CXCL6 and neoplasm: It has been assessed that almost every tumor type produces chemokines to attract cell trafficking into the solid tumor microenvironment via secreting chemokine (C–C motif) ligand 2 (CCL2), CCL3, CCL5, CCL7, CXCL8 (IL-8), macrophage inflammatory protein 1α (MIP-1α)/CCL3, and human granulocyte chemotactic protein-2 (huGCP-2/CXCL6) [25, 26].