Understanding BRCA Mutations and Breast Cancer

The Connection Between BRCA Mutations and Breast Cancer

A notable percentage of breast cancers are linked to BRCA mutations. As a preventive measure, many women choose to undergo radical and invasive surgeries. A research team in the UK investigated whether young breast cancer patients with a BRCA mutation could delay these preventative procedures.

BRCA mutations occur in either the breast cancer type 1 or type 2 susceptibility protein (BRCA1/BRCA2). These proteins play a crucial role in repairing damaged DNA. When they fail to repair DNA effectively, the cell is signaled for destruction. Consequently, mutations in these genes hinder DNA repair and increase the risk of developing breast cancer. Currently, between 5-10% of breast cancers are associated with a BRCA mutation.

Impact of BRCA Mutations on Health Decisions

Women carrying a BRCA mutation face a significantly elevated risk of breast cancer. However, it is important to note that possessing a BRCA mutation does not guarantee cancer development. Various preventative surgeries, including mastectomies, can lower cancer risk for women with these mutations. While radical mastectomies are often the preferred option, research has not definitively established the necessity of this surgery.

A recent study published in the Lancet Oncology and reviewed by BMJ Research News sought to determine if women with the BRCA mutation needed to rush into radical surgeries. This cohort study involved 2,733 women aged 40 or younger at the time of their breast cancer diagnosis. The researchers analyzed the DNA of participants and discovered that 12% had a BRCA mutation. The women received standard treatments, including chemotherapy, breast-conserving surgery, and mastectomy.

Study Findings on Survival Rates

A follow-up conducted two years later revealed that the overall survival rate for women with a BRCA mutation (97%) was comparable to that of women without the mutation (96.6%). These findings were consistent at five-year (83.8% vs 85%) and ten-year (73.4% vs 70.1%) follow-ups. Notably, women with a BRCA mutation and triple-negative breast cancer exhibited a slight survival advantage over their non-BRCA counterparts. However, researchers concluded that this advantage was not attributable to radical surgery, and the underlying reasons remain unclear. Additionally, the study found no correlation between double mastectomy and improved survival rates.

Rethinking Double Mastectomies for BRCA Mutation Carriers

Study Conclusions and Recommendations

The research indicated that undergoing a double mastectomy is not mandatory for women with a BRCA mutation, particularly for those diagnosed with breast cancer at a young age. The study emphasized that this radical surgery does not need to be performed immediately, allowing women to explore other treatment options before deciding on surgery. This finding empowers young women with a BRCA mutation and a breast cancer diagnosis to consider their choices carefully, potentially leading to better long-term survival rates.

References

(1) Copson, E., Maishman, T., Tapper, W. 2018. Germline BRCA mutation and outcome in young-onset breast cancer (POSH): a prospective cohort study. Lancet Oncol. doi:10.1016/S1470-2045(17)30891-4.
(2) Wise, J. 2018. Young women with BRCA mutation can safely postpone radical surgery. BMJ Research News. doi: 10.1136/bmj.k180