Factors influencing prophylactic surgical intervention in women with genetic predisposition for breast cancer.

Introduction: In the United States, 5%-10% of breast cancer cases are due to genetic predisposition. Among this population, prophylactic mastectomy is viable risk-reducing option.

Objective: The objective of this study is to understand the timing to prophylactic mastectomy in patients with genetic predisposition to breast cancer and uncover factors influencing this decision.

Methods: This study is a retrospective review of patients diagnosed with genetic predisposition for breast cancer from 2010 to 2020.

Results: In a cohort of 506 patients with genetic predisposition for breast cancer, 154 (30.4%) underwent prophylactic mastectomy, the remainder opted for surveillance alone. The median time from diagnosis to mastectomy was 1.1 years (IQR, 0.5-3.1 years). During the surveillance period, 118 patients (33.5%) underwent breast biopsy. Of the patients with benign or atypical findings, 35 (36.8%) pursued prophylactic mastectomy, a median of 0.5 years (IQR, 0.2-1.6 years) after their gene diagnosis. The most common factor impacting the decision to undergo prophylactic mastectomy was having a family member with cancer (54.7%) followed by a personal diagnosis of other cancer(s) (27.5%).

Conclusion: Understanding the factors influencing the decision to undergo prophylactic surgery will allow for more effective shared decision-making for primary care providers, breast surgeons, and reconstructive surgeons.