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Patient Enrollment Three Quarters Complete for Phase 3 Trial of Thelin

HOUSTON, July 6, 2004 (PRIMEZONE) -- Encysive Pharmaceuticals (NasdaqNM:ENCY - News) today confirmed that enrollment in the STRIDE-2 clinical trial is expected to complete in the third quarter of 2004. Enrollment is close to three quarters complete in this 240 patient study. The Company expects to provide its next update when STRIDE-2 has been fully enrolled.

STRIDE-2 is a Phase III, randomized, double-blind, placebo-controlled safety and efficacy study of Thelin(tm) treatment with an open-label bosentan arm in patients with pulmonary arterial hypertension (PAH). Patients are randomized to receive one of four treatments: Thelin 50 mg once daily, Thelin 100 mg once daily, placebo once daily, or bosentan twice daily according to the package insert. The duration of the trial is 18 weeks.

About Thelin(tm) and PAH
Thelin is a small molecule that blocks the action of endothelin, a potent mediator of blood vessel constriction and growth of smooth muscle in vascular walls. Endothelin receptor antagonists may prove to be effective in the treatment of a variety of diseases where the regulation of vascular constriction is important. Thelin is 6,500 fold selective in the targeting of the endothelin A receptor.

Pulmonary arterial hypertension (PAH) is a condition that involves high blood pressure and structural changes in the walls of the pulmonary arteries, which are the blood vessels that connect the right side of the heart to the lungs. PAH causes shortness of breath, limits activity, and is eventually fatal unless treated successfully with heart and lung transplant. Primary and secondary PAH are estimated to afflict approximately 80,000 to 100,000 people worldwide, many of whom are children and young women.

Side effects of Thelin(tm) seen in the program to date, and which occurred more frequently than in placebo, include liver dysfunction (increased ALT and AST), headache, edema, constipation, nasal congestion and flushing. Because Thelin inhibits the metabolism of warfarin, the dose of warfarin should be adjusted downward when co-administered with Thelin.

Source: Encysive Pharmaceuticals

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