Table 3.
Univariate analysis of prognostic factors for disease-free survival
| No. of patients | 3-y DFS rate | p | |
|---|---|---|---|
| Sex | |||
| Male | 219 | 77.0% | 0.136 |
| Female | 188 | 84.5% | |
| Age, y | |||
| <75 | 279 | 83.4% | <0.001 |
| ≥75 | 128 | 75.1% | |
| Preoperative CEA | |||
| <5 | 240 | 88.4% | <0.001 |
| ≥5 | 167 | 70.0% | |
| Postoperative CEA | |||
| <5 | 341 | 83.8% | <0.001 |
| ≥5 | 66 | 63.6% | |
| Tumor location | |||
| Right | 129 | 76.9% | 0.207 |
| Left | 157 | 80.7% | |
| Rectum | 121 | 85.1% | |
| Differentiation | |||
| Well | 26 | 86.8% | 0.627 |
| Moderately | 372 | 80.5% | |
| Poorly | 9 | 76.2% | |
| LVI | |||
| Yes | 208 | 73.0% | <0.001 |
| No | 199 | 88.4% | |
| PNI | |||
| Yes | 41 | 60.6% | <0.001 |
| No | 366 | 83.0% | |
| TNM stage | |||
| I | 125 | 94.6% | <0.001 |
| II | 146 | 84.3% | |
| III | 136 | 63.4% | |
| Smoking | |||
| Yes | 92 | 80.5% | 0.471 |
| No | 315 | 80.9% | |
| Diabetes | |||
| Yes | 112 | 81.0% | 0.720 |
| No | 295 | 81.1% | |
CEA = carcinoembryonic antigen; DFS = disease-free survival; LVI = lymphovascular invasion; PNI = perineural invasion; TNM = tumor-node-metastasis.