Table 1. Clinicopathologic features of patients involved in this study.
| Characteristics | Total (n=310), n (%) |
|---|---|
| Age (years) | |
| ≤59 | 161 (51.9) |
| >59 | 149 (48.1) |
| Sex | |
| Female | 118 (38.1) |
| Male | 192 (61.9) |
| Primary tumor site | |
| Colon | 203 (65.5) |
| Rectum | 107 (34.5) |
| Primary tumor size (cm) | |
| ≤4.5 | 169 (54.5) |
| >4.5 | 141 (45.5) |
| T category | |
| 1 | 8 (2.6) |
| 2 | 52 (16.8) |
| 3 | 96 (31.0) |
| 4 | 154 (49.7) |
| N category | |
| 0 | 141 (45.5) |
| 1 | 118 (38.1) |
| 2 | 51 (16.5) |
| M category | |
| 0 | 170 (54.8) |
| 1 | 140 (45.2) |
| TNM stage | |
| II | 101 (32.6) |
| III | 69 (22.2) |
| IV | 140 (45.2) |
| Histological grade | |
| Well/moderate | 260 (83.9) |
| Poor | 50 (16.1) |
| CEA level (ng/mL) | |
| ≤5 | 128 (41.3) |
| >5 | 174 (56.1) |
| Not available | 8 (2.6) |
| CA19-9 level (U/mL) | |
| ≤35 | 211 (68.1) |
| >35 | 87 (28.1) |
| Not available | 12 (3.9) |
CEA, carcinoembryonic antigen before primary tumor resection; CA19-9, cancer antigen 19-9 before primary tumor resection.