CXCR1 and neoplasm: The cytokine CC ligand 2 (CCl2), a chemokine associated with tumor progression in a variety of cancer types [27–29], also known as human monocyte chemotactic protein 1 (MCP-1), is a member of the CC chemotactic family and a known chemokine that recruits monocytes/macrophages to sites of inflammation [30].