Table II. Characteristics of the study participants in the training/testing phase.

The abbreviations used are as follow: S.D., standard deviation; SCC, squamous cell carcinoma; SRCC, signet ring cell carcinoma; CEA, carcinoembryonic antigen; AFP, alpha feto protein; TNM, tumor node metastasis.

Variable	No.	Mean	%
GC count	300
Age, years
Mean		59.55
S.D.		11.43
Sex
Male	222		74
Female	78		26
CEA
≤5 ng/ml	250		83
>5 ng/ml	50		17
CA 12-5
≤35 units/ml	282		94
>35 units/ml	18		6
CA 19-9
≤37 units/ml	256		85
>37 units/ml	44		15
CA 72-4
≤6 units/ml	237		79
>6 units/ml	63		21
AFP
≤30 units/ml	295		98
>30 units/ml	5		2
Tumor size
≤3 cm	156		52
>3 cm	144		48
Differentiation
Poor	144		48
Moderate	81		27
High	7		2
Others	68		23
Infiltration depth (T)
T1+T2	126		42
T3+T4	174		58
Positive lymph nodes (N)
≤6	227		76
>6	73		24
Metastasis (M)
M1	13		4%
M0	293		98
TNM stage
I	95		32
II	61		20
III	131		44
IV	13		4
Pathological type
Adenocarcinoma	231		77
SCC	4		1
SRCC	18		6
Others	47		16
Patients' status
Survival	67		22
Death	233		78
Median survival time (months)
		27.22
Healthy count
Age, years	300
Mean		54.89
S.D.		10.45
Sex
Male	143		48
Female	157		52
CEA	160
≤5 ng/ml	155		97
>5 ng/ml	5		3
CA 12-5	90
≤5 units/ml	90		100
>35 units/ml	0		0
CA 19-9	88
≤37 units/ml	87		99
>37 units/ml	1		1
CA 72-4	80
≤6 units/ml	71		89
>6 units/ml	9		11
AFP	151
≤0 units/ml	151		100
>30 units/ml	0		0