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Immunophenotypic and cytogenetic changes in acute leukaemia at relapse
1Department of Clinical Pathology, Seoul National University College of Medicine, Seoul, Korea.
Clinical and Laboratory Haematology
|September 13, 2001
Summary
Acute leukaemia relapse shows increased aberrant markers and cytogenetic changes, particularly in B lineage acute lymphoblastic leukaemia (ALL). Younger ALL patients exhibit more clonal instability at relapse, suggesting distinct disease evolution pathways.
Area of Science:
- Hematology
- Oncology
- Molecular Biology
Background:
- Relapse in acute leukaemia often involves significant biological changes.
- Understanding these changes is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate immunophenotypic and cytogenetic alterations in acute leukaemia at relapse.
- To compare these changes between acute myelogenous leukaemia (AML) and acute lymphoblastic leukaemia (ALL).
Main Methods:
- Retrospective analysis of 99 Korean patients with acute leukaemia.
- Immunophenotyping and cytogenetic analysis at initial diagnosis and relapse.
Main Results:
- Over 50% of patients showed immunophenotypic changes at relapse, with increased aberrant marker expression, especially in B lineage ALL.
- Cytogenetic changes were observed in over 60% of patients, more frequent in B lineage ALL than AML.
- Younger ALL patients with cytogenetic changes at relapse were identified.
Conclusions:
- Relapse in acute leukaemia is characterized by clonal instability, evidenced by aberrant marker gain and cytogenetic changes.
- B lineage ALL demonstrates a higher propensity for these changes compared to AML.
- Younger patients with ALL are more susceptible to relapse-associated clonal evolution.