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Mantle cell lymphoma with plasma cell differentiation.
Ken H Young1, Wing C Chan, Kai Fu
1Department of Pathology and Laboratory Medicine, University of Wisconsin Hospital and Clinics, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA.
The American Journal of Surgical Pathology
|July 25, 2006
Summary
Mantle cell lymphoma (MCL) can exhibit clonal plasma cell (PC) differentiation, even within germinal centers (GCs). This suggests a shared B-cell origin for both MCL and PCs in these specific cases.
Area of Science:
- Hematology
- Oncology
- Immunology
Background:
- Plasma cell (PC) differentiation is crucial for B lymphocyte function.
- Long-lived PCs originate from germinal center (GC) B cells, while short-lived PCs arise from naive B cells.
- Lymphomas from post-GC B cells often show plasmacytic features, unlike naive B-cell lymphomas.
Observation:
- Two cases of mantle cell lymphoma (MCL) presented with typical cytologic and growth pattern features.
- Clonal PCs expressing monotypic kappa light chains were found within tumor nodules and reactive GCs.
- Fluorescence immunophenotyping and Interphase Cytogenetics (FICTION) analysis confirmed the t(11;14) translocation in both MCL and PC populations.
Findings:
- Both MCL cells and clonal PCs shared the characteristic t(11;14)(q13;q32) translocation.
- This indicates that both cell types originated from the same clonal B-cell precursor.
- Clonal plasma cell differentiation can occur within germinal centers in some MCL cases.
Implications:
- This finding expands our understanding of B-cell lymphoma heterogeneity.
- It highlights the potential for divergent differentiation within a single neoplastic clone.
- Further research may elucidate the mechanisms driving this phenomenon in MCL.