Interestingly, when human CCR1 and CXCR2 were examined, data from a public database of single-cell data from human colorectal cancers (https://singlecell.broadinstitute.org/single_cell) revealed the presence of myeloid cells positive for both CCR1 and CXCR2 at the primary site of colorectal cancer (Supplementary Fig. 1b). Here, CCR1 is linked to colorectal cancer.