Abstract:Background: Monoclonal B-cell lymphocytosis (MBL) is characterized by the presence of a circulating population of clonal B-cells where the total B-cell count is <5 × 109/L and criteria for the diagnosis of other lymphoproliferative disorders are not present. In most patients the immunophenotype is similar to that of chronic lymphocytic leukemia with co-expression of CD19 and CD5. The natural history of MBL is unclear. We used the Mayo Clinic hematopathology database to identify patients with MBL and abstrac… Show more
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