Table 1.

Baseline patient characteristics

Characteristics	Brain metastasis (N = 26)	Liver metastasis (N = 16)	Locally advanced (N = 25)	Healthy control (N = 5)
Age group-no. (%)
< 55 year	6 (23.1%)	3 (18.8%)	2 (8.0%)	5 (100.0%)
55–64 year	14 (53.8%)	8 (50.0%)	15 (60.0%)	0 (0.0%)
≥ 65 year	6 (23.1%)	5 (31.2%)	8(32.0%)	0 (0.0%)
Median age (range)-year	59 (40–77)	61 (41–70)	61 (44–72)	33 (25–46)
Gender
Male-no. (%)	17 (65.4%)	11 (68.8%)	19 (76.0%)	1 (20.0%)
Female-no. (%)	9 (34.6%)	5 (31.2%)	6 (24.0%)	4 (80.0%)
History of tobacco use-no. (%)
Never	9 (34.6%)	3 (18.8%)	10 (40.0%)	5 (100.0%)
Previous and current	15 (57.7%)	10 (62.4%)	14 (56.0%)	0 (0.0%)
Unknown	2 (7.7%)	3 (18.8%)	1 (4.0%)	0 (0.0%)
Histologic subtype-no. (%)
Non-small cell lung cancer	20 (76.9%)	8 (50.0%)	15 (60.0%)	–
Small cell lung cancer	6 (23.1%)	8 (50.0%)	10 (40.0%)	–