Table 1.

Clinicopathological features and expression of circ0001666 in 50 patients with NSCLC

Clinicopathological features	Group	Number of patients	circ0001666 expression		p value
			Low	High
Age	<60	13	8	5
	≥60	37	17	20	0.5202
Gender	male	29	13	16
	female	21	12	9	0.5672
Smoker	smoker	18	6	12
	nonsmoker	32	19	13	0.1398
Tumor size (cm)	<3	19	14	5
	≥3	31	11	20	0.0186
Lymph node metastasis	no	20	16	4
	yes	30	9	21	0.0012
Stage	Ⅰ+Ⅱ	22	15	7
	Ⅲ+Ⅳ	28	10	18	0.0450
Total		50	25	25

Chi-square (or Fisher's exact) test.