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Primary cutaneous B-cell lymphoma: a unique type of low-grade lymphoma. Clinicopathologic and immunologic study of 83
M Santucci1, N Pimpinelli, L Arganini
1Istituto di Anatomia e Istologia Patologica, Università degli Studi di Firenze, Italia.
Insights
Primary cutaneous B-cell lymphoma (CBCL) primarily affects the elderly and often remains localized. Despite morphologic variations, CBCL exhibits a low-grade malignancy with a favorable long-term prognosis.
Area of Science:
- Dermatology
- Hematology
- Oncology
Background:
- Primary cutaneous B-cell lymphoma (CBCL) is a distinct entity requiring precise characterization.
- Understanding its clinical and morphoimmunologic features is crucial for accurate diagnosis and management.
Purpose of the Study:
- To investigate the clinical presentation, course, and morphoimmunologic characteristics of primary cutaneous B-cell lymphoma (CBCL).
- To establish the nature of CBCL and its prognostic implications.
Main Methods:
- Retrospective analysis of 83 patients with primary cutaneous B-cell lymphoma (CBCL).
- Evaluation of clinical data, disease presentation, and morphoimmunologic features, including antigenic phenotype of tumor cells.
Main Results:
- CBCL predominantly affects elderly males (median age 58 years) with frequent locoregional extension (86.7%).
- Neoplastic cells display features suggesting a mantle-zone origin, with a specific antigenic phenotype (CD19+, CD20+, CD22+, CD28+, CD10-, CD5-, MB2+, CD74+/-, CDw75+/-, MT2+/-, surface immunoglobulin + monoclonal/-).
- CBCL demonstrates nonaggressive clinical behavior, good response to treatment, and a benign long-term prognosis despite increasing atypism with age.
Conclusions:
- Primary cutaneous B-cell lymphoma (CBCL) is a unique, low-grade malignancy with a favorable prognosis.
- Accurate recognition of CBCL is essential to prevent inappropriate treatment strategies.
Abstract:
The clinical presentation and course, and the morphoimmunologic features of primary cutaneous B-cell lymphoma (CBCL) were investigated in a series of 83 patients. Fifty-one patients were male and 32 were female (male-to-female ratio of 1.6:1); CBCL primarily involved the elderly (median age, 58 years). A locoregional extension of the disease was quite frequent (86.7%). The neoplastic cells showed a range of appearances reminiscent of the whole spectrum of follicular/parafollicular cells. The antigenic phenotype of tumor cells (CD19+, CD20+, CD22+, CD28+, CD10-, CD5-, MB2+, CD74+/-, CDw75+/-, MT2+/-, surface immunoglobulin + monoclonal/-) plus the presence of admixed CD14- dendritic reticulum cells suggest a mantle-zone nature for CBCL. The nonaggressive clinical behavior with a substantial tendency to remain localized to a limited area of the skin, the quite good response to nonaggressive treatment, and the dichotomy existing between the enhancement of morphoimmunologic atypism--which parallels the increasing age and growth rate of lesions--and the constant benign overall prognosis on long-term follow-up make CBCL a unique type of lymphoma of low-grade malignancy. Proper recognition of CBCL is mandatory to avoid possible undertreatment or overtreatment of the patients affected.
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