The findings indicate that MSCs express a primary receptor also known as the vascular endothelial growth factor receptor 1 (VEGFR1 or Flt-1) on their surface, which is involved in promoting tumor angiogenesis.170 Implantation of BM derived MSCs and AT derived MSCs presented controversial outcome in which AT-MSCs stimulate tumor growth and metastatic aggression of cancer while BM-MSCs transplantation presented different effects. This evidence concerns the gene FLT1 and neoplasm.