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NK cell lymphoma.

Kazuo Oshimi1

  • 1Department of Hematology, Juntendo University School of Medicine, Tokyo, Japan.

International Journal of Hematology
|November 15, 2002
PubMed
Summary
This summary is machine-generated.

Nasal-type NK-cell lymphoma, often linked to Epstein-Barr virus (EBV), presents diagnostic challenges and evolving treatment strategies. Research explores its pathogenesis, treatment, and outcomes, including chemotherapy and stem cell support.

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Area of Science:

  • Hematology
  • Oncology
  • Immunology

Background:

  • Natural killer (NK) cells are lymphocytes with a distinct phenotype (CD3-CD56+) and non-MHC-restricted cytotoxicity.
  • Two NK-cell lymphomas exist: blastic NK-cell lymphoma and nasal-type NK-cell lymphoma.
  • Blastic NK-cell lymphoma is now thought to originate from plasmacytoid dendritic cell precursors.

Purpose of the Study:

  • Focus on nasal-type NK-cell lymphoma, detailing its pathogenesis, diagnostic difficulties, treatment strategies, and patient outcomes.
  • Investigate the role of Epstein-Barr virus (EBV) in the etiology of nasal-type NK-cell lymphoma.
  • Analyze diagnostic challenges, particularly distinguishing NK-cell from T-cell lineage using immunohistochemistry.

Main Methods:

  • Review of pathogenesis, diagnostic criteria, and treatment modalities for nasal-type NK-cell lymphoma.

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  • Analysis of immunohistochemical staining (cytoplasmic CD3, CD56, CD5) for lineage determination.
  • Interim analysis of 166 nasal-type NK-cell lymphoma cases from Japan (1994-1998).

    • Main Results:

    • Nasal-type NK-cell lymphoma predominantly affects the nasal cavity, with EBV implicated in nearly all cases.
    • Diagnostic differentiation from T-cell lymphomas can be challenging due to overlapping marker expression.
    • Radiation therapy shows limited efficacy; combination chemotherapy and stem cell support are under investigation.

    Conclusions:

    • Nasal-type NK-cell lymphoma pathogenesis involves EBV and oncogenic pathways.
    • Accurate diagnosis requires careful interpretation of immunophenotypic markers.
    • Treatment strategies are evolving, with promising results from combination chemotherapy and ongoing research into stem cell support and P-glycoprotein expression.