that if the Company does not pay cash dividends during a semiannual period it will pay contingent interest semiannually at a rate of 0.125% of the average market price of a note for a five trading day measurement period.

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AMGEN INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

In May 2002, the Company acquired certain rights related to the commercialization of NEUPOGEN^® and GRANULOKINE^® (Filgrastim) and pegfilgrastim in the European Union (“EU”), Switzerland, and Norway from Roche. Amgen paid $137.5 million for such rights. The purchase price of the rights was capitalized and will be amortized on a straight-line basis over the useful life of the rights acquired, estimated to be 15 years. Prior to this acquisition, NEUPOGEN^® and GRANULOKINE^® were commercialized in the EU under a co-promotion agreement between Amgen and Roche. Roche will continue as the licensee for Filgrastim and pegfilgrastim in certain countries outside the United States and the EU.

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

Immunex Acquisition

On July 15, 2002, the Company acquired all of the outstanding common stock of Immunex Corporation (“Immunex”) in a transaction accounted for as a business combination. Immunex was a leading biotechnology company dedicated to developing immune system science to protect human health. The acquisition of Immunex is expected to further advance Amgen’s role as a global biotechnology leader with the benefits of accelerated growth and increased size, product base, product pipeline, and employees. The acquisition is also intended to enhance Amgen’s strategic position within the biotechnology industry by strengthening and diversifying its (1) product base and product pipeline in key therapeutic areas, and (2) discovery research capabilities in proteins and antibodies.

Each share of Immunex common stock outstanding at July 15, 2002 was converted into 0.44 of a share of Amgen common stock and $4.50 in cash. As a result, Amgen issued approximately 244.6 million shares of common stock and paid approximately $2.5 billion in cash to former Immunex shareholders. Amgen also paid Wyeth $25 million at the closing of the merger for the termination of certain Immunex product rights in favor of Wyeth, as specified in the agreement regarding governance and commercial matters. In addition, each employee stock option to purchase Immunex common stock outstanding at July 15, 2002 was assumed by Amgen and converted into an option to purchase Amgen common stock based on the terms specified in the merger agreement. As a result, approximately 22.4 million options to purchase Amgen common stock were assumed, on a converted basis. The acquisition was structured to qualify as a tax-free reorganization within the meaning of Section 368(a) of the Internal Revenue Code.

Unless otherwise indicated, the discussions in this report of the results of operations for the three months ended March 31, 2003 and financial condition at March 31, 2003 include the results of operations of Immunex. Comparisons are made to the results of operations for the three months ended March 31, 2002, which include only the historical results of Amgen.

Liquidity and Capital Resources

Cash, cash equivalents, and marketable securities

The Company had cash, cash equivalents, and marketable securities of $4,757.0 million and $4,663.9 million at March 31, 2003 and December 31, 2002, respectively. Of the total cash, cash equivalents, and marketable securities at March 31, 2003, approximately $2.3 billion represents cash generated from operations in foreign tax jurisdictions and is intended for use in such foreign operations (see “Results of Operations- Income taxes”). If these funds are repatriated for use in the Company’s U.S. operations, additional taxes on certain of these amounts would be required to be paid. The Company does not currently anticipate a need to repatriate these funds to the United States.

The primary objectives for the Company’s fixed income investment portfolio are liquidity and safety of principal. Investments are made to achieve the highest rate of return to the Company,

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consistent with these two objectives. The Company’s investment policy limits investments to certain types of instruments issued by institutions with investment grade credit ratings and places restrictions on maturities and concentration by type and issuer.

Cash flows

Cash provided by operating activities has been and is expected to continue to be the Company’s primary recurring source of funds. During the three months ended March 31, 2003, operations provided $780.8 million of cash compared with $486.9 million during the same period last year. The increase in cash provided by operating activities during the three months ended March 31, 2003 resulted primarily from higher earnings, excluding depreciation and amortization.

Capital expenditures totaled $268.2 million for the three months ended March 31, 2003 compared with $82.0 million for the same period a year ago. The increase in capital expenditures during the three months ended March 31, 2003 resulted primarily from capital expenditures related to the Puerto Rico manufacturing expansion, the Seattle research center, and the new Rhode Island manufacturing facility.

The Company receives cash from the exercise of employee stock options and proceeds from the sale of stock by Amgen pursuant to the employee stock purchase plans. During the three months ended March 31, 2003, employee stock option exercises and proceeds from the sale of stock by Amgen pursuant to the employee stock purchase plans provided $136.0 million of cash compared with $79.5 million for the same period last year. Proceeds from the exercise of employee stock options will vary from period to period based upon, among other factors, fluctuations in the market value of the Company’s stock relative to the exercise price of such options.

The Company has a stock repurchase program primarily to reduce the dilutive effect of its employee stock option and stock purchase plans. During the three months ended March 31, 2003, the Company repurchased 8.2 million shares of its common stock at a total cost of $450.6 million compared with 12.5 million shares purchased at a cost of $715.3 million during the same period last year. Stock repurchased during the three months ended March 31, 2002 includes 11.3 million shares of common stock repurchased simultaneously with the issuance of the 30-year, zero-coupon senior convertible notes (the “Convertible Notes”) discussed below at a total cost of $650 million. In June 2002, the Board of Directors authorized the Company to repurchase up to an additional $2.0 billion of common stock through June 30, 2004. At the time of the additional authorization, the Company had approximately $257.1 million remaining under the previous authorized stock repurchase program. The amount the Company spends on and the number of shares repurchased varies based on a variety of factors, including the stock price and blackout periods in which the Company is restricted from repurchasing shares. As of March 31, 2003, $1,391.5 million was available for stock repurchases through June 30, 2004.

Debt financing

In March 2002, the Company issued $3.95 billion in aggregate face amount at maturity of Convertible Notes with a yield to maturity of 1.125%. The gross proceeds from the offering were approximately $2.82 billion. The original issue discount of $1.13 billion is being accreted to interest expense over the life of the Convertible Notes using the effective interest method. Debt issuance costs were approximately $56.5 million and are being amortized on a straight-line basis over the life of the notes. The holders of the Convertible Notes may require the Company to purchase all or a

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portion of their notes on March 1, 2005, March 1, 2007, March 1, 2012, and March 1, 2017 at a price equal to the original issuance price plus the accrued original issue discount to the purchase dates. In such event, the Company may choose to pay the purchase price in cash and/or shares of common stock (see Note 6, “Debt” to the condensed consolidated financial statements).

