1.

Clinical pathological data of gastric cancer patients (N=746)

Variables	Development set (N=684)			Validation set (N=62)		P
	n	%		n	%
Age						0.121
≥65 years	120	17.5		16	25.8
Sex						0.790
Male	370	54.1		32	51.6
Tumor location						0.146
Gastric cardia	195	28.5		25	40.3
Middle	220	32.2		16	25.8
Antrum	269	39.3		21	33.9
Tumor size						0.188
<5 cm	202	29.5		13	21.0
CEA level						0.884
<5 μg/mL	485	70.9		45	72.6
Pathological staging						0.131
Well	12	1.8		3	4.8
Moderate	44	6.4		7	11.3
Poor	628	91.8		52	83.9
Signet ring cell carcinoma						<0.001
Yes	248	36.3		9	14.5
No	431	63.0		42	67.7
Undefined	5	0.7		11	17.7
Peritoneal seeding						<0.001
1	136	19.9		27	43.5
2	211	30.8		9	14.5
3	337	49.3		26	41.9
Ascites grading*						0.448
0	372	54.4		40	64.5
1	136	19.9		11	17.7
2	76	11.1		5	8.1
3	100	14.6		6	9.7
Extraperitoneal metastasis						0.008
Without	438	64.0		50	80.6
Performance status**						0.031
0	137	20.0		10	16.1
1	367	53.7		25	40.3
2	148	21.6		21	33.9
3	32	4.7		6	9.7
Pathological T staging***						0.154
T3	114	38.5		24	50.0
T4a/b	182	61.5		24	50.0
Table 1 (continued)