CD274 and non-small cell lung carcinoma: Once confidence in PD-L1 staining was established in repeated placenta tissues, we compared staining in seven NSCLC patient tissues (patients ‘A’ through ‘G’) with the Ventana SP263 antibody and RK-10-Biotin (Figs 8 and S21–29 When using the RK-10-Biotin peptide we saw heaviest staining localized to the tumor regions of the tissues, which can be very intense based on the concentration of peptide used.