CXCR2 and neoplasm: Inflammatory CC (CCL2, CCL3, CCL5) and CXC (CXCL1, CXCL2, CXCL5, CXCL6, and CXCL8) chemokines recruit at the tumor site CCR2+ monocytes and CXCR2+ neutrophils that differentiate into tumor associated macrophages (TAMs) and tumor associated neutrophils (TANs), exerting pro- or anti-tumoral role (7–10).