• Gerald J Roth, Armin Heckel, Florian Colbatzky, Sandra Handschuh, Jörg Kley, Thorsten Lehmann-Lintz, Ralf Lotz, Ulrike Tontsch-Grunt, Rainer Walter, and Frank Hilberg.
• Department of Chemical Research, Boehringer Ingelheim Pharma GmbH &Co KG, D-88397 Biberach, Germany.
• J. Med. Chem. 2009 Jul 23; 52 (14): 4466-80.

AbstractInhibition of tumor angiogenesis through blockade of the vascular endothelial growth factor (VEGF) signaling pathway is a new treatment modality in oncology. Preclinical findings suggest that blockade of additional pro-angiogenic kinases, such as fibroblast and platelet-derived growth factor receptors (FGFR and PDGFR), may improve the efficacy of pharmacological cancer treatment. Indolinones substituted in position 6 were identified as selective inhibitors of VEGF-, PDGF-, and FGF-receptor kinases. In particular, 6-methoxycarbonyl-substituted indolinones showed a highly favorable selectivity profile. Optimization identified potent inhibitors of VEGF-related endothelial cell proliferation with additional efficacy on pericyctes and smooth muscle cells. In contrast, no direct inhibition of tumor cell proliferation was observed. Compounds 2 (BIBF 1000) and 3 (BIBF 1120) are orally available and display encouraging efficacy in in vivo tumor models while being well tolerated. The triple angiokinase inhibitor 3 is currently in phase III clinical trials for the treatment of nonsmall cell lung cancer.

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