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FDA Grants Priority Review to Merck’s Application for KEYTRUDA® (pembrolizumab) Plus Chemotherapy as First-Line Treatment of Patients With Unresectable Advanced or Metastatic Malignant Pleural Mesothelioma

Published: 2024-05-29 11:15:00 ET
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Acceptance based on results from the pivotal Phase 3 CCTG IND.227/KEYNOTE-483 trial, which demonstrated a statistically significant improvement in overall survival versus chemotherapy alone in these patients

RAHWAY, N.J.--(BUSINESS WIRE)-- Merck (NYSE: MRK), known as MSD outside of the United States and Canada, today announced the U.S. Food and Drug Administration (FDA) has accepted for priority review a new supplemental Biologics License Application (sBLA) seeking approval for KEYTRUDA, Merck’s anti-PD-1 therapy, in combination with chemotherapy, for the first-line treatment of patients with unresectable advanced or metastatic malignant pleural mesothelioma. The FDA has set a Prescription Drug User Fee Act (PDUFA), or target action, date of September 25, 2024.

The sBLA is based on data from the pivotal Phase 2/3 IND.227/KEYNOTE-483 trial. Results from the final analysis of the study, presented at the 2023 American Society of Clinical Oncology (ASCO) Annual Meeting, showed KEYTRUDA in combination with chemotherapy demonstrated a statistically significant improvement in overall survival (OS), reducing the risk of death by 21% (HR=0.79 [95% CI, 0.64-0.98]; two-sided p value=0.0324), with a median OS of 17.3 months (95% CI, 14.4-21.3) versus 16.1 months (95% CI, 13.1-18.2) for chemotherapy alone. KEYTRUDA plus chemotherapy also demonstrated a significant improvement in progression-free survival (PFS) (HR=0.80 [95%CI, 0.65-0.99], two-sided p value = 0.0372; median PFS 7.13 months versus 7.16 months respectively) and objective response rate (ORR) compared to chemotherapy alone. At 12 months, the estimated PFS rate was 26% for KEYTRUDA plus chemotherapy versus 17% for chemotherapy alone. The ORR was significantly higher for KEYTRUDA plus chemotherapy versus chemotherapy alone (62% versus 38%, p