Docetaxel, carboplatin and trastuzumab (TCH) and doxorubicin/cyclophosphamide followed by docetaxel/trastuzumab (AC-TH) produce superior disease-free survival (DFS) compared to AC-T in patients (pts) with HER-2 positive early breast cancer (EBC), with increased cardiac toxicity confined to AC-TH: BCIRG 006 study