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Immunophenotyping large B-cell lymphomas. Flow cytometric pitfalls and pathologic correlation.

H C Bertram1, I J Check, M A Milano

  • 1Department of Pathology, Evanston Northwestern Healthcare, Northwestern University Medical School, Evanston, IL, USA.

American Journal of Clinical Pathology
|August 8, 2001
PubMed
Summary
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Diagnosing large cell lymphomas using flow cytometry (FC) can be challenging. This study found that morphologic features do not predict diagnostic difficulty, emphasizing critical gating strategies for improved FC yield in lymphoma diagnosis.

Area of Science:

  • Hematology
  • Oncology
  • Immunology

Background:

  • Large cell lymphomas present diagnostic challenges for flow cytometry (FC).
  • Accurate FC protocols are crucial for effective lymphoma diagnosis and classification.
  • Correlating FC data with histological features aids in understanding diagnostic complexities.

Purpose of the Study:

  • To refine diagnostic protocols for large cell lymphomas using FC.
  • To establish correlations between FC findings and demographic/histologic features.
  • To enhance the diagnostic accuracy of FC in identifying large cell lymphomas.

Main Methods:

  • Reviewed 63 cases of large B-cell lymphoma diagnosed between 1995 and 1999.
  • Analyzed diagnostic slides, FC light scatter, and staining patterns.

Related Experiment Videos

  • Categorized lymphomas into "clear cut" and "complex" light scatter patterns.

    • Main Results:

    • 51 lymphomas had adequate material for review, with 33% in the "clear cut" pattern and 67% in the "complex" pattern.
    • "Clear cut" cases showed higher mitotic activity and cellularity.
    • Histological features like apoptosis, necrosis, and sclerosis were common, irrespective of FC patterns.

    Conclusions:

    • Morphologic features of large cell lymphomas do not reliably predict diagnostic challenges in FC.
    • Effective gating strategies are essential for improving diagnostic yield in FC analysis of lymphomas.
    • FC remains a valuable tool, but careful protocol optimization is necessary for complex cases.