Table 1.

Characteristics of the study cohorts.

Variables	Lung cancer patients (case), n = 17	Healthy Kemerovo residents (control), n = 17
Age (years) (mean ± SD)	56.1 ± 11.5*	55.7 ± 4.1
Smoking status (%):
Smokers	70.6	64.7
Non-smokers	29.4	35.3
Cancer type* (%):
Squamous cell lung cancer	29.4
Adenocarcinoma	29.4
Large cell lung carcinoma	17.7
Other lung cancers	23.5
TNM** (%):
I, II	35.3
III, IV	64.7

*Histological type; **tumor-node-metastasis.