Cytokeratin (CK) 7 is normally expressed in the vast majority of lung adenocarcinoma (ADC). However, on rare occasions, as reported in this paper, CK7 negativity can challenge the diagnosis of pulmonary ADC. Hence, the need to use a combination of 'immunomarkers' such as thyroid transcription factor 1, Napsin A, p40, p63 and CK20.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10271213PMC
http://dx.doi.org/10.1093/jscr/rjad316DOI Listing

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