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Hospital population screening reveals overrepresentation of CD5 monoclonal B-cell lymphocytosis and monoclonal gammopathy of undetermined significance of IgM type

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Abstract

Monoclonal B-cell lymphocytosis (MBL) and monoclonal gammopathy of undetermined significance (MGUS) result from clonal expansions of mature B or plasma cells. Here, we set out to determine the immunophenotypic/monoclonal immunoglobulin (M protein) features and co-prevalence of MBL and MGUS in a hospital-based cohort of 1909 non-hematooncological patients. Of the evaluable cases, 3.8 % showed evidence for MBL by immunophenotyping, while 9.8 % were screened positive for M protein by immunofixation. With six concomitant cases (0.4 %), MBL and MGUS were not statistically associated. At least in two of these coincident cases, MBL and MGUS were of different clonal origin since both clones had divergent light chain restriction. CD5 MBL (57.1 %) and IgM+ MGUS (24.7 %) were strikingly overrepresented compared to population-based screenings and did not progress to overt lymphoma or myeloma during the observation period (mean follow-up of 117 weeks or 110 weeks, respectively). Prevalence and phenotypes suggest that a substantial proportion of incidental MBL and MGUS in hospitalized patients may be attributed to transiently expanded B-cell clones in the context of disease-related immune stimulation rather than reflecting veritable precursors of clonal B-cell malignancies.

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All authors gave final approval for the manuscript to be published.

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The authors declare that they have no conflict of interest.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

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Informed consent was obtained from all individual participants included in the study.

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Correspondence to Mascha Binder.

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Voigtlaender, M., Vogler, B., Trepel, M. et al. Hospital population screening reveals overrepresentation of CD5 monoclonal B-cell lymphocytosis and monoclonal gammopathy of undetermined significance of IgM type. Ann Hematol 94, 1559–1565 (2015). https://doi.org/10.1007/s00277-015-2409-9

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  • DOI: https://doi.org/10.1007/s00277-015-2409-9

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