Table 4.

Cox multivariate analysis on PFS of the patients with esophageal cancer

Variable	Reference	HR	Wald χ2	P
Gender	Male	1.152	0.765	>0.05
Age	<55	1.638	1.369	>0.05
Smoking history	Never	1.337	0.923	>0.05
TNM staging	I~II	2.153	7.035	<0.05
Family history of carcinoma	Yes	1.381	1.755	>0.05
Degree of tumor differentiation	G3	0.627	5.335	<0.05
Lobes metastases	Yes	0.774	2.151	>0.05
Serum TK1 level	<3.38 pmol/L	1.632	4.887	<0.05