PDCD1 and neoplasm: The H&E staining of tumor tissues of mice showed that, compared with the TC-1 + Ad-Contorl + IgG 2a group and TC-1 + Ad-Contorl + IgG 2b group, no significant differences in the thickness of tumor capsule were observed in monotherapy with PD-1/PD-L1 antibody (TC-1 + Ad-control + PD-1, TC-1 + Ad-control + PD-L1) (Figure 6A,B).