4.

Univariate analysis of potential risk factors for LNM in intramucosal gastric cancer conforming to expanded ESD indication (183 cases)

Variable	LNM		Positive (%)	X2	P
	Positive (n=16)	Negative (n=167)
LNM; lymph node metastasis; ESD, endoscopic submucosal dissection.
Ulcer				1.406	0.181
Negative	12	100	10.7
Positive	4	67	5.6
Histological type				4.262	0.036
Well differentiated	5	97	4.9
Poorly or undifferentiated	11	70	13.6
Size (cm)				0.385	0.357
≤2	9	107	7.8
>2 and≤3	7	60	10.4
Vascular or lymphatic invasion
Negative	16	167	8.7
Positive	0	0	0