To provide for financial flexibility and increased liquidity, the Company has established several other sources of debt financing. As of March 31, 2003, the Company had $200 million of unsecured long-term debt securities outstanding. These unsecured long-term debt securities consisted of: 1) $100 million of debt securities that bear interest at a fixed rate of 6.5% and mature in 2007 under a $500 million debt shelf registration (the “Shelf”), and 2) $100 million of debt securities that bear interest at a fixed rate of 8.1% and mature in 2097. In addition, the Company has $23 million of debt securities that bear interest at a fixed rate of 6.2% and mature in 2003, which are classified as current liabilities. The Company’s outstanding long-term debt is rated A2 by Moody’s and A+ by Standard & Poor’s. Under the Shelf, all of the remaining $400 million of debt securities available for issuance may be offered from time to time with terms to be determined by market conditions.

The Company’s sources of debt financing also include a commercial paper program which provides for unsecured short-term borrowings up to an aggregate face amount of $200 million. During the three months ended March 31, 2003, the Company repaid all of the outstanding balances under the Commercial paper program, totaling $100 million. In addition, the Company has an unsecured $150 million committed credit facility with five participating banking institutions that expires on May 28, 2003. This credit facility supports the Company’s commercial paper program. As of March 31, 2003, no amounts were outstanding under this line of credit.

The Company believes that existing funds, cash generated from operations, and existing sources of debt financing are adequate to satisfy its working capital and capital expenditure requirements for the foreseeable future, as well as to support its stock repurchase program (see “Financial Outlook- Liquidity and capital resources”). However, the Company may raise additional capital from time to time.

Results of Operations

Product sales

Product sales for the three months ended March 31, 2003 primarily consisted of sales of EPOGEN^® (Epoetin alfa), Aranesp^® (darbepoetin alfa), NEUPOGEN^® (Filgrastim), Neulasta^™ (pegfilgrastim), and ENBREL^® (etanercept). Product sales are influenced by a number of factors, including demand, wholesaler inventory management practices, foreign exchange effects, new product launches, and acquisitions.

For the three months ended March 31, 2003, product sales were $1,635.9 million, an increase of $727.3 million or 80% over the same period last year. This increase was principally driven by ENBREL^®, Neulasta^™, and Aranesp^® sales. Product sales for the three months ended March 31, 2003, excluding ENBREL^®, were $1,361.9 million, an increase of $453.3 million or 50% over the same period last year. U.S. product sales for the three months ended March 31, 2003 were $1,427.5 million, an increase of $608.4 million or 74% over the same period last year. International sales for the three months ended March 31, 2003 were $208.4 million, an increase of $118.9 million or 133% over the

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same period last year. Excluding the beneficial impact of foreign currency exchange rates, international sales increased 97% for the three months ended March 31, 2003. For the three months ended March 31, 2003 and 2002, sales by product and geographic region were as follows (in millions):

EPOGEN^®/Aranesp^®

In June 2001, the Company received approval to market Aranesp^® in most countries in Europe, Australia, and New Zealand for the treatment of anemia associated with chronic renal failure, including patients on dialysis and patients not on dialysis. In September 2001, Amgen received approval in the United States for the same indication. In July 2002, the Company received U.S. Food and Drug Administration (“FDA”) approval to market Aranesp^® for the treatment of chemotherapy-induced anemia in patients with non-myeloid malignancies. In August 2002, the European Commission approved Aranesp^® for the treatment of anemia in adult cancer patients with solid tumors receiving chemotherapy. Aranesp^® was launched in several countries in Europe for this indication.

Combined EPOGEN^® and Aranesp^® sales for the three months ended March 31, 2003 were $801.9 million, an increase of $250.5 million or 45% over combined sales for the same period last year. This increase in combined sales was primarily driven by Aranesp^® sales. EPOGEN^® sales for the three months ended March 31, 2003 were $547.1 million, an increase of $34.9 million or 7% over EPOGEN^® sales for the same period last year. The growth in reported EPOGEN^® sales was due to a favorable revised estimate of dialysis demand for 2002, which the Company refers to as spillover (see Note 1, “Summary of significant accounting policies— Product sales” and “Summary of Critical Accounting Policies—EPOGEN^® revenue recognition”). This revised estimate was based on independent data and indicated that dialysis use for Epoetin alfa was greater in 2002 than initially estimated. During the three months ended March 31, 2003, EPOGEN^® demand declined slightly from the same period last year.

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Worldwide Aranesp^® sales for the three months ended March 31, 2003 were $254.8 million. Aranesp^® sales in the United States for the three months ended March 31, 2003 were $157.9 million. The increase in U.S. Aranesp^® sales over the same period last year was principally driven by demand, reflecting the mid-year 2002 approval of Aranesp^® for the treatment of chemotherapy-induced anemia, and to a lesser extent, favorable wholesaler inventory changes. International Aranesp^® sales were $96.9 million. The increase in international Aranesp^® sales over the same period last year was principally driven by demand, and to a lesser extent, favorable changes in foreign currency exchange rates.

NEUPOGEN^®/Neulasta^™

The Company launched Neulasta^™ in the United States in April 2002 to decrease the incidence of infection, as manifested by febrile neutropenia in patients with non-myeloid malignancies receiving myelosuppressive anti-cancer drugs associated with a clinically significant incidence of febrile neutropenia. In August 2002, the European Commission approved Neulasta^™ for the reduction in the duration of neutropenia and the incidence of febrile neutropenia in patients with cytotoxic chemotherapy for malignancy. In January 2003, the Company commenced launching Neulasta^™ in Europe on a country-by-country basis as reimbursement was established.

Combined worldwide Neulasta^™ and NEUPOGEN^® sales for the three months ended March 31, 2003 were $541.9 million, an increase of $186.9 million or 53%, over NEUPOGEN^® only sales for the same period last year. The Company believes that the increase in combined sales for Neulasta^™ and NEUPOGEN^® for the three months ended March 31, 2003 was primarily driven by demand for Neulasta^™, which reflects the conversion of NEUPOGEN^® patients to Neulasta^™ in the United States and to a lesser extent, patient population growth. Worldwide Neulasta^™ sales for the three months ended March 31, 2003 were $257.9 million.

