PTPRC and neoplasm: ME49Δompdc/gra4 vaccination could prevent tumor growth by activating T cells, and antigen‐presenting cells (APCs), including conventional DCs (cDCs, CD11c+MHC2+), plasmacytoid DCs (pDCs, CD11c+B220+), macrophages (CD11b+F4/80+), and monocytes (CD11b+Ly6Chi).