KDR and cancer: In this present review, the dramatic effects of saponins have been described on inhibiting the growth and metastasis of cancer via inhibiting the gene expression of angiogenesis mediators, including VEGF/VEGFR2, HIF-1α, fibroblast growth factor 2 (FGF2), and phosphoinositide 3-kinases/protein kinase B (PI3K/Akt).