For Design 1: Randomization must be performed no longer than 12 weeks from day 1 of the last chemotherapy cycle after obtaining a post-chemotherapy LVEF ≥ 50. Study treatment must start no more than 14 days after randomization For Design 2: Randomization must be performed no longer than 6 weeks from day 1 of the last anthracycline-containing chemotherapy cycle after obtaining a post-anthracycline chemotherapy LVEF ≥ 50. Study treatment must start no more than 14 days after randomization and must be concurrent with taxanes.