LLC-MUC1-PDL1 and Panc02-MUC1-PDL1 tumor cell lines were inoculated into the right flank of the 6–8 weeks C57BL/6 mice, LLC-MUC1-PDL1 and Panc02-MUC1-PDL1 tumor cell lines for qPCR assay was shown in Supplementary Figure S1. The gene discussed is CD274; the disease is neoplasm.