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• W2909930878 abstract "Abstract Purpose: Biological explanation for discrepancies in patient-related response to chemotherapy depending on the underlying oncogenic events is a promising research area. TLX1- or TLX3-deregulated T-cell acute lymphoblastic leukemias (T-ALL; TLX1/3+) share an immature cortical phenotype and similar transcriptional signatures. However, their prognostic impacts differ, and inconsistent clinical outcome has been reported for TLX3. We therefore hypothesized that the overlapping transcriptional profiles of TLX1+ and TLX3+ T-ALLs would allow identification of candidate genes, which might determine their distinct clinical outcomes. Experimental Design: We compared TLX1+ and TLX3+ adult T-ALL outcome in the successive French national LALA-94 and GRAALL-2003/2005 multicentric trials and analyzed transcriptomic data to identify differentially expressed genes. Epigenetic regulation of asparagine synthetase (ASNS) and in vitro l-asparaginase sensitivity were evaluated for T-ALL cell lines and primary samples. Results: We show that TLX1+ patients expressed low levels of ASNS when compared with TLX3+ and TLX-negative patients, due to epigenetic silencing of ASNS by both DNA methylation and a decrease of active histone marks. Promoter methylation of the ASNS gene correlated with l-asparaginase sensitivity in both T-ALL cell lines and patient-derived xenografts. Finally, ASNS promoter methylation was an independent prognostic factor for both event-free survival [HR, 0.42; 95% confidence interval (CI), 0.24–0.71; P = 0.001] and overall survival (HR, 0.40; 95% CI, 0.23–0.70; P = 0.02) in 160 GRAALL-2003/2005 T-ALL patients and also in an independent series of 47 LL03-treated T lymphoblastic lymphomas (P = 0.012). Conclusions: We conclude that ASNS methylation status at diagnosis may allow individual adaptation of l-asparaginase dose." @default.
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• W2909930878 date "2019-04-15" @default.
• W2909930878 modified "2023-10-15" @default.
• W2909930878 title "Epigenetic Silencing Affects<scp>l</scp>-Asparaginase Sensitivity and Predicts Outcome in T-ALL" @default.
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• W2909930878 doi "https://doi.org/10.1158/1078-0432.ccr-18-1844" @default.
• W2909930878 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30659025" @default.
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