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. 2019 Mar 29;39:14. doi: 10.1186/s40880-019-0357-9

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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. 3 — Kaplan-Meier estimates of the survival of NPC patients with residual cervical lymphadenopathy. Of the 82 patients, 36 had detectable preoperative plasma EBV DNA, and 46 had undetectable preoperative plasma EBV DNA. a Progression-free survival; b overall survival; c distant metastasis-free survival; d locoregional relapse-free survival; e local relapse-free survival; and f regional relapse-free survival