Table 3.

ROC curve analyses of the L/G ratio of FDG, NH3, DOPA, and the combination of NH3 and DOPA in differentiating TuR and TrE

PET index	AUC	SE of AUC	P values	95% CI
				lower	upper	Optimal cutoff	Specificity%	Sensitivity%
FDG	.726	.091	.056	.547	.905	1.260	100	46.2
NH3	.803	.081	.011	.644	.962	1.515	100	57.7
DOPA	.938	.040	.000	.859	1.000	2.165	100	84.6
DOPA + NH3	.952	.035	.000	.883	1.000	0.832	100	80.8

AUC area under curve, SE standard error, TuR tumour recurrence, TrE treatment effects