Complete Response Letter for 4-Dose Heplisav-B
FDA has issued a complete response letter to Dynavax Technologies for its sBLA for a four-dose Heplisav-B vaccine (hepatitis B vaccine [recombinant] adjuvanted) regimen for adults on dialysis. A company statement says FDA said the application did not provide sufficient data to support the full evaluation of the effectiveness or safety of the four-dose regimen.
The letter says data from the Phase 1 HBV-24 trial were insufficient due to the destruction of data source documents by a third-party clinical trial site operator for about half the subjects enrolled in the trial, Dynavax says. In addition, it says, the total number of subjects in the single-arm study was deemed to be insufficient to evaluate the safety of the four-dose regimen.
The company says it plans to request a meeting with FDA to evaluate the options for providing additional data to support the four-dose regimen for the dialysis population.
Heplisav-B is currently indicated to prevent infection caused by all known subtypes of hepatitis B virus in adults aged 18 and older.