Preoperative risk stratification of early recurrence in resected pancreatic ductal adenocarcinoma: Novel equilibrium-phase-computed tomography biomarker of extracellular volume

Table 3 The efficacy of each parameter in predicting early recurrence

Characteristic	Combined ECV and CA19-9	CT-derived ECV	CA19-9	Tumor grade
Cutoff value	0.45	35.37	55.00	Ref.
AUC (95%CI)	0759 (0.653-0.846)	0.736 (0.628-0.827)	0.686 (0.575-0.784)	0.650 (0.538-0.752)
Sensitivity	87.80	80.49	90.24	60.98
Specificity	69.52	59.42	45.24	69.05
P value	< 0.001	< 0.001	0.002	0.005

CA19-9: Carbohydrate antigen 19-9; ECV: Extracellular volume; CT: Computed tomography; AUC: Area under the curve; CI: Confidence interval.