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OS and PFS by M1a and M1b staging. Illustrated are Kaplan-Meier estimates of OS and PFS in patients with M1a stage NSQ-NSCLC (A and B) or M1b stage NSQ-NSCLC (C and D). Tick marks indicate censoring of data at the last time the patient was known to be alive. CI, confidence interval; HR, hazard ratio; NSQ-NSCLC, nonsquamous NSCLC; OS, overall survival; Pem, pemetrexed; Pembro, pembrolizumab; PFS, progression-free survival; Plat, platinum.
