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Numbers of familial breast cancers in sisters by morphology
| Sister 2 | |||||
| Sister 1 | Ductal | Lobular | Tubuloductal | Other | All |
| Ductal | 39 | 8 | 4 | 7 | 58 |
| Lobular | 6 | 2 | 1 | 4 | 13 |
| Tubuloductal | 11 | 1 | 0 | 1 | 13 |
| Other | 10 | 3 | 1 | 2 | 16 |
| All | 66 | 14 | 6 | 14 | 100 |
Kappa value for all types 0.002.
