Table 5.

Univariate and Multivariate Analyses for Overall Survival

Prognostic Factor	Group	OS (%)	Univariate	Multivariate	RR	95% CI
Age (years)	< 57	63	0.247	−
	≥ 57	48
Duke stage	A or B	68	0.297	−
	C	53
Rectal lateral margin	negative	59	0.078	0.029	2.2	1.1-4.5
	positive	37
Initial CEA (ng/ml)	< 100	59	0.081	0.47	1.3	0.6-2.7
	≥ 100	33
Liver resection	no	27	0.000	0.0	2.3	0.2-0.6
	yes	76
Adjuvant pelvic RT	no	49	0.224	-
	yes	70

Abbreviations: CEA = carcinoembryonic antigen; OS = overall survival; RR = relative risk; CI = confidence interval