Table 2. Comparison of the oophorectomy and control groups for ovarian and breast cancer incidence and death.
| Oophorectomy group | Screened group | |
|---|---|---|
| Number | 300 | 503 |
| Number BRCA1/2 carriers | 160 | 160 |
| Number MMR carriers | 1 | 12 |
| Ovarian cancer in follow-up | 0 | 15 |
| Stage of ovarian cancers | — | 2 in stage 1, 3 in stage 2, 9 in stage 3, 1 in stage 4 |
| Ovarian cancer death | 1 | 6 |
| Breast cancer death (diagnosed after start date)a | 7 (1)a | 6 (1)a |
| (6) Other non-breast/ovarian cancer deaths | 0 | 4 |
| Breast cancer diagnosed after start date | 14 | 13 |
| Breast cancer diagnosed before start date | 66 | 56 |
Abbreviation: MMR, mismatch repair mutation carriers.
a
Only one breast cancer death per group was attributable to a breast cancer occurring after commencement of follow-up in either BSO or screening group.