In this study, the investigators conducted a hospital-based retrospective clinical study, recruiting female advanced breast cancer patients from 14 tertiary hospitals at 7 classic geographic regions, to study the clinical epidemiologic characteristics of advanced breast cancer and the current standard of clinical diagnosis and treatment in order to provide references for standardized treatment therapy, and to improve the quality of life and prolong survival time.~To study the epidemiological trends and characteristics for advanced BC patients, to analyze these trends and report the results. To learn about the current treatment therapy for advanced BC patients in different areas in China.To provide references for standardized treatment therapy, to improve the quality of patients' life and to prolong the survival time for the advanced BC patients.To assess the different treatment therapies for advanced BC with consideration of economic cost-effectiveness
To study the epidemiological trends and characteristics for advanced breast cancer patients, to analyze these trends and report the results