New classification for advanced breast cancer patients experiencing disease progression during salvage treatment: a single-center retrospective cohort study - Wen, Jiahuai; Ren, Liping; Li, Wenxia; Li, Junhong; Huang, Lezhen; Yuan, Zhongyu; Chen, Qianjun (Annals of Translational Medicine; Vol 10, No 10 (May 31, 2022): Annals of Translational Medicine, 2022)