Altimmune Inc. announced positive topline results from the IMPACT Phase 2b trial of pemvidutide, a balanced 1:1 glucagon/GLP-1 dual receptor agonist, in patients with metabolic dysfunction-associated steatohepatitis (MASH) at 48 weeks. The trial demonstrated improvements in key non-invasive markers of fibrosis across treatment arms compared to placebo, with continued reductions from the 24-week timepoint. Additional weight loss was observed from 24 to 48 weeks with the 1.8 mg dose, without plateauing. Pemvidutide maintained a favorable tolerability profile at 48 weeks, with a low treatment-related discontinuation rate. Following an end-of-Phase 2 meeting with the FDA, Altimmune plans to advance pemvidutide to a registrational Phase 3 trial in MASH patients with moderate to advanced liver fibrosis, expected to begin in 2026. The 48-week Phase 2b data were presented during a conference call and webcast on December 19, 2025.