Table 3.

Multivariate Cox regression analysis of disease-specific survival

Variables	Learning cohort			Validation cohort
	HR	95% CI	P	HR	95% CI	P
NS1-BP expression	2.229	0.929–3.996	0.019	2.518	1.085–5.226	0.010
CRT response	3.271	1.485–7.207	0.003	3.958	1.386–7.667	0.008
N category	1.233	0.586–2.595	0.581	1.663	0.562–3.893	0.329
M category	1.595	0.946–2.691	0.080	1.331	0.667–2.433	0.039

ESCC esophageal squamous cell carcinoma, DSS disease-specific survival, HR hazard ratio, CI confidence interval