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Ki: Flk-1trans-phosphorylation (2.1 mM), FGFR1 trans-phosphorylation (1.2 mM), and PDGFR autophosphorylation (0.008 mM).

Vascular endothelial growth factor, fibroblast growth factor (FGF), and platelet-derived growth factor (PDGF) and their cognate receptor tyrosine kinases are strongly implicated in angiogenesis associated with solid tumors. TSU-68 is a novel inhibitor of these receptors.

In vitro: Biochemical kinetic studies using isolated Flk-1, FGF receptor 1, and PDGF receptor β kinases revealed that TSU-68 has competitive inhibitory properties with respect to ATP. In cellular systems, TSU-68 inhibited receptor tyrosine phosphorylation and mitogenesis after stimulation of cells by appropriate ligands [1].

In vivo: Oral or i.p. administration of TSU-68 in athymic mice resulted in significant growth inhibition of a diverse panel of human tumor xenografts of glioma, melanoma, lung, colon, ovarian, and epidermoid origin [1].

Clinical trial: Phase I clinical study indicated that TSU-68 can be safely combined with standard doses of carboplatin-paclitaxel, with the combination manifesting promising antitumor activity [2].

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