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Acute leukemia with myeloid, B-, and natural killer cell differentiation

Po-Shing Lee1, Ching-Nan Lin, Chientzu Liu

  • 1Department of Pathology, Chi Mei Foundation Medical Center, Yungkang City, Tainan. poshing.lee@impath.com

Archives of Pathology & Laboratory Medicine
|February 4, 2003
PubMed

Insights

This study details a rare case of biphenotypic acute leukemia with myeloid and B-cell differentiation. The findings suggest a novel multilineage leukemia possibly arising from a progenitor cell capable of myeloid, B, and natural killer cell development.

Area of Science:

  • Hematology
  • Oncology
  • Immunology

Background:

  • Biphenotypic acute leukemias are rare hematologic malignancies, typically showing myeloid and B-cell or myeloid and T-cell lineage.
  • Acute myeloid-natural killer cell leukemia is a recently recognized subtype.

Observation:

  • A 20-year-old woman presented with CD56(+) acute leukemia exhibiting clear myeloid and B-cell differentiation.
  • Blast cells were positive for myeloperoxidase, CD13, CD33, CD117, TdT, CD19, CD20, CD22, CD34, HLA-DR, and CD56, but negative for CD3, CD5, CD7, and CD10.
  • Rare Auer rods were observed, and PCR confirmed immunoglobulin heavy-chain gene rearrangement without Epstein-Barr virus DNA.

Findings:

  • This case represents the first reported instance of CD56(+) acute leukemia with simultaneous myeloid and B-cell differentiation.
  • The immunophenotype and genetic findings support a distinct subtype of acute leukemia.

Implications:

  • The study proposes this novel entity as the neoplastic counterpart of a progenitor cell with multilineage potential (myeloid, B, and NK cells).
  • This finding expands the understanding of acute leukemia classification and potential cellular origins.
  • Further research is warranted to elucidate the biology and clinical behavior of this rare leukemia subtype.

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