An inhibitor of PDGFRβ, VEGFR2, and FGFR1 (IC₅₀ = 0.06, 2.4, and 3.0 μM, respectively) but not EGFR (IC₅₀ >100 μM); suppresses tumor growth, blocks angiogenesis in tumors, and induces apoptosis of tumor vasculature and regression of established tumors; also…