Table 1. Clinical data of the specimens.

Parameter		Tissue specimens		Serum specimens
		Group
		Lung cancer	Benign lung disease	Lung cancer	Benign lung disease
		(n = 72)	(n = 60)	(n = 72)	(n = 69)
Gender
	Male	46	35	46	40
	Female	26	25	26	29
Age, years
	Median	64	58	64	58
	Interquartile range	37-82	28-85	37-82	26-87
Smoking history
	Yes	38		38
	No	34		34
Pathological type
	Lung adenocarcinoma	38		38
	Lung squamous cell carcinoma	24		24
	Small cell lung cancer	4		4
	Bronchoalveolar carcinoma	4		4
	Small cell lung cancer + adenocarcinoma	1		1
	Small cell lung cancer + squamous cell carcinoma	1		1
Clinical stage
	I/II	51		51
	III/IV	21		21