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Childhood erythroleukemia. Studies on pathogenesis using colony assays
The American Journal of Pediatric Hematology/Oncology
|January 1, 1986
Summary
Erythroleukemia (EL) in infants may actually be acute myeloblastic leukemia. Cell culture assays revealed normal hematopoietic stem cells but abnormal myeloblasts, suggesting a misnomer for EL.
Area of Science:
- Hematology
- Oncology
- Cell Biology
Background:
- Erythroleukemia (EL) diagnosis can be challenging in infants.
- Understanding the underlying hematopoietic stem cell behavior is crucial for accurate diagnosis and treatment.
Observation:
- Two infants diagnosed with EL showed normal growth of myeloid (CFU-C), erythroid (BFU-E), and mixed (CFU-GEMM) progenitor cells in culture.
- Blast cells, though scarce morphologically, were identified via colony assays, exhibiting myeloblastic features, peroxidase positivity, and My-1 antigen expression.
- Monosomy 7, a chromosomal abnormality, was detected in blast cells but not lymphocytes, indicating clonal proliferation.
Findings:
- The study identified preserved normal hematopoietic progenitor pools in infants with EL.
- Abnormal myeloblastic proliferation was evident in blast colony assays, aiding diagnosis when bone marrow morphology was inconclusive.
- Chemotherapy led to remission, with subsequent disappearance of blast colonies and monosomy 7.
Implications:
- Findings suggest EL in these cases may be a misnomer, potentially representing acute myeloblastic leukemia with secondary hyperplasia.
- Blast colony assays are valuable diagnostic tools for identifying aberrant myeloblastic proliferation in ambiguous cases.
- Preservation of normal hematopoietic progenitors implies potential for targeted therapies in such conditions.