They found that mouse CCL9 (mCCL9)-expressing CRC cells recruited myeloid cells expressing CCR1, the cognate receptor of mCCL9, to form early metastatic foci in the liver, and that four distinct types of myeloid cells were recruited to the site of liver metastasis: CCR1+ neutrophils, monocytes, eosinophils, and fibrocytes. This evidence concerns the gene CCR1 and colorectal carcinoma.