CD274 and neoplasm: Immunohistochemistry: CK5/6 (+), p63 (+), P40 (+), p53 (-, mutant), Ki67 (+), approximately 50%, CK7 (-), TTF-1 (-), CD56 (-), ALK (-), programmed cell death ligand 1 (PD-L1) expression was positive, tumor Proportion Score: 83% (Figure 2).