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Related Experiment Videos

[M3 variant leukemia: clinical and diagnostic features]

M K Lusis1, C Machado, A E Brito

  • 1Departamento de Medicina Clínica, Universidade Federal Fluminense.

Revista Da Associacao Medica Brasileira (1992)
|October 1, 1993
PubMed
Summary

Acute promyelocytic leukemia (APL) is a distinct subtype of acute myeloid leukemia (AML). Misdiagnosis of the hypogranular APL variant is common, highlighting the need for advanced diagnostic tools.

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Area of Science:

  • Hematology
  • Oncology
  • Cell Biology

Background:

  • Acute promyelocytic leukemia (APL) accounts for 5-10% of acute myeloid leukemia (AML) cases.
  • APL is characterized by a specific blast cell morphology (M3), a 15;17 chromosomal translocation, and disseminated intravascular coagulation.
  • Two morphological subsets exist: hypergranular and hypogranular (variant) APL.

Purpose of the Study:

  • To investigate the clinical and laboratory aspects of APL.
  • To assess the diagnostic accuracy of cytomorphology for the hypogranular APL variant.
  • To evaluate the utility of immunophenotyping in diagnosing challenging APL cases.

Main Methods:

  • Retrospective analysis of 19 APL cases out of 217 AML cases.
  • Diagnosis primarily based on cytomorphology.

Related Experiment Videos

  • Immunophenotyping using a panel of monoclonal antibodies (CD2, CD7, CD10, CD19, CD33, CD13, CD14, CD15, anti-MPO).

    • Main Results:

    • A high rate of misdiagnosis was observed for the hypogranular APL variant.
    • 4 out of 8 variant cases were misclassified as acute myelomonocytic leukemia (AML M4).
    • Immunophenotyping proved effective in resolving diagnostic ambiguities.

    Conclusions:

    • Accurate classification of APL is crucial due to its unique therapeutic and prognostic implications.
    • Immunophenotyping serves as a valuable complementary tool for diagnosing difficult APL cases, especially the variant form.
    • APL has shown successful treatment outcomes with cellular differentiating agents.