2​ Biological Activity XL-184 free base (Cabozantinib) is a potent multitargeted VEGFR2, Met, FLT3, Tie2, Kit and Ret inhibitor with IC50 of 0.035, 1.8, 14.4, 14.3 and 4.6 nM for VEGFR2, Met, FLT3, Tie2 and Kit, respectively. In cells XL-184 free base (Cabozantinib) is also very potent, with IC50 under 10 nM for VEGFR2, MET, Kit and FLT3-ITD mechanistic assays. In in vitro angiogenesis assays, XL-184 free base (Cabozantinib) exhibits single-digit nanomolar potency. In mouse xenograft models, XL-184 free base (Cabozantinib), dosed orally, demonstrated dose-dependent inhibition of tumor growth and tumor regression, associated with disruption of the tumor vasculature and extensive tumor cell apoptosis. 3​ References: The pharmacological and toxicological properties of this product have not been fully investigated. Exercise caution in use and handling. This product must not be used in humans.