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FREEDOM-C(2) Trial of Oral Treprostinil in Pulmonary Arterial Hypertension Does Not Meet Primary Endpoint
Date:8/24/2011

SILVER SPRING, Md., Aug. 24, 2011 /PRNewswire/ -- United Therapeutics Corporation (NASDAQ: UTHR) announced today the completion of its FREEDOM-C(2) Phase 3 trial of treprostinil diethanolamine (oral treprostinil), an investigational sustained release oral formulation of treprostinil, a stable synthetic form of prostacyclin, in patients with pulmonary arterial hypertension (PAH).  Preliminary analysis demonstrates that the trial did not achieve statistical significance for the primary endpoint, six-minute walk distance (6MWD) at Week 16.

The FREEDOM-C(2) trial was a randomized, double-blind, placebo-controlled trial of patients with PAH, a chronic, life-threatening illness.  The study population consisted of 310 patients who were optimized on an endothelin receptor antagonist, a phosphodiesterase-5 inhibitor, or both.  In addition to one of these oral therapy regimens, patients were administered oral treprostinil or placebo twice daily with the dose titrated (increased to tolerability) over the 16-week trial.  The majority (~73%) of patients were World Health Organization (WHO) Class III patients of varied etiologies, including idiopathic or familial PAH (~65%), collagen vascular disease associated PAH (~31%), and PAH associated with HIV or other associated conditions (~3%).  Mean baseline walk distance was approximately 333 meters.

The primary efficacy endpoint of the trial was the median change in 6MWD at 16 weeks relative to baseline.  With regard to the primary efficacy results, the placebo-corrected median change in 6MWD at Week 16 was 10 meters (p=0.089, Hodges-Lehmann estimate and non-parametric analysis of covariance in accordance with the trial's pre-specified statistical analysis plan).

Overall, 132 (84%) oral treprostinil and 138 (90%) placebo patients completed Week 16 with an average dose of 3.0 plus or minus 1.9 mg twi
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SOURCE United Therapeutics Corporation
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