CD274 and neoplasm: Here, stratified analysis identified PD-L1 expression in NSCLC tumor cells to be associated with improved prognosis for adjuvant therapy (p = 0.017; Fig 2C), tumor histology (pulmonary squamous cell carcinoma; p = 0.042; Fig 2D), increased tumor size (pT2-4; p = 0.039; Fig 2E) and lymph node status (pN1-3; p = 0.010; Fig 2F).