Proposal of criteria to select candidates with colorectal liver metastases for hepatic resection: Comparison of our scoring system to the positive number of risk factors

Table 1 Prognostic factors entered into multivariate analysis based on proposed clinical and histopathological features

Variable	n
Gender (male/female)	61/20
Age at hepatectomy(< 60/≥ 60 yr)	32/49
Chronology of hepatic metastasis
(synchronous/metachronous)	41/40
Disease free interval after colectomy
(synchronous or ≤ 1 yr/> 1 yr)	56/25
Extrahepatic distant metastases (no/yes)	9/72
CEA ( ≤ 10 times of normal value/> 10 times of normal value)	57/24
Primary lesion
Depth of invasion (up to subserosa/more)	57/24
Lymph node metastasis (no/yes)	39/42
Hepatic metastasis
Number (single / multiple)	45/36
Maximum diameter ( ≤ 5 cm/> 5 cm)	59/22
Lobe involved (unilobar/bilobar)	64/17
Therapeutic factor
Type of hepatectomy (limited/lobectomy)	56/25
Surgical margin (< 1 cm /≥ 1 cm)	61/20