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Normal and tumor samples (A). The AUC (0.659) indicated a limited diagnostic capability. Subgroup analyses: Stage Ⅰ (B) (AUC: 0.592), Stage Ⅱ (C) (AUG:0.673), Stage Ⅲ (D) (AUG:0.659), Stage Ⅳ (E) (AUG:0.828). Abbreviations: AUC, area under the curve; ROC, receiver operating characteristic.
