CD274 and neoplasm: As the inflammatory cytokine of IFN‐γ can upregulate the expression of PD‐L1 in tumor cells and macrophages, we evaluated the PD‐L1 distribution in tumor tissue, finding that the total population of PD‐L1+ cells was highest in Gel@B‐B group and that in Gel@BAY and Gel@BMS group was higher than PBS group (Figure 5I; Figure S17, Supporting Information).