Table 1 Patient demographics and the characteristics of the primary tumor(s)
| Â | Centrally located | Peripherally located | P values |
|---|---|---|---|
( n = 24) | ( n = 135) | ||
Gender | |||
 Male | 19 (79.2%) | 70 (51.9%) | 0.014 |
 Female | 5 (20.8%) | 65 (48.1%) |  |
Age (year) | 58.5 ± 2.4 (29–75) | 59.7 ± 1.0 (24–86) | 0.62 |
Location of the primary tumor(s) | |||
 Rectum | 13 (54.2%) | 56 (41.5%) | 0.541 |
 Sigmoid colon | 6 (25.0%) | 28 (20.7%) |  |
 Descending colon | 1 (4.2%) | 10 (7.4%) |  |
 Transverse colon | 3 (12.5%) | 15 (11.1%) |  |
 Ascending colon and cecum | 1 (4.2%) | 22 (16.3%) |  |
 Synchronousa | 0 (0.0%) | 4 (3.0%) |  |
Primary tumor staging | |||
 T1 or T2 | 2 (8.3%) | 6 (4.4%) | 0.437 |
 T3 | 7 (29.2%) | 56 (41.5%) |  |
 T4 | 15 (62.5%) | 73 (54.1%) |  |
Regional lymph node metastasis | |||
 N0 | 6 (25.0%) | 26 (19.3%) | 0.705 |
 N1 | 8 (33.3%) | 56 (41.5%) |  |
 N2 | 10 (41.7%) | 53 (39.3%) |  |
Primary extrahepatic metastasis | 6 (25.0%) | 12 (8.9%) | 0.033 |
Associated risky presentation(s)b | 5 (20.8%) | 16 (11.9%) | 0.321 |