NCIt definition : An Fc-engineered monoclonal antibody directed against human CD20 with potential antineoplastic
activity. Ocaratuzumab specifically binds to CD20 antigen (B1), preventing mitogen-induced
B-cell proliferation; inhibiting B-cell differentiation; and promoting antibody-dependent
cell-mediated cytotoxicity (ADCC) and apoptosis of B cells expressing CD20. The Fc
portion of this monoclonal antibody has been engineered to possess a higher binding
affinity for variant Fc receptors on T helper cells, resulting in an augmentation
of the anti-tumor immune response. Because of Fc engineering, this agent may be significantly
more potent than rituximab in inducing B cell-directed ADCC. CD20 is a non-glycosylated
cell surface phosphoprotein that is exclusively expressed on B cells during most stages
of B cell development.;