Altimmune Announces Positive Topline Results from the IMPACT Phase 2b Trial of Pemvidutide in the Treatment of MASH

Core Insights - Altimmune, Inc. announced positive topline results from the IMPACT Phase 2b trial of pemvidutide for metabolic dysfunction-associated steatohepatitis (MASH), demonstrating significant MASH resolution and weight loss at 24 weeks [2][4][5] Study Results - The Phase 2b trial enrolled 212 participants with biopsy-confirmed MASH and fibrosis stages F2/F3, randomized to receive either weekly subcutaneous pemvidutide at 1.2 mg or 1.8 mg doses or placebo for 24 weeks [3][10] - In an intent-to-treat (ITT) analysis, MASH resolution without worsening of fibrosis was achieved in 59.1% and 52.1% of participants treated with pemvidutide 1.2 mg and 1.8 mg, respectively, compared to 19.1% for placebo (p< 0.0001) [3][7] - Fibrosis improvement without worsening of MASH was observed in 31.8% and 34.5% of participants treated with pemvidutide 1.2 mg and 1.8 mg, respectively, versus 25.9% for placebo [3][7] - Weight loss at 24 weeks was 5.0% for the 1.2 mg group and 6.2% for the 1.8 mg group, compared to 1.0% in the placebo group (p< 0.001) [3][7] - Liver fat reductions of 58.0% and 62.8% were achieved in participants receiving pemvidutide 1.2 mg and 1.8 mg, respectively, versus 16.2% in the placebo group (p< 0.001) [7][8] Safety and Tolerability - Pemvidutide demonstrated potentially best-in-class tolerability, with less than 1% treatment discontinuations due to adverse events [2][4] - Adverse events leading to treatment discontinuation were 0.0% and 1.2% for pemvidutide 1.2 mg and 1.8 mg, respectively, compared to 2.4% in the placebo group [3][7] Future Outlook - The company anticipates a successful End of Phase 2 meeting with the FDA in the fourth quarter of 2025, enabling rapid progression to Phase 3 [5][4] - The ongoing IMPACT trial is expected to provide a final readout in the fourth quarter of 2025 [10]