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[Lymphoplasmacytic lymphoma with a breast tumor and IgG+IgA type biclonal gammopathy].

An 88-year-old female was admitted to our hospital due to a right breast tumor and biclonal gammopathy (IgG-lambda and IgA-lambda). CT scan showed systemic lymphadenopathy. Tumor specimens were comprised of medium-sized atypical lymphocytes. Lymphoepithelial lesions and plasmacytic differentiation were observed. The atypical lymphocytes were positive for CD20, CD79a, Bcl-2, CD5 and negative for CD10, Cyclin D1. Moreover, the cells expressed IgG-lambda or IgA-lambda. We diagnosed the patient's disease as lymphoplasmacytic lymphoma (LPL). Although biclonal gammopathy with IgM elevation has been reported in LPL patients, this is the first case of IgG+IgA type biclonal gammopathy.

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