CD274 and non-small cell lung carcinoma: Of 377 patients with metastatic nonsquamous NSCLC, 105 (28%), 104 (28%), and 103 (27%) had programmed death-ligand 1 (PD-L1) expression ≥50%, 1–49%, and <1%, respectively; PD-L1 expression was not documented for 65 patients (17%).