( y notwarrant further development of th...)Second Phase III Study Evaluating Gilead's Viread for the Treatment,of Chronic Hepatitis B Virus Meets Primary Endpoint,Health

y not warrant further development of this compound for the treatment of chronic hepatitis B and completing our clinical studies may take longer or cost more than expected. In addition, feedback from regulatory authorities or results from clinical trials might require modifications or delays in later stage clinical trials or additional trials to be performed. Further, the FDA and other regulatory authorities may not approve tenofovir DF for the treatment of chronic hepatitis B, and marketing approval, if granted, may have significant limitations on its use and physicians and may not see advantages of tenofovir DF over other treatment options and may therefore be reluctant to prescribe tenofovir DF for chronic hepatitis B. These risks, uncertainties and other factors could cause actual results to differ materially from those referred to in the forward-looking statements. The reader is cautioned not to rely on these forward-looking statements. These and other risks are described in detail in Gilead's Annual Report on Form 10-K for the year ended December 31, 2006 and its Quarterly Report on Form 10-Q for the first quarter of 2007, filed with the U.S. Securities and Exchange Commission. All forward-looking statements are based on information currently available to Gilead, and Gilead assumes no obligation to update any such forward-looking statements.

Hepsera and Viread are registered trademarks of Gilead Sciences, Inc.

For more information on Gilead, please call the Gilead Public Affairs Department at 1-800-GILEAD-5 (1-800-445-3235) or visit www.gilead.com.

CONTACT: Gilead Sciences, Inc.
Susan Hubbard, 650-522-5715 (Investors)
James Loduca, 650-522-5908 (Media)
www.gilead.com

SOURCE: Gilead Sciences, Inc.

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