The combination of CpG and TLR9 induces the secretion of local cytokines and chemokines, recruiting and activating immune cells of the innate immune response to stimulate the antitumor immune response; additionally, NK cells and CTLs could kill tumor cells directly or use IFN-γ or granzyme B to kill tumor cells [37, 38]. This evidence concerns the gene TLR9 and neoplasm.