WARMISTER - Arbutus Biopharma Corporation (Nasdaq: ABUS) ('Arbutus' or the 'Company'), a clinical-stage biopharmaceutical company leveraging its extensive virology expertise to develop a functional cure for people with chronic hepatitis B virus (cHBV) infection, announced new preliminary end-of-treatment (EOT) data from the Phase 2a clinical trial (IM-PROVE II, AB-729-202) in patients receiving ongoing standard-of-care nucleos(t)ide analogue (NA) therapy indicating that treatment with imdusiran, Arbutus' RNAi therapeutic, followed by Barinthus Biotherapeutic's T-cell stimulating immunotherapeutic, VTP-300, was generally safe, well-tolerated and led to maintenance of lower HBsAg levels during the post-treatment follow-up period in patients with cHBV.

The data were presented today by Dr. Kosh Agarwal, MD, Consultant Hepatologist and Transplant Physician at the Institute of Liver Studies at King's College Hospital, London, during a session focused on new treatments for viral hepatitis B at the European Association for the Study of the Liver (EASL) Congress.

Dr. Agarwal presented the following data from 38 of 40 patients that were on stable NA therapy throughout the treatment period, received imdusiran (60mg every 8 weeks) for 24 weeks and were then randomized to receive either VTP-300 (treatment arm) or placebo at Weeks 26 and 30: Robust reductions of HBsAg were seen during the imdusiran lead-in period (-1.8 log10 by week 26) with 95% of patients achieving HBsAg

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