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. 2023 Apr 12;109(5):1330–1341. doi: 10.1097/JS9.0000000000000370

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Copyright © 2023 The Author(s). Published by Wolters Kluwer Health, Inc.

This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as the author is credited and the new creations are licensed under the identical terms. http://creativecommons.org/licenses/by-nc-sa/4.0/

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Relationship between the number of adjuvant chemotherapy drugs and overall survival in the stage II patients, stratified by HER2 expression. (A) Overall survival in stage II patients with a HER2 IHC score of 0; (B) overall survival in stage II patients with a HER2 immunohistochemistry (IHC) score of 1+; (C) overall survival in stage II patients with a HER2 IHC score of 2+; (D) overall survival in stage II patients with a HER2 IHC score of 3+. *Received single-agent chemotherapy versus no adjuvant chemotherapy; ^#Received multiagent chemotherapy versus no adjuvant chemotherapy. HER2, human epidermal growth factor receptor 2; HR, hazard ratio.