2. Anthracycline resistance is defined as tumor progression during treatment or within 3 months of last dose in the metastatic setting, or recurrence within 6 months in the neoadjuvant or adjuvant setting. Alternatively, a minimum cumulative dose of anthracycline of 240 mg/m^2 (doxorubicin) or 360 mg/m^2 (epirubicin) has been reached, or there is contraindication to use anthracycline, the patient is also eligible