Altimmune Presents AI-Based Analysis of Liver Fibrosis Reduction from IMPACT Phase 2b Trial of Pemvidutide in MASH in Late-breaking Poster at AASLD The Liver Meeting® 2025

AI-based digital pathology analysis provides high-resolution quantification of hepatic fibrosis and objective measurement of fibrosis improvement

Pemvidutide demonstrated significant reductions in liver fibrosis and improvements in non-invasive tests vs. placebo at 24 weeks

GAITHERSBURG, Md., Nov. 07, 2025 (GLOBE NEWSWIRE) -- Altimmune, Inc. (Nasdaq: ALT), a late clinical-stage biopharmaceutical company developing novel peptide-based therapeutics for liver and cardiometabolic diseases, today announced results from an artificial intelligence (AI)-based analysis of biopsies from the IMPACT Phase 2b trial of pemvidutide in patients with metabolic dysfunction-associated steatohepatitis (MASH).

The AI-based pathology tool Liver Explore™ showed that pemvidutide treatment resulted in significant reductions in the proportionate areas of early, advanced and total liver fibrosis compared to placebo at 24 weeks. These data are supported by significant improvements in non-invasive markers of fibrosis compared to placebo. The AI-based analysis will be presented on Saturday, November 8, in a late-breaking poster session at The Liver Meeting 2025, hosted by the American Association for the Study of Liver Diseases (AASLD) in Washington, D.C.

“Changes in fibrosis can be difficult to quantify by traditional histological methods, which are semi-quantitative and prone to observer variability. AI-based methods can provide an automated, sensitive and truly quantitative analysis of changes in fibrosis in patients with MASH,” said Vlad Ratziu, MD, PhD, Professor of Hepatology at Sorbonne University and Pitié-Salpêtrière Hospital in Paris, France. “It is exciting to see this technology being used to accelerate the development of potential new therapies for MASH.”

Highlights from the AI-based analysis of biopsies from patients in the IMPACT Phase 2b trial include:

Data for total fibrosis showed 31% of patients in the pemvidutide 1.8 mg group (n = 85), and 12% of patients in the pemvidutide 1.2 mg group (n = 41) achieved a ≥ 60% reduction in the area of fibrosis compared to 8% of placebo-treated patients (n = 86, p = 0.0003 and p = 0.5, respectively). Data for early fibrosis showed 34% of patients in the pemvidutide 1.8 mg group (n = 85), and 24% of patients in the pemvidutide 1.2 mg group (n = 41) achieved ≥ 60% reduction in the area of fibrosis compared to 9% of placebo-treated patients (n = 86, p