FDA Extends Review on Dynavax Hepatitis B Vaccine
FDA has extended by three months its review of a Dynavax Technologies BLA for Heplisav-B, an investigational vaccine for immunizing adults against Hepatitis B infection. Earlier this month, the company submitted FDA-requested individual trial data sets that had earlier been provided as integrated data. The agency has now determined that the addition of these large data sets represented a major amendment to the BLA and extended the user fee action date to 12/15. The BLA is based on results from clinical trials that have generated data in more than 14,000 total participants.
In 2013, the agency issued Dynavax a complete response letter on the BLA, which specified that the indication in adults 18-70 years of age cannot be approved without further evaluation of safety in this broad age group, according to the company. “The FDA also continues to express concern that novel adjuvants may cause rare autoimmune events,” it said. In 2012, FDA’s Vaccines and Related Biological Products Advisory Committee voted (13 to 1) that the vaccine adequately demonstrated immunogenicity. However, the panel voted 8 to 5 with one abstention that there were insufficient data to adequately support the product’s safety.