Τreatment Standards and Outcomes of Patients With ER/PR Positive, HER2-negative Metastatic Breast Cancer

* To capture the treatment patterns and clinical characteristics of patients with ER/PR positive, HER2-negative MBC in Greece * To evaluate the outcome of patients per treatment line (objective response, progression free survival, time to disease progression per line of therapy), overall survival * To record adverse events per line of therapy * To recording of the causes of treatment discontinuation per line of therapy