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CD123-positive plasmacytoid dendritic cells in primary cutaneous marginal zone B-cell lymphoma: diagnostic and
Heinz Kutzner1, Helmut Kerl, Monique C Pfaltz
1Dermatopathologie, Friedrichshafen, Germany.
Insights
Plasma-cytoid dendritic cells (PDC) are significantly present in primary cutaneous marginal zone B-cell lymphoma (PCMZL), suggesting a role in its development and offering a diagnostic marker. This finding helps understand PCMZL
Area of Science:
- Dermatology
- Immunology
- Oncology
Background:
- The origin of primary cutaneous marginal zone B-cell lymphoma (PCMZL) remains unclear.
- Plasma-cytoid dendritic cells (PDC) are vital for initiating immune responses and activating lymphocytes.
- Understanding the cellular components of PCMZL is crucial for diagnosis and understanding its pathogenesis.
Purpose of the Study:
- To investigate the presence and distribution of PDC in various primary cutaneous B-cell lymphomas and pseudolymphomas.
- To determine if PDC clusters can serve as a diagnostic marker for PCMZL.
- To explore the potential role of PDC in the pathogenesis of PCMZL.
Main Methods:
- Immunohistochemistry was used to detect and quantify CD123+ PDC.
- Analysis included cases of PCMZL, cutaneous B-cell pseudolymphomas, primary cutaneous follicle center lymphoma, and primary cutaneous diffuse large B-cell lymphoma, leg type.
- PDC presence was correlated with lymphoma type, cellular proximity, and disease stage.
Main Results:
- Abundant PDC clusters were found in all PCMZL cases (100%) and a majority of pseudolymphomas (64%).
- PDC were largely absent in other B-cell lymphoma subtypes studied.
- PDC clusters were located near malignant plasma cells and T-cells, even in early disease stages.
Conclusions:
- The presence of large PDC clusters is a useful diagnostic aid for PCMZL.
- PDC likely play a significant role in the development of PCMZL.
- PCMZL may be an antigen-driven malignancy involving PDC, T-cells, and B-cells.
Abstract:
The histogenesis of primary cutaneous marginal zone B-cell lymphoma (PCMZL) has not yet been clarified. Plasma-cytoid dendritic cells (PDC) play a crucial role in the initiation of immune responses and activation of T-cells and B-cells. We analyzed the presence of PDC by immunohistochemistry in various forms of primary cutaneous B-cell lymphomas and in B-cell pseudolymphomas. Clusters of CD123+PDC were observed in all PCMZL (23 of 23 cases; 100%) and in two-thirds of cutaneous B-cell pseudolymphomas (14 of 22; 64%), but only in a minority of primary cutaneous follicle center lymphoma (4 of 31; 13%) and not in primary cutaneous diffuse large B-cell lymphoma, leg type. CD123+ PDC clusters were found in close proximity to monoclonal plasma cells and T-cells and were already present at high numbers in early lesions and initial recurrences of PCMZL. In conclusion, the detection of larger clusters of PDC in PCMZL provides a useful adjunctive diagnostic marker and suggests a pathogenetically relevant role of these cells in PCMZL. Furthermore, the occurrence of PDC could explain the high number of T-cells typically found in PCMZL. We propose considering PCMZL as a unique and potentially antigen-driven neoplasm with PDC, T-cells, and B-cells as the constitutive tumor components.
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