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Receiver operating characteristic curve analysis to determine a cutoff value of MOS methylation level to predict the risk for metachronous recurrence (n=124). Optimal cutoff value was 35.82% and sensitivity, specificity, PPV and NPV were 80.0%, 53.2%, 26.7%, and 92.6%, respectively. AUC, area under curve; NPV, negative predictive value; PPV, positive predictive value.