Worldwide NEUPOGEN^® sales for the three months ended March 31, 2003 were $284.0 million, a decrease of $71.0 million or 20% over the same period last year. For the three months ended March 31, 2003, U.S. NEUPOGEN^® sales were $194.0 million, a decrease of $86.7 million or 31% over sales for the same period last year. This decrease was primarily due to a decline in U.S. NEUPOGEN^® demand of approximately 30% primarily due to the conversion of patients from NEUPOGEN^® to Neulasta^™ (see “Financial Outlook- Trends expected to impact future operations”). For the three months ended March 31, 2003, international NEUPOGEN^® sales were $90.0 million, an increase of $15.7 million or 21% over international NEUPOGEN^® sales in the same period last year. The increase in international NEUPOGEN^® sales is principally due to favorable changes in foreign currency exchange rates, and to a lesser extent, higher demand.

ENBREL^®

ENBREL^® sales for the three months ended March 31, 2003 were $274.0 million. The Company believes that as ENBREL^® supply increased following FDA approval of the Rhode Island manufacturing facility, additional demand was met. ENBREL^® demand was primarily driven by the addition of new patients, the transition of patients off the prospective patient list onto the product, and to a lesser extent, the conversion of some Radius II trial patients from clinical trial product to commercial drug.

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Royalty income

The majority of royalty income earned by Amgen relates to amounts received from sales of Epoetin alfa by Johnson & Johnson in the United States for use in non-dialysis settings. Additionally in December 2002, the Company licensed the commercialization rights for Novantrone^® in the United States to Serono S.A. for royalties based on future product sales. Royalty income was $91.4 million for the three months ended March 31, 2003, an increase of $23.0 million or 34% over the same period last year. This increase was principally due to royalties earned from Serono S.A. relating to its sales of Novantrone^® and, to a lesser extent, higher royalties earned from Johnson & Johnson relating to its sales of Epoetin alfa.

Cost of sales

Cost of sales for the three months ended March 31, 2003 were $283.3 million. The increase in cost of sales over the same period last year was primarily due to increased sales and the shift in product mix principally due to ENBREL^®. Cost of sales as a percentage of product sales was 17.3% and 11.4% for the three months ended March 31, 2003 and 2002, respectively. This increase was principally due to the inclusion of ENBREL^®. ENBREL^® has higher manufacturing costs and royalty expense compared to Amgen’s other products. Additionally, manufacturing costs of the Rhode Island production facility are greater than those of the Company’s contract manufacturer. Also, to a lesser extent, the Company’s newly launched products increased cost of sales as a percentage of sales due to higher costs compared to the Company’s core products, EPOGEN^® and NEUPOGEN^®. Cost of sales for the three months ended March 31, 2003 includes approximately $4.9 million of compensation costs payable under the Immunex Corporate Retention Plan.

Research and development

During the three months ended March 31, 2003, research and development (“R&D”) expenses increased $147.9 million or 73% over the same period last year primarily due to higher staff-related costs and higher outside R&D costs, principally clinical trials, and to a lesser extent, higher clinical manufacturing costs. This increase was due in part to the Immunex acquisition. During the three months ended March 31, 2003, staff-related costs and outside R&D costs increased approximately $66 million and $61 million, respectively, excluding the impact of clinical manufacturing activities. During the three months ended March 31, 2003, clinical manufacturing costs increased approximately $21 million. Staff-related costs for the three months ended March 31, 2003 includes approximately $9.7 million of compensation costs payable under the Immunex Corporate Retention Plan.

Selling, general and administrative

During the three months ended March 31, 2003, selling, general and administrative (“SG&A”) expenses increased $144.3 million or 59% over the same period last year. This increase was primarily due to higher staff-related costs and outside marketing expenses in support of ENBREL^®, the Wyeth profit share, and support of new product launches. During the three months ended March 31, 2003, staff-related costs increased approximately $72 million, including $4.8 million of compensation costs payable under the Immunex Corporate Retention Plan, and outside marketing expenses increased approximately $71 million.

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Amortization of intangible assets

During the three months ended March 31, 2003, amortization expense related to the intangible assets acquired in connection with the Immunex acquisition was $83.9 million. Amortization of intangible assets is provided over their estimated useful lives ranging from 7 to 15 years on a straight-line basis.

Interest and other income, net

During the three months ended March 31, 2003, interest and other income, net decreased $10.9 million or 25% from the same period last year. This decrease was primarily due to lower realized gains on investments.

Income taxes

The Company’s effective tax rate for the three months ended March 31, 2003 was 28.3%, compared with 31.0% for the same period last year.

During 2002, the company restructured its Puerto Rico manufacturing operations using a controlled foreign corporation. As permitted in APB 23, the company does not provide U.S. income taxes on the controlled foreign corporation’s undistributed earnings that are intended to be permanently reinvested outside the U.S. In addition, the Puerto Rico manufacturing operations were entitled to a possession tax credit for a portion of 2002.

The Company’s effective tax rate for the three months ended March 31, 2003 has decreased primarily due to an increase in the amount of permanently reinvested foreign earnings and amortization expense of acquired intangible assets partially offset by the loss of the possession tax credit.

Summary of Critical Accounting Policies

The preparation of the Company’s consolidated financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and the notes to the financial statements. Some of those judgments can be subjective and complex, and therefore actual results could differ materially from those estimates under different assumptions or conditions.

EPOGEN^® revenue recognition

The Company has the exclusive right to sell Epoetin alfa for dialysis, certain diagnostics, and all non-human, non-research uses in the United States. Amgen has granted to Johnson & Johnson a license relating to Epoetin alfa for sales in the United States for all human uses except dialysis and diagnostics. Pursuant to this license, the Company and Johnson & Johnson are required to compensate each other for Epoetin alfa sales that either party makes into the other party’s exclusive market, sometimes referred to as “spillover”. Accordingly, Amgen does not recognize product sales it makes into the exclusive market of Johnson & Johnson and does recognize the product sales made by Johnson & Johnson into Amgen’s exclusive market. Sales in Amgen’s exclusive market are derived from the Company’s sales to its customers, as adjusted for spillover. The Company is

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employing an arbitrated audit methodology to measure each party’s spillover based on independent third-party data on shipments to end users and their estimated usage. Data on end user usage is derived in part using market sampling techniques, and accordingly, the results of such sampling can produce variability in the amount of recognized spillover. The Company initially recognizes spillover based on estimates of shipments to end users and their usage, utilizing historical third-party data and subsequently adjusts such amounts based on revised third-party data as received. Differences between initial estimates of spillover and amounts based on revised third-party data could produce materially different amounts for recognized EPOGEN^® sales. However, such differences to date have not been material to the consolidated financial statements.

