CD274 and non-small cell lung carcinoma: In the present study, a total of 143 NSCLC patients received ICIs treatment, PD-L1 expression was tested in 32 patients (22.4%), among which 24 patients (16.8%) were positive (PD-L1 ≥ 1%) and 8 patients (5.6%) were negative, and therefore 111 patients (77.6%) had unknown expression status.