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. 2002 Jun 17;86(12):1884–1887. doi: 10.1038/sj.bjc.6600326

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Copyright © 2002 Cancer Research UK

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CK20 (A) and CK7 (B) immunostaining of primary lung adenocarcinoma. CK20 (C) and CK7 (D) immunostain of metastatic lung adenocarcinoma to the liver. Most of the tumour cells in both the primary and the metastatic lesion show strong cytoplasmic staining with CK7 and negative staining with CK20 (original magnification 200×).