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. 2014 Dec 24;9(3):1373–1379. doi: 10.3892/ol.2014.2830

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Copyright © 2015, Spandidos Publications

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(A) Cancer tissue revealing the atypical nest and mesh shape of the cell arrangement (stain, hematoxylin and eosin; magnification, ×100). The positive immunohistochemical staining for (B) TTF-1 and (C) CK-7 indicates that the cancer originated from the lung. (D) HE staining of the gastric mass tissues (magnification, ×100). The cancer tissue exhibits similar HE morphology to lung adenocarcinoma, and there are clear boundaries between the cancer tissue and the normal gastric gland. Positive immunohistochemical staining for (E) TTF-1 and (F) CK-7 which is the same result as found in lung adenocarcinoma. TTF-1, thyroid transcription factor-1; CK, cytokeratin; HE, hematoxylin and eosin.