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. 2021 Feb 11;10:599604. doi: 10.3389/fonc.2020.599604

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Copyright © 2021 Wu, Han, Yu, Ouyang, Yan, Wang, Hu, Jiang, Huang, Tong, Wang, Yin, Li, Yang, Yang, Teng, Sun, Cai, Li, Chen, He, Liu, Yang, Qiao, Fan, Wang and Xu

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) First-line palliative treatment options for HR+ ABC patients (N = 1,847). (B) Second-line palliative treatment HR+ABC patients (N = 1,424). ET, endocrine therapy; CT, chemotherapy; TT, target therapy.