Polyclonal B-cell lymphocytosis: Report of three cases

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Abstract

Background: Persistent polyclonal B-cell lymphocytosis (PPBL) is a rare benign condition characterized by a polyclonal B-cell lymphocytosis with binucleated lymphocytes. We hereby report three cases of PPBL. Methods: Flow cytometry immunophenotyping was performed in peripheral blood samples from three patients with clinical suspicion of lymphoproliferative disease. Results: Case 1 was a female middle-aged smoker; Case 2 was an elderly male; and Case 3 was a non-smoker female. Flow cytometry evaluation of all cases revealed an expansion of mature B-cells, with a normal Kappa/Lambda light chain ratio; B-cell lymphocytes of Cases 2 and 3 had CD5 coexpression; Case 3 also had monocytosis. Conclusions: Diagnose of PPBL is important in order to avoid unnecessary diagnostic procedures and therapy. © 2018 International Clinical Cytometry Society.

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Marcondes, N. A., Schneider, L., Spindler, B. M., Fernandes, F. B., & Faulhaber, G. A. M. (2018). Polyclonal B-cell lymphocytosis: Report of three cases. Cytometry Part B - Clinical Cytometry, 94(6), 953–955. https://doi.org/10.1002/cyto.b.21638

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