Table 1. Patients' characteristics.
| Clinicopathological variables | N | % | |
|---|---|---|---|
| Sex | Male | 83 | 65.4 |
| Female | 44 | 34.6 | |
| Age (years) | ≤60 | 62 | 48.8 |
| >60 | 65 | 51.2 | |
| Maximum Size (cm) | ≤5 | 80 | 63.0 |
| >5 | 47 | 37.0 | |
| Gross Shape | Ulcerative type | 83 | 65.4 |
| Protruded type | 38 | 29.9 | |
| Infiltrative type | 6 | 4.7 | |
| Locationa | Left-sided | 56 | 44.1 |
| Right-sided | 71 | 55.9 | |
| Differentiation | G1-G2 | 78 | 61.4 |
| G3-G4 | 49 | 38.6 | |
| Mucinous or signet-ring carcinoma | No | 102 | 80.3 |
| Yes | 25 | 19.7 | |
| Serum CEA level | Normal | 78 | 61.4 |
| Elevated | 49 | 38.6 | |
| Serum CA199 level | Normal | 86 | 67.7 |
| Elevated | 41 | 32.3 | |
| Tumor stage (T) | T1 | 0 | 0.0 |
| T2 | 17 | 13.4 | |
| T3 | 36 | 28.3 | |
| T4a | 65 | 51.2 | |
| T4b | 9 | 7.1 | |
| Nodal status (N) | N0 | 68 | 53.5 |
| N1a | 5 | 3.9 | |
| N1b | 20 | 15.7 | |
| N1c | 10 | 7.9 | |
| N2a | 8 | 6.3 | |
| N2b | 16 | 12.6 | |
| Distant metastases (M) | M0 | 94 | 74.0 |
| M1 | 33 | 26.0 | |
| AJCC stage | I | 16 | 12.6 |
| II | 45 | 35.4 | |
| III | 33 | 26.0 | |
| IV | 33 | 26.0 | |
| Lymphovascular invasion | No | 85 | 66.9 |
| Yes | 42 | 33.1 | |
| Perineural invasion | No | 109 | 85.8 |
| Yes | 18 | 85.8 | |
| Extranodal tumor deposits | No | 108 | 85.0 |
| Yes | 19 | 15.0 |
a
The left side of the colon consists of the splenic flexure, descending, and sigmoid colon. The right side of the colon consists of the cecum, ascending colon, hepatic flexure, and transverse colon.
Abbreviations: CEA, carcinoembryonic antigen; CA199, Carbohydrate antigen 199; AJCC, American Joint Committee on Cancer.