title: B-cell depletion in immune thrombocytopenia.
abstract: B cells play an important role in the immune response and can lead to the development of autoimmune diseases and particularly immune thrombocytopenia (ITP). A rational approach to ITP treatment could involve B-cell depletion such as with rituximab. Rituximab is a chimeric monoclonal antibody directed against CD20 molecule. It has direct effects on antibody production and indirect effects on cellular immunity. Rituximab demonstrated an overall response rate of 62.5% that lasted from 2-48 months. The ability of rituximab as an effective splenectomy-avoiding option was recently confirmed in a meta-analysis of randomized clinical trials and observational studies including 368 patients with an overall response rate of 57%. However, the estimated 5- year response is only 21% in adults. Rituximab appears to be well tolerated, but we lack studies of long-term tolerance. The optimal time to administer rituximab for ITP remains unclear. There is consensus to administer corticosteroids or intravenous immunoglobulin (IVIg) as first-line therapy in ITP. A panel of experts was unable to formulate a clear strategy for the respective place of splenectomy, thrombopoietin-receptor agonists, and rituximab as second-line treatment. Among new-generation CD20-targeted therapy, only veltuzumab has been tested for ITP. Preliminary study suggests that it could have similar efficacy to rituximab. Options other than anti-CD20 treatment may modulate and/or inhibit the B-cell compartment. Several monoclonal antibodies (MoAbs) directed against different B-lymphocyte receptors or structures implicated in the cooperation between B and T lymphocytes have been successfully tested in various autoimmune diseases. Testing these options in ITP will be an exciting challenge.
authors.affiliation: Centre de référence des cytopénies autoimmunes de l'adulte, CHU Henri Mondor, Assistance Publique-Hôpitaux de Paris, Créteil, France. bertrand.godeau@hmn.aphp.fr
authors.forename: Bertrand
authors.initials: B
authors.lastname: Godeau
mesh_terms: D018951:Antigens, CD20 / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology*; D006801:Humans; D013921:Thrombocytopenia / Q000276:immunology*
chemical_list: D018951:Antigens, CD20