Table 3.

Relation between the expression transformation of claudin-1 and biological behaviors of gastric carcinomas

	n	Low-expression in mucosa	Over-expression in invasive front
Histological type
Well-moderately differentiated	17	33	30
Poorly differentiated	9	57	17
Mucinous	2	17	10
Depth of invasion
Lamina propria or submucosa	1	17	2
Muscularis propria	1	19	10
Visceral peritoneum	26	71	45
Lymph node metastasis
Negative	8	46	14
Positive	20	61	43