FDA Extends Review of TG Therapeutics Submissions
FDA has extended by three months its review of a TG Therapeutics BLA and supplemental NDA for ublituximab in combination with Ukoniq (umbralisib) as a treatment for patients with chronic lymphocytic leukemia (CLL) and small lymphocytic lymphoma (SLL). The agency told the company that updated overall survival analyses, which were submitted last month, constituted a major amendment to the applications. The review extension is intended to give FDA additional time to review the analyses. The new user fee review action target date is 6/25.
The company says FDA has also notified it of potential questions related to the submissions that could come up at an upcoming Oncology Drugs Advisory Committee (ODAC) meeting, which include: “the benefit-risk of the U2 combination in the treatment of CLL or SLL, and the benefit-risk of Ukoniq in relapsed/refractory marginal zone lymphoma (MZL) or follicular lymphoma (FL). In addition, as part of the benefit-risk analysis, the overall safety profile of the U2 regimen, including adverse events (serious and Grade 3-4), discontinuations due to adverse events, and dose modifications, is expected to be reviewed. The FDA’s concern giving rise to the ODAC meeting appears to stem from an early analysis of overall survival from the UNITY-CLL trial.”
Additionally, TG Therapeutics explains that overall survival was designated as a secondary efficacy outcome in the UNITY-CLL protocol but was not part of the primary analysis under a Special Protocol Assessment. “As part of the ongoing review of the BLA/sNDA, the FDA requested an early analysis of overall survival from the UNITY-CLL trial,” it continues. “As of 9/2021, the cut-off date for the overall survival analysis requested by the FDA during their review, there was an imbalance in favor of the control arm (HR: 1.23) though this result was not statistically significant. However, when excluding deaths related to Covid-19, the two arms were approximately balanced (HR: 1.04) with again no statistically significant difference between the treatment groups with regard to overall survival.”