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Kaplan‐Meier estimates of OS among patients with no PD‐L1 expression (TPS < 1%): (A) OS for patients who received pembrolizumab plus chemotherapy versus chemotherapy alone and (B) subgroup analysis of OS. ECOG indicates Eastern Cooperative Oncology Group; OS, overall survival; PD‐L1, programmed death ligand 1; TPS, tumor proportion score.
