Table 4.

Multivariable analysis of locoregional control (LRC) and overall survival (OS) based on proposed lymph node assessment method

Variable	LRC		OS
	p	HR [95%CI]	p	HR [95%CI]
Age (> 65/≤65)			0.047	2.90 [1.01–8.30]
Immunosuppression	0.014	2.49 [1.86–8.28]	0.022	3.60 [1.20−10.82]
Tumor stage (T3−4 vs. T1−2)	0.006	2.30 [1.97–5.46]	0.017	3.96 [1.79–8.86]
Positive margin	< 0.001	29.39 [7.67–112.60]	< 0.001	22.50 [5.79–87.46]
Proposed stage
N1
N2	0.011	6.80 [1.55–29.95]	0.020	6.43 [1.35–30.67]
N3	< 0.001	20.12 [5.16–78.50]	< 0.001	13.89 [3.26–59.09]
Radiotherapy	0.099	0.89 [0.77–1.18]	0.087	0.94 [0.86–1.32]