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Biphenotypic acute leukemia with t(15;17)
M P Scolnik1, P Negri Aranguren, M T Cuello
1IIHEMA, Academia Nacional de Medicina de Buenos Aires.
Leukemia & Lymphoma
|July 16, 2005
Summary
This study reports a rare case of biphenotypic acute leukemia (BAL) with an unusual t(15;17) genetic abnormality. Comprehensive diagnostic methods confirmed the co-expression of myeloid and B-lymphoid markers in this challenging leukemia.
Area of Science:
- Hematology
- Oncology
- Cytogenetics
Background:
- Biphenotypic acute leukemia (BAL) is a rare subtype of acute leukemia, accounting for approximately 5% of all cases.
- Commonly associated cytogenetic abnormalities include the Philadelphia chromosome and 11q23 rearrangements.
- Accurate diagnosis is crucial for effective treatment strategies.
Observation:
- A case of BAL presented with blasts exhibiting lymphoblast morphology and focal myeloperoxidase positivity.
- Immunophenotyping confirmed the co-occurrence of myeloid and B-lymphoid lineage markers.
- Cytogenetic analysis revealed the uncommon t(15;17) translocation and trisomy 8.
Findings:
- Fluorescent in situ hybridization (FISH) detected the PML/RARa rearrangement.
- Reverse transcription-polymerase chain reaction (RT-PCR) confirmed the PML/RARa fusion transcript in bone marrow and peripheral blood.
- These findings indicate a BAL case with an infrequent genetic abnormality.
Implications:
- This case underscores the importance of integrating multiple diagnostic techniques, including morphology, immunophenotyping, cytogenetics, and molecular studies, for accurate BAL diagnosis.
- Correlating diverse diagnostic results is essential for guiding appropriate treatment decisions in BAL patients.
- Understanding rare genetic abnormalities in BAL can improve patient outcomes and inform future research.