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Related Experiment Videos

Multiple lineage reactivity in childhood leukemia.

L Penchansky1, S S Kaplan, J R Krause

  • 1Department of Pathology, University of Pittsburgh, Pennsylvania 15213.

Pediatric Pathology
|January 1, 1990
PubMed
Summary

Flow cytometry identified distinct surface markers in childhood acute leukemias. Mixed interlineage leukemias, particularly in acute myeloid leukemia (AML), support the theory of lineage promiscuity in hematopoiesis.

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Area of Science:

  • Hematology
  • Immunophenotyping
  • Pediatric Oncology

Background:

  • Acute leukemia classification relies on morphology and immunophenotyping.
  • Understanding lineage-specific antigens is crucial for accurate diagnosis and prognosis.
  • The concept of lineage promiscuity suggests co-expression of antigens during normal hematopoietic development.

Purpose of the Study:

  • To evaluate surface markers on leukemia cells from children with acute leukemia using flow cytometry.
  • To correlate immunophenotypic findings with FAB classification in acute lymphocytic leukemia (ALL) and acute myeloid leukemia (AML).
  • To investigate the incidence and characteristics of mixed interlineage leukemias.

Main Methods:

  • Flow cytometry analysis of 63 children's leukemia cells.
  • Utilized a panel of monoclonal antibodies targeting lymphoid and myeloid lineage-specific antigens.
  • Classified mixed leukemias as intralineage (B+T+) or interlineage (B+ or T+/M+).

Main Results:

  • Surface markers in ALL generally did not correlate with FAB classification, except for L3 leukemia.
  • Myeloid leukemias (M1-M4) showed positivity for CD13 and CD33.
  • CD14 and MY8 were exclusively detected in FAB class M4 leukemia.
  • Interlineage leukemias constituted 5.6% of ALLs and 7.9% of all leukemias.
  • Mixed interlineage leukemias were found in 3.7% of ALLs and 33% of AMLs.
  • All patients with interlineage leukemias survived treatment with the dominant leukemia protocol, though follow-up is limited.

Conclusions:

  • Immunophenotyping reveals specific antigen expression patterns in childhood acute leukemias.
  • The high prevalence of mixed interlineage leukemias in AML supports the theory of lineage promiscuity.
  • Further follow-up is needed to determine the long-term outcomes for patients with mixed interlineage leukemias.

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