Table1. Clinicopathological features of M0 group.

Variables	Signet ring cell carcinoma (A) (N=3,715)			Well and moderately differentiated AC (B) (N=5,312)				Poorly differentiated AC (C) (N=7,455)
	N	%		N	%	P (A vs. B)		N	%	P (A vs. C)
Age (yrs)						<0.001				<0.001
Mean	60			66				63
SD	12.2			9.8				10.9
Gender						<0.001				<0.001
Male	1,954	52.6		3,866	72.8			4,919	66
Female	1,761	47.4		1,446	27.2			2,536	34
Race						0.018				0.749
White	2,460	66.5		3,579	67.6			4,892	65.8
Black	484	13.1		755	14.3			989	13.3
Othera	754	20.4		963	18.2			1,553	20.9
AJCC stage						<0.001				<0.001
I	412	21.0		869	37.4			642	16.8
II	432	22.0		728	31.4			1,051	27.5
III	1,119	57.0		725	31.2			2,133	55.8
T stage						<0.001				<0.001
T1	816	22		1,897	35.7			1,250	16.8
T2	367	9.9		806	15.2			889	11.9
T3	1,210	32.6		1,627	30.6			2,829	37.9
T4a	1,020	27.5		750	14.1			1,938	26
T4b	302	8.1		232	4.4			549	7.4
Node stage						<0.001				<0.001
N0	625	31.8		1,250	53.8			1,108	29.0
N1	228	11.6		389	16.8			621	16.2
N2	300	15.3		329	14.2			743	19.4
N3a	438	22.3		274	11.8			828	21.6
N3b	372	19.0		80	3.4			526	13.7
Examined LN						<0.001				0.130
≥15	1,963	52.8		2,322	43.7			3,826	51.3
<15b	1,752	47.2		2,990	56.3			3,629	48.7
Tumor location						<0.001				<0.001
Upper stomach	695	26.4		2,282	53.1			2,520	43.6
Middle stomach	402	15.2		392	9.1			696	12.1
Lower stomach	1,185	44.9		1,420	33			2,028	35.1
Overlapping	355	13.5		203	4.7			531	9.2
Tumor size (cm)						<0.001				0.230
≥5	1,324	42.8		1,525	31.9			2,923	55.9
<5	1,770	57.2		3,254	68.1			3,707	44.1

yrs, years; SD, standard deviation; LN, lymph node; AJCC, American Joint Committee on Cancer. ^aincludes American Indian/AK Native, Asian/Pacific Islander; ^bexamined lymph nodes <15 was defined as pNx.