Sesen Bio Announces Successful Pre-BLA Meeting with FDA for Vicinium®

Sesen Bio has completed a successful Type B Pre-Biologics License Application (BLA) meeting regarding the approval path for Vicinium for the treatment of patients with high-risk, Bacillus Calmette-Guérin (BCG) unresponsive, non-muscle invasive bladder cancer (NMIBC). The Company has reached alignment with the U.S. Food and Drug Administration (FDA) on an Accelerated Approval Pathway for Vicinium along with Rolling Review, and the Company expects to initiate submission of the BLA in the fourth quarter of 2019. The FDA also indicated that the nonclinical data, the clinical pharmacology data, and the safety database are sufficient to support a BLA submission, and that no additional clinical trials are necessary for a BLA submission.

Rolling Review of the BLA enables individual modules to be submitted and reviewed on an ongoing basis, rather than waiting for all sections to be completed before submission. The final module submission for the BLA will be CMC, and Sesen Bio plans to meet with the FDA in the second half of 2019 to discuss the content and timing of that module.

"We have now had two successful meetings with the FDA over the last three weeks, which build on our long-term relationship with the Agency and make our regulatory path forward for Vicinium even more clear," said Dr. Thomas Cannell, president and chief executive officer of Sesen Bio. "Gaining alignment with the FDA on an Accelerated Approval Pathway, in addition to a rolling review of the BLA, significantly increases our confidence in our regulatory pathway and our ability to bring a product to market that has the potential to save and improve the lives of patients."

On May 21, 2019 Sesen Bio announced a positive outcome from its previous meeting with the FDA, a Type C CMC meeting, where Sesen Bio reached agreement with the FDA on the Analytical Comparability Plan, and confirmed, subject to final comparability data to be provided in the BLA submission, that no additional clinical trials were deemed necessary for comparability.

Sesen Bio plans to schedule two additional meetings with the FDA in the second half of 2019, a Type C meeting to discuss the details of a post-marketing confirmatory trial in support of the Accelerated Approval Pathway for Vicinium, and a Type B CMC meeting to discuss the submission strategy of the CMC module.

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