Table 3.

Multivariate Cox regression analysis of disease-free survival (DFS) and overall survival (OS)

	Overall survival		Disease-free survival
	HR (95% CI)	P value	HR (95% CI)	P value
Histological grade	1.804 (1.282 to 2.540)	0.062	1.301 (1.060 to 1.597)	0.012
Tumor stage	1.191 (0.797 to 1.778)	0.394	1.178 (0.790 to 1.758)	0.422
Lymph node status	2.028 (1.529 to 2.688)	<0.0001	1.888 (1.423 to 2.504)	<0.0001
EGFR expression	1.804 (1.282 to 2.504)	0.001	1.681 (1.192 to 2.369)	0.003
Tumor size (length)	1.331 (1.090 to 1.625)	0.005	1.334 (1.093 to 1.627)	0.005

HR, hazard ratio; CI, confidence interval; EGFR, epidermal growth factor receptor.