| Basic characteristics | Number of patients (%) |
| Age (mean ± SD) (yr) | 71.7 ± 8.2 |
| Gender | |
| Male | 24 (68.6) |
| Female | 11 (31.4) |
| Histological type | |
| Well/moderately differentiated | 15 (42.9) |
| Poorly-differentiated | 20 (57.1) |
| Lymphatic invasion | |
| Negative | 16 (45.7) |
| Positive | 19 (54.3) |
| Venous invasion | |
| Negative | 9 (25.7) |
| Positive | 26 (74.3) |
| Lymph node metastasis | |
| N0 | 16 (45.7) |
| N1 | 8 (22.9) |
| N2 | 1 (2.9) |
| N3 | 10 (28.6) |
| Depth of tumor invasion | |
| T1 | 11 (31.4) |
| T2 | 4 (11.4) |
| T3 | 8 (22.9) |
| T4 | 12 (34.3) |
| Stage | |
| I | 15 (42.9) |
| II | 6 (17.1) |
| III | 7 (20.0) |
| IV | 7 (20.0) |