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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 patients greatly overestimated the threat of death from their cancer and strived to eliminate this threat by choosing UM+/-CPM. Surgeons described BCT and UM as equivalent treatment options for ESBC, and recommended BCT. In this average-risk population CPM was discouraged by the surgeons describing no survival advantage; despite this, women requested UM+CPM. Personal cancer experiences with family and friends were extremely influential in women’s request for UM+/-CPM. Previous negative experiences translated into an overestimated risk of recurrence, contralateral cancer, metastasisand subsequent death. Patients’ misperceived the severity of ESBC, and believed that by choosing UM+/-CPM they would live longer. Most women did not perceive any risks of undergoing mastectomy, yet many had ongoing issues with skin sensation, cosmesis and body image. Conclusions: Despite surgeons counseling otherwise, women greatly overestimated the risk of ESBC and misperceived the benefits of mastectomy. As undergoing UM+/-CPM is not without risks, improved discussion of patient sources of information and fears around survival may benefit surgical consultations, facilitating informed decision-making.
