CCL2 and neoplasm: Several chemokines derived from tumours (CCL2, CCL5, CCL11, CCL15, CXCL1, CXCL2, CXCL10 and CXCL12) can activate mast cell receptors (CCR2, CCR3, CXCR2, CXCR3 and CXCR4) to induce MC migration (34, 37–43).