Cabozantinib (XL184, BMS-90735

XL184 has weak inhibitory activity against RON and PDGFRβ with IC50 of 124 nM and 234 nM, respectivey, and has low activity against FGFR1 with IC50 of 5.294 μM. ^[1] XL184 at low concentration (0.1-0.5 μM) is sufficient to induce marked inhibition of constitutive and inducible Met phosphorylation and its resultant downstream signaling in MPNST cells, and inhibit HGF-induced MPNST cell migration and invasion. XL184 also induces marked inhibition of Met and VEGFR2 phosphorylation in cytokine-stimulated human umbilical vein endothelial cells (HUVECs). Although XL-184 has no significant effect on MPNST cell growth at 0.1 μM, XL184 at 5-10 μM significantly inhibits the MPNST cell growth. ^[2]