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Although deletions of cell cycle regulatory gene loci have long been reported in various malignancies, little is known regarding their relevance in pediatric T-cell lymphoblastic lymphoma (T-LBL) and T-cell lymphoblastic leukemia (TALL). The current study focused on loss of heterozygosity (LOH) analyses of the CDKN2A/B (chromosome 9p), ATM (chromosome 11q) and p53 (chromosome 17p) gene loci. Frequencies of LOH were compared in 113 pediatric T-LBL and 125 T-ALL who were treated uniformly according to ALL-BFM strategies. Furthermore, LOH findings were correlated with clinical characteristics and tested for their prognostic relevance. LOH at 9p was detected in 47% of T-LBL and 51% of T-ALL, and was associated with male gender in both. In T-ALL, LOH at 9p was associated with favorable initial treatment response. A tendency for favorable event-free-survival was observed in LOH 9p positive T-LBL. The frequency of LOH at chromosomes 11q and 17p was 5% or less for both diseases.

haematologica

Frequency and clinical relevance of DNA microsatellite alterations of the CDKN2A/B, ATM and p53 gene loci: a comparison between pediatric precursor T-cell lymphoblastic lymphoma and T-cell lymphoblastic leukemia