Lisinopril or Coreg CR® in Reducing Side Effects in Women With Breast Cancer Receiving Trastuzumab

OBJECTIVES: Primary * The primary objective of this study is to determine if administration of lisinopril or Coreg CR®, compared to placebo, will reduce the incidence of trastuzumab-induced cardiotoxicity, as measured by LVEF, in patients receiving adjuvant, or neoadjuvant,therapy for HER2 positive breast cancer. Secondary * To determine whether subjects randomized to active agent have fewer interruptions in trastuzumab therapy due to cardiomyopathy. * To determine whether the treatment effect is consistent in anthracycline and nonanthracycline patient cohorts * To compare changes in HRQL among the treatment groups during the study intervention * To evaluate the long term effects on the prevention of cardiomyopathy and impact on HRQL for either or both study agents * To compare the predictive value of troponin I and BNP in the identification of trastuzumab-induced cardiotoxicity OUTLINE: This is a multicenter study. Patients are stratified according to chemotherapy comprising an anthracycline (yes vs no). Patients are randomized to 1 of 3 treatment arms. * Arm I: Patients receive oral lisinopril once daily. * Arm II: Patients receive oral Coreg CR® once daily. * Arm III: Patients receive oral placebo once daily. In all arms, study treatment begins with the first dose of trastuzumab and continues for up to 52 weeks or until the end of trastuzumab therapy. Quality of life is assessed using the EORTC QLQ-C30 questionnaire at baseline, at 52 weeks (or at the end of trastuzumab therapy), and at 18 and 24 months (or 6 and 12 months after the completion of trastuzumab). After completion of study treatment, patients are followed up at 3, 6, 9, and 12 months.