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  • Title: Clinical and laboratory features of anti-MAG neuropathy without monoclonal gammopathy.
    Author: Pascual-Goñi E, Martín-Aguilar L, Lleixà C, Martínez-Martínez L, Simón-Talero MJ, Díaz-Manera J, Cortés-Vicente E, Rojas-García R, Moga E, Juárez C, Illa I, Querol L.
    Journal: Sci Rep; 2019 Apr 16; 9(1):6155. PubMed ID: 30992531.
    Abstract:
    Antibodies against myelin-associated glycoprotein (MAG) almost invariably appear in the context of an IgM monoclonal gammopathy associated neuropathy. Very few cases of anti-MAG neuropathy lacking IgM-monoclonal gammopathy have been reported. We investigated the presence of anti-MAG antibodies in 69 patients fulfilling diagnostic criteria for CIDP. Anti-MAG antibodies were tested by ELISA and confirmed by immunohistochemistry. We identified four (5.8%) anti-MAG positive patients without detectable IgM-monoclonal gammopathy. In two of them, IgM-monoclonal gammopathy was detected at 3 and 4-year follow-up coinciding with an increase in anti-MAG antibodies titers. In conclusion, anti-MAG antibody testing should be considered in chronic demyelinating neuropathies, even if IgM-monoclonal gammopathy is not detectable.
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