Study on the risk factors of lymphatic metastasis and the indications of less in vasive operations in early gastric cancer

Table 1 Lymphatic metastasis relating to gross types (%)

Gross types	m Ca (n = 275)	sm Ca (n = 245)
IIc + III	2.5 (2/85)*,b	25.3 (20/79)
IIc	1.7 (2/120)b	20.2 (17/84)
IIb	0 (0/3)	0 (0/4)
IIa + IIc	0 (0/29)	23.8 (10/42)
IIa	0 (0/34)	25.0 (2/8)
I	0 (0/4)	17.9 (5/28)

*Number of positive lymph nodes/total numbers of cases.

^bP < 0.01, vs each subgroup of II_b, II_a + II_c, II_a orItypes.

Table 2 Lymphatic metastasis relate(LMR) of m and sm Ca(%)

Invading depth	n1 LMR	n2 LMR	Total LMR
m Ca (n = 275)	1.1 (3)*	0.4 (1)	1.5 (4)b
sm Ca (n = 245)	16.7 (41)	5.3 (13)	22.0 (54)
Total cases (n = 520)	8.5 (44)	2.7 (14)	11.2 (58)

^*Numker of cases.

^bP < 0.01, vs sm Ca.

Table 3 Lymphatic metastasis related to tumor size with or without ulcer (%)

Ulcer diameter(cm)	m Ca (n = 275)		sm Ca (n = 245)
	With ulcer(n = 111)	Without ulcer(n = 164)	With ulcer(n = 110)	Without ulcer(n = 135)
≤ 2	0 (0/43)	0 (0/79)	16.7 (3/18)	3.1 (1/32)
～3	0 (0/21)	2.4 (1/42)	20.8 (5/24)	21.1 (8/38)
～4	5.3 (1/19)	0 (0/15)	20.0 (4/20)	24.0 (6/25)
～5	6.7 (1/15)	0 (0/14)	18.8 (3/16)	18.2 (4/22)
≥ 6	1 (1/13)	0 (0/14)	43.8 (14/32)	33.3 (6/18)
Total No	2.7 (3/111)a	0.6 (1/164)	26.4 (29/110)a	18.5 (25/135)

^aP < 0.05, vs ulcer subgroup in each group.