SKLB1002 is a potent inhibitor of VEGF receptor 2 with IC50 value of 32 nM . VEGF receptor 2 (VEGFR2) is a major receptor for vascular endothelial growth factor (VEGF) and plays an important role in angiogenesis and VEGF-stimulated proliferation, migration, and sprouting of cultured endothelial cells . SKLB1002 is a potent VEGFR2 inhibitor. In human umbilical vein endothelial cells (HUVEC), SKLB1002 significantly inhibited VEGF-induced HUVEC proliferation with IC50 value of 11.9 μM. Also, SKLB1002 inhibited HUVEC migration, invasion and tube formation in a dose-dependent way. SKLB1002 (10 μM) significantly inhibited VEGF-induced phosphorylation of VEGFR2, ERK, Src and FAK . In zebrafish embryos, SKLB1002 (2.5 μM) significantly inhibited the growth of intersegmental vessels. In mice bearing SW620 or HepG2 xenografts, SKLB1002 (100 mg/kg) significantly inhibited tumor volume and inhibited tumor growth by 60%. Also, SKLB1002 reduced the microvessel density . In mice with 4T1 tumor, SKLB1002 significantly reduced the tumor vessel density .