Table 3.

Cut-off values of the clinical characteristics in cIA stage NSCLC patients

Variable	Cut-off point	AUC	Sensitivity	Specificity	95% CI	p
Clinical tumor size	21.5	0.616	0.639	0.555	0.550–0.681	0.002
Serum CEA level	3.85	0.643	0.514	0.792	0.567–0.719	<0.001
Serum NSE level	13.40	0.592	0.569	0.694	0.514–0.669	0.012

cIA: clinical stage IA; NSCLC: non-small cell lung cancer; AUC: area under the curve; CI: confidence interval; CEA: carcinoembryonic antigen; NSE: neuron-specific enolase