Immunex purchase price allocation

The purchase price for Immunex was allocated to the tangible and identifiable intangible assets acquired and liabilities assumed based on their estimated fair values at the acquisition date. An independent third-party valuation firm was engaged to assist in determining the fair values of in-process research and development, identifiable intangible assets, and certain property, plant, and equipment. Such a valuation requires significant estimates and assumptions including but not limited to: determining the timing and expected costs to complete the in-process projects, projecting regulatory approvals, estimating future cash flows from product sales resulting from completed products and in-process projects, and developing appropriate discount rates and probability rates by project. The Company believes the fair values assigned to the assets acquired and liabilities assumed are based on reasonable assumptions. However, these assumptions may be incomplete or inaccurate, and unanticipated events and circumstances may occur. Additionally, estimates for the purchase price allocation may change as subsequent information becomes available.

Deferred income taxes

The Company’s effective tax rate reflects the impact of undistributed foreign earnings for which no U.S. taxes have been provided because such earnings are intended to be permanently reinvested in international operations based on the Company’s projected cash flow, working capital, and long-term investment requirements of its U.S. and foreign operations. If future events, including material changes in estimates of cash, working capital, and long-term investment requirements necessitate that certain assets associated with these earnings be repatriated to the United States, an additional tax provision and related liability would be required which could materially impact the Company’s effective future tax rate.

Financial Outlook

Liquidity and capital resources

The Company estimates spending on capital projects and equipment to be approximately $1.3 billion to $1.5 billion for 2003, which reflects higher spending on capital projects including the Puerto Rico manufacturing expansion, the Seattle research center, and the new Rhode Island manufacturing plant.

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Results of operations

In the future, the Company expects growth of its businesses to be driven by new products, primarily Aranesp^®, ENBREL^®, and Neulasta^™ (see “Forward looking statements and factors that may affect Amgen”).

EPOGEN^®

EPOGEN^® is approved in the United States for the treatment of anemia associated with chronic renal failure. The Company believes EPOGEN^® sales growth will come primarily from underlying patient population growth and to a lesser extent, by improving patient outcomes. Patients receiving treatment for end-stage renal disease are covered primarily under medical programs provided by the federal government. The Company believes future EPOGEN^® sales growth may also be affected by future changes in reimbursement rates or a change in the basis for reimbursement by the federal government. EPOGEN^® may compete with Aranesp^® in the United States as health care providers may use Aranesp^® to treat anemia associated with chronic renal failure instead of EPOGEN^®.

Aranesp^®

In 2001, Aranesp^® was approved in the United States, most countries in Europe, Australia, and New Zealand for the treatment of anemia associated with chronic renal failure, including patients on dialysis and patients not on dialysis. In July 2002, Aranesp^® was approved in the United States for the treatment of chemotherapy-induced anemia in patients with non-myeloid malignancies. In August 2002, Aranesp^® was approved in Europe for the treatment of anemia in adult cancer patients with solid tumors receiving chemotherapy. The Company has launched Aranesp^® in several European countries and will expand into other countries as reimbursement is finalized.

The Company believes future Aranesp^® sales growth will be dependent, in part, on such factors as: the effects of competitive products or therapies, penetration of existing and new market opportunities, and changes in foreign currency exchange rates. In addition, future worldwide Aranesp^® sales growth may be affected by cost containment pressures from governments and private insurers on health care providers, as well as the availability of reimbursement by third-party payors, including governments and private insurance plans. For example, effective January 1, 2003, the Centers for Medicare and Medicaid Services (“CMS”) instituted certain changes to its payment system that included a rule setting a significantly reduced reimbursement rate for Aranesp^® for Medicare patients in the hospital outpatient setting. While the Company believes that this new rule is based on inaccurate information, the Company cannot predict whether it will be successful in correcting inaccuracies underlying this rule, or if such reimbursement changes for Aranesp^® in this setting may impact reimbursement in other settings, by other payors, or for its other products. The hospital outpatient Medicare setting accounts for approximately 10% of U.S. revenues of Aranesp^®.

NEUPOGEN^®/Neulasta^™

In January 2002, Neulasta^™ was approved in the United States to decrease the incidence of infection, as manifested by febrile neutropenia in patients with non-myeloid malignancies receiving myelosuppressive anti-cancer drugs associated with a clinically significant incidence of febrile neutropenia. The Company launched Neulasta^™ in the United States in April 2002. In August 2002, Neulasta^™ was approved in Europe for the reduction in the duration of neutropenia and the

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incidence of febrile neutropenia in patients with cytotoxic chemotherapy for malignancy. In January 2003, the Company commenced launching Neulasta^™ in Europe on a country-by-country basis as reimbursement has been established.

NEUPOGEN^® is approved in the United States to: decrease the incidence of infection, as manifested by febrile neutropenia, in chemotherapy patients with non-myeloid malignancies (the same use for which Neulasta^™ is approved); to reduce the duration of neutropenia for patients undergoing myeloablative therapy followed by bone marrow transplantation; to reduce the incidence and duration of neutropenia-related consequences in patients with severe chronic neutropenia; for use in mobilization of peripheral blood progenitor cells for stem cell transplantation; and to reduce the recovery time of neutrophils and the duration of fever following chemotherapy treatment in patients being treated for acute myelogenous leukemia. NEUPOGEN^® is approved in Europe, Canada, and Australia for these same indications as well as for the treatment of neutropenia in HIV patients receiving antiviral and/or other myelosuppressive medications.

