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The maleate salt form of henatinib, an orally bioavalable, multitargeted tyrosine kinase inhibitor with potential antitumor and antiangiogenic activities. Henatinib inhibits vascular endothelial growth factor receptor type 2 (VEGFR2), a tyrosine kinase receptor upregulated in many tumor cells that plays a key role in angiogenesis. This may result in an inhibition of angiogenesis and eventually tumor cell proliferation. Henatinib, structurally similar to sunitinib, also inhibits, though to a lesser extent, mast/stem cell growth factor receptor (c-Kit) and, platelet-derived growth factor receptor (PDGFR) alpha and beta.
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