Table 4.

Risk factors affecting 1-year disease free survival and 2-year overall survival rate determined by Cox regression analysis

Variables	PFS		OS
	HR (95%CI)	P	HR (95%CI)	P
ERCC1 expression
Low vs High	0.27 (0.12-0.61)	0.001	0.31 (0.13-0.75)	0.010
Betel nuts
Never vs Used	NE	0.647	0.35 (0.13-0.98)	0.045

CI, confidence interval; HR, Hazard ratio