Table 2. Patient characteristics.

Characteristics	Patients (N=646), n [%]
Sex
Male	264 [41]
Female	382 [59]
Histology
Adenocarcinoma	475 [74]
Squamous cell	125 [19]
Others	46 [7]
Pathologic stage1
IA	285 [44]
IB	181 [28]
IIA	90 [14]
IIB	52 [8]
IIIA	36 [6]
IIIB	0 [0]
IV	2 [0]

¹, the 7th edition AJCC TNM classification was used.