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Background Chronic B lymphoproliferative diseases (BLPD),which are mainly compo sed of chronic lymphocytic leukemia (CLL),hairy cell leukemia (HCL),follicular lymphom a (FL),marginal zone lymphoma (MZL,including mainly SMZL and NMZL),lymphoplas macytoid lymphoma(LPL) and BLPD-undefined(BLPD-U),are characterized by abnormally proliferation of monoclonal mature B lymphocytes.