This study is being done to see if losartan affects the chances of developing radiation-induced heart failure in patients who are receiving radiation therapy as part of standard of care treatment for breast cancer. The interventions involved in this study are: * Losartan * Radiation Therapy (standard of care)
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AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Extracellular Volume (ECV) of Myocardial Fibrosis
Timeframe: 6 months