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Evolution of complex chromosomal rearrangements in a case of biphenotypic pre-B/myeloid acute leukemia

M Wood1, J H Palmer, F Wright

  • 1Department of Haematology, Royal Free Hospital and School of Medicine, London, U.K.

Cancer Genetics and Cytogenetics
|September 1, 1993
PubMed

Insights

This case study presents a rare instance of acute biphenotypic leukemia in a young female. The patient

Area of Science:

  • Hematology
  • Oncology
  • Genetics

Background:

  • Acute biphenotypic leukemia (ABL) is a rare hematologic malignancy characterized by the coexpression of lymphoid and myeloid lineage antigens on blast cells.
  • The genetic landscape of ABL is complex and often includes specific chromosomal abnormalities, though some cases present with unique or atypical findings.

Purpose of the Study:

  • To report a unique case of acute biphenotypic leukemia with a complex karyotype.
  • To describe the specific chromosomal abnormalities identified in this case, highlighting novel findings.

Main Methods:

  • Case report analysis.
  • Karyotyping to identify clonal chromosomal abnormalities.
  • Immunophenotyping to confirm coexpression of lymphoid and myeloid antigens.

Main Results:

  • A 24-year-old female presented with acute biphenotypic leukemia.
  • The patient's clonal karyotype was complex and did not harbor previously recognized abnormalities associated with ABL.
  • Identified chromosomal abnormalities included breakpoints common to acute lymphoblastic leukemia and acute myeloid leukemia, alongside rare heritable fragile sites (10q24) and common aphidicolin-induced sites (chromosome 7).

Conclusions:

  • This case highlights the genetic heterogeneity of acute biphenotypic leukemia.
  • The presence of both lymphoid and myeloid leukemia-associated breakpoints, along with specific fragile sites, in a complex karyotype underscores the need for comprehensive genetic analysis in ABL.
  • Further research is warranted to understand the implications of these unique chromosomal abnormalities on disease pathogenesis and treatment outcomes.

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