HGF and neoplasm: Previous studies were mainly focused on understanding how Ets1 expression is regulated by factors within tumor microenvironment such as hepatocyte growth factor (HGF), basic fibroblast growth factor (bFGF), vascular endothelial growth factor (VEGF), Platelet-derived growth factor-BB (PDGF-BB), and transforming growth factor beta (TGFβ)19–22.