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ROC curve of preoperative PRL concentration (FCP). ROC curve revealed that preoperative PRL concentration (FCP) of 2.35-fold was the optimal cutoff point for prediction of postoperative PRL normalization (AUC, 0.7357; P = .00673). AUC = area under ROC curve; FCP = fold change of PRL; PRL = prolactin; ROC = receiver operating characteristics.
