Results of TRIUMPH-1 Trial of Viveta in Pulmonary Arterial Hypertension to Be Announced Before Market Open on Thursday, Novemb...( SILVER SPRING Md. Oct. 31 /- Unit...),Health

SILVER SPRING, Md., Oct. 31 /PRNewswire-FirstCall/ -- United Therapeutics Corporation (Nasdaq: UTHR) and its wholly-owned subsidiary, Lung Rx, Inc., announced today that they will release the results of their TRIUMPH-1 Phase 3 trial of Viveta, an inhaled formulation of treprostinil, in pulmonary arterial hypertension (PAH) before market open on Thursday, November 1, 2007.

United Therapeutics will expand its previously scheduled conference call on November 1, 2007, to a full hour to accommodate a discussion of the TRIUMPH-1 results. The call will begin at 9:00 a.m. Eastern Time. Lewis J. Rubin, MD, FCCP, Co-Chair of the TRIUMPH-1 Steering Committee and Professor of Medicine at University of California San Diego Medical Center, will join United Therapeutics' management on the call to answer questions related to TRIUMPH-1.

About TRIUMPH-1

TRIUMPH-1 (TReprostinil Sodium Inhalation Used in the Management of Pulmonary Arterial Hypertension), was a randomized, double-blind, placebo- controlled trial of patients with severe PAH, a chronic, life-threatening illness. The study population consisted of 235 patients who were optimized on an approved oral therapy for PAH, either bosentan (Tracleer), an endothelin receptor antagonist, or sildenafil (Revatio), a phosphodiesterase-5 inhibitor. The primary efficacy endpoint of the trial was the change in six-minute walk distance at 12 weeks measured at peak exposure, defined by the trial protocol as 10-60 minutes after inhalation of Viveta, relative to baseline.

Conference Call

United Therapeutics will host a one-hour teleconference on Thursday, November 1, 2007, at 9:00 a.m. Eastern Time. The teleconference is accessible by dialing 1-800-603-1777, with in
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