Bone marrow adipocytes also secrete several pro-inflammatory mediators such as IL-1B, IL-6, leptin, adiponectin, vascular cell adhesion molecule 1 (VCAM-1), tumor necrosis factor alpha (TNF-alpha) and CXCL12 that increase bone tropism, proliferation, and survival of certain cancer cells [65, 68–70]. This evidence concerns the gene CXCL12 and cancer.