TABLE 2.

Univariate analysis of predictive factors of treatment failure within 1 year

	Univariate analysis
	HR (95% CI)	p-Value
Age, years	0.99 (0.98–1.01)	0.35
Male sex	0.82 (0.56–1.19)	0.29
Primary tumor
Rectum	–	–
Left colon	1.02 (0.63–1.70)	0.93
Right colon	1.50 (0.88–2.59)	0.14
Primary tumor T stage
T1–T2	–	–
T3–T4	1.91 (1.12–3.41)	0.023
Primary tumor N stage
N0	–	–
N?	2.29 (1.54–3.44)	< 0.001
Disease-free interval, months	0.98 (0.97–0.99)	< 0.001
Number of metastases	1.17 (1.07–1.28)	< 0.001
Metastases size, cm	1.08 (1.02–1.14	0.007
Preoperative CEA, ng/mL
≤200	–	–
>200	1.43 (0.70–2.80)	0.31

Statistically significant values given in bold

CEA carcinoembryonic antigen, HR hazard ratio, CI confidence interval