Background:

TAK-593 is a highly potent inhibitor of VEGFR2 with IC50 value of 0.95nM [1].

TAK-593 is an imidazo [1, 2-b] pyridazine derivative. It is found to inhibit VEGFR2 with a highly potent effect in the non-RI assay using the AlphaScreen system. And in the cell proliferation assay, TAK-593 suppresses VEGF-stimulated cell growth of HUVEC with IC50 value of 0.3nM. TAK-593 is a slow-binding inhibitor and it has a long residence time on VEGFR2. Besides that, TAK-593 also has efficacy on other receptor kinases. It gives the IC50 values of 3.2nM, 1.1nM, 4.3nM and 13nM for VEGFR1, VEGFR3, PDGFRα and PDGFRβ, respectively. Moreover, TAK-593 shows significant anti-tumor efficacy in the mouse xenograft model using A549 human lung adenocarcinoma epithelial cells. Oral administration of TAK-593 twice daily at doses of 0.25mg/kg for two weeks potently inhibits tumor growth with T/C value of 34% [1].

参考文献:
[1] Miyamoto N, Sakai N, Hirayama T, Miwa K, Oguro Y, Oki H, Okada K, Takagi T, Iwata H, Awazu Y, Yamasaki S, Takeuchi T, Miki H, Hori A, Imamura S. Discovery of N-[5-({2-[(cyclopropylcarbonyl)amino]imidazo[1,2-b]pyridazin-6-yl}oxy)-2-methylphenyl]-1,3-dimethyl-1H-pyrazole-5-carboxamide (TAK-593), a highly potent VEGFR2 kinase inhibitor. Bioorg Med Chem. 2013 Apr 15;21(8):2333-45.