CXCL9 and breast neoplasm: Furthermore, genes specific for cDC1 correlate with the presence of CXCL9 expression by human tumors in the TCGA database (11, 13), and cDC1 in human breast tumors exhibit expression of CXCL9 by immunofluorescence (11), further indicating that human cDC1 are likely to produce similar chemokines and play a similar role in the tumor microenvironment as mouse cDC1.