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. 2017 May 25;15:105. doi: 10.1186/s12957-017-1172-x

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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 — PTK7 is upregulated in esophageal squamous cell carcinoma tumors. a Oncomine expression analysis of PTK7 in human esophageal squamous cell carcinoma tumors vs. normal esophageal tissues. b IHC staining for PTK7 in clinical esophageal squamous cell carcinoma tumors and adjacent normal tissues. The table tabulates the statistics of the negative (−), positive (+), and strong staining (++) of PTK7 in the tumors and the normal tissues. A χ²test was performed to confirm the correlation of positive PTK7 staining with the tumor samples (χ² = 166.318, df = 2, p < 0.001)