Table 1. Clinicopathological variables of NSCLC patients and normal healthy controls (n, %).

Variables	NSCLC cases (n = 205)	Normal controls (n = 210)
Age (years)	61.6 ± 9.8	60.6 ± 11.1
Gender (n, %)
Male	134 (65.4)	120 (57.1)
Female	71 (34.6)	90 (42.9)
Smoking status (n, %)
Non-smoker	58 (28.3)	92 (43.8)
Smoker	147 (71.7)	118 (56.2)
Histology
Adenocarcinoma	116 (56.6)
Squamous cell carcinoma	76 (37.1)
Other	13 (6.3)
TNM stage
I+II	61 (29.8)
III+IV	144 (70.2)
Differentiation
Well	46 (22.4)
Moderate and low	144 (70.3)
Unknown	15 (7.3)
Lymph node metastases
Negative	75 (36.6)
Positive	130 (63.4)
Distant metastases
Negative	155 (75.6)
Positive	50 (24.4)