PD-L1 expression varied by the stage: TPS < 1%, 1% to 49% and ≥50% was 46%, 39% and 16% in stage I; 41%, 34%, and 25% in stage II; 35%, 37%, and 28% in stage III; 33%, 27%, and 40% in stage IV NSCLC. The gene discussed is CD274; the disease is non-small cell lung carcinoma.