CD5+ follicle center lymphoma. Immunophenotyping detects a unique subset of "floral" follicular lymphoma.

Abstract:

:The "floral" variant of follicle center lymphoma (FCL) may be confused with progressive transformation of germinal centers or lymphocyte predominance Hodgkin lymphoma. Immunohistochemistry and gene rearrangement studies are usually sufficient to differentiate among these entities. We present 11 cases of floral FCL that were evaluated at our institution by flow cytometry, immunohistochemistry, or both and by polymerase chain reaction-based molecular analysis. In 4 cases, the neoplastic B cells coexpressed CD5 antigens; 3 of these 4 cases also were CD10+, and all demonstrated rearrangement within the bcl-2 locus. These findings demonstrate that a subset of floral FCL is CD5+. Recognition of this immunophenotype is important to avoid misdiagnosis of nodular variants of small lymphocytic lymphoma and mantle cell lymphoma. Studies suggest that expression of CD5 by neoplastic germinal center cells might result from alterations of the follicular microenvironment and/or inappropriate B-cell responses to cytokine networks.

journal_name

Am J Clin Pathol

authors

Tiesinga JJ,Wu CD,Inghirami G

doi

10.1309/V6PJ-BDAP-F0LU-CB6T

subject

Has Abstract

pub_date

2000-12-01 00:00:00

pages

912-21

issue

6

eissn

0002-9173

issn

1943-7722

journal_volume

114

pub_type

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