Tivozanib (AV-951; KRN951) is a selective and orally active VEGFR tyrosine kinase inhibitor with IC50 of 0.21, 0.16, 0.24 nM for VEGFR-1, VEGFR-2, VEGFR-3, respectively. Tivozanib inhibits angiogenesis and vascular permeability in tumor tissues and shows antitumor activity. Tivozanib has the potential for the research of metastatic renal cell carcinoma (RCC) .