Table 2.

Characteristics of NSCLC patients and cancer-free smokers in a testing set

	NSCLC cases (n = 89)	Controls (n = 107)	p value
Age	65.25 (SD 11.28)	65.36 (SD 11.48)	0.30
Sex			0.36
Female	31	37
Male	58	70
Smoking pack-years (median)	35.76	33.29	0.32
Stage
Stage I	22
Stage II	23
Stage III	21
Stage IV	23
Histological type
Adenocarcinoma	49
Squamous cell carcinoma	34
Large cell carcinoma	6

Abbreviations: NSCLC non-small cell lung cancer