( FOSTER CITY Calif.--(BUSINESS WIRE)--M...)Data from Preclinical Studies of Gilead Nucleotide Compound GS 9219,to be Presented at AACR,Health

FOSTER CITY, Calif.--(BUSINESS WIRE)--Mar 15, 2007 - Gilead Sciences, Inc. (Nasdaq:GILD) today announced that the company will present data on a novel nucleotide analog, GS 9219, which has shown evidence of anti-cancer activity in preclinical studies, at the 2007 Annual Meeting of the American Association for Cancer Research (AACR), which will take place in Los Angeles on April 14-18, 2007.

"While Gilead's R&D program is not currently focused on oncology, GS 9219 emerged from our efforts in antiviral nucleotide chemistry and cellular targeting and was advanced based on its promising preclinical profile," commented Norbert Bischofberger, PhD, Gilead's Executive Vice President, Research and Development and Chief Scientific Officer. "The early data that will be shared at AACR have formed the basis for our decision to initiate Phase I clinical studies later this year."

GS 9219 was cleared for Phase I human trials by the U.S. Food and Drug Administration following Gilead's submission of an investigational New Drug Application for the compound in late 2006. Gilead expects to initiate a Phase I study of patients with non-Hodgkin's lymphoma and chronic lymphocytic leukemia later this year at cancer centers in the United States.

About GS 9219

GS 9219 is a prodrug of the nucleotide analog PMEG (9-(2-phosphonylmethoxyethyl)guanine). It is selectively enriched in lymphocytes, and therefore may have potential applications in combating hematological malignancies. As an investigational compound, GS 9219 has not been determined safe or efficacious in humans.

About Gilead

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
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