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. 2017 Nov 23;12:98. doi: 10.1186/s13019-017-0668-3

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© The Author(s). 2017

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 — Case 1. PET-CT showing the high fluorodeoyglucose (FDG) uptake of the primary lesion and swelling of the #2 (a) and #4 lymph nodes (b) before gefitinib therapy. PET-CT showing the regression of the primary lesion and the #2 (c) and #4 (d) lymph nodes after gefitinib therapy. Histological findings (hematoxylin-eosin staining) showing residual viable tumor cells in the primary lesion (e-f)