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Discrepancies between morphologic, cytochemical, and immunologic characteristics in acute myeloblastic leukemia
American Journal of Clinical Pathology
|July 1, 1987
Summary
Comparing cytochemistry and immunophenotyping in acute myeloblastic leukemia (AML) revealed discrepancies. A combined approach using morphology, cytochemistry, and immunologic markers is best for accurate AML classification.
Area of Science:
- Hematology
- Oncology
- Cell Biology
Background:
- The French-American-British (FAB) classification of acute myeloblastic leukemia (AML) relies on morphology and cytochemistry.
- Immunophenotyping using monoclonal antibodies has become crucial for leukemia diagnosis.
- Discrepancies between these methods can complicate AML classification.
Purpose of the Study:
- To compare cytochemical patterns with immunologic phenotypes in 108 AML cases.
- To investigate discrepancies between morphological, cytochemical, and immunologic classifications.
- To evaluate the utility of a combined approach for AML subtyping.
Main Methods:
- Analysis of 108 AML cases classified by FAB criteria.
- Comparison of cytochemical staining results with immunophenotypic data.
- Detailed examination of cases with discordant findings and unclassifiable cases.
Main Results:
- Observed discrepancies include cases with typical morphology/cytochemistry but lacking lineage-specific antigens.
- Identified cases with immunologic discordance, such as M2 AML positive for monocytic markers (CD14) or M5b AML positive for granulocytic markers (CD15).
- Immunologic markers helped clarify lineage in cases with conflicting morphology and cytochemistry.
Conclusions:
- Cytochemical enzymes may represent earlier myeloid differentiation markers than current monoclonal antibodies.
- A combined morphologic, cytochemical, and immunologic approach provides a more accurate classification of AML.
- This integrated strategy is essential for precise diagnosis and potentially tailored treatment of AML patients.