The Company believes future NEUPOGEN^® and Neulasta^™ sales growth will depend on penetration of existing markets, the conversion of NEUPOGEN^® patients to Neulasta^™, patient population growth, price increases, the effects of competitive products or therapies, the development of new treatments for cancer, and changes in foreign currency exchange rates. In addition, future worldwide sales growth may be affected by cost containment pressures from governments and private insurers on health care providers, as well as the availability of reimbursement by third-party payors, including governments and private insurance plans. Further, chemotherapy treatments that are less myelosuppressive may require less NEUPOGEN^®/Neulasta^™. NEUPOGEN^® competes with Neulasta^™ in the United States and Europe. The Company believes that U.S. NEUPOGEN^® sales have and will continue to be adversely impacted by the launch of Neulasta^™, however the Company cannot accurately predict the extent to which healthcare providers will use Neulasta^™ instead of NEUPOGEN^® or the timing or rate of this conversion.

ENBREL^®

As a result of the Immunex acquisition in July 2002, the Company acquired the rights to ENBREL^® in the United States and Canada. ENBREL^® is approved in the United States for: the reduction of the signs and symptoms in patients with moderately to severely active rheumatoid arthritis (“RA”); treating moderately to severely active polyarticular-course juvenile RA in patients who have had an inadequate response to one or more disease modifying antirheumatic drugs; inhibiting the progression of structural damage in patients with moderately to severely active RA; and for reducing the signs and symptoms of active arthritis in patients with psoriatic arthritis. The Company believes that future sales of ENBREL^® will depend on: limits on the current supply of and sources of ENBREL^®, penetration of existing and new market opportunities, the availability and extent of reimbursement by third-party payors, the effects of competing products or therapies, and any potential adverse developments discovered with respect to ENBREL^®’s safety.

ENBREL^® is currently marketed in the United States and Canada under a co-promotion agreement with Wyeth and, accordingly, Wyeth receives a share of the profits from sales of ENBREL^®. In late December 2002, the FDA approved the Rhode Island manufacturing facility and the related third-party fill and finish facilities. Because of these plant approvals, additional supply of ENBREL^® is available to patients.

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Trends expected to impact future operations

Future operating results of the Company may be impacted by a number of factors. The following trends in our business are expected to impact our future liquidity and results of operations:

Forward looking statements and factors that may affect Amgen

This report and other documents we file with the Securities and Exchange Commission (“SEC”) contain forward looking statements that are based on current expectations, estimates, forecasts and projections about us, our future performance, our business or others on our behalf, our beliefs and our management’s assumptions. In addition, we, or others on our behalf, may make forward looking statements in press releases or written statements, or in our communications and discussions with investors and analysts in the normal course of business through meetings, webcasts, phone calls, and conference calls. Words such as “expect,” “anticipate,” “outlook,” “could,” “target,” “project,” “intend,” “plan,” “believe,” “seek,” “estimate,” “should,” “may,” “assume,” “continue,” variations of such words and similar expressions are intended to identify such forward looking statements. These statements are not guarantees of future performance and involve certain risks, uncertainties, and assumptions that are difficult to predict. We have based our forward looking statements on our management’s beliefs and assumptions based on information available to our management at the time the statements are made. We caution you that actual outcomes and results may differ materially from what is expressed, implied, or forecast by our forward looking statements. Reference is made in particular to forward looking statements regarding product sales, expenses, earnings per share, liquidity and capital resources, and trends. Except as required under the federal securities laws and the rules and regulations of the SEC, we do not have any intention or obligation to update publicly any forward looking statements after the distribution of this report, whether as a result of new information, future events, changes in assumptions, or otherwise.

The following items are representative of the risks, uncertainties, and assumptions that could affect the outcome of the forward looking statements.

Our sales depend on payment and reimbursement from third-party payors, and a reduction in the payment rate or reimbursement could result in decreased use or sales of our products.

In both domestic and foreign markets, sales of our products are dependent, in part, on the availability of reimbursement from third-party payors such as state and federal governments, under programs such as Medicare and Medicaid in the United States, and private insurance plans. Medicare does not cover prescriptions for ENBREL^®. In certain foreign markets, the pricing and profitability of our products generally are subject to government controls. In the United States, there have been, and we expect there will continue to be, a number of state and federal proposals that

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could limit the amount that state or federal governments will pay to reimburse the cost of drugs. In addition, we believe the increasing emphasis on managed care in the United States has and will continue to put pressure on the price and usage of our products, which may adversely impact product sales. Further, when a new therapeutic product is approved, the availability of governmental and/or private reimbursement for that product is uncertain, as is the amount for which that product will be reimbursed. We cannot predict the availability or amount of reimbursement for our recently approved products or product candidates, including those at a late stage of development, and current reimbursement policies for marketed products may change at any time; we believe that sales of Aranesp^® and Neulasta^™ are and will be affected by government and private payor reimbursement policies. Effective January 1, 2003, CMS instituted certain changes to its payment system that included a rule setting a significantly reduced reimbursement rate for Aranesp^® for Medicare patients in the hospital outpatient setting. While we believe that this new rule is based on inaccurate information, we cannot predict whether we will be successful in correcting inaccuracies underlying this rule, or if such reimbursement changes for Aranesp^® in this setting may impact reimbursement in other settings, by other payors, or for our other products.

If reimbursement for our marketed products changes adversely or if we fail to obtain adequate reimbursement for our other current or future products, health care providers may limit how much or under what circumstances they will administer them, which could reduce the use of our products or cause us to reduce the price of our products. This could result in lower product sales or revenues which could have a material adverse effect on us and our results of operations. For example, in the United States the use of EPOGEN^® in connection with treatment for end-stage renal disease is funded primarily by the U.S. federal government. In early 1997, CMS instituted a reimbursement change for EPOGEN^® which materially and adversely affected our EPOGEN^® sales until the policies were revised.

Our current products and products in development cannot be sold if we do not obtain and maintain regulatory approval.

