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Routine immunophenotyping in acute leukemia: Role in lineage assignment and reassignment
Misbah Qadir1, Maurice Barcos, Carleton C Stewart
1Leukemia Section, Department of Medicine, Roswell Park Cancer Institute, Buffalo, New York 14263, USA.
Cytometry. Part B, Clinical Cytometry
|June 2, 2006
Summary
Immunophenotyping by multiparameter flow cytometry is crucial for diagnosing acute leukemia. This method clarified lineage in cases where morphology and cytochemistry were inconclusive, improving diagnostic accuracy.
Area of Science:
- Hematology
- Oncology
- Immunology
Background:
- Acute leukemia diagnosis traditionally relies on morphology and cytochemistry.
- Limitations exist in these methods for definitively establishing cell lineage.
- Multiparameter flow cytometry immunophenotyping offers a more detailed cellular analysis.
Purpose of the Study:
- To evaluate the utility of immunophenotyping in diagnosing acute leukemia.
- To assess its role in cases with ambiguous lineage determination by conventional methods.
- To support or refute the routine inclusion of immunophenotyping in diagnostic workflows.
Main Methods:
- Retrospective analysis of 646 acute leukemia cases.
- Comparison of lineage assignment by morphology/cytochemistry versus immunophenotyping.
- Utilized multiparameter flow cytometry for immunophenotyping.
Main Results:
- Morphology and cytochemistry were insufficient for lineage determination in 34 cases (5%).
- Immunophenotyping resolved lineage in these 34 cases, identifying myeloid, undifferentiated, and lymphoid subtypes.
- Immunophenotyping altered the initial lineage assignment in 11 cases (2%), including 8 lymphoid-to-myeloid and 3 myeloid-to-lymphoid shifts.
Conclusions:
- Immunophenotyping is essential for accurate acute leukemia diagnosis.
- It resolves lineage ambiguities and corrects misclassifications from morphology/cytochemistry alone.
- Routine inclusion of limited immunophenotyping is recommended for acute leukemia evaluation.