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Mirebeau, D; Acquaviva, C; Suciu, S; Bertin, R; Dastugue, N; Robert, A; Boutard, P; Mechinaud, F; Plouvier, E; Otten, J; Vilmer, E; Cave, H; EORTC-CLG
Haematologica (Roma), 07/2006, Letnik: 91, Številka: 7Journal Article
AP-HP, Paris, France. BACKGROUND AND OBJECTIVES: Deletion and methylation of the 9p21 chromosomal region are frequent in childhood acute lymphoblastic leukemia (ALL) but the prognostic significance is controversial. They inactivate CDKN2A, a gene encoding both p16INKa and p14ARF and, in some cases, contiguous genes that may influence chemosensitivity, such as CDKN2B encoding p15INKb or MTAP encoding methylthioadenosine phosphorylase. DESIGN AND METHODS: CDKN2A inactivation by deletion or methylation was studied using gene dosage and methyl-specific polymerase chain reaction. RESULTS: Bi-allelic and mono-allelic inactivation were found in, respectively, 38 (17%) and 31 (14%) of 227 children with B-lineage ALL enrolled in EORTC trials. Although CDKN2A inactivation was more often associated with poor prognostic features in B-lineage ALL, it failed to influence the outcome of the patients significantly. Bi-allelic CDKN2B and MTAP co-inactivation were found in 36 (16%) and 24 (11%) of patients, respectively, and did not influence the 6-year event-free survival rate either, even when the analysis was restricted to CDKN2A inactivated ALL. INTERPRETATION AND CONCLUSIONS: In this study of 227 cases of childhood B-lineage ALL, inactivation of CDKN2A, CDKN2B and MTAP did not influences the patients' outcome.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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