Vandetanib is an antagonist of VEGFR and EGFR families. Specifically inhibits kinase activity of Flk-1. It is also an inhibitor of Flt-4. Vandetanib is not sensitive to PDGFR beta, Flt1, Tie-2 and FGFR1, while almost has no activity against MEK, CDK2, c-Kit, erbB2, FAK, PDK1, Akt and IGF-1R.