Regeneron Pharmaceuticals, Inc. (NASDAQ: REGN) announced that the U.S. Food and Drug Administration (FDA) has accepted for review the supplemental Biologics License Application (sBLA) for PD-1 inhibitor Libtayo (cemiplimab-rwlc) in combination with chemotherapy as first-line treatment in advanced non-small cell lung cancer (NSCLC). The target action date for the FDA decision is September 19, 2022.

The sBLA is supported by results from a randomized, multicenter Phase 3 trial that investigated Libtayo in combination with a physician's choice of platinum-doublet chemotherapy (Libtayo combination), compared to platinum-doublet chemotherapy alone. Enrolled patients (n=466) had locally advanced or metastatic NSCLC, irrespective of PD-L1 expression level or tumor histology, and with no ALK, EGFR or ROS1 aberrations. A regulatory filing has also been recently submitted to the European Medicines Agency.

The Phase 3 trial supporting the sBLA was stopped early after the Libtayo combination demonstrated a significant overall survival improvement compared to chemotherapy alone. Results were presented at the European Society for Medical Oncology Virtual Congress in 2021. Among patients in the Libtayo combination (n=312) and chemotherapy alone (n=154) groups, treatment discontinuations due to adverse events (AEs) occurred in 5% and 3% of patients, respectively. Immune-mediated AEs occurred in 19% of patients in the Libtayo combination group.

Notably, the Phase 3 trial was designed to include baseline characteristics seen in everyday clinical practice. Among those enrolled, 43% had tumors with squamous histology, 67% had tumors with

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