Dalpiciclib combined with pyrotinib and endocrine therapy in women with ER-positive, HER2-positive advanced breast cancer: A prospective, multicenter, single-arm, phase 2 trial by Jian Zhang, Yanchun Meng, Biyun Wang, Xinhong Wu, Hongmei Zheng, Jing Hu, Wei Liu, Wenyan Chen, Leiping Wang, Jun Cao, Zhonghua Tao, Ting Li, Sujie Ni, Zhengyan Yu, Lichun Sun, Yun Wang, Qiang Peng, Song Wang, Xin Hu, Jianfei Wang, Yijia Wu, Xichun Hu

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