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[Childhood acute lymphoblastic leukemia with t(1;19) lacking E2A-pBX1 chimeric transcripts].

Kousaku Matsubara1, Takuya Hirata

  • 1Department of Pediatrics, Nishi-Kobe Medical Center.

[Rinsho Ketsueki] the Japanese Journal of Clinical Hematology
|May 20, 2006
PubMed
Summary

This study reports a pediatric case of acute lymphoblastic leukemia (ALL) with a specific chromosomal translocation but without the expected E2A-PBX1 fusion gene. The patient achieved complete remission with chemotherapy, highlighting the need for further research into this ALL subtype.

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Area of Science:

  • Pediatric Hematology Oncology
  • Molecular Genetics
  • Cancer Biology

Background:

  • Acute lymphoblastic leukemia (ALL) is a heterogeneous disease with various genetic subtypes influencing prognosis.
  • The chromosomal translocation t(1;19) is typically associated with E2A-PBX1 chimeric transcripts, a known risk factor in pediatric ALL.
  • Understanding genetic variations in ALL is crucial for tailoring treatment strategies.

Observation:

  • A pediatric patient with ALL presented with splenomegaly, high white blood cell count, and a high percentage of lymphoblasts.
  • G-banding revealed the der(19)t(1;19)(q23;p13) chromosomal abnormality, but E2A-PBX1 transcripts and E2A gene rearrangement were absent.
  • Immunophenotyping indicated an early pre-B lineage.

Findings:

  • Despite the absence of E2A-PBX1 fusion transcripts, the patient achieved complete remission with standard chemotherapy, indicating a favorable response.

Related Experiment Videos

  • A review of similar cases (17 children) showed common features of early pre-B immunophenotype and hyperdiploidy, but also significant heterogeneity.
  • This case represents a variant of t(1;19)-positive ALL lacking the typical molecular signature.

    • Implications:

    • This case and literature review underscore the biological and clinical heterogeneity within t(1;19)-positive pediatric ALL.
    • Further accumulation of data on such cases is necessary to define optimal treatment protocols and prognostic factors.
    • Identifying distinct molecular subtypes within seemingly similar genetic abnormalities is vital for advancing precision oncology in childhood leukemia.