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. 2018 Jul 28;18:186. doi: 10.1186/s12886-018-0850-y

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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. 2 — Kaplan-Meier survival analysis for each group: (a) Overall survival (OS) for patients with VA ≥20/400 versus VA < 20/400 (b) OS for patients with tumor size ≤20 mm versus tumor size > 20 mm. (c) OS for patients with no distant metastasis, regional nodal metastasis versus distant metastasis. (d) OS for patients with or without recurrent disease