Table 1. The clinicopathological characteristics of patients and Kaplan-Meier analyses (log-rank test) of their predictive value on OS.

	n	%	OS (days)
			No. of events	mean survival	95% CI		p-value
Age(y)							0.234
≤ 50	131	28.8	32	752.885	694.26	811.51
> 50	324	71.2	61	844.22	806.634	881.805
Median (range)	56(21-85)
Sex							0.625
male	305	67.0	60	837.261	797.832	876.691
female	150	33.0	33	772.708	720.629	824.787
Tumor differentiation							<0.001 (9.45E-05)
G1	38	8.4	1	885.500	831.414	939.586
G2	193	42.4	35	851.104	802.927	899.28
G3	186	40.9	45	753.595	705.069	802.12
Mucinous adenocarcinoma	17	3.7	1	866.235	764.003	968.468
Signet ring cell carcinoma	21	4.6	11	565.178	410.578	719.778
Lauren classification							0.289
intestinal type	335	73.6	66	837.305	799.707	874.903
diffuse type	38	8.4	12	703.724	593.202	814.246
mixed type	82	18.0	15	778.464	714.768	842.159
Tumor site							0.196
Upper one-third/Cardia	69	15.2	19	772.059	685.282	858.836
Middle one-third	178	39.1	30	864.453	816.441	912.465
lower one-third	208	45.7	44	770.669	725.636	815.701
Pathological TNM stage							<0.001 (5.99E-11)
StageI (IA/IB)	120	26.4	4	920.141	895.06	945.221
StageII (IIA/IIB)	108	23.7	15	883.541	823.328	943.754
StageIII (IIIA/IIIB/IIIC)	227	49.9	74	675.781	628.214	723.347
T stage							<0.001 (8.22E-07)
T1	96	21.1	3	920.821	892.625	949.018
T2	59	13.0	8	806.526	738.635	874.417
T3	50	11.0	9	797.332	711.579	883.086
T4	250	54.9	73	754.549	705.547	803.551
N stage							<0.001 (7.27E-12)
N0	188	41.3	15	941.968	908.067	975.869
N1	66	14.5	9	835.202	769.567	900.837
N2	79	17.4	21	689.154	611.773	766.534
N3	122	26.8	48	618.658	552.33	684.985
SII							<0.001 (5.01E-05)
<572	335	75.3	55	868.166	833.559	902.773
≥572	110	24.7	36	635.978	571.650	700.306

OS, Overall survival; SII, systemic immune-inflammation index; CI, confidence interval.