CCL8 and colorectal carcinoma: Recent work has highlighted that tumour-associated macrophages enhance tumour progression and increase monocyte infiltration into the tumour site by CCL8.45 Another study has reported that soluble factors released by CRC cells can change tumour-specific genetic signatures in circulating monocytes.46 Tumour necrosis can provoke systemic inflammatory response, and represent poor outcomes in CRC.47 Gurthrie and co-workers found that tumour necrosis is related with IL-6, IL-10, VEGF and mGPS.48 In these ways, systemic inflammation may be connected with tumour microenvironment.