Press Releases

December 22, 2010

Gilead Terminates Phase III Clinical Trial of Ambrisentan in Patients with Idiopathic Pulmonary Fibrosis

FOSTER CITY, Calif., Dec 22, 2010 (BUSINESS WIRE) -- Gilead Sciences, Inc. (Nasdaq: GILD) today announced it is stopping ARTEMIS-IPF, the company's ongoing Phase III clinical trial of ambrisentan in patients with idiopathic pulmonary fibrosis (IPF), due to lack of efficacy. This decision follows an interim analysis of unblinded efficacy and safety data by the study's Data Monitoring Committee (DMC) and review of those data by Gilead, which did not show evidence of a treatment benefit in the group of patients randomized to receive ambrisentan. Gilead is conducting a thorough review of the data and will communicate the full results of this analysis to the medical community when they are available.

About Gilead Sciences

Gilead Sciences is a biopharmaceutical company that discovers, develops and commercializes innovative therapeutics in areas of unmet medical need. The company's mission is to advance the care of patients suffering from life-threatening diseases worldwide. Headquartered in Foster City, California, Gilead has operations in North America, Europe and Australia.

Forward-Looking Statement

This press release includes forward-looking statements, within the meaning of the Private Securities Litigation Reform Act of 1995, that are subject to risks, uncertainties and other factors that could cause actual results to differ materially from those referred to in the forward-looking statements, including risks that development stage compounds may fail during clinical testing. The reader is cautioned not to rely on these forward-looking statements. These and other risks are described in detail in Gilead's Quarterly Report on Form 10-Q for the quarter ended September 30, 2010, as 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.

For more information on Gilead Sciences, please visit the company's website at www.gilead.com or call Gilead Public Affairs at 1-800-GILEAD-5 or 1-650-574-3000.

SOURCE: Gilead Sciences, Inc.

Gilead Sciences, Inc.
Susan Hubbard, Investors, 650-522-5715
Nathan Kaiser, Media, 650-522-1853