| Tumour size (TNM classification) | Positive BS | Negative BS | Questionable BS | Total |
| T1 | 0 | 1 | 0 | 1 |
| T2 | 3 | 1 | 0 | 4 |
| T3 | 12 | 18 | 2 | 22 |
| T4 | 44 | 62 | 9 | 115 |
| Total | 59 | 72 | 11 | 142 |