rituximab [ CD20 antibody, rituximab,Genentech brand of rituximab,Hoffmann-La Roche brand of rituximab,IDEC brand of rituximab,IDEC-C2B8,IDEC-C2B8 antibody,Mabthera,Rituxan,Roche brand of rituximab ] mouse/human chimeric mAB; a genetically engineered anti-CD20 antibody for the treatment of B-cell lymphoma; has immunosuppressive activity