Enzyvant Resubmits BLA for Pediatric Congenital Athymia
Enzyvant has resubmitted a BLA for RVT-802 (cultured human thymus tissue), a tissue-based regenerative therapy designed to treat pediatric congenital athymia, a rare and deadly condition associated with complete DiGeorge anomaly, Charge syndrome, and FoxN1 deficiency, according to the company. The submission addresses a 12/2019 Complete Response Letter and FDA requests related to chemistry, manufacturing and controls information. The agency set a review action target date of 10/8.
Children with congenital athymia are born without a thymus, resulting in a severe immunodeficiency due to the inability to produce normally functioning T cells, which defend against infection and regulate essential processes in the immune system, Enzyvant says. RVT-802 works, it says, by stimulating the body’s production of naive, immunocompetent T cells, with the goal of bolstering the immune system and restoring the body’s ability to fight infection.
RVT-802 is derived from infant thymus tissue, and it is processed and cultured prior to implantation into a patient’s quadricep muscle, the company says “The patient’s bone marrow stem cells migrate to the implanted tissue product, where they are trained to become naïve, immunocompetent T cells,” it says. “With the renewed ability to generate T cells, immune system function can be restored.”