Mesoblast Refiling BLA for Remestemcel-L

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Mesoblast says it will refile next quarter its BLA for remestemcel-L for treating pediatric steroid-refractory acute graft versus host disease (SR-aGVHD) following favorable guidance from FDA regarding the company’s clinical data. On 8/4/2023, the agency issued a second complete response letter that requested more data to support marketing approval. The company now says that recent input from the agency found the available clinical data from the company’s Phase 3 study MSB-GVHD001 appears to be sufficient to support resubmission.

In 2020, FDA issued a complete response letter on the original BLA and 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 said at the time. “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 said.

Prior to the latest complete response action, 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).

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