CD274 and neoplasm: The tumor burdens induced by TC‐1 cells in C57BL/6 mice were almost completely suppressed by the Lm‐LLO‐E7 vaccine, the combined anti‐PD‐L1 mAb + Lm‐LLO‐E7 vaccine, or the combined anti‐PD‐L1 mAb + Lm‐LLO‐E6/E7 vaccine when compared with the control group.