Table 3. Univariate analysis for disease-free survival and overall survival.

Parameter	DFS			OS
	HR	95% CI	P	HR	95% CI	P
Age (years)			0.153			0.029
<60	1			1
≥60	1.31	0.89–1.94		1.58	1.03–2.42
Gender			0.724			0.604
Male	1			1
Female	0.94	0.64–1.37		0.61	0.59–1.36
Tumor sites			0.732			0.580
Head	1			1
Body/tail	1.07	0.72–1.59		1.13	0.73–1.76
Tumor size			0.595			0.150
T1–2	1			1
T3–4	1.11	0.76–1.62		1.35	0.89–2.05
Lymph node metastasis			0.020			0.006
No	1			1
Yes	1.55	1.05–2.28		1.77	1.16–2.71
TNM stage			<0.001			<0.001
I-II	1			1
III	4.29	2.28–8.10		3.32	1.73–6.37
Resection margins			0.022			<0.001
Negative	1			1
Positive	1.64	1.05–2.56		2.24	1.28–3.89
Tumor differentiation			0.000			<0.001
Well/moderate	1			1
Poor	2.07	1.38–3.09		2.41	1.57–3.69
EGFR expression			0.493			0.161
Low	1			1
High	1.14	0.78–1.66		1.34	0.88–2.03
CXCR4 expression			0.003			<0.001
Low	1			1
High	1.78	1.20–2.64		2.41	1.54–3.76
EGFR/CXCR4 coexpression			<0.001	0.001		<0.001
Negative	1			1
Positive	2.35	1.51–3.67		3.16	1.96–5.09