A humanized monoclonal antibody directed against 1D10, a polymorphic determinant on the HLA-DR beta chain that is expressed on normal and neoplastic B cells. Apolizumab induces complement-mediated cytotoxicity, antibody-dependent cell-mediated cytotoxicity, and apoptosis of 1D10 antigen-positive B cells in vitro. Check for active clinical trials using this agent. (NCI Thesaurus)