Open-label Extension of Oral Treprostinil in Subjects With PH Associated With HFpEF

Overview

This was an open-label study to evaluate the safety of continued therapy with oral treprostinil in subjects who completed Study TDE-HF-301. This study provided long-term, open-label data regarding the effect of continued long-term oral treprostinil therapy for the treatment of pulmonary hypertension (PH) associated with heart failure with preserved ejection fraction (HFpEF). Subject visits occurred at Baseline, Weeks 6, 12, 18, 24, and every 12 weeks thereafter until either oral treprostinil was commercially available to treat PH associated with HFpEF or the study was discontinued by the Sponsor. The Sponsor terminated Studies TDE-HF-301 and TDE-HF-302 on 14 October 2019 due to slow enrollment. Safety data from the final subject in Study TDE-HF-302 were recorded on 02 March 2020. Due to the lower than expected number of subjects enrolled, the planned secondary efficacy-related endpoints were not analyzed.

Study TDE-HF-302 was a multicenter, open-label study in subjects participating and completing all required visits for Study TDE-HF-301. This study assessed the long-term safety of oral treprostinil in subjects with PH associated with HFpEF. Subjects received oral treprostinil as 0.125-, 0.25-, 1-, and 2.5-mg sustained-release tablets. For subjects who were randomly allocated to receive oral treprostinil in Study TDE-HF-301, the initial dose of oral treprostinil was the same as the final dose in Study TDE-HF-301. Subjects randomly allocated to receive placebo in Study TDE-HF-301 were administered the initial dose of oral treprostinil at 0.125 mg 3 times daily (TID). Dose increases could occur in 0.125-mg increments every 72 hours at the discretion of the Investigator up to 6 mg TID, the maximum allowable dose determined by the Data Monitoring Committee during Study TDE-HF-301. Doses of study drug were to be increased in the absence of dose-limiting drug-related adverse events (AEs) to ensure that each subject received the optimal dose throughout the study. Subjects returned for visits at Weeks 6, 12, 18, and 24, and every 12 weeks thereafter. Subjects who terminated the study early were asked to return to the study center for a final evaluation. Safety assessments consisted of AEs, clinical laboratory parameters, and clinical assessment of heart failure signs and symptoms. Due to the lower than expected number of subjects enrolled, the planned secondary efficacy-related endpoints were not analyzed.