1.

Univariate analysis of potential risk factors for LNM in patients with intramucosal gastric cancer (386 patients)

Variable	LNM		Positive(%)	X2	P
	Positive (n=40)	Negative(n=346)
LNM, lymph node metastasis.
Age (year)				2.348	0.125
≤60	30	217	12.1
>60	10	129	7.2
Gender				1.640	0.182
Male	20	226	8.1
Female	20	120	14.3
Tumor location				0.998	0.318
Upper 1/3	3	45	6.3
Lower 2/3	37	301	10.9
Macroscopic type				1.930	0.749
1	2	8	20.0
2a	1	10	9.1
2b	17	127	11.8
2c	9	101	8.2
3	11	100	9.9
Ulcer				0.494	0.482
Negative	22	170	11.5
Positive	18	176	9.3
Histological type				13.094	<0.001
Well differentiated	6	155	3.7
Poorly or undifferentiated	34	191	15.1
Size (cm)				1.233	0.267
≤2	21	213	9.0
>2	19	133	12.5
Vascular or lymphatic invasion				10.309	0.001
Negative	37	343	9.7
Positive	3	3	50.0