| Mucosa | Invasive front | |||||
| (−) | (+) | p-value | (−) | (+) | p-value | |
| Histological type | ||||||
| Well/moderately differentiated | 5 | 10 | 0.034 | 8 | 7 | 0.062 |
| Poorly-differentiated | 15 | 5 | 17 | 3 | ||
| Lymphatic invasion | ||||||
| Negative | 9 | 7 | 0.807 | 9 | 7 | 0.132 |
| Positive | 11 | 8 | 16 | 3 | ||
| Venous invasion | ||||||
| Negative | 3 | 6 | 0.129 | 4 | 5 | 0.099 |
| Positive | 17 | 9 | 21 | 5 | ||
| Lymph node metastasis | ||||||
| N0 | 9 | 7 | 0.807 | 9 | 7 | 0.132 |
| N1, N2, N3 | 11 | 8 | 16 | 3 | ||
| Depth of tumor invasion | ||||||
| T1 | 3 | 8 | 0.027 | 5 | 6 | 0.057 |
| T2 ,T3, T4 | 17 | 7 | 20 | 4 | ||
| Stage | ||||||
| Ⅰ | 5 | 10 | 0.034 | 8 | 7 | 0.062 |
| II, III, IV | 15 | 5 | 17 | 3 | ||