Reviewers Still See Heplisav Safety Concerns

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FDA medical reviewers say that Dynavax’ hepatitis B vaccine Heplisav-B (hepatitis B vaccine recombinant and 1018 ISS adjuvant) is effective, but still has potential safety issues. The reviewers’ assessment is in a briefing document released in advance of a 7/28 Vaccines and Related Biological Products Advisory Committee meeting to consider the Heplisav BLA.

The document notes that there were more deaths and serious cardiac events in clinical trial patients who received Heplisav than in those who received GlaxoSmithKline’s Energix-B, a comparator product. However, the reviewers also said that overall numbers and rates of adverse events were low, and there were limitations in the evaluation of cardiac events that “limits the causal interpretation of these observations.”

The briefing says that FDA has twice rejected the vaccine because of unresolved safety concerns. Dynavax conducted additional clinical trials to try to respond to the agency’s concerns.

Dynavax is seeking an indication for active immunization against all subtypes of hepatitis B virus infection in adults age 18 and older. Advisory committee members will be asked to consider the vaccine’s safety and the company’s proposed pharmacovigilance plan, with a particular focus on the pre-licensure safety data to support licensure.

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