We conduct research, preclinical testing, and clinical trials and we manufacture and contract manufacture our product candidates. We also manufacture and contract manufacture, price, sell, distribute, and market or co-market our products for their approved indications. These activities are subject to extensive regulation by numerous state and federal governmental authorities in the United States, such as the FDA and CMS, as well as in foreign countries, including Europe. Currently, we are required in the United States and in foreign countries to obtain approval from those countries’ regulatory authorities before we can market and sell our products in those countries. In our experience, obtaining regulatory approval is costly and takes many years, and after it is obtained, it remains costly to maintain. The FDA and other U.S. and foreign regulatory agencies have substantial discretion to terminate clinical trials, require additional testing, delay or withhold registration and marketing approval, require changes in labeling of our products, and mandate product withdrawals. Substantially all of our marketed products are currently approved in the United States and most are approved in Europe and in other foreign countries for specific uses. We currently manufacture and market all our approved products, and we plan to manufacture and market many of our potential products. Even though we have obtained regulatory approval for our marketed products, these products and our manufacturing processes are subject to continued review by the FDA and other regulatory authorities. In addition, ENBREL^® is manufactured both by us at our Rhode Island manufacturing facility and by a third-party contract manufacturer, Boehringer Ingelheim Pharma KG (“BI Pharma”), and fill and finish of bulk product produced at our Rhode Island manufacturing facility is done by third-party service providers. BI Pharma and these third-party service providers are subject to FDA

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regulatory authority. See “—Our sources of supply for ENBREL^® are limited.” In addition, later discovery of unknown problems with our products or manufacturing processes or those of our contract manufacturers or third-party service providers could result in restrictions on such products or manufacturing processes, including potential withdrawal of the products from the market. If regulatory authorities determine that we or our contract manufacturers or third-party service providers have violated regulations or if they restrict, suspend, or revoke our prior approvals, they could prohibit us from manufacturing or selling our marketed products until we or our contract manufacturers or third-party service providers comply or indefinitely. In addition, if regulatory authorities determine that we have not complied with regulations in the research and development of a product candidate, then they may not approve the product candidate and we will not be able to market and sell it. If we are unable to market and sell our products or product candidates, our business and results of operations would be materially and adversely affected.

If our intellectual property positions are challenged, invalidated or circumvented, or if we fail to prevail in present and future intellectual property litigation, our business could be adversely affected.

The patent positions of pharmaceutical and biotechnology companies can be highly uncertain and often involve complex legal, scientific, and factual questions. To date, there has emerged no consistent policy regarding breadth of claims allowed in such companies’ patents. Third parties may challenge, invalidate, or circumvent our patents and patent applications relating to our products, product candidates, and technologies. In addition, our patent positions might not protect us against competitors with similar products or technologies because competing products or technologies may not infringe our patents. For certain of our product candidates, there are third parties who have patents or pending patents that they may claim prevent us from commercializing these product candidates in certain territories. Patent disputes are frequent, costly, and can preclude commercialization of products. We are currently, and in the future may be, involved in patent litigation. For example, we are involved in ongoing patent infringement lawsuits against Transkaryotic Therapies, Inc. (“TKT”) and Aventis with respect to our erythropoietin patents. If we ultimately lose these or other litigations we could be subject to competition and/or significant liabilities, we could be required to enter into third-party licenses for the infringed product or technology, or we could be required to cease using the technology or product in dispute. In addition, we cannot guarantee that such licenses will be available on terms acceptable to us.

Our success depends in part on our ability to obtain and defend patent rights and other intellectual property rights that are important to the commercialization of our products and product candidates. We have filed applications for a number of patents and have been granted patents or obtained rights relating to erythropoietin, recombinant G-CSF, darbepoetin alfa, pegfilgrastim, etanercept, and our other products and potential products. We market our erythropoietin, recombinant G-CSF, darbepoetin alfa, pegfilgrastim, and etanercept products as EPOGEN^®, NEUPOGEN^®, Aranesp^®, Neulasta^™, and ENBREL^®, respectively. In the United States, we have been issued or obtained rights to several patents relating to erythropoietin that generally cover DNA and host cells, processes for making erythropoietin, various product claims to erythropoietin, cells that make levels of erythropoietin, and pharmaceutical compositions of erythropoietin. We have also been issued or obtained rights to U.S. patents relating to G-CSF that cover aspects of DNA, vectors, cells, processes, polypeptides, methods of treatment using G-CSF polypeptides, methods of enhancing bone marrow transplantation and treating burn wounds, methods for recombinant production of G-CSF, and analogs of G-CSF. We have been issued or obtained rights to U.S. and European patents relating to pegfilgrastim (pegylated G-CSF). We also have been granted or obtained rights to a patent in Europe relating to erythropoietin, a patent in Europe relating to G-CSF,

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two patents in Europe relating to darbepoetin alfa and hyperglycosylated erythropoietic proteins, and a patent in the United States and a patent in Europe relating to anakinra. We have been granted or have obtained rights to patents relating to etanercept in the United States that generally cover DNA (issued in 1995 and 2000); products (issued in 1999 and 2001); and processes for using (issued in 1997). These patents have varying expiration dates; with the latest U.S. etanercept related patent expiring in 2014. We have been granted or have obtained rights to patents relating to etanercept in Europe. The latest European patent relating to etanercept expires in 2011.

Limits on supply for ENBREL^® may constrain ENBREL^® sales.

U.S. and Canadian supply of ENBREL^® is impacted by many manufacturing and production variables, such as the timing and actual number of production runs, production success rate, bulk drug yield, and the timing and outcome of product quality testing. For example, in the second quarter of 2002, the prior co-marketer with respect to ENBREL^®, experienced a brief period where no ENBREL^® was available to fill patient prescriptions, primarily due to variation in the expected production yield from BI Pharma. Once supply of ENBREL^® became available, the prior co-marketer resumed filling orders on a first come, first served basis. If we are at any time unable to provide an uninterrupted supply of ENBREL^® to patients, we may lose patients, physicians may elect to prescribe competing therapeutics instead of ENBREL^®, our ENBREL^® sales will be adversely affected, any of which could materially and adversely affect our results of operations. See “—We are dependent on third parties for a significant portion of our supply and the fill and finish of ENBREL^®.” and “—Our sources of supply for ENBREL^® are limited.”

We are dependent on third parties for a significant portion of our supply and the fill and finish of ENBREL^®.

