Table 2.

Multivariate analysis for five-year recurrence-free survival (RFS)

Variables	Univariate Cox,P	Multivariate Cox, HR (95% CI)	P
Age	0.233
Sex	0.517
Smoking history	0.428
Tumor size	0.079	2.974 (0.798 to 11.078)	0.104
LVI	0.016	2.100 (0.930 to 4.741)	0.074
Histological grading	0.362
Subtype grouping	0.008	2.815 (1.239 to 6.397)	0.013

Abbreviations: CI confidence interval, HR hazard ratio, LVI lymphovascular invasion.