Table 2 Background characteristics of the matched cohorts
Variable |  | RFA (n = 62) | Repeat hepatic resection (n = 31) | χ2 | P | v |
|---|---|---|---|---|---|---|
Sex ratio (n) | Male:Female | 41:21:00 | 18:13 | 1.36 | 0.244 | 1 |
Age(years) | ≤ 60 | 30 (48.4) | 14 (45.2) | 0.206 | 0.65 | 1 |
> 60 | 32 (51.6) | 17(54.8) | ||||
Primary tumor location (n%) | Colon | 37 (59.7) | 19 (61.3) | 0.054 | 0.817 | 1 |
Rectum | 25 (40.3) | 12 (38.7) | ||||
Timing of liver metastases (n%) | Synchronous | 47 (75.8) | 22 (71.0) | 0.59 | 0.442 | 1 |
Metachronous | 15 (24.2) | 9 (29.0) | ||||
Distribution of liver metastases (n%) | Unilobar | 37 (59.7) | 20 (64.5) | 0.489 | 0.484 | 1 |
Bilobar | 25 (40.3) | 11 (35.5) | ||||
Preoperative chemotherapy (n%) | Â | 24 (38.7) | 11 (35.5) | 0.219 | 0.639 | 1 |
CEA (ng/ml) | ≤ 10 | 39 (62.9) | 20 (64.5) | 0.055 | 0.814 | 1 |
> 10 | 23 (37.1) | 11 (35.5) | ||||
Size of tumors (cm) | ≤ 3 | 45 (72.6) | 21 (67.7) | 0.573 | 0.449 | 1 |
> 3 | 17 (27.4) | 10 (32.3) | ||||
Number of metastatic tumors (n%) | Solitary | 31 (50.0) | 17 (54.8) | 0.462 | 0.497 | 1 |
Multiple | 31 (50.0) | 14 (45.2) | ||||
Relapse time interval (months) | ≤ 6 | 22 (35.5) | 10 (32.2) | 0.238 | 0.625 | 1 |
> 6 | 40 (64.5) | 21 (67.7) |