6) Statistical Analysis The primary outcome will be global longitudinal strain measured by echocardiography. The secondary outcomes will be the NT-proBNP cardiac biomarker measured with an assay of blood taken via venous blood draw, and the other cardiac strain parameters, as well as standard systolic and diastolic echocardiographic parameters. The exploratory outcome will be signal-averaged electrocardiography. Outcome measures will be performed at the following time points: 1) Post diagnosis and >24 hours prior to the first cycle of anthracyclines; 2) 24-48 hours after the first cycle; 3) at least one week after the last cycle of anthracyclines, but before subsequent chemotherapy treatments.