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. 2018 Nov 19;38:67. doi: 10.1186/s40880-018-0337-5

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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. 4 — Homogeneity in stage classifications using the 7th and 8th AJCC/UICC staging systems and the modified pTNM staging system for both the training and external validation cohorts. a–c Stages IIIA, IIIB, and IIIC classified according to the 7th edition, respectively; d–f stages IIIA, IIIB, and IIIC classified according to the 8th edition, respectively; g–i stages IIIA, IIIB, and IIIC classified according to the modified pTNM staging system, respectively. j–l Stages IIIA, IIIB, and IIIC classified according to the 7th edition, respectively; m–o stage IIIA, IIIB, and IIIC classified according to the 8th edition, respectively; p–r stage IIIA, IIIB, and IIIC classified according to the modified pTNM staging system, respectively. The homogeneity of the proposed modified pTNM staging system is higher, supporting by mild differences in survival curves, than those of the 7th and 8th AJCC/UICC staging systems