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JOURNAL ARTICLE

Unique expression profiles of mucin proteins in interstitial pneumonia-associated lung adenocarcinomas

Toshiaki Kataoka, Koji Okudela, Yu Nakashima, Hideaki Mitsui, Mai Matsumura, Shigeaki Umeda, Hiromasa Arai, Tomohