Table 2.

Sensitivity, specificity, and AUC of different cut-off values of GTV-P for survival prediction in the 346 patients with locally advanced NPC

End-point	GTV-P cut-off value
	46.4 mL			57.9 mL			75.4 mL
	Sensitivity (%)	Specificity (%)	AUC	Sensitivity (%)	Specificity (%)	AUC	Sensitivity (%)	Specificity (%)	AUC
OS	59.4	66	0.662	39.1	79.4	–	26.6	90.4	–
LRFS	50	62	–	62.5	77.9	0.702	25	88	–
DMFS	61.8	65.6	–	40	79.2	–	36.4	91.8	0.668
DFS	56.6	66.9	0.668	37.5	80.1	–	26.5	91.6	–

Twelve patients were lost to follow-up and, thus, were not included in the survival analysis

AUC area under the curve, OS overall survival, LRFS local relapse-free survival, DMFS distant metastasis-free survival, DFS disease-free survival

– AUC of inferior cut-off value for the endpoint was not calculated