Figure 2. Bone marrow signaling interacts with metastatic PCa CSCs.

BMSC: bone marrow stromal cell; HSC: hematopoietic stem cell; MSC: mesenchymal stem cell; ECM: extracellular matrix; VEGF: vascular endothelial growth factor; CXCL12: stromal derived factor 1 (SDF-1); GAS6: growth arrest protein 6; TGFβ: transforming growth factor beta; FGFs: fibroblast growth factors; BMPs: bone morphogenic proteins; IL: Interleukin, OPN: osteopontin; RANKL: receptor activator of nuclear factor kappa-B ligand.