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National Repository of Grey Literature 1 records found  Search took 0.00 seconds. 
Frequency and significance of genetic changes in the genome of leukemia cells in children with T-ALL
 Sládková, Lucie ; Zemanová, Zuzana (advisor) ; Březinová, Jana (referee)
T-ALL (T-cell acute lymphoblastic leukemia) is identified in 10-15 % cases of pediatric acute lymphoblastic leukemia and it is a clinically and genetically heterogeneous disease. About 50 % of patients have normal karyotype and although a number of cryptic recurrent chromosome aberrations have been reported their prognostic significance is not entirely clear. The aim of the study was to analyze bone marrow cells of children with T-ALL using cytogenomic methods to determine the frequency of cryptic aberrations and to assess their importance for disease prognosis. We examined diagnostic samples of 67 children with T-ALL (19 girls and 48 boys, median age 8 years). We analyzed the changes by G- banding, I-FISH (Dako, Abbott) and MLPA (MRC-Holland) methods. We detected cryptic aberrations in 60 children (91 %). The most frequent changes were deletions of the CDKN2A gene (48×) which were usually observed in combination with other changes and aberrations of loci for TCR genes (20×). TLX3 gene rearrangements were detected in 18 cases and were never associated with rearrangements of TCR loci. Complex karyotype was detected in 10 patients with recurrent breakpoints 5q35 and 10q24. 45 patients live in the first or second complete remission, relapse occurred in 14 children and 20 died. Statistical analysis of...
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