Triple combination of muzastotug + atezolizumab + bevacizumab resulted in much higher overall response rates (ORR) compared to the atezolizumab + bevacizumab control arm (66.7% vs. 32.5%, respectively by Investigator per HCC-specific Modified RECIST v1.1) as 1L therapy in a Phase 1b/2 trial in locally advanced or metastatic and/or unresectable hepatocellular carcinoma (HCC) patients

Triple combination of muzastotug + pembrolizumab + fruquintinib exhibited a dose-dependent response (25% and 40% ORR for 10 mg/kg and 15 mg/kg, respectively) in a Phase 1b/2 trial in late-line microsatellite stable colorectal cancer (MSS CRC) patients

New data are further evidence that muzastotug's masking technology uncouples efficacy from typical anti-CTLA-4 toxicity; it reduces peripheral toxicity and allows high-dose anti-CTLA-4 therapy specifically within the tumor microenvironment (TME) to potentially improve efficacy of current immunotherapies in advanced HCC and MSS CRC patients

SAN DIEGO and SUZHOU, China, April 17, 2026 (GLOBE NEWSWIRE) -- Adagene Inc. ("Adagene") (NASDAQ:ADAG), a company transforming the discovery and development of novel antibody-based therapies, today presented new data from two ongoing Phase 1b/2 studies of muzastotug in triple combination regimens at the American Association of Cancer Research (AACR) annual meeting 2026, held April 17-22 in San Diego. Results support muzastotug's mechanistic advantages over traditional anti-CTLA-4 therapies, and its continued development as a potential backbone therapy in combination regimens for difficult-to-treat cancers. FDA has previously designated muzastotug in combination with Merck's (known as MSD outside of the United States and Canada) anti-PD-1 therapy, KEYTRUDA® (pembrolizumab), as a Fast Track product for adult patients with microsatellite stable metastatic colorectal cancer (MSS mCRC) without current or active liver metastases.