CXCL12 and neoplasm: C-X-C Motif Chemokine Ligand 12 (CXCL12), a ligand for the G-protein-coupled receptors chemokine (C-X-C motif) receptor 4 (CXCR4) and CXCR7, plays a role in many diverse cellular functions, including embryogenesis, immune surveillance, inflammation response, tissue homeostasis, and tumor growth [1,2].