Merck’s Winrevair Sees Phase 2 Pulmonary Hypertension Win
Merck says its drug Winrevair (sotatercept-csrk) significantly improved a key measure of heart–lung function in a mid-stage trial of patients with a rare and hard-to-treat form of pulmonary hypertension linked to heart failure with preserved ejection fraction (HFpEF). Topline data from the Phase 2 CADENCE study showed the drug reduced pulmonary vascular resistance (PVR) at 24 weeks compared with placebo, meeting the trial’s primary endpoint, according to the company. PVR reflects how easily blood flows through the lungs to the heart; elevated levels are associated with worse outcomes in pulmonary hypertension.
The study evaluated sotatercept in adults with combined post- and precapillary pulmonary hypertension (CpcPH) due to HFpEF — a subset of Group 2 pulmonary hypertension caused by left-sided heart disease. CpcPH is associated with worse outcomes and currently has no approved therapies.
CADENCE enrolled 164 patients with NYHA Class II or III symptoms and randomized them to placebo or one of two doses of Winrevair (0.3 mg/kg or 0.7 mg/kg). In addition to PVR, investigators assessed exercise capacity, echocardiographic measures, biomarkers and clinical outcomes. Merck says the safety findings were generally consistent with the drug’s known profile.
Winrevair is currently approved in the U.S. for treating pulmonary arterial hypertension (PAH), where it improves exercise capacity, functional class and reduces the risk of disease progression, hospitalization, and death, Merck says. The drug, developed under a licensing partnership with Bristol Myers Squibb, is the first activin-signaling inhibitor approved for PAH.