Sesen Bio, a late-stage clinical company developing targeted fusion protein therapeutics for the treatment of patients with cancer, today reported updated, preliminary primary and secondary endpoint data from the Company’s Phase 3 VISTA trial further supporting the strong benefit-risk profile of Vicinium for the potential treatment of patients with high-risk, bacillus Calmette-Guérin (BCG) unresponsive, non-muscle invasive bladder cancer (NMIBC).
The updated preliminary Phase 3 clinical data will serve as the basis for the anticipated initiation of the Company’s BLA submission in 4Q 2019
“After two very positive meetings with the FDA in the second quarter, we are now focused on initiating the BLA submission for Vicinium in the fourth quarter under an Accelerated Approval pathway with Rolling Review,” said Dr. Thomas Cannell, president and chief executive officer of Sesen Bio.
“We believe this regulatory pathway and our strong 12-month Phase 3 data could potentially expedite patient access to Vicinium, which is particularly important in light of the ongoing BCG shortage. We look forward to our two additional face-to-face meetings with the FDA in the fourth quarter as we work to bring Vicinium to market to help save and improve the lives of patients with NMIBC.”
Phase 3 VISTA Trial Progress
Updated Primary and Secondary Endpoint Data from Phase 3 VISTA Trial Support a Growing Body of Evidence Demonstrating the Clinically Meaningful Anti-tumor Activity of Vicinium: In May, Sesen Bio announced updated preliminary data from its ongoing Phase 3 VISTA trial, a single-arm, 24-month, multi-center clinical trial designed to support the approval of Vicinium for the treatment of patients with high-risk, BCG-unresponsive NMIBC.
The trial completed registration in the second quarter of 2018, with a total of 133 patients across three cohorts based on histology and time to disease recurrence after adequate BCG treatment (at least two courses of BCG with at least five doses in the first course and two doses in the second course). Primary efficacy endpoints consist of complete response rate and duration of response for patients in Cohort 1. Secondary efficacy endpoints include time to disease recurrence for patients in Cohort 3, and time to cystectomy, progression-free survival, event-free survival, and overall survival for patients across all cohorts.
Patients with Carcinoma in situ with or without papillary disease that was determined to be refractory or recurred within six months of their last course of adequate BCG.
Patients with Carcinoma in situ with or without papillary disease that was determined to be refractory or recurred after six months, but less than or equal to 11 months, after their last course of adequate BCG.
The VISTA trial is an open-label, multicenter, single-arm Phase 3 clinical trial evaluating the efficacy and tolerability of Vicinium® as a monotherapy in patients with high-risk, bacillus Calmette-Guérin, or BCG, unresponsive non-muscle invasive bladder cancer (NMIBC). The primary endpoints of the trial are the complete response rate and the duration of response in patients with Carcinoma in situ with or without papillary disease. Patients in the trial receive locally administered Vicinium twice a week for six weeks, followed by once-weekly treatment for another six weeks, then treatment every other week for up to two years.
Source: Company Press Release