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. 2019 Oct 28;17:173. doi: 10.1186/s12957-019-1718-1

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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. 2 — Kaplan-Meier curves comparing the recurrence-free survival of the patients according to the four parameters independently associated with the risk of recurrence after curative surgery. a Distal margin (log-rank = < 10^− 3). b Extracapsular invasion of lymph node metastasis (log-rank = 0.015). c Tumor stenosis (log-rank = 0.016). d Parietal invasion according to the TNM classification (log-rank = 0.016)