Table 2. Multivariate Cox regression analysis of mortality.

Term		Risk Ratio	Lower 95%	Upper 95%	P value
HSP27 ratio >1		2.30	1.03	5.38	0.04*
Age		1.04	1.00	1.08	0.05
Tumor	2 vs.1	1.81	0.75	4.75	0.59
	3 vs.1	2.02	0.31	10.54
	4 vs.1	1.37	0.40	4.81
Node	1 vs.0	1.17	0.42	2.99	0.57
	2 vs.0	0.96	0.31	2.75
	3 vs.0	2.72	0.63	10.21
Metastasis		1.18	0.51	2.61	0.70
Cell type	SQ vs. AD	0.86	0.35	2.14	0.74
Gender	M vs. F	1.74	0.71	4.29	0.22

SQ: squamous cell carcinoma, AD: adenocarcinoma (*p<0.05).