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• W2108375657 abstract "Abstract Background: MYCN amplification (MNA) in neuroblastoma is a strong indicator of poor prognosis. However, some MYCN nonamplified (non-MNA) cases show poor outcomes, and examining the status of the gene requires an operation, which may have surgical complications. Therefore, a new marker is needed to identify cases of non-MNA neuroblastomas with poor prognoses using less risky procedures. Aberrant hypermethylation of the DCR2 promoter has recently been associated with rapidly progressing neuroblastoma. We aimed to develop a noninvasive DCR2 methylation assay for patients with neuroblastoma using serum DNA, which predominantly originates from tumor-released DNA. Methods: Using DNA-based real-time PCR, we simultaneously quantified a methylated-DCR2 specific sequence (M) and a reference sequence (R) located in the promoter region in serum DNA, and evaluated DCR2 methylation status as M/R ratios in 86 patients with neuroblastoma. Results: Serum DCR2 M/R ratios were strongly correlated with those in the tumor (r = 0.67; P = 0.002). DCR2 methylation was associated with stage both in the whole neuroblastoma group and in the non-MNA group (P &lt; 0.001), and DCR2-methylated patients showed significantly poorer 5-year event-free survival in the whole neuroblastoma group (43% versus 84%; P &lt; 0.001), especially in the non-MNA group (12% versus 96%;P &lt; 0.001). Among five DCR2-methylated patients whose clinical courses were followed, serum M/R ratios were close to 0 in the patients in remission, whereas the ratios increased in patients who relapsed. Conclusions: Detection of methylated-DCR2 in serum DNA has promise as a noninvasive assay for predicting prognosis and therapeutic efficacy in neuroblastoma, especially in non-MNA cases. Furthermore, it might be a sensitive marker of tumor recurrence in DCR2-methylated cases." @default.
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• W2108375657 date "2008-11-01" @default.
• W2108375657 modified "2023-09-27" @default.
• W2108375657 title "Circulating Methylated-<i>DCR2</i>Gene in Serum as an Indicator of Prognosis and Therapeutic Efficacy in Patients with<i>MYCN</i>Nonamplified Neuroblastoma" @default.
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• W2108375657 doi "https://doi.org/10.1158/1078-0432.ccr-08-1249" @default.
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