This trial studies the acceptability and how well decision making tool works in supporting decision making in contralateral prophylactic mastectomy in patients with newly diagnosed breast cancer. Decision making tool may help patients with early stage breast cancer make decisions regarding their surgical options.

PRIMARY OBJECTIVES:

I. An online decision support tool will be field tested that provides patients facing a decision about contralateral prophylactic breast cancer (CPM) with evidence-based information about the expected incidence of contralateral breast cancer and the life expectancy benefit of CPM. The tool will be designed for use in clinical settings and viewed jointly by the patient and physician as part of a shared decision making process around CPM.

OUTLINE:

Patients use decision making tool during consultation with breast cancer surgeon and complete questionnaires before and after consultation.

Inclusion Criteria:

• Newly diagnosed ductal breast carcinoma in situ (DCIS) or stage I-III sporadic unilateral invasive breast cancer
• Able to speak read or write English

Exclusion Criteria:

• Patients with previous breast cancer
• Prior history of bilateral prophylactic mastectomy
• Known to have a germline mutation that predisposes them to an increased risk of breast cancer (e.g. BRCA1/2) and/or they are considered at high risk for contralateral breast cancer on the basis of a strong family history of cancer