Rituximab can be combined with daily plasma exchange to achieve effective B-cell depletion and clinical improvement in acute autoimmune TTP.
Much of idiopathic thrombotic thrombocytopenic purpura (TTP) is attributed to the presence of an autoantibody to ADAMTS13, the metalloprotease that degrades ultralarge von Willebrand protein multimers. Most patients respond to treatment with therapeutic plasma exchange (TPE), which replaces the missing protease and removes the circulating inhibitor. However, a substantial fraction of idiopathic TTP cases (10%-20%) might not respond to TPE alone, and, therefore, interest has been gathering around the use of the novel immunosuppressive anti-B-cell antibody, rituximab. We report 2 cases of refractory TTP in which the combined use of plasma exchange and rituximab was associated with clinical resolution of active TTP, and we discuss the benefits and possible timing of combined therapy.
Darabi
Kamran
K
Joint Program in Transfusion Medicine of Harvard Medical School at Massachusetts General Hospital, Boston 02114, USA. kamrandarubi@yahoo.com
Berg
Anders H
AH
D051722:ADAM Proteins / Q000276:immunology; D000328:Adult; D000911:Antibodies, Monoclonal / Q000627:therapeutic use*; D058846:Antibodies, Monoclonal, Murine-Derived; D000970:Antineoplastic Agents / Q000627:therapeutic use*; D001323:Autoantibodies / Q000187:drug effects / Q000276:immunology; D001402:B-Lymphocytes / Q000187:drug effects / Q000276:immunology; D003131:Combined Modality Therapy; D005260:Female; D005434:Flow Cytometry; D006801:Humans; D008212:Lymphocyte Depletion; D008875:Middle Aged; D010951:Plasma Exchange; D011697:Purpura, Thrombotic Thrombocytopenic / Q000503:physiopathology / Q000628:therapy*; D000069283:Rituximab
D000911:Antibodies, Monoclonal; D058846:Antibodies, Monoclonal, Murine-Derived; D000970:Antineoplastic Agents; D001323:Autoantibodies; D000069283:Rituximab; D051722:ADAM Proteins