In a mouse model of liver metastasis, mCCL9-expressing CRC cell lines recruit CCR1+ myeloid cells to expand metastatic foci in the liver [39], and four distinct types of myeloid cells are found to be recruited to the liver metastatic foci: CCR1+ neutrophils, eosinophils, monocytes and fibrocytes [41]. This evidence concerns the gene CCR1 and colorectal carcinoma.