Portola Pharmaceuticals Announces Positive Data from a Phase II,Study of its Factor Xa Inhibitor at the XXI Congress of the,International Society on Thrombosis and Haemostasis ( ere adjudicated by ablinded independe...)

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Portola Pharmaceuticals Announces Positive Data from a Phase II,Study of its Factor Xa Inhibitor at the XXI Congress of the,International Society on Thrombosis and Haemostasis

ere adjudicated by a blinded, independent central adjudication committee. The study was not powered to show a dose response with PRT054021 or efficacy of PRT054021 versus enoxaparin.

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 twenty hour pharmacodynamic 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. PRT054021 is expected to enter Phase III clinical development in the first half of 2008.

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 fibrillation and for secondary prevention of myocardial infarction (MI) and stroke. Portola's second compound, PRT060128, is an o
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( ere adjudicated by ablinded independe...)Portola Pharmaceuticals Announces Positive Data from a Phase II,Study of its Factor Xa Inhibitor at the XXI Congress of the,International Society on Thrombosis and Haemostasis,Health