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[Pathogenesis of MALT-type lymphoma].

A Greiner1

  • 1Institut für Pathologie, Universität Würzburg.

Verhandlungen Der Deutschen Gesellschaft Fur Pathologie
|March 22, 2003
PubMed
Summary

Gastric marginal zone B-cell lymphoma (MZBCL) arises from H. pylori-associated gastritis. Genetic changes, including Fas mutations and allelic imbalances, drive its progression and transformation into diffuse large B-cell lymphoma (DLBCL).

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Area of Science:

  • Oncology
  • Immunology
  • Genetics

Context:

  • Gastric marginal zone B-cell lymphoma (MZBCL) originates from Helicobacter pylori-associated gastritis.
  • Early-stage MZBCL proliferation depends on H. pylori-induced T-cell help.
  • Genetic alterations drive the progression towards antigen-independent proliferation.

Purpose:

  • To investigate the genetic alterations and pathways involved in the development and progression of gastric MZBCL.
  • To explore the role of Fas mutations and allelic imbalances in MZBCL pathogenesis.
  • To understand the transformation of MZBCL into diffuse large B-cell lymphoma (DLBCL).

Summary:

  • Fas mutations, leading to loss of function, are frequent in MZBCL and gastric DLBCL, suggesting Fas acts as a tumor suppressor.
  • Two distinct pathways of MZBCL development are identified based on allelic imbalances.
  • The t(11;18) translocation leads to API2 and MALT1 dysregulation, resulting in MZBCL that does not typically transform to DLBCL.

Impact:

  • Identifies key genetic events and pathways in gastric MZBCL pathogenesis.
  • Provides insights into the molecular mechanisms underlying the transformation of MZBCL to DLBCL.
  • Highlights the potential role of Fas as a tumor suppressor in B-cell lymphomas.

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