PAH Clinical Trials 2026: Emerging Therapies and What's in the Pipeline
The PAH pipeline in 2026 is advancing on multiple fronts, building on the transformative sotatercept approval to explore disease modification and potentially curative approaches. Key ongoing and recently reported trials: The ZENITH trial is studying sotatercept in WHO FC II patients — earlier in the disease course where modification of vascular remodeling may have maximum impact. The ADVANCE OUTCOMES trial is evaluating sotatercept's effect on morbidity and mortality as a primary endpoint (vs. STELLAR's 6MWT endpoint). Combination of sotatercept with initial triple oral therapy is being explored in investigator-initiated trials. Gene therapy approaches targeting BMPR2 mutations (the most common genetic cause of heritable PAH) are in early clinical development. Ralinepag, a second-generation oral prostacyclin receptor agonist, showed Phase 2 efficacy data. Several trials are examining the role of GDF/activin pathway inhibition beyond sotatercept. Anti-inflammatory and metabolic approaches (metformin in PAH via METPAH; dichloroacetate targeting metabolic reprogramming of pulmonary vascular cells) are in Phase 1/2. The Pulmonary Hypertension Association (PHAssociation.org) maintains a searchable clinical trial database and offers patient matching support for any PAH patient interested in participating.
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