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Receiver operation curve analysis of the Ki-67 labeling index. (A) Ki-67 labeling index can distinguish a serous tubal intraepithelial carcinoma from a normal fallopian tube with high sensitivity and specificity and the area under the curve (AUC) is 0.999. (B) Ki-67 labeling index is not useful in distinguishing a serous tubal intraepithelial carcinoma from a high-grade serous carcinoma with an AUC of only 0.519.
