An orally bioavailable multiple-receptor tyrosine kinase inhibitor. AEE788 inhibits phosphorylation of the tyrosine kinases of epidermal growth factor receptor (EGFR), human epidermal growth factor receptor 2 (HER2), and vascular endothelial growth factor receptor 2 (VEGF2), resulting in receptor inhibition, the inhibition of cellular proliferation, and induction of tumor cell and tumor-associated endothelial cell apoptosis. Check foractive clinical trials using this agent. OR A substance that is being studied in the treatment of cancer. It belongs to the families of drugs called protein tyrosine kinase inhibitors and angiogenesis inhibitors.