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Occurrence of Non-Hodgkin Lymphoma after the Diagnosis of Persistent Polyclonal B-cell Lymphocytosis

Jean-Baptiste Méar, Xavier Troussard, Véronique Salaün, Hossein Mossafa, Gandhi Damaj, Cécile Le Naourès, Françoise Galateau-Sallé and Edouard Cornet

Persistent polyclonal B cell lymphocytosis (PPBL) is a rare indolent condition characterized by a polyclonal expansion of B cells associated with binucleated lymphocytes observable on blood smears. Though polyclonal, recurrent genetic abnormalities have been described in PPBL, supernumerary isochromosome 3q (+i(3)(q10)) being the most frequently described. We report here two clinical observations showing the occurrence of NHL after the diagnosis of PPBL. These observations lead us to recommend a closer follow-up of PPBL patients and raise the question of a relationship between PPBL and NHL.