CD274 and neoplasm: The expression of PD-L1 in the tumor tissues of the control, CDDP and HVJ-E intratumoral and subcutaneous administration, PD-1 antibody administration, PD-1 antibody and HVJ-E intratumoral and subcutaneous administration, and HVJ-E intratumoral and subcutaneous administration treatment groups was observed by immunohistochemistry (Figure S8).