研究单位：[1]Cancer Institute and Hospital,Chinese Academy of Medical Sciences[2]The 307th Hospital of Military Medical Sciences Beijing,China[3]Sichuan Cancer Hospital and Institute Chengdu,China[4]The First Affliated Hospital of Chongqing Medical University Chongqing,China[5]FuZhou General Hospital of National Miltary Command Fuzhou,China[6]Sun Yat-Sen University Cancer Center Guangzhou,China[7]Harbin Medical University Cancer Hospital Harbin,China[8]Henan Cancer Hospital Henan,China[9]Hunan Cancer Hospital Hunan,China[10]Jiangsu Provinces hospital Jiangsu,China[11]Tumor Hospital of Yunnan Province Kunming,China[12]Liaoning Cancer Hospital,Zhejiang Cancer Hospital Liaoning,China[13]General Hospital of NingXia Medical University Ningxia,China[14]Fudan University Shanghai Cancer Center Shanghai,China[15]The First Hospital of China Medical University Shenyang,China[16]Tianjin Medical University Cancer Institute & Hospital Tianjin,China[17]Wuhan Union Hospital Wuhan,China[18]The First Hospital of Xi'an Jiaotong University Xi'an,China[19]Xinjiang Medical University Cancer Hospital Xinjiang,China[20]FuJian Provincial Cancer Hospital Zhengzhou,China
研究目的：
To study the epidemiological trends and characteristics for advanced breast cancer patients, to analyze these trends and report the results
