Definition

A bispecific, Fc domain-containing, monoclonal antibody with potential antineoplastic activity. Plamotamab contains two antigen-recognition sites: one for human CD3, a T cell surface antigen, and one for human CD20, a tumor-associated antigen (TAA) that is exclusively expressed on B cells during most stages of B-cell development and is often overexpressed in B-cell malignancies. Upon administration, plamotamab binds to both T cells and CD20-expressing B-lineage tumor cells. The resulting cross-linkage may trigger a potent cytotoxic T-lymphocyte (CTL) response against the CD20-expressing tumor B cells. Inclusion of an Fc domain on the antibody prolongs the half-life of the bispecific antibody and enhances T-cell-mediated tumor cell killing because the agent is able to bind to Fc receptors.