CCL5 and colorectal carcinoma: We also analyzed the expression of Ccl5 and Ccl2, two genes encoding chemokines that recruit mostly monocytes/macrophages, myeloid-derived suppressive cells (MDSC) and regulatory T cells (Treg) cells,28 as well as Cxcl1, encoding a chemokine responsible for neutrophil infiltration (for review on chemokines in CRC see29).