Risk factors for lymph node metastasis and evaluation of reasonable surgery for early gastric cancer

Table 4 Depth of invasion, histological type, macroscopic type, lymphatic penetration of lymph node metastasis and tumor maximum diameter in the lower third of stomach

Factors	Group 1 metastasis (person)						Group 2 metastasis (person)
	No.3	No.4	No.5	No.6	Total	P value	No.1	No.7	No.8a	No.9	Total	P value
Tumor maximum diameter (cm)
≤ 1.0	1	0	0	3	4		0	0	0	0	0
1.1-2.0	4	4	2	4	11		0	3	3	0	5
2.1-3.0	0	2	1	0	3		0	1	0	0	1
> 3.0	7	10	0	7	17	0.143	1	9	4	2	12	0.018
Histological type
Diff	4	4	0	4	8		0	2	0	1	2
Undiff	8	12	3	10	27	0.025	1	11	7	1	16	0.006
Depth of invasion
M	1	4	2	3	9		1	0	0	0	1
Sm	11	12	1	11	26	0.010	0	13	7	2	17	< 0.001
Growth manner
Mass	5	5	0	5	10		0	4	3	1	7
Nest	3	3	2	2	8	0.669	0	3	2	1	4	0.689
Diffuse	4	8	1	7	17		1	6	2	0	7
Macroscopic type
Protruded	0	2	0	0	2		0	0	0	0	0
Flat	1	2	0	1	3		0	2	0	0	2
Depressed	11	12	3	13	30	0.819	1	11	7	2	16	0.501
Lymphatic invasion
Negative	10	13	2	11	27		1	8	6	2	13
Positive	2	3	1	3	8	< 0.001	0	5	1	0	5	< 0.001

Diff: Differentiated histological type; Undiff: Undifferentiated histological type; M: Mucosa; Sm: Submucosa.