Stress Test in Detecting Heart Damage in Premenopausal Women With Stage I-III Breast Cancer

Inclusion Criteria: * Women who were premenopausal at the time of breast cancer diagnosis; (premenopausal is defined as per National Comprehensive Cancer Network (NCCN) criteria * Breast cancer treatment is within three years of initiating anti-estrogen therapy and includes medically or surgically induced menopause (HR-positive tumor) or three years of completing chemotherapy (HR-negative tumor) * Diagnosed with stage I-III breast cancer OR with metastatic breast cancer and receiving ovarian suppression function and aromatase inhibitors as their first non-chemotherapy regimen in the metastatic setting (can include CDK inhibitor with aromatase inhibitor) * Eastern Cooperative Oncology Group (ECOG) performance status of 0-2 * Ability to understand and the willingness to sign an Institutional Review Board (IRB)-approved informed consent document (either directly or via a legally authorized representative) Exclusion Criteria: * Women with human epidermal growth factor-2 (HER2) positive breast cancer would be excluded from this pilot given the confounding issue of the cardiotoxicity associated with HER2-directed therapies. * History of allergic reactions attributed to compounds of similar chemical or biologic composition to adenosine (or regadenoson for those with history of asthma or chronic obstructive pulmonary disease \[COPD\]) * Those with contraindications for MRI such as some breast expanders, ferromagnetic cerebral aneurysm clips or other intracranial metal, pacemakers, defibrillators, functioning neurostimulator devices or other implanted electronic devices * Uncontrolled intercurrent illness including, but not limited to ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations that would limit compliance with study requirements * Pregnant women are excluded from this study; a pregnancy test is required, unless the patient has undergone either a bilateral oophorectomy, hysterectomy or both * Coronary revascularization in the past 6 months or known severe multi-vessel coronary artery disease (CAD) previously determined to be not amenable to mechanical intervention * Ongoing, unrelieved symptoms thought to represent cardiac ischemia and requiring immediate cardiac catheterization