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[Bcr-abl translocation: diagnostic methods and clinical value]

J M Pignon1

  • 1Service d'hématologie biologique, Hôpital Henri-Mondor, Créteil.

Annales De Biologie Clinique
|October 1, 1998
PubMed
Summary

The Philadelphia chromosome (t(9;22)) is key in chronic myelogenous leukemia and some acute leukemias. Detecting this genetic marker aids in monitoring treatment effectiveness and managing leukemia.

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Area of Science:

  • Hematology
  • Genetics
  • Oncology

Context:

  • The t(9;22) translocation, also known as the Philadelphia chromosome, is a hallmark genetic abnormality.
  • It is found in approximately 95% of chronic myelogenous leukemia (CML) cases.
  • This translocation also occurs in a subset of acute leukemias, predominantly lymphoid types.

Purpose:

  • To discuss the significance of the t(9;22) translocation in leukemia.
  • To highlight the molecular consequences of this chromosomal rearrangement.
  • To emphasize the diagnostic and prognostic importance of detecting this translocation.

Summary:

  • The t(9;22) translocation results in the fusion of the bcr and c-abl genes, producing specific leukemia-associated bcr-abl messenger RNAs.
  • Accurate identification of the t(9;22) translocation is achieved through cytogenetic methods (conventional and fluorescence in situ hybridization - FISH) and molecular techniques.
  • Detecting minimal residual Philadelphia chromosome-positive cells after treatments like bone marrow transplantation or interferon therapy is crucial for assessing treatment response and guiding further therapeutic decisions.

Impact:

  • Accurate diagnosis and classification of leukemias.
  • Monitoring minimal residual disease post-therapy.
  • Informing therapeutic strategies and predicting patient outcomes.

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