 - Sub-study A MRI: In addition to the assessments performed in the primary study, patients undergo some extra tests. During initial visit, patients have an additional blood sample collected during initial visit for measurement of B-type natriuretic peptide BNP and troponin T and undergo cardiac MRI. Approximately 48 hours after the first dose of doxorubicin hydrochloride, patients undergo an additional visit, during which blood samples are collected for BNP and troponin T and an cardiac MRI is performed. 