FREEDOM-C: Oral Treprostinil in Combination With an Endothelin Receptor Antagonist (ERA) and/or a Phosphodiesterase-5 (PDE-5) Inhibitor for the Treatment of Pulmonary Arterial Hypertension (PAH)

United Therapeutics

Status and phase

Completed

Phase 3

Conditions

Pulmonary Hypertension

Treatments

Drug: Placebo

Drug: Oral treprostinil (UT-15C) sustained release tablets

Study type

Interventional

Funder types

Industry

Identifiers

NCT00325442

TDE-PH-301

Details and patient eligibility

About

This study was an international, multi-center, randomized, double-blind, placebo-controlled study in subjects with PAH who were currently receiving approved therapy for their PAH (i.e., endothelin receptor antagonist and/or phosphodiesterase-5 inhibitor). Study visits occurred at 4 week intervals for 16 weeks; the key measure of efficacy was the 6-minute walk test. Study procedures included routine blood tests, medical history, physical exams, disease evaluation, and exercise tests. One optional substudy was also a part of FREEDOM-C at select centers - a hemodynamic substudy with a right heart catheterization at Baseline and Week 16.

Patients who completed all assessments for 16-weeks were also eligible to enter an open-label, extension phase study (FREEDOM - EXT).

Enrollment

354 patients

Sex

All

Ages

12 to 70 years old

Volunteers

No Healthy Volunteers

Inclusion criteria

Between 12 and 70 years of age, inclusive.
Body weight at least 45 kg (approximately 100 pounds).
PAH that is either idiopathic/heritable (including PAH associated with appetite suppressant/toxin use); PAH associated with repaired congenital systemic-to-pulmonary shunts (repaired ≥ 5 years); PAH associated with collagen vascular disease; or PAH associated with HIV.
Baseline 6-minute walk distance between 150 and 450 meters, inclusive.
Currently receiving an approved endothelin receptor antagonist and/or an approved phosphodiesterase-5 inhibitor for at least 90 days and on a stable dose for at least the last 30 days.
Previous testing (e.g., right heart catheterization, echocardiography) consistent with the diagnosis of PAH.
Reliable and cooperative with protocol requirements.

Exclusion criteria

Nursing or pregnant.
Received a prostacyclin within the past 30 days.
PAH due to conditions other than noted in the above inclusion criteria.
History of uncontrolled sleep apnea, renal insufficiency, anemia, left sided heart disease, uncontrolled systemic hypertension, or parenchymal lung disease.
Use of an investigational drug within 30 days of Baseline.