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. 2016 Jul 7;16:410. doi: 10.1186/s12885-016-2462-3

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© The Author(s). 2016

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. 1 — Schematic illustration of tissue sample collection. Samples without follow-up in this study were collected accordingly: tumour tissue (inside tumour), tumour-proximal non-malignant tissue (PN, within 2 cm from tumour) and distant non-malignant tissue (DN, over 5 cm away from tumour)