( SAN FRANCISCO--(BUSINESS WIRE)--May 21...)Gilead Announces Presentation of Long-Term Data for Ambrisentan, a,Potential Treatment for Patients With Pulmonary Arterial,Hypertension,Health

SAN FRANCISCO--(BUSINESS WIRE)--May 21, 2007 - Gilead Sciences, Inc. (Nasdaq:GILD) today announced results of two long-term studies evaluating ambrisentan, an investigational endothelin receptor antagonist (ERA) for the treatment of patients with pulmonary arterial hypertension (PAH). These long-term data are from patients who originally participated in the two pivotal Phase III ARIES studies and AMB-222, a Phase II study of patients who had previously discontinued other ERAs because of liver function abnormalities. These studies were selected for oral presentation at ATS 2007, the International Conference of the American Thoracic Society, taking place in San Francisco, California, May 18-23.

"Pulmonary arterial hypertension is a progressive, life-threatening disease for which new therapies are clearly needed," said Ronald J. Oudiz, MD, Associate Professor of Medicine, UCLA School of Medicine and Director, Liu Center for Pulmonary Hypertension, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center. "The long-term clinical profile observed in these ambrisentan studies is very encouraging."

About the Studies

In the first presentation (Abstract #2307), Dr. Oudiz presented results from an integrated analysis of an ongoing, long-term extension study (ARIES-E) involving patients from the two 12-week Phase III placebo-controlled studies (ARIES-1 and ARIES-2). A total of 383 patients with idiopathic PAH or PAH associated with connective tissue disease, HIV infection, or anorexigen use who received at least one dose of ambrisentan (2.5, 5 or 10 mg once-daily) in ARIES-1, ARIES-2 or ARIES-E were included in the integrated analysis, which reflect data available as of February 2006 (mean exposure = 39 weeks; maximum exposure = 109 weeks).

Improvements in the non placebo-corrected 6-minute walk distance observed during the first 12 weeks of ambrisentan treatment (+37.7 meters) were sus
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