Table 4.

Multivariate Cox regression analyses of risk factors for overall survival.

	Adjusted hazard ratio†	95% confidence interval	Adjusted p
Tumor stage			0.020
II vs. I	1.65	0.75–3.62
III vs. I	2.20	1.03–4.68
IV vs. I	4.12	1.58–10.77
Risk group			0.018
Moderate vs. Low	1.44	0.67–3.10
High vs. Low	2.32	1.10–4.90

^†Adjusted variables included gender, race, age, tumor location, histology classification, and differentiation grade.