Table 2.

Full and reduced multivariate analysis for OS

	Full Model			Reduced Model
	HR	95% CI for OS	p-value	HR	95% CI for OS	p-value
# positive LNs	1.06	(0.92, 1.23)	0.410
Age
<60 years
≥60 years	1.45	(0.54, 3.89)	0.463
Tumor grade
G1/G2
G3	7.50	(2.03, 27.72)	0.003	9.66	(3.14, 29.73)	<0.001
Residual Tumor Score
TRG2: Score:1–10
TRG3:Score:11–50	1.30	(0.37, 4.65)	0.682
TRG4:Score>50	3.32	(0.63, 17.52)	0.158
Margin
Free
Involved Margins	36.61	(2.08, 645.913)	0.014	81.66	(6.58, 1012.637)	0.001