Polatuzumab vedotin-piiq (polatuzumab vedotin, DCDS4501A, RG7596) is an antibody-drug conjugate (ADC) composed of a monoclonal antibody against CD79b (a B cell receptor component) and the anti-mitotic cytotoxic agent monomethyl auristatin (MMAE). It is used for the treatment of relapsed/refractory diffuse large B-cell lymphoma (DLBCL).