Table 4.

Predictive Factors of Overall Survival and Disease-Free Survival in Univariate and Multivariate Analysis

Factor	Overall Survival (OS)				Disease-Free Survival (DFS)
	Univariate		Multivariate		Univariate		Multivariate
	P value	HR (95% CI)	P value	HR (95% CI)	P value	HR (95% CI)	P value	HR (95% CI)
Treatment modality (PORT vs POCRT)	0.024	0.634 (0.428–0.941)	0.015	0.609 (0.408–0.910)	0.017	0.638 (0.441–0.924)	0.010	0.609 (0.418–0.887)
Age (≤57 vs >57)	0.704	1.079 (0.730–1.594)	–		0.381	1.178 (0.817–1.698)	–
Sex (Female vs male)	0.231	0.682 (0.364–1.276)	–		0.268	0.728 (0.415–1.276)	–
ECOG PS (0–1 vs 2)	0.611	0.883 (0.546–1.428)	–		0.553	0.873 (0.557–1.368)	–
pT Stage (T1–2 vs 3–4)	<0.001	5.089 (2.957–8.757)	0.030	2.323 (1.085–4.973)	<0.001	5.260 (3.203–8.639)	0.002	3.124 (1.499–6.511)
pN Stage (N0 vs N+)	0.001	2.556 (1.475–4.428)	0.050	1.875 (1.000–3.516)	0.003	2.037 (1.268–3.274)	0.036	1.835 (1.041–3.236)
Differentiation (Well vs Fairly + Poorly)	0.002	3.068 (1.487–6.331)	0.012	2.550 (1.231–5.283)	0.001	3.320 (1.676–6.576)	0.003	2.891 (1.451–5.761)
Tumor Location (Upper vs middle + lower)	0.020	0.604 (0.395–0.922)	0.831	0.953 (0.615–1.479)	0.025	0.629 (0.419–0.945)	0.946	1.015 (0.665–1.549)
Clinical Stage (II vs III)	<0.001	7.181 (4.163–12.402)	0.003	3.292 (1.495–7.248)	<0.001	5.836 (3.665–9.293)	0.022	2.295 (1.128–4.671)