CD274 and neoplasm: PD-L1 (n 1⁄4 158, using Ventana SP263 antibody). We evaluated PD-L1 expression as percentage of tumor cells with membranous staining (PD-L1-TC) and percentage of TILs with membranous or cytoplasmic staining (PD-L1-IC; relative to total TILs). PD-L1 positivity was defined as 1% in one or both percentages