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  • Title: IgA anti-red blood cell auto-antibodies in Evans syndrome.
    Author: Moncharmont P, Troncy J, Rigal D.
    Journal: Hematology; 2007 Dec; 12(6):587-9. PubMed ID: 17852438.
    Abstract:
    In Evans syndrome, IgG auto-antibodies (Abs) and/or complement components are frequently detected on red blood cells (RBC) in the direct antiglobulin test (DAT). A 70-year-old man with Evans syndrome diagnosed four years previously presented with a persistent autoimmune haemolytic anaemia, despite immunosuppressive treatment and normalization of platelet count. The RBC allo- and auto-Abs screening and identification were performed by indirect antiglobulin test (IAT) and DAT. In March 2006, no circulating anti-RBC auto-Abs were found in IAT but the DAT was positive with anti-IgG (++), -C3d (weak) and -IgA (++). Follow up for 11 months revealed anti-RBC IgA auto-Abs on five out of six samples. IAT was positive for RBC auto-Abs on three samples. No correlation between the haemoglobin level and the strength of reactivity of IgG and IgA auto-Abs was observed. IgA anti-RBC auto-Abs are present in Evans syndrome. To detect these Abs and characterize their role, DAT procedures should systematically include anti-IgA.
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