Web-Based Decision Aid in Improving Informed Decisions in Patients With Stage 0-IIIA Breast Cancer Considering Contralateral Prophylactic Mastectomy

Inclusion Criteria: * PHASE I: Has a first, primary diagnosis of unilateral stage 0, 1, 2, or 3a breast cancer (patients with bilateral breast cancer will be excluded from participation) * PHASE I: Speaks and reads English * PHASE I: Women with sporadic cancers (WSC) (does not have hereditary breast/ovarian cancer syndrome \[BReast CAncer gene (BRCA) carrier, strong family history\]); if there is any uncertainty, the surgeon will use the Tyrer-Cuzick (Tyrer et al., 2004) risk model to calculate risk; the Tyrer-Cuzick model calculates a personal lifetime risk of breast cancer based on multiple factors; it has become the standard model because it incorporates not only factors such as estrogen exposure and first degree relatives, but also second degree relatives and paternal lineage; a lifetime risk of 20% or greater is considered high risk and would necessitate increased screening methods to the traditional annual mammogram; for this study, anyone with a lifetime risk up to 19% on the Tyrer-Cuzick model will be considered average risk for breast cancer; anyone with a lifetime risk of 20% or greater will be excluded from participation * PHASE I: Able to provide meaningful informed consent * PHASE II: Completed initial surgical consult with breast cancer surgeon at Cancer Institute of New Jersey (CINJ)/Massachusetts General Hospital (MGH)/Memorial Sloan Kettering Cancer Center (MSKCC) and is considering CPM, regardless of the surgical treatment of their primary breast cancer (lu…