Table 1.

Univariate analysis of prognostic factors

Risk factors	P value1
Sex (male vs female)	0.52
Age (yr)	0.39
Tumor differentiation (G1 and 2 vs G3)	0.71
History of previous liver metastasis (yes vs no)	0.04
Preoperative CEA levels (below vs above median)	0.04
Disease-free interval (mo)	0.42
Number of metastases (1 vs ≥ 2)	0.01
Location of metastasis (left vs others)	0.82
Type of resection (wedge vs others)	0.74
Hilar or mediastinal node resection (yes vs no)	0.51
Lung metastatic tumour size (mm)	0.43
Postoperative chemotherapy (yes vs no)	0.89

¹Calculated with univariate Cox regression. CEA: Carcinoembryonic antigen.