We currently manufacture ENBREL^® at our Rhode Island manufacturing facility. However, we also depend on third parties for a significant portion of our ENBREL^® supply as well as for the fill and finish of ENBREL^® that we manufacture. BI Pharma is currently our sole third-party supplier of ENBREL^®; accordingly, our U.S. and Canadian supply of ENBREL^® is currently significantly dependent on BI Pharma’s production schedule for ENBREL^®. We would be unable to produce ENBREL^® in sufficient quantities to substantially offset shortages in BI Pharma’s scheduled production if BI Pharma or other third-party manufacturers used for ENBREL^® production were to cease or interrupt production or services or otherwise fail to supply materials, products, or services to us for any reason, including due to labor shortages or disputes, due to regulatory requirements or action, or due to contamination of product lots or product recalls. This in turn could materially reduce our ability to satisfy demand for ENBREL^®, which could materially and adversely affect our operating results. Factors that will affect our actual supply of ENBREL^® at any time include, without limitation, the following:

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In addition, we are dependent on third parties for fill and finish of ENBREL^® bulk drug manufactured at our Rhode Island facility. If third-party fill and finish service providers are unable to provide sufficient capacity or otherwise unable to provide services to us, then supply of ENBREL^® could be adversely affected. See “—Limits on supply for ENBREL^® may constrain ENBREL^® sales.” and “—Our sources of supply for ENBREL^® are limited.”

Our sources of supply for ENBREL^® are limited.

ENBREL^® supply for the United States and Canada is produced by us at our Rhode Island facility and by BI Pharma, currently our sole source third-party supplier. See “—We are dependent on third parties for a significant portion of our supply and the fill and finish of ENBREL^®.” In addition, our current plan includes construction of an additional large-scale cell culture commercial manufacturing facility at the site of the current Rhode Island manufacturing facility. We have entered into a manufacturing agreement with Genentech, Inc. (“Genentech”) to produce ENBREL^® at Genentech’s manufacturing facility in South San Francisco, California. The manufacturing facility is subject to FDA approval, which the parties hope to obtain in 2004. Under the terms of the agreement, Genentech will produce ENBREL^® through 2005, with an extension through 2006 by mutual agreement. In addition, Wyeth is constructing a new manufacturing facility in Ireland, which is expected to increase the U.S. and Canadian supply of ENBREL^®. If additional manufacturing capacity at the Rhode Island site, or pursuant to the Genentech agreement, or if the Ireland manufacturing facility is not completed, or if these manufacturing facilities do not receive FDA approval before we encounter supply constraints, our ENBREL^® sales would be restricted which could have a material adverse effect on our results of operations.

We face substantial competition, and others may discover, develop, acquire or commercialize products before or more successfully than we do.

We operate in a highly competitive environment. Our products compete with other products or treatments for diseases for which our products may be indicated. For example, ENBREL^® competes in certain circumstances with rheumatoid arthritis products marketed by Abbott Laboratories/Knoll, Centocor Inc./Johnson & Johnson, Aventis, Pharmacia, and Merck as well as the generic drug methotrexate and may face competition from potential therapies being developed by Biogen, among others. Further, we believe that some of our newly approved products and late stage product candidates may face competition when and as they are approved and marketed. For example, in the United States, Aranesp^® competes with an Epoetin alfa product marketed by Johnson & Johnson in certain anemia markets and Kineret^® competes in certain circumstances with rheumatoid arthritis products marketed by Abbott Laboratories/Knoll, Centocor Inc./Johnson & Johnson and others. Additionally, some of our competitors, including biotechnology and pharmaceutical companies, market products or are actively engaged in research and development in areas where we are developing product candidates. Large pharmaceutical corporations may have greater clinical, research, regulatory, manufacturing, and marketing resources than we do. In addition, some of our competitors may have technical or competitive advantages over us for the development of technologies and processes. These resources may make it difficult for us to compete with them to successfully discover, develop, and market new products.

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Certain of our raw materials, medical devices and components are single-sourced from third parties; third-party supply failures could adversely affect our ability to supply our products.

Certain raw materials necessary for commercial manufacturing and formulation of our products are provided by single-source unaffiliated third-party suppliers. Also, certain medical devices and components necessary for fill, finish, and packaging of our products are provided by single-source unaffiliated third-party suppliers. Certain of these raw materials, medical devices, and components are the proprietary products of these unaffiliated third-party suppliers and, in some cases, such proprietary products are specifically cited in our drug application with the FDA so that they must be obtained from that specific sole source and could not be obtained from another supplier unless and until the FDA approved that other supplier. We would be unable to obtain these raw materials, medical devices, or components for an indeterminate period of time if these third-party single suppliers were to cease or interrupt production or otherwise fail to supply these materials or products to us for any reason, including due to regulatory requirements or action, due to adverse financial developments at or affecting the supplier, or due to labor shortages or disputes. This, in turn, could materially and adversely affect our ability to satisfy demand for our products, which could materially and adversely affect our operating results.

Also, certain of the raw materials required in the commercial manufacturing and the formulation of our products are derived from biological sources, including bovine serum and human serum albumin, or HSA. We are investigating screening procedures with respect to certain biological sources and alternatives to them. Raw materials may be subject to contamination and/or recall. A material shortage, contamination, and/or recall could adversely impact or disrupt our commercial manufacturing of our products or could result in a mandated withdrawal of our products from the market. This too, in turn, could adversely affect our ability to satisfy demand for our products, which could materially and adversely affect our operating results.

Our product development efforts may not result in commercial products.

We intend to continue an aggressive research and development program. Successful product development in the biotechnology industry is highly uncertain, and very few research and development projects produce a commercial product. Product candidates that appear promising in the early phases of development, such as in early human clinical trials, may fail to reach the market for a number of reasons, such as:

Several of our product candidates have failed at various stages in the product development process, including Brain Derived Neurotrophic Factor (“BDNF”) and Megakaryocyte Growth and Development Factor (“MGDF”). For example, in 1997, we announced the failure of BDNF for the treatment of amyotrophic lateral sclerosis, or Lou Gehrig’s Disease, because the product candidate,

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when administered by injection, did not produce acceptable clinical results for a specific use after a phase 3 trial, even though BDNF had progressed successfully through preclinical and earlier clinical trials. In addition, in 1998, we discontinued development of MGDF, a novel platelet growth factor, at the phase 3 trial stage after several people in platelet donation trials developed low platelet counts and neutralizing antibodies. Of course, there may be other factors that prevent us from marketing a product. We cannot guarantee we will be able to produce commercially successful products. Further, clinical trial results are frequently susceptible to varying interpretations by scientists, medical personnel, regulatory personnel, statisticians, and others which may delay, limit, or prevent further clinical development or regulatory approvals of a product candidate. Also, the length of time that it takes for us to complete clinical trials and obtain regulatory approval for product marketing has in the past varied by product and by the intended use of a product. We expect that this will likely be the case with future product candidates and we cannot predict the length of time to complete necessary clinical trials and obtain regulatory approval. See “—Our current products and products in development cannot be sold if we do not obtain and maintain regulatory approval.”

