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. 2019 Jun 8;19:554. doi: 10.1186/s12885-019-5774-2

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© The Author(s). 2019

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 curves illustrate the survival of patients treated with IMRT. Conventional-volume intensity-modulated radiation therapy (blue line) and reduced-volume intensity-modulated radiation therapy (red line), including (a) overall survival, (b) progression-free survival, (c) distant metastasis-free survival, (d) local recurrence-free survival, (e) regional recurrence-free survival and (f) locoregional recurrence-free survival