Table 3. Univariate Cox regression analysis of the parameters on patients’ survival.

Patients’ characteristics	HR	95% CI	P values
Gender	2.27	0.531–9.698	0.269
Age (years)	0.549	0.220–1.601	0.303
Tumor type	1.132	0.334–3.844	0.841
Tumor location	1.136	0.252–5.123	0.865
Differentiation	1.315	0.380–4.549	0.665
Length of tumor	0.646	0.283–1.475	0.299
p-T stage	2.781	1.109–6.971	0.029
p-N stage	1.883	1.209–2.931	0.005
p-TNM stage	2.793	1.345–5.798	0.006
EGFR gene copy number	1.612	0.707–3.679	0.251

HR, hazard ratio; EGFR, epidermal growth factor receptor; TNM, tumor, node, metastases.