CXCL9 and neoplasm: In addition, some APCs such as cDC1s (a subset of conventional dendritic cells) can also produce chemokines including CXCL9 and CXCL10 to recruit T cells to tumor microenvironment.11 Nature killer cells (NK cells), another important class of innate immune cells, can kill targeted tumor cells, secrete anti-tumor cytokines, and also contribute to the infiltration of cDC1s into tumors.12