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. 2017 Jun 30;19:75. doi: 10.1186/s13058-017-0870-1

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — HRs of developing second primary tumors calculated from a multivariate Cox proportional hazards model. a Patients who underwent breast-conserving surgery. b Patients who underwent mastectomy. Shown are HRs, 95% CIs, and P values. n Total number of patients in each cohort, I Number of patients who received neodjuvant radiotherapy (RT) in each cohort, ER Estrogen receptor