Table 4.

Survival analysis of patients with esophageal squamous cell carcinoma according to cyclooxygenase-2 protein expression levels.

	Cyclooxygenase-2 protein expression			P-value
	Negative	Low	High
1-year survival rate (%)	97.4	95.1	94.4
3-year survival rate (%)	81.6	61.3	46.7
5-year survival rate (%)	60.3	50.0	21.0
Median survival time (months)	94	68	36	0.001
1-year recurrence rate (%)	62.5	72.2	60.0
3-year recurrence rate (%)	37.5	11.1	0.0
5-year recurrence rate (%)	12.5	0.0	0.0
Median recurrence time (months)	20	20	16	0.05