CD274 and lung carcinoma: Taken together with our findings and a few studies of PD‐L1 concordance between cytology and histology,26, 27, 28, 29, 30, 31 lung cancer patients with positive PD‐L1 expression in the preoperative or diagnostic cytology do not need to repeat the test using the surgical resection specimens, at least using the cut‐off of 1%.