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Prognostic significance of karyotype analysis in children with acute lymphoblastic leukemia
R Ankathil1, J Stephen, D M Vasudevan
1Regional Cancer Centre, Trivandrum, Kerala, India.
Insights
Chromosome analysis in children with Acute Lymphoblastic Leukemia (ALL) can predict prognosis. Specific chromosomal abnormalities indicate poor, intermediate, or good survival outcomes, guiding tailored therapy.
Area of Science:
- Cytogenetics
- Pediatric Oncology
- Hematology
Background:
- Acute Lymphoblastic Leukemia (ALL) is a common childhood cancer.
- Accurate prognostic indicators are crucial for optimizing treatment strategies in pediatric ALL.
- Chromosomal abnormalities are known to influence ALL prognosis.
Purpose of the Study:
- To investigate the potential of chromosomal findings as prognostic indicators in children with ALL.
- To correlate specific karyotype patterns with patient prognosis and survival.
- To establish a basis for risk-stratified therapy in pediatric ALL.
Main Methods:
- Bone marrow samples from 26 pretreated children (under 15 years) with ALL were analyzed.
- Karyotype analysis was performed to identify numerical and structural chromosomal abnormalities.
- Patients were grouped based on karyotype patterns and followed for prognosis and survival evaluation.
Main Results:
- Abnormal karyotypes were found in 57.6% of patients.
- Frequently involved chromosomes in numerical abnormalities included 8, 18, and 21.
- Specific findings associated with prognosis: hyperdiploidy (>51 chromosomes) indicated good prognosis; normal karyotype and 6q- deletion showed intermediate prognosis; t(4;11), trisomy 8, trisomy 18, trisomy 21, and hypodiploidy indicated worst prognosis.
Conclusions:
- Karyotype analysis before treatment is a valuable tool for classifying pediatric ALL patients into distinct prognostic groups (poor, intermediate, good).
- This classification enables the design of individualized and risk-adapted therapeutic approaches.
- Chromosomal findings serve as significant prognostic biomarkers in pediatric Acute Lymphoblastic Leukemia.
Abstract:
Chromosome studies, using bone marrow samples of 26 pretreated children (below 15 years of age) with Acute Lymphoblastic Leukemia were carried out to explore the potentialities of applying chromosomal findings as a prognostic indicator in these patients. Abnormal karyotype was identified in 15 patients (57.6 per cent). The chromosomes frequently involved in non-random numerical abnormalities were Nos. 8, 18 and 21. Structural chromosome changes observed consisted of deletion 6q- and translocation t (4;11). After karyotype analysis, patients were grouped into subsets on the basis of the karyotype pattern observed. They were followed up to evaluate their prognosis and survival period. Patients showing hyperdiploid clone with greater than 51 chromosomes had the best prognosis. Patients with normal karyotype and patients with deletion of the long arm of chromosome 6 showed intermediate prognosis whereas patients showing t (4;11), trisomy 8, trisomy 18, trisomy 21, and hypodiploid karyotype were associated with worst prognosis. Thus, karyotype analysis before treatment helps to classify ALL patients as poor, intermediate and good prognosis groups and on this basis therapy can be designed accordingly.