A misperceived threat: Understanding the increasing mastectomy rates.

75 Background: Rates of unilateral (UM) and contralateral prophylactic mastectomy (CPM) for early-stage breast cancer (ESBC) have been increasing. Both surgeons’ preference and patients’ choice have been suggested to play a role. Methods: A qualitative study was conducted examining surgeon’s practices and patient’s decision-making during treatment for ESBC. The Health-Belief Model was applied identifying factors influential in the choice for UM+/-CPM. Purposive sampling identified non-high-risk women across Toronto, Canada who were candidates for breast conserving therapy (BCT) but underwent UM+/-CPM. Academic and community breast surgeons from across Ontario, Canada and the United States were also recruited. Data were collected through semi-structured interviews. Constant comparative analysis identified key ideas. Results: 29 patients and 45 surgeons were interviewed. The dominant theme was the ‘misperceived threat of ESBC: an overestimated risk’. Surgeons described the high survivability of ESBC, yet pa...