Decision Making Tool in Supporting Decision Making in Contralateral Prophylactic Mastectomy in Patients With Newly Diagnosed Breast Cancer

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