– 90% of Adults with Chronic Hepatitis Delta Virus (HDV) who Achieved Undetectable HDV RNA at 96 Weeks of Treatment with Bulevirtide Remained Undetectable for Almost 2 Years After Stopping Treatment –
Gilead Sciences Inc. (Nasdaq: GILD) today announced final results from the pivotal Phase 3 MYR301 study revealing that 36% (23 out of 64) of adults living with chronic hepatitis delta virus (HDV) treated with the first-in-class entry inhibitor bulevirtide at either a 2 mg or 10 mg dose maintained virologic suppression for almost two years after stopping treatment after achieving undetectable HDV RNA at end of treatment (EOT). In participants who sustained undetectability for one year after end of therapy, no relapses occurred in the second year of follow-up. In addition, sustained post-treatment undetectable HDV RNA was more frequent in participants with longer on-treatment HDV RNA undetectability at end of treatment: 90% (9/10) of those who had HDV RNA undetectability for ≥ 96 weeks at end of treatment remained HDV undetectable off-treatment. These new data, presented at the European Association for the Study of the Liver (EASL) Congress 2025, show the potential value of bulevirtide monotherapy for some adults living with chronic HDV, even after treatment has ended.
“HDV is the most severe form of viral hepatitis with more rapid progression towards liver cancer and liver-related death. Previous data have demonstrated the potential of bulevirtide as a safe and effective treatment option and, as EASL and the European Medicines Agency guidelines recommend, continued treatment is encouraged as long as people are experiencing a clinical benefit,” said Professor Heiner Wedemeyer, Head and Chair of the Department of Gastroenterology, Hepatology, Infectious Diseases and Endocrinology at Hannover Medical School. “With today’s results, we’re now seeing the potential of bulevirtide to maintain virologic suppression and normalize markers of liver inflammation for a subset of people living with HDV, demonstrating a durable response, even after treatment cessation.”
The findings (LBO-004) build on data, presented at The Liver Meeting® 2024, hosted by the American Association for the Study of Liver Diseases (AASLD), from MYR301 which demonstrated a subset of participants treated with bulevirtide monotherapy had undetectable HDV RNA 48 weeks after stopping treatment. Today’s presentation adds further insight by not only showing the durability of response post-treatment, but that sustained undetectability was more frequent in people with longer, on-treatment HDV RNA undetectability at the time of bulevirtide discontinuation. Furthermore, post-treatment hepatic serious adverse events (SAEs) were reported in 14% (20/142) of participants but were resolved in 85% (17/20) of these participants, most of whom restarted bulevirtide therapy.
“At Gilead, we are committed to advancing research and exploring the full potential of bulevirtide as a monotherapy, in combination, and at different doses, to help improve outcomes for people living with chronic HDV,” said Anu Osinusi, Vice President, Clinical Research for Hepatitis, Respiratory and Emerging Viruses at Gilead. “Previous results from MYR301 demonstrated the potential benefits of long-term treatment with bulevirtide. With this new data, we now have valuable insight into the durability of the response even after treatment has ended.”
HDV affects an estimated 4.5% of people living with chronic hepatitis B (HBV), with an estimated global prevalence of 12 million people. Bulevirtide 2 mg remains the only approved treatment for adults with chronic HDV and compensated liver disease in the European Economic Area (EEA), the UK, Switzerland and Australia and is not approved in the U.S. or elsewhere. Bulevirtide 10 mg is an investigational product and is not approved anywhere.
For more information on the EASL Congress 2025 and Gilead’s presentations, please visit the congress website.
Marketing Authorization
In July 2023, the European Commission (EC) granted full Marketing Authorization (MA) for Hepcludex® (bulevirtide) 2 mg for the treatment of adults with chronic HDV and compensated liver disease. Bulevirtide was initially granted a conditional MA from the EC in July 2020 to provide people living with HDV urgent access to treatment. Bulevirtide’s conditional MA license in the UK was converted to a full MA in August 2023, and a full MA was granted in Switzerland in February 2024. In regions where bulevirtide is not approved, including the U.S., bulevirtide 2 mg is an investigational product. In these regions, health authorities have not established the safety and efficacy of bulevirtide. Bulevirtide 10 mg is an investigational product and is not approved anywhere globally.
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