• Rossana Villegas Gracia, Catalina Franco Alzate, Javier Rendón Henao, José Domingo Torres Hernández, and Patricia Elena Jaramillo Arbelaez.
• Facultad de Ciencias de la Salud. Universidad de Córdoba. Monteria, Colombia.
• Colomb Medica. 2016 Jun 30; 47 (2): 818681-6.

IntroductionMonoclonal B-cell lymphocytosis is a symptom free condition characterized by the circulation of small clonal population of B lymphocytes in peripheral blood (less than 5x10(9)/L) expressing an immunophenotype similar to chronic lymphocytic leukemia. Different studies based on big hospital series have manifested a higher risk in subjects with monoclonal B-cell lymphocytosis to progress to a chronic lymphocytic leukemia. The behavior of this hematologic entity is unknown therefore its frequency in sporadic chronic lymphocytic leukemia patient relatives was determined.MethodsTransversal descriptive study, 8 color flow cytometry was performed using two of the tubes of the Euro Flow recommended panel, with modifications, for the diagnose of chronic lymphoproliferative disorders of B lymphocytes; besides, a fluorescence in situ hybridization was performed. univariate and bivariate analyses of the information were performed.ResultsMonoclonal B-cell lymphocytosis frequency found in 51 analyzed relatives was 2%, it was a female participant, 59 years old, with a total leukocyte count of 7.7x10(9)/L and a B lymphocyte count of 0.124x10(9)/L; from these, 0.04x10(9)/L were clonal cells with restrictions of the kappa light chain. Rearrangements of the IGH gene (14q32) were found.ConclusionMonoclonal B-cell lymphocytosis was detected in one relative of a patient with sporadic chronic lymphocytic leukemia in a frequency similar to the one reported in general population.

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