Table 4B. Multivariate analysis of clinicopathological variables in relation to disease-free and overall survival.

	Disease-free survival			Overall survival
Factor	P	Hazard ratio	95% Cl	P	Hazard ratio	95% Cl
Neural infiltration (0 or 1)				0.033	0.197	0.044–0.876
Serosal invasion (+)	0.002	3.919	1.650–9.311
KRAS mutations in postoperative serum (post+)	0.027	2.919	1.109–5.612
Group 2 (pre−/post+)				0.004	9.419	2.015–44.036

Abbreviation: CI=confidence interval.