We may be required to perform additional clinical trials or change the labeling of our products if we or others identify side effects after our products are on the market.

If we or others identify side effects after any of our products are on the market, or if manufacturing problems occur, regulatory approval may be withdrawn and reformulation of our products, additional clinical trials, changes in labeling of our products, and changes to or re-approvals of our manufacturing facilities may be required, any of which could have a material adverse effect on sales of the affected products and on our business and results of operations.

For example, because ENBREL^® has only been marketed since 1998, its long-term effects on the development or course of serious infection, malignancy, and autoimmune disease are largely unknown and more rarely occurring side effects may not be known. In May 1999, Immunex announced an update to the package insert for ENBREL^® to advise doctors not to start using ENBREL^® in patients who have an active infection, and for doctors to exercise caution when considering using ENBREL^® in patients with a history of recurring infections or with underlying conditions that may predispose patients to infections. In October 2000, Immunex again revised the package insert for ENBREL^® in response to spontaneous adverse events reported to Immunex, including rare cases of hematologic and central nervous system disorders. The causal relationship between these adverse events and therapy with ENBREL^® remains unclear. In January 2001, Immunex revised the package insert for ENBREL^® to advise doctors that rare cases of central nervous system disorders, including seizures, and rare cases of tuberculosis have also been reported in patients using ENBREL^®. It is possible that additional spontaneous adverse events will be reported to us as experience with ENBREL^® continues. If we or others identify new adverse events for patients treated with ENBREL^®, additional precautions, warnings, or other changes in the label for ENBREL^® may be required.

We may be required to defend lawsuits or pay damages for product liability claims.

Product liability is a major risk in testing and marketing biotechnology and pharmaceutical products. We face substantial product liability exposure in human clinical trials and for products that we sell after regulatory approval. Product liability claims, regardless of their merits, could be costly and divert management’s attention, and adversely affect our reputation and the demand for our products.

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Our operating results may fluctuate, and this fluctuation could cause financial results to be below expectations.

Our operating results may fluctuate from period to period for a number of reasons. In budgeting our operating expenses, we assume that revenues will continue to grow; however, some of our operating expenses are fixed in the short term. Because of this, even a relatively small revenue shortfall may cause a period’s results to be below our expectations or projections. A revenue shortfall could arise from any number of factors, some of which we cannot control. For example, we may face:

Of these, we would only have control over changes in our product pricing strategies and, of course, there may be other factors that affect our revenues in any given period.

We plan to grow rapidly, and if we fail to adequately manage that growth our business could be adversely impacted.

We have an aggressive growth plan that includes substantial and increasing investments in research and development, sales and marketing, and facilities. Our plan has a number of risks, some of which we cannot control. For example:

Of course, there may be other risks and we cannot guarantee that we will be able to successfully manage these or other risks.

Our stock price is volatile, which could adversely affect your investment.

Our stock price, like that of other biotechnology companies, is highly volatile. For example, in the fifty-two weeks prior to March 31, 2003, the trading price of our common stock has ranged from a high of $61.48 per share to a low of $30.57 per share. Our stock price may be affected by such factors as:

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In addition, if our revenues or earnings in any period fail to meet the investment community’s expectations, there could be an immediate adverse impact on our stock price.

Our corporate compliance program cannot guarantee that we are in compliance with all potentially applicable federal and state regulations.

The development, manufacturing, pricing, sales, and reimbursement of our products, together with our general operations, is subject to extensive federal and state regulation. See “—Our current products and products in development cannot be sold if we do not obtain and maintain regulatory approval.” and “—We may be required to perform additional clinical trials or change the labeling of our products if we or others identify side effects after our products are on the market.” While we have developed and instituted a corporate compliance program based on current best practices, we cannot assure you that we or our employees are or will be in compliance with all potentially applicable federal and state regulations. If we fail to comply with any of these regulations a range of actions could result, including, but not limited to, the termination of clinical trials, the failure to approve a product candidate, restrictions on our products or manufacturing processes, including withdrawal of our products from the market, significant fines, or other sanctions or litigation.

Our marketing of ENBREL^® will be dependent in part upon Wyeth.

Under the amended and restated co-promotion agreement, we and Wyeth market and sell ENBREL^® in the United States and Canada. An ENBREL^® management committee comprised of an equal number of representatives from us and Wyeth is responsible for overseeing the marketing and sales of ENBREL^®, including strategic planning, approval of an annual marketing plan, product pricing, and establishing an ENBREL^® brand team. The ENBREL^® brand team, with equal representation from us and Wyeth, will prepare and implement the annual marketing plan and will be responsible for all sales activities. If Wyeth fails to market ENBREL^® effectively or if we and Wyeth fail to coordinate our efforts effectively, our sales of ENBREL^® may be adversely affected.

Guidelines and recommendations published by various organizations can reduce the use of our products.

Government agencies promulgate regulations and guidelines directly applicable to us and to our products. However, professional societies, practice management groups, private health/science foundations, and organizations involved in various diseases from time to time may also publish guidelines or recommendations to the health care and patient communities. Recommendations of government agencies or these other groups/organizations may relate to such matters as usage, dosage, route of administration, and use of concomitant therapies. Organizations like these have in the past made recommendations about our products. Recommendations or guidelines that are followed by patients and health care providers could result in decreased use of our products. In addition, the perception by the investment community or stockholders that recommendations or guidelines will result in decreased use of our products could adversely affect prevailing market prices for our common stock.

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We may not realize all of the anticipated benefits of our merger with Immunex.

On July 15, 2002, we merged with Immunex Corporation. The success of our merger with Immunex will depend, in part, on our ability to realize the anticipated synergies, cost savings, and growth opportunities from integrating the businesses of Immunex with the businesses of Amgen. Our success in realizing these benefits and the timing of this realization depend upon the successful integration of the operations of Immunex. The integration of two independent companies is a complex, costly, and time-consuming process. The difficulties of combining the operations of the companies include, among others: