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Expression of p16 Ink4a in mixed squamous cell and glandular papilloma of the lung

Mixed squamous cell and glandular papilloma (mixed papilloma) of the lung is an extremely rare neoplasm, with only 21 cases reported in the English literature. Although the expression of p16 has been analyzed in only two cases of mixed papilloma, they were negative for p16 . Therefore, the significa...

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Published in:Pathology international 2017-06, Vol.67 (6), p.306-310
Main Authors: Miyoshi, Ryo, Menju, Toshi, Yoshizawa, Akihiko, Date, Hiroshi
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Language:English
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description Mixed squamous cell and glandular papilloma (mixed papilloma) of the lung is an extremely rare neoplasm, with only 21 cases reported in the English literature. Although the expression of p16 has been analyzed in only two cases of mixed papilloma, they were negative for p16 . Therefore, the significance of p16 overexpression in mixed papilloma remains unclear. This is the first case of mixed papilloma with positive p16 expression in a 72-year-old male smoker. The 20 mm sized tumor was histologically diagnosed as mixed papilloma following right upper lobectomy. Immunohistochemically, cytokeratin 5 and p40 positivity was predominant in basal cells of the glandular component and squamous cells, while thyroid transcription factor-1, p53, and Ki-67 were focally positive. Both glandular and squamous components were diffusely positive for p16 . This finding could be important to clarify the pathogenesis and biology of mixed papilloma.
doi_str_mv 10.1111/pin.12531
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subjects Aged
Biomarkers, Tumor - metabolism
Cyclin-Dependent Kinase Inhibitor p16 - metabolism
Epithelial Cells - metabolism
Epithelial Cells - pathology
Humans
Immunohistochemistry
Lung Neoplasms - diagnostic imaging
Lung Neoplasms - metabolism
Lung Neoplasms - pathology
Male
Papilloma - diagnostic imaging
Papilloma - metabolism
Papilloma - pathology
title Expression of p16 Ink4a in mixed squamous cell and glandular papilloma of the lung
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