Table 3. The multivariate analysis of prognostic factors weighed by Cox's proportional hazard model.

FOLFOX group		RR	95%CI	P Value	XELOX group		P Value
PFS	Age			0.32	PFS	Age	0.11
	Gender			0.64		Gender	0.71
	PS			0.56		PS	0.31
	PPI	0.67	1.10–2.05	0.01		PPI	0.52
OS	Age			0.17	OS	Age	0.31
	Gender			0.66		Gender	0.73
	PS			0.44		PS	0.81
	PPI	0.72	1.02–1.90	0.04		PPI	0.98

RR = relative risk, CI = confidence interval, PFS = progression-free survival, PS = performance status, PPI = proton pump inhibitor, OS = overall survival.