CXCL12 and neoplasm: SDF‐1/CXCR4 has an important role in a variety of biological processes such as immunity, inflammation, embryonic development, and organogenesis, as well as in tumor growth or metastasis, HIV disease, and WHIM (warts, hypogammaglobulinemia, infections, and myelokathexis) syndrome.3, 29, 30, 31