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. 2018 Jun 26;38:39. doi: 10.1186/s40880-018-0310-3

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© The Author(s) 2018

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. 1 — Kaplan-Meier overall survival estimates of patients ≤ 40 years old vs. those of patients > 40 years old. The hazard ratio of overall survival in the group older than 40 was 1.27 (P = 0.198) compared to the younger age group. 95% CI 95% confidence interval. Luminal: estrogen receptor (ER) or progesterone receptor (ER) positive breast cancers, HER2: HER2 amplified or over-expressed breast cancers and Basal: Triple negative breast cancers