Table 1.

Clinical Characteristics

Factors		Number of Patients
Age	<65	45
	≥65	131
Gender	Male	94
	Female	82
Smoking	Never	78
	Current/former	98
Histology	Adenocarcinoma	130
	Others	46
pStage	I	133
	II-III	43
pT status	pT1	123
	pT2-3	53
pN status	pN0	152
	pN1-2	24
CEA	Normal	129
	High	47
KL-6	Normal	161
	High	15

CEA, carcinoembryonic antigen; KL-6, Krebs von den Lungen-6