A humanized monoclonal antibody directed against the human insulin-like growth factor-1 receptor (IGF-1R/CD221) with potential antineoplastic activity. Anti-IGF-1R monoclonal antibody AVE1642 specifically binds to and blocks membrane-bound IGF-1R, preventing the binding of the natural ligand IGF-1 and the subsequent activation of PI3K/AKT signal transduction, which may result in the induction of apoptosis and a decrease in cellular proliferation. Activation of IGF-1R , a receptor tyrosine kinase of the insulin receptor superfamily overexpressed by various cancer cell types, stimulates cell proliferation, promotes angiogenesis, enables oncogenic transformation, and suppresses apoptosis. Check for active clinical trials using this agent. (NCI Thesaurus)