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| Features | Value |
|---|---|
| Mean age (years) | 55.9 |
| Sex (male/female) | 29/11 |
| Tumor size (cm) | 9.0±5.0 |
| Tumor location | |
| Middle | 12 |
| Lower | 22 |
| Whole | 6 |
| Histologic type | |
| Well differentiated | 7 |
| Poorly differentiated | 33 |
| Depth of invasion | |
| T4a | 18 |
| T4b | 22 |
| Lymph node involvement | |
| Negative | 11 |
| Positive | 29 |
| TNM stage | |
| II | 5 |
| III | 35 |
| Lymphatic invasion | |
| Yes | 30 |
| No | 10 |
| Vascular invasion | |
| Yes | 9 |
| No | 31 |
