Correlation of dynamic contrast-enhanced ultrasonography and the Ki-67 labelling index in pancreatic ductal adenocarcinoma

Figure 3 Diagnostic efficacy of relative half-decrease time for differentiating between the high group and low Ki-67 expression groups. The relative half-decrease time ≥ 1.07 was more helpful in accurately predicting high Ki-67 expression. ROC: Receiver operating characteristic curve.