Cardiac Outcomes With Near-Complete Estrogen Deprivation

Primary Objective: To determine the 24-month difference in stress myocardial blood flow during adenosine stress cardiovascular magnetic resonance imaging (CMR) in premenopausal women treated with near complete estrogen deprivation for high-risk hormone receptor-positive breast cancer and in premenopausal women treated without near complete estrogen deprivation for hormone receptor-negative breast cancer. Secondary Objectives: * To determine the 12-month difference in stress myocardial blood flow during adenosine stress cardiovascular magnetic resonance imaging (CMR) in premenopausal women treated with near complete estrogen deprivation for high-risk hormone receptor-positive breast cancer and in premenopausal women treated without near complete estrogen deprivation for hormone receptor-negative breast cancer. * To determine the 12-month and 24-month difference in aortic stiffness (thoracic pulse wave velocity and distensibility) with CMR in premenopausal women treated with an near complete estrogen deprivation for high-risk hormone receptor-positive breast cancer and in premenopausal women treated without near complete estrogen deprivation for hormone-receptor-negative breast cancer. * To determine the association of stress CMR myocardial blood flow with total coronary plaque burden from coronary computed tomography angiography (at baseline and 24 month difference) and difference in variability in these measures in premenopausal women treated with near complete estrogen deprivation for high-risk hormone receptor-positive breast cancer and in premenopausal women treated without near complete estrogen deprivation for hormone receptor- negative breast cancer. * To determine the 12-month and 24-month difference in myocardial perfusion reserve in premenopausal women treated with near complete estrogen deprivation for high-risk hormone receptor-positive breast cancer and in premenopausal women treated without near complete estrogen deprivation for hormone-receptor-negative breast cancer. * To develop predictive models to identify women at highest risk for developing deficits in myocardial blood flow in premenopausal women treated with near complete estrogen deprivation for high-risk hormone receptor-positive breast cancer. * To monitor disease outcomes, in particular invasive-breast cancer free survival and to assess if any changes in anti-neoplastic therapy occur on the basis cardiovascular diagnoses generally or specifically due to CROWN study results.