NTF3 and neoplasm: Chemoattractants are mediators secreted by tumor cells, such as vascular endothelial growth factor (VEGF) and transforming growth factor (TGF) β1, as well as the cytokines interleukin (IL)-8 and neurotrophin-3 (NT-3) [14,15,16], which attract MSCs to the tumor microenvironment (TME).