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Receiver operating characteristic (ROC) curve to predict the prevalence of radioiodine refractory cancer. A, The optimal metastatic lymph node number was 4, and the area under the ROC curve (AUC) was 0.753. The sensitivity and specificity were 77.7% and 67.4%, respectively. B, The optimal metastatic lymph node rate was 53%, and the area under the ROC curve (AUC) was 0.833. The sensitivity and specificity were 86.6% and 76.6%, respectively
