To confirm this result, we also pre‐cocultured BMDCs with either the control or Arf1‐ablated tumor cells in the presence of OVA and then re‐cocultured the treated BMDCs with naïve CD8+ OT1 T cells, we observed similar increases of the tumor antigen‐specific CD8+ T cells and IFNγ production (Figure 5f). This evidence concerns the gene ARF1 and neoplasm.