Table 1. Cox’s Proportional Hazards Analysis.

Factors	Relative Risk (95% confidence interval)	p
Symptoms (positive/negative)	1.408(0.284−86.983)	0.676
ALP(≦94 g/dl/>94g/dl)	1.167(0.496−2.750)	0.723
Tumor size (>5 cm/≦5 cm)	1.851(0.888−3.857)	0.100
Margin(positive/negative)	3.569(1.622−7.856)	0.002
Serum CEA (>5 ng/dl/≦5 ng/dl)	0.687(0.327−1.444)	0.322
COX2 expression(high/low)	10.373(3.992−26.956)	<0.001

ALP: alkaline phosphatase; CEA: carcinoembryonal antigen.