Table 1. Clinicopathological characteristics of the patients included in this study.

	n=178
Characteristics	n	(%)
Gender
Male	127	(71)
Female	51	(29)
Histology
Adenocarcinoma	64	(36)
BAC	6	(3)
Squamous cell carcinoma	77	(43)
Large cell carcinoma	24	(14)
Others	7	(4)
Smoking status
Never	3	(2)
Former	70	(39)
Current	60	(34)
Unknown	45	(25)
Tumor stage
I	90	(51)
II	52	(29)
III	36	(20)
Treatment
No treatment	133	(75)
Pre-operative chemotherapy	28	(16)
Post-operative chemotherapy	3	(2)
Post-operative radiotherapy	11	(6)
Pre-operative chemo/radiotherapy	3	(1)
Type of surgery
Pneumonectomy	53	(30)
Lobectomy	111	(62)
Bilobectomy	8	(5)
Wedge resection	6	(3)
Resection
Complete resection (R0)	123	(69)
Microscopic residue (R1)	36	(20)
Macroscopic residue (R2)	9	(5)
Uncertain	10	(6)