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Related Experiment Videos

[Small cell B-cell lymphomas: guidelines for differential diagnosis].

S E Coupland1, F E Dallenbach, H Stein

  • 1Institut für Pathologie, Universitätsklinikum Benjamin Franklin, Freie Universität Berlin.

Der Pathologe
|June 7, 2000
PubMed
Summary

The World Health Organization (WHO) classification distinguishes small B-cell lymphomas, including chronic lymphocytic leukemia and follicular lymphoma, based on cell differentiation and molecular characteristics. This system refines previous classifications by treating prolymphocytic leukemia as a distinct entity.

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Area of Science:

  • Hematology
  • Oncology
  • Immunology

Context:

  • The classification of small B-cell lymphomas has evolved, with the World Health Organization (WHO) system replacing the R.E.A.L. (Revised European-American Lymphoma) classification.
  • The WHO classification includes chronic lymphocytic leukemia (B-cell type), mantle cell lymphoma, follicular lymphoma, lymphoplasmacytic lymphoma/immunocytoma, hairy cell leukemia, and plasmacytoma.
  • A key difference is the WHO's recognition of prolymphocytic leukemia as a distinct disease entity.

Purpose:

  • To summarize the diagnostic and categorization characteristics of small B-cell lymphomas according to the latest WHO classification.
  • To provide insights into the molecular biological and clinical features of these lymphomas.
  • To highlight the differences between the WHO and R.E.A.L. classifications.

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Summary:

  • Small B-cell lymphomas originate from B cells at various differentiation stages, exhibiting features of their normal counterparts.
  • Diagnosis typically involves assessing tumor cell growth patterns, cytology, immunophenotype, growth fraction, and reactive cell infiltrates.
  • Molecular characteristics, particularly chromosomal translocations in follicular and mantle cell lymphomas, are crucial for understanding their pathogenesis.

Impact:

  • The WHO classification discards the "umbrella grading" of lymphomas, emphasizing grading within specific disease entities due to heterogeneous progression.
  • Mantle cell lymphomas, unlike other small B-cell lymphomas, may not have an indolent progression and are not considered "low-grade" tumors.
  • Understanding these classifications aids in accurate diagnosis, prognosis, and treatment strategies for small B-cell lymphomas.