Prognostic factors of survival and a new scoring system for liver resection of colorectal liver metastasis

Table 1 Clinicopathological data of patients

Characteristic	Total (n = 98)
Age in yr, median (IQR)	65.5 (59-72)
Sex, n (%)
Male	62 (63.3)
Female	36 (36.7)
Location of primary colorectal tumor, n (%)
Right	26 (26.5)
Left	40 (40.8)
Rectum	32 (32.7)
LN involvement in primary tumor, n (%)
Yes	62 (63.3)
No	36 (36.7)
Time of diagnosis of liver metastasis, n (%)
Synchronous	59 (60.2)
Metachronous
Disease-free interval < 12 mo	9 (9.2)
Disease-free interval ≥ 12 mo	30 (30.6)
Synchronous extrahepatic metastasis, n (%)
Yes	4 (4.1)
No	94 (95.9)
Preoperative CEA level in ng/mL, n (%)
< 200	90 (91.8)
≥ 200	6 (6.1)
Systemic chemotherapy before liver resection, n (%)
Yes	9 (9.2)
No	89 (90.8)
Number of liver metastases, n (%)
< 5 lesions	91 (92.9)
≥ 5 lesions	7 (7.1)
Size of largest liver metastasis, n (%)
< 4 cm	67 (68.4)
≥ 4 cm	28 (28.6)
Surgical margin, n (%)
Positive	19 (19.4)
Negative	78 (79.6)
Concurrent ablation, n (%)
No	90 (91.8)
Yes	8 (8.2)
Operative approach, n (%)
Laparoscopic	57 (58.2)
Open	41 (41.8)
Type of hepatectomy, n (%)
Minor	61 (62.2)
Major	37 (37.8)
Intraoperative blood loss, n (%)
< 500 mL	49 (50.0)
≥ 500 mL	47 (48.0)
Requirement of blood transfusion, n (%)
No	79 (80.6)
Yes	19 (19.4)

CEA: Carcinoembryonic antigen; IQR: Interquartile range; LN: Lymph node.