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). This evidence concerns the gene CXCR2 and colorectal cancer.