Assessing early changes in plasma HER2 levels is useful for predicting therapeutic response in advanced breast cancer: A multicenter, prospective, noninterventional clinical study oleh Yi‐Kun Kang, Yi‐Ran Si, Jie Ju, Zhu‐Qing Jia, Nan‐Lin Hu, Hao Dong, Xue Wang, Jian Yue, Pei‐Di Jiang, Zhao‐Liang Li, Yun‐Yun Zhang, Yan Wang, Bing‐He Xu, Peng Yuan