Table 4.

Comparison of the Diagnostic Performance for Lung Cancer Between the CTCs and Examined Tumor-Related Markers.

Method	Number of cases	Sensitivity (%)	Specificity (%)
CTC	9	75	100
CA125	1	8.3	100
CEA	0	0	100
NSE	4	25	83
CA125 + CEA + NSE	5	33	83
CTC + CA125	10	83	100
CTC + CEA	9	75	100
CTC + NSE	10	83	83

CA125: cancer antigen 125; CEA: carcinoembryonic antigen; CTC: circulating tumor cell; NSE: neuron-specific enolase.