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Trilineage phenotypic compromise in acute leukemia
M P Scolnik1, M F Palacios, F R Ramirez
1IIHEMA, Academia Nacional De Medicina De Buenos Aires, Argentina. postmaster@anmra.sld.ar
Leukemia & Lymphoma
|August 10, 1999
Summary
This case report details a rare triphenotypic acute leukemia involving myeloid, B, and T cell lineages. Accurate diagnosis requires integrating multiple methods for this mixed lineage leukemia.
Area of Science:
- Hematology
- Oncology
- Immunophenotyping
Background:
- Acute myeloid leukemia (AML) subtypes are classified based on lineage involvement.
- Triphenotypic acute leukemia, involving myeloid, B, and T lineages, is exceptionally rare.
Observation:
- A case presented with leukemic blasts showing promyelocytic morphology and positive myeloid markers (myeloperoxidase, PAS, Sudan Black).
- Immunophenotyping revealed co-expression of myeloid, B-cell, and T-cell lineage markers.
- Cytogenetic analysis identified trisomy 8 and trisomy 11.
Findings:
- The patient was diagnosed with triphenotypic acute leukemia, not M3-variant AML, due to trilineage involvement.
- Morphological and initial cytochemical findings suggested M3-AML, but immunophenotype and cytogenetics contradicted this.
Implications:
- Correlating multiple diagnostic methods (morphology, cytochemistry, immunophenotyping, cytogenetics) is crucial for diagnosing mixed lineage leukemias.
- Understanding this rare leukemia subtype is important for evaluating its prognostic significance and guiding treatment strategies.