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Related Experiment Videos

Acute myeloid leukemia, FAB M-1 microgranular variant: a multiparameter study.

D Nguyen1, R K Brynes, L Macaulay

  • 1Department of Pathology Clinical Hematology, Los Angeles County - USC Medical Center.

Hematologic Pathology
|January 1, 1989
PubMed
Summary

Ultracytochemistry aids in diagnosing difficult acute myeloid leukemia (AML) cases. This method helps classify microgranular AML FAB M-1 when other tests are inconclusive.

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Area of Science:

  • Hematology
  • Oncology
  • Clinical Pathology

Background:

  • Acute leukemia diagnosis relies on morphology, cytochemistry, immunophenotyping, and cytogenetics.
  • Some de novo acute leukemia cases remain unclassifiable with standard methods.
  • Accurate subclassification is crucial for appropriate treatment and prognosis.

Purpose of the Study:

  • To investigate the utility of myeloperoxidase ultracytochemistry in classifying unclassifiable acute myeloid leukemia (AML) cases.
  • To determine if ultracytochemistry can aid in differentiating between AML FAB M-1 and other subtypes.
  • To propose a new designation for these challenging cases.

Main Methods:

  • Analysis of 62 de novo acute leukemia cases using light microscopy, cytochemistry, flow cytometry, and cytogenetics.

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  • Detailed examination of 5 unclassifiable cases with myeloperoxidase ultracytochemistry.
  • Evaluation of blast cell characteristics including morphology, cytochemical stains, surface markers, and TdT.

    • Main Results:

    • 25 cases classified as AML, 32 as ALL, and 5 as unclassifiable.
    • Unclassified cases were cytochemically negative, lacked B/T-cell markers and TdT positivity.
    • Myeloperoxidase ultracytochemistry revealed positive reactions in 10-20% of blasts in the 5 unclassifiable cases, suggesting AML FAB M-1.

    Conclusions:

    • Myeloperoxidase ultracytochemistry is valuable for diagnosing and subclassifying AML FAB M-1, especially when standard techniques are non-contributory.
    • The study proposes designating these cases as AML FAB M-1 'microgranular' type.
    • Ultracytochemistry offers definitive diagnostic insights for challenging acute leukemia presentations.