T-DM1 and Non-pegylated Liposomal Doxorubicin in Human Epidermal Growth Factor Receptor 2 (HER2)-Positive Metastatic Breast Cancer

"3 Cohorts (3+3 design):~Cohort 1- Trastuzumab 3.6 mg/kg IV on Day 1 every 3 weeks and non-pegylated liposomal doxorubicin (45 mg/m2) IV~Cohort 2- Trastuzumab 3.6 mg/kg IV on Day 1 every 3 weeks and non-pegylated liposomal doxorubicin (50 mg/m2) IV~Cohort 3- Trastuzumab 3.6 mg/kg IV on Day 1 every 3 weeks and non-pegylated liposomal doxorubicin (60 mg/m2) IV"