Prediction of onset of remnant gastric cancer by promoter DNA methylation of CDO1 / HOPX / Reprimo / E-cadherin .

Background: Early detection of remnant gastric cancer (RGC) is required to reduce the risk of death, but long-term endoscopic surveillance is difficult after gastrectomy. In this study, data for the methylation status of 4 methylation genes ( CDO1, HOPX, Reprimo, and E-cadherin ) to predict the onset of RGC are presented.
Results: The 4 genes showed hypermethylation in RGC tumors in contrast to the corresponding non-cancerous mucosa tissues. The methylation level in the non-cancerous mucosa tissues of the initial surgery was obviously high in initial malignant disease for CDO1 ( P = 0.0001), while in initial benign one for E-cadherin ( P = 0.003). Promoter DNA methylation status in the remnant non-cancerous mucosa tissues together with the basic clinical data in turn predicted either initial malignant disease or initial benign disease with a high AUC score of 0.94, suggesting that methylation events are differentially recognized between the initial malignant and benign disease. We then finally confirmed that 4 genes hypermethylation of the non-cancerous tissues by biopsy prior to onset of RGC could predict terms until RGC occurred ( P < 0.0001).
Methods: A total of 58 RGC patients were used to establish the model. The 4 genes promoter methylation were analyzed for DNA obtained from the patient's specimens using quantitative methylation specific polymerase chain reaction.
Conclusions: This risk model would help provide guidance for endoscopic surveillance plan of RGC after gastrectomy.
Competing Interests: CONFLICTS OF INTEREST The authors declare no conflicts of interest.