CXCL12 and hepatocellular carcinoma: The well-identified HCC-derived cytokines, such as IL-4, IL-13, CSF-1, CCL2, CXCL12, connective tissue growth factor (CTGF) [32–34], induce TAMs differentiation from CCR2+ inflammatory monocytes, alternatively activated macrophages (AAMs) infiltration, then reduce innate or adaptive immunity [34, 35].