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Related Experiment Videos

Primary cutaneous marginal zone B-cell lymphoma.

Jeong Hee Cho-Vega1, Francisco Vega, Georgios Rassidakis

  • 1Department of Pathology, The Methodist Hospital, Houston, TX, USA.

American Journal of Clinical Pathology
|July 13, 2006
PubMed
Summary

Primary cutaneous marginal zone B-cell lymphoma (PCMZL) is an indolent B-cell lymphoma with an excellent prognosis. Genetic analysis reveals specific chromosomal translocations in a subset of PCMZL cases, potentially activating key cellular pathways.

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Area of Science:

  • Dermatology
  • Hematology
  • Oncology

Background:

  • Primary cutaneous marginal zone B-cell lymphoma (PCMZL) is a distinct subtype of primary cutaneous B-cell lymphoma.
  • PCMZL is characterized as an indolent neoplasm with a favorable clinical prognosis.
  • Histologically, PCMZL presents as a polymorphous infiltrate with specific B-cell markers and associated reactive T cells and lymphoid follicles.

Purpose of the Study:

  • To provide a comprehensive overview of Primary Cutaneous Marginal Zone B-cell Lymphoma (PCMZL).
  • To discuss the clinical characteristics, histological features, and molecular aspects of PCMZL.
  • To highlight suspected etiologic agents and recurrent genetic abnormalities in PCMZL.

Main Methods:

  • Review of existing literature and classifications, including the World Health Organization-European Organization for Research and Treatment of Cancer.

Related Experiment Videos

  • Analysis of diagnostic markers, including B-cell markers, CD5, CD10, bcl-2, and bcl-6.
  • Investigation of molecular techniques for clonality assessment (e.g., polymerase chain reaction) and identification of chromosomal translocations.

    • Main Results:

    • PCMZL exhibits an indolent clinical course with an excellent prognosis.
    • Neoplastic cells express B-cell markers, typically bcl-2, and lack CD5, CD10, and bcl-6.
    • Borrelia burgdorferi is a suspected, though not universal, etiologic agent. Monoclonal IgH rearrangement is detected in ~75% of cases, with potential false negatives due to somatic mutation.
    • Recurrent chromosomal translocations, including t(14;18) and t(11;18), are found in 10-20% of PCMZLs, often activating the NF-kappaB pathway.

    Conclusions:

    • PCMZL is a well-defined entity within cutaneous B-cell lymphomas, recognized by its indolent nature and distinct cellular composition.
    • While diagnostic markers are established, molecular investigations reveal complexities in clonality assessment and identify specific genetic alterations.
    • The identification of chromosomal translocations like t(14;18) and t(11;18) provides insights into the pathogenesis of PCMZL and potential therapeutic targets.