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Portola Pharmaceuticals Announces Positive Phase II Results for,PRT054021 for Prevention of Venous Thromboembolism Following Total,Knee Replacement Surgery

tzerland (July 6-12, 2007).

"There is a tremendous need for a once a day, oral anticoagulant to replace and improve upon current therapies," said A.G.G. Turpie, M.D., EXPERT's principal investigator and Professor of Medicine at McMaster University in Hamilton, Ontario. "We are encouraged by the EXPERT results and we look forward to studying the unique properties of PRT054021 in additional clinical trials."

About PRT054021 - Portola's Factor Xa Inhibitor

PRT054021 is an oral Factor Xa inhibitor, an anticoagulant initially being studied for the prevention of venous thromboembolism in patients who have undergone orthopedic surgery. Portola expects to develop PRT054021 for additional indications including stroke prevention in patients with atrial fibrillation and secondary prevention of myocardial infarction and stroke. Factor Xa is a validated target (one for which there are approved drugs on the market), and inhibiting its activity is believed to have superior anticoagulant properties compared to other targets such as thrombin. Portola believes its oral Factor Xa inhibitor will offer several advantages, including a long half-life to support once daily dosing and a low peak-to-trough concentration ratio, resulting in consistent activity that does not require monitoring or dose adjustment. In addition, PRT054021 is not excreted in the kidneys and therefore will not require dose adjustment in patients with impaired renal function.

About Portola Pharmaceuticals, Inc.

Portola Pharmaceuticals, Inc. is a privately-held biopharmaceutical company dedicated to the discovery, development and commercialization of novel therapeutics for acute and chronic cardiovascular and vascular disease. Portola is currently developing two clinical stage antithrombotics. Portola's lead compound, PRT054021, is an oral Factor Xa inhibitor for the prevention of venous thromboembolism after orthopedic surgery, for stroke prevention in patients with atrial fibrilla
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