Table 2.

Concentrations of SCCA, NSE, CEA, and CYFRA21-1 in serum (ng/mL, $\stackrel{-}{x}\pm s$).

Group	Number	SCCA	NSE	CEA	CYFRA21-1
Lung cancer	132	1.73 ± 3.98*	19.45 ± 14.47∗∗★	17.81 ± 35.79∗∗★★	6.54 ± 7.36∗∗★★
Pulmonary benign disease	48	0.38 ± 0.55	10.88 ± 1.87	1.13 ± 0.24**	1.72 ± 0.83**
Healthy control	92	0.17 ± 0.10	9.09 ± 2.81	0.78 ± 0.30	1.03 ± 0.52

P value was calculated by Student's t-test *compared to healthy control, P < 0.05; **compared to healthy control, P < 0.01.

^★compared to pulmonary benign disease, P < 0.05; ^★★compared to pulmonary benign disease, P < 0.01.