Table 6.

Univariate and Multivariate Overall Survival Analysis

Variable	Univariate (HR)	P	95% CI	Multivariate (HR)	P	95% CI
Tumor sidedness (left-sided)	0.18	.002	0.06-0.53	0.20	.004	0.07-0.59
KRAS (wild-type)	0.40	.020	0.18-0.86	0.51	.117	0.22-1.18
EGFR (negative)	0.43	.054	0.18-1.02	0.54	.182	0.22-1.34

HR: hazard ratio; CI: confidence interval; ERFR: epidermal growth factor receptor.