Background
Women with a BRCA mutation have significantly elevated breast cancer risk which can be reduced by >90% with bilateral prophylactic mastectomies (BPMs). We sought to compare a cohort of BRCA mutation carriers choosing BPM versus breast surveillance to better elucidate factors that may impact decision making.
Methods
Women with a BRCA mutation were retrospectively identified from a prospectively maintained database. The surveillance cohort (n=313) consisted of women seen in a high-risk clinic between 2014–2016; the surgery cohort (n=142) consisted of women who underwent BPM between 2010–2016. Clinical and familial factors were compared between the groups.
Results
Women choosing BPM were more likely to have a BRCA1 than BRCA2 mutation compared to the surveillance group (57% vs 45%, p=0.02) and were less likely to have a personal history of ovarian cancer (10% vs 20%, p=0.01). Women undergoing BPM were more likely to be married (78% vs 62%, p=0.01), to have more children (median 2 vs 1, p<0.001), and to have undergone a prophylactic oophorectomy (61% vs 37%, p<0.001). Women choosing BPM had more first-degree relatives (63% vs 48%, p=0.01) or a sister (23% vs 14%, p=0.02) with a history of breast cancer and were more likely to have a family member with ovarian cancer under age 40 (9% vs 4%, p=0.03). There was no difference in the number of prior breast biopsies or history of atypia/LCIS.
Conclusion
The decision to undergo BPM appears multifactorial, with gene mutation, family history, and relationships appearing to have the strongest influence on decision making.