FDA Seeks More Information About RDEB Rx Under Review

The US Food and Drug Administration (FDA) has issued a complete response letter (CRL) regarding the Biologics License Application (BLA) for prademagene zamikeracel (pz-cel), which is under review for the treatment of patients with recessive dystrophic epidermolysis bullosa (RDEB), requesting more information from the manufacturer.

Pz-cel, which comprises autologous, COL7A1 gene–corrected epidermal sheets, is being evaluated for its ability to enable normal type VII collagen expression in a patient's skin cells and to facilitate wound healing and pain reduction in wounds in patients with RDEB after a one-time application procedure. The cause of RDEB is a defect in the COL7A1 gene that "results in the inability to produce type VII collagen," a press release from the manufacturer noted.

On April 22, 2024, the manufacturer Abeona Therapeutics announced that following a meeting with the FDA in March and in a subsequent request for information, the agency requires additional information to satisfy certain Chemistry Manufacturing and Controls requirements before the BLA for pz-cel can be approved. According to a press release from the company, the information pertains to validation requirements for certain manufacturing and release testing methods, including some that were observed during the FDA's pre-licensing inspection.

The CRL did not identify any issues related to the clinical efficacy or safety data in the BLA, and the FDA did not request any new clinical trials or clinical data to support approval, according to the company.

The company anticipates completing the BLA resubmission in the third quarter of 2024. The application is supported by clinical efficacy and safety data from the pivotal phase 3 VIITAL study and a phase 1/2a study in patients with RDEB.