Table 4. Five-year overall survival rates of patients with ESCC according to various clinicopathological parameters.

Variable		Univariate		Multivariate
	n=61	5-year OS rate (%)	p value *	HR	95% CI	p value **
Gender
Male	52	64.6	0.538
Female	9	75
Age
<65 years	26	76	0.182
≥65 years	35	58.8
Tumor length
<50 cm	41	67.1	0.591
≥50 cm	20	64.3
Histological type
Well/Moderately	44	71.6	0.192
Poorly	17	52.9
Lymphatic invasion
Positive	32	57.9	0.099	2.51	0.921-7.374	0.0724
Negative	29	74.8
Venous invasion
Positive	32	52.5	0.045	3.203	1.206-9.175	0.0192
Negative	29	77.6
Pathological depth of the tumor
pT1	27	77.4	0.054	2.694	0.964-8.299	0.0589
pT2-3	34	56.6
Pathological lymph node metastasis
pN0	27	73.5	0.207
pN1-3	34	59.7
IHC score
≤ 0.1 or ≥ 0.9	29	44.8	0.001	10.31	3.542-35.70	<0.0001
Others	32	84.2

OS: overall survival; HR: hazard ratio; CI: confidence interval.

^* Log-rank test. ^** Cox’s proportional hazards model.