Patterns of Care in Hormone-receptor Positive, Advanced Breast Cancer

Inclusion Criteria: * Histological or cytological diagnosis of breast cancer * Postmenopausal status at the time of enrolment, according to the following definitions: * History of bilateral oophorectomy at any age * Proven hormonal menopause * Positive estrogen receptor (ER) and/or progesterone receptor (PR) by immuno * Failure of one previous endocrine therapy in the adjuvant or metastatic setting * Use of no more than one previous chemotherapy regimen in the neoadjuvant or adjuvant setting * Indication to receive chemotherapy or endocrine therapy Exclusion Criteria: * Inability to comply with the study protocol * Use of more than one previous endocrine therapy, regardless of the setting; -- Previous use of chemotherapy for metastatic disease * Use of neoadjuvant endocrine therapy as the only previous type of endocrine therapy * Serious medical, surgical or psychiatric comorbidity that, upon investigator's discretion, should preclude participation in the study.