Replimune Group IncREPL
▲ PositiveRegulationrelevance
FDA accepted BLA for RP1 in advanced melanoma, a regulatory milestone after prior rejections.

The FDA has accepted Replimmune Group's third biologics license application for RP1 combined with nivolumab to treat advanced melanoma, with a response expected by August 2, 2026. The company previously received complete response letters in July 2025 and April 2026, the latter due to a disagreement over trial assessment methodologies. RP1 is an attenuated herpes simplex virus designed to target tumor antigens, and it showed positive results in the Phase 3 IGNYTE trial with nivolumab in patients who had prior anti-PD-1 therapy. An advisory committee meeting is planned for July 2026.
Replimune Group IncFDA accepted BLA for RP1 in advanced melanoma, a regulatory milestone after prior rejections.