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Number of pieces and time to recurrence
| No of pieces | Time to recurrence (average months) |
| 1 piece but unclear margin (6 cases) | 6.0 ± 1.4 |
| 2 pieces (5 cases) | 9.0 ± 3.8 |
| 3 pieces (7 cases) | 10.1 ± 6.3 |
| 4 pieces (1 case) | 5 |
| ≥ 5 pieces (12 cases) | 3.8 ± 1.9 |
