RESEARCH SUPPORT, NON-U.S. GOV'T
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Long-term treatment with sildenafil citrate in pulmonary arterial hypertension: the SUPER-2 study.

Chest 2011 November
BACKGROUND: The long-term safety and tolerability of sildenafil treatment of pulmonary arterial hypertension (PAH) were assessed.

METHODS: Two hundred fifty-nine of 277 randomized and treated patients completed a 12-week, double-blind, placebo-controlled trial (SUPER-1 [Sildenafil Use in Pulmonary Arterial Hypertension]) of oral sildenafil in treatment-naive patients with PAH (96% functional class II/III) and entered an open-label uncontrolled extension study (SUPER-2) that continued until the last patient completed 3 years of sildenafil treatment. Patients titrated to sildenafil 80 mg tid; one dose reduction for tolerability was allowed during the titration phase.

RESULTS: The median duration of sildenafil treatment across SUPER-1 and SUPER-2 was 1,242 days (range, 1-1,523 days); 170 patients (61%) completed both studies, and 89 patients discontinued from SUPER-2. After 3 years, 87% of 183 patients on treatment were receiving sildenafil 80 mg tid. Of patients remaining under follow-up, 3%, 10%, and 18% were receiving a second approved PAH therapy at 1, 2, and 3 years, respectively. At 3 years post-SUPER-1 baseline, 127 patients had an increased 6-min walk distance (6MWD); 81 improved and 86 maintained functional class. Most adverse events were of mild or moderate severity. At 3 years, 53 patients had died (censored, n = 37). Three-year estimated survival rate was 79%; if all censored patients were assumed to have died, 3-year survival rate was 68%. No deaths were considered to be treatment related.

CONCLUSIONS: Long-term treatment of PAH initiated as sildenafil monotherapy was generally well tolerated. After 3 years, the majority of patients (60%) who entered the SUPER-1 trial improved or maintained their functional status, and 46% maintained or improved 6MWD.

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