Mesoblast BLA Gets Complete Response Letter for Remestemcel-L
FDA has issued Mesoblast a complete response letter on its BLA for remestemcel-L for treating pediatric steroid-refractory acute graft versus host disease. The agency letter recommended that the company conduct at least one additional randomized, controlled study in adults or children to provide further evidence of the therapy’s effectiveness. Additionally, FDA identified a need for further scientific rationale to “demonstrate the relationship of potency measurements to the product’s biologic activity,” the company says. “Assays measuring the potency of remestemcel-L will continue to be refined to provide further scientific rationale for its use in severe inflammatory diseases with high mortality risk,” it says.
In August, FDA’s Oncologic Drugs Advisory Committee voted nine to one in favor of approving the therapy. The positive vote negated FDA briefing documents that challenged the biologic’s effectiveness and durability of patient responses (see earlier story).
Mesoblast is currently conducting a Phase 3 trial evaluating remestemcel-L in up to 300 ventilator-dependent adults with moderate to severe acute respiratory distress syndrome due to Covid-19. An interim analysis by the trial’s independent data safety monitoring board is expected early next month, with completion of patient enrollment expected in December.