Table 1. Patient characteristics (n=65).

Variable	Number (%) or (range)
Sex
Men	48 [74]
Women	17 [26]
Median age (range), years	66 [26–82]
Smoking habits
Ever-smoker	58 [89]
Never-smoker	7 [11]
Operation procedure (lobectomy)	65 [100]
Median radiological tumor size (range), cm	3.4 (1.5–6.4)
Histological type
Adenocarcinoma	42 [64]
Squamous cell carcinoma	18 [28]
Large cell carcinoma	2 [3]
Pleomorphic carcinoma	3 [5]
Median pathological tumor size (range), cm	3.5 (1.5–7.0)
Lymph node metastasis
N0	50 [77]
N1–2	15 [23]
Pathological stage
I	38 [58]
II	20 [31]
III	7 [11]
Vascular invasion (present)	48 [74]
Visceral pleural invasion (present)	23 [35]
Tumor differentiation
Poor/undifferentiated	16 [25]
Well/moderate	49 [75]
Necrosis in cavity
Present	32 [49]
Absent	33 [51]