Table 6. Mono-factor analysis of 5-year postoperative survival rate of patients with different pathological type.

	5-year postoperative survival rate of Squamous cell carcinomas	P	5-year postoperative survival rate of Adenocarcinoma	P
Age
≤60y	68.8%	0.584	70.6%	0.150
>60y	61.1%		47.8%
Gender
Male	66.7%	0.626	60.0%	0.680
Female	50.0%		53.3%
Tumor differentiation grade
Poorly differentiated	60.0%	0.091	46.2%	0.314
Middle-, high-differentiated	72.0%		63.0%
Diameter of tumor
≤4cm	66.7%	0.778	61.3%	0.368
>4cm	65.4%		44.4%
pTNM stage
I stage	75.0%	0.001	68.8%	0.342
II stage	82.4%		62.5%
III stage	11.1%		43.8%
Smoking status
Yes	66.7%	0.851	56.3%	0.896
No	63.6%		58.3%
The plasma level of HIF-1α
≤297.70 pg/ml	78.6%	0.034	47.1%	0.251
>297.70 pg/ml	50.0%		65.2%