CD274 and squamous cell carcinoma: The expression of tumor PD-L1 was TPS ≥ 50% in 13 (41%) patients, 1–49% in 8 (25%), < 1% in 3 (9%), and not evaluated in 8 (25%) in adenocarcinoma; and ≥ 50% in 2 (17%), 1–49% in 4 (33%), < 1% in 2 (17%), and not evaluated in 4 (33%) in squamous cell carcinoma.