KEYTRUDA® (pembrolizumab) is the first anti-PD-1 therapy to demonstrate statistically significant improvement in OS as a neoadjuvant and adjuvant treatment versus pre-operative chemotherapy for NSCLC Merck (NYSE: MRK), known as MSD outside of the United States and Canada, today announced the Phase 3 KEYNOTE-671 trial investigating KEYTRUDA, Merck’s anti-PD-1 therapy, as a perioperative treatment regimen for patients with resectable stage II, IIIA or IIIB (T3-4N2) non-small cell lung cancer (NSCLC) met its dual primary endpoint of overall survival (OS). At a pre-specified interim analysis, KEYTRUDA plus chemotherapy before surgery (neoadjuvant), followed by resection and KEYTRUDA as a single agent after surgery (adjuvant), demonstrated a statistically significant and clinically meaningful improvement in OS compared to neoadjuvant placebo plus chemotherapy followed by adjuvant placebo in these patients. The safety profile of KEYTRUDA was consistent with that observed in previously