Assessment of the Decision-making Impact of the Breast Cancer Index in Recommending Extended Adjuvant Endocrine Therapy for Patients With Early Stage ER-positive Breast Cancer

The investigators' objective is to assess patient decision-making, anxiety and patient
satisfaction with recommendations made by an oncologist before and after the BCI test
results are known. In addition, a chart review will be performed annually for five years to
assess disease status and medications. Specifically, if extended endocrine therapy was
recommended the chart review will record if participants are taking the medication and, if
not, why the treatment was discontinued.

Inclusion Criteria:

Each patient must meet all of the following criteria in order to be considered for
enrollment:

- Histologically confirmed ER positive, stage I-III breast cancer who have been treated
with curative intent and completed at least four years of adjuvant endocrine therapy.

- Life expectancy ≥ 5 years.

- Must be able to provide informed consent.

- Willing to consider continuation of endocrine therapy beyond 5 years.

Exclusion Criteria:

- A patient must not be enrolled if any contraindication exists for extended adjuvant
endocrine therapy as identified by the treating oncologist.