CD274 and neoplasm: Purified TIL from anti-PD-L1 antibody treated mice co-cultured with 51Cr-labeled MC-38 tumor cells had higher cytotoxicity (27%) at 25:1 and 10:1 (22%) ratios compared to the TIL from tumors of NrIgG treated mice (18% at 25:1 and 8%.