Table 4.

Univariate and Multivariate analysis of PFS.

Variable	Univariable Cox regression			Multivariable Cox regression
	HR	95%CI	P	HR	95%CI	P
Age(≤55/>55)	0.616	0.306-1.240	0.174
Gender(Male/Female)	0.939	0.443-1.990	0.869
Distant metastasis(Yes/No)	2.697	1.298-5.603	0.008	3.128	1.457-6.715	0.003
Tumor location(Head/Tail or Body)	2.103	0.901-1.4.908	0.086	2.715	1.135-6.493	0.025
Regimen(GS/GS+A)	2.64	1.265-5.511	0.01	2.553	1.207-5.401	0.014