Table 1.

Summary of demographic features of patients (N=302)

Variables	n (%)
Age, median (range)	61 (36–87)
Sex
Male	213 (70.5)
Female	89 (29.5)
Smoking status
Smoker	184 (60.9)
Nonsmoker	118 (39.1)
Pathologic subtypes
Adenocarcinoma	99 (32.8)
Squamous cell carcinoma	95 (31.4)
Small cell lung cancer	108 (35.8)
TNM stage
I	19 (6.3)
II	12 (4.0)
III	156 (51.6)
IV	115 (38.1)