| Chronology of occurrence of metastases | population | Frequency (%) | Cumulative frequency (%) |
| - <1 yr | 25 | 14 | 14 |
| - 12 years | 59 | 33.1 | 47.1 |
| - 23 years | 53 | 29.8 | 76.9 |
| - 34 years old | 12 | 6.8 | 83.7 |
| - 45 years old | 21 | 11.8 | 95.4 |
| - 5 - 6 years | 00 | 00 | 95.4 |
| - 6 - 7 years | 8 | 4.5 | 100 |
| Total | 178 | 100 |