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Significant prognostic factors by multivariate analysis
| Variable | HR | 95%CI | P value |
| Serum CEA (< 2.5 ng/mL ≥ 2.5 ng/mL) | 1.68 | 1.05-2.66 | 0.027 |
| Lymph node metastasis (yes vs no) | 2.27 | 1.24-4.12 | 0.007 |
| Receiving adjuvant chemotherapy (yes vs no) | 0.71 | 0.49-1.02 | 0.067 |
| Surgical margin (negative vs positive) | 0.72 | 0.49-1.06 | 0.094 |
CEA: Carcinoembryonic antigen; HR: Hazard ratio.
