Table 1. Baseline characteristics and operative outcomes of the patients.

Characteristics		No. of patients (%) (n = 82)
Age at diagnosis, yr		61.0 ± 8.7
Sex
	Female	41 (50.0)
	Male	41 (50.0)
Smoking
	< 10 pack-years	56 (68.3)
	≥ 10 pack-years	26 (31.7)
History of malignancy
	No	62 (75.6)
	Yes	20 (24.4)
Multiple tumour resection during the first surgery
	No	61 (74.4)
	Yes	21 (25.6)
Pathophysiology of resected tumour
	Adenocarcinoma	78 (95.1)
	Others	4 (4.9)

Values are expressed as mean ± standard deviation or number (%).