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Am J Clin Pathol. 2009 Nov;132(5):733-7. doi: 10.1309/AJCPU5E3NXEKLFIY.

Significant CD5 expression on normal stage 3 hematogones and mature B Lymphocytes in bone marrow.

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  • 1Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX 75390-9072, USA.


B-cell maturation from hematogones to mature B cells in bone marrow exhibits a consistent, complex spectrum of sequential antigen expression. CD5 expression, however, has not been characterized. We studied the dynamics of CD5 expression on developing B cells by 4-color flow cytometry in 32 patients, aged 9 months to 63 years, with hematogone hyperplasia (>3.5% of total events). The mean percentage of hematogones was 8.1%. We demonstrate consistent CD5 expression on normal, polytypic B cells in a continuum, predominantly at later stages of maturation, specifically on stage 3 hematogones and mature B cells. Awareness of this normal pattern of CD5 expression on B-cell subsets has implications in the analysis of minimal residual disease of CD5+ B-lineage non-Hodgkin lymphomas.

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