RAHWAY, N.J.--(BUSINESS WIRE)--Merck (NYSE: MRK), known as MSD outside the United States and Canada, today announced positive results from the Phase 3 HYPERION trial evaluating WINREVAIRâ"¢ (sotatercept-csrk) versus placebo (both in combination with background therapy) in recently diagnosed adults with pulmonary arterial hypertension (PAH, WHO* Group 1) functional class (FC) II or III at intermediate or high risk of disease progression. In the study, WINREVAIR reduced the risk of clinical worseni. ...