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. 2019 Sep 13;39:49. doi: 10.1186/s40880-019-0394-4

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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. 5 — Kaplan–Meier OS curves of patients under different pN stages assigned to different subgroups. a pN0 patients in Subgroup 2 vs. pN1 patients in Subgroup 1, b pN1 patients in Subgroup 2 vs. pN2 patients in Subgroup 1, c pN2 patients in Subgroup 2 vs. pN3a patients in Subgroup 1. (Subgroup 1: patients with retrieval of Group 1 LNs > 13 or Group 2 LNs > 9; Subgroup 2: patients with retrieval of Group 1 LNs ≤ 13 and Group 2 LNs ≤ 9). OS overall survival, pN pathological lymph node classification