Citius Pharma Gets Complete Response Letter

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FDA has issued Citius Pharmaceuticals a complete response letter on its BLA seeking approval for Lymphir (denileukin diftitox), an engineered interleukin-2 diphtheria toxin fusion protein for treating patients with relapsed or refractory cutaneous T-cell lymphoma after at least one prior systemic therapy. The letter says that the company needs to “incorporate enhanced product testing, and additional controls agreed to with the FDA during the market application review,” according to the company. “Importantly, there were no concerns relating to the safety and efficacy clinical data package submitted with the BLA, or the proposed prescribing information.”

Lymphir is described as a recombinant fusion protein that combines the interleukin-2 (IL-2) receptor binding domain with diphtheria toxin fragments. “The agent specifically binds to IL-2 receptors on the cell surface, causing diphtheria toxin fragments that have entered cells to inhibit protein synthesis,” Citius says.

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