| Staging | Frequency | Percent |
| IA | 2 | 8 |
| IB | 9 | 36 |
| IIA | 2 | 8 |
| IIB | 3 | 12 |
| III | 2 | 8 |
| IVA | 2 | 8 |
| IVB | 5 | 20 |
| Total | 25 | 100.0 |