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Patients with unilateral breast cancer have an increased risk of developing contralateral breast cancer. A recent population-based study demonstrated that the proportion of patients with unilateral breast cancer in the United States who underwent contralateral prophylactic mastectomy (CPM) has increased by 150% in recent years. The current study evaluated patients who underwent breast cancer surgery in a metropolitan-based hospital system to determine factors associated with CPM.

We reviewed the records of all patients who underwent surgical treatment for breast cancer in 2006 and 2007 in a single health care system, which included six different hospitals. Exclusion criteria included preoperative diagnosis of bilateral disease, stage IV disease, and a history of previous breast cancer. We recorded patient, treatment, tumor, and …