Core Insights - Arbutus Biopharma Corporation presented promising data on imdusiran and AB-101 at the EASL Congress 2025, indicating potential for functional cure in chronic hepatitis B patients [1][5] Group 1: Imdusiran and Clinical Trials - Imdusiran, when combined with VTP-300 and low-dose nivolumab, has shown to achieve functional cure in chronic hepatitis B (cHBV) patients [1] - In the Phase 2a clinical trial (IM-PROVE II), patients receiving imdusiran (60mg every 8 weeks) demonstrated significant reductions in HBsAg levels, with 25% of patients in the group receiving nivolumab achieving functional cure [2][7] - A total of 8 patients across all Phase 2a trials have been reported to achieve functional cure, with 7 of these having baseline HBsAg levels below 1000 IU/mL [3] Group 2: AB-101 and Safety Profile - AB-101, an oral PD-L1 inhibitor, has been shown to be generally safe and well-tolerated in a Phase 1a/1b clinical trial, with no liver dysfunction reported in cHBV patients [1][4] - Data from the first cohort of cHBV patients indicated that daily dosing of 10mg of AB-101 for 28 days was well tolerated, with no immune-related adverse events reported [4][10] Group 3: Background on Hepatitis B and Arbutus - Chronic hepatitis B infection represents a significant unmet medical need, affecting over 250 million people globally, with approximately 1.1 million deaths annually from related complications [11] - Arbutus Biopharma is focused on developing innovative therapies for infectious diseases, particularly chronic HBV infection, and is also involved in legal actions to protect its intellectual property [12]

Core Insights - Arbutus Biopharma Corporation announced the acceptance of five abstracts for presentation at the EASL Congress 2025, including one late-breaker, highlighting the company's ongoing research in hepatitis B treatments [2][9]. Group 1: Abstract Presentations - Five abstracts will be presented in the Viral Hepatitis B and D session on May 8, 2025, showcasing new therapies and strategies [3]. - The late-breaker abstract will focus on the antiviral efficacy and safety of imdusiran followed by VTP-300 in chronic hepatitis B subjects [9]. Group 2: Key Findings from Abstracts - Abstract 1768 discusses the factors associated with functional cure in chronic hepatitis B subjects, indicating that baseline HBsAg levels are significant [4]. - Abstract 2043 reveals that rapid HBV RNA decline during treatment with imdusiran and interferon is linked to HBsAg seroclearance [6]. - Abstract 1990 presents the pharmacokinetics and pharmacodynamics of AB-101, showing it to be safe and well-tolerated with dose-responsive increases in PD-L1 receptor occupancy [7]. - Abstract 1978 indicates that AB-101 is well-tolerated in both healthy and chronic hepatitis B subjects, with ongoing dosing studies [8]. Group 3: Product Information - Imdusiran is an RNAi therapeutic designed to reduce HBV viral proteins, showing promising results in Phase 2a trials for achieving functional cure rates [10]. - AB-101 is an oral PD-L1 inhibitor currently in Phase 1a/1b trials, aimed at reactivating exhausted HBV-specific T-cells [11]. Group 4: Industry Context - Chronic hepatitis B infection affects over 250 million people globally, representing a significant unmet medical need, with approximately 1.1 million deaths annually from related complications [12].