Table 1. Characteristics of NSCLC patients.

Characteristics
Gender	Male	112 (66.3%)
	Female	57 (33.7%)
Age	<60	71 (42.0%)
	≥ 60	98 (58.0%)
Histology	ADC	112 (66.3%)
	SCC	51 (30.2%)
	OC	6 (3.6%)
Smoking status	Never	69 (40.8%)
	Former	31 (18.3%)
	Current	69 (40.8%)
Location of primary tumor	Center	63 (37.3%)
	Peripheral	106 (62.7%)
Staging	I	14(8.3%)
	II	16 (9.5%)
	III	45 (26.6%)
	IV	94 (55.6%)
CTC counts	≥ 1	40 (23.7%)
	≥ 2	20 (11.8%)
	≥ 5	13 (7.7%)

ADC*: adenocarcinoma.

SCC*: squamous cell carcinoma.

OC*: other carcinomas, including large cell, mixed cell carcinoma, or undifferentiated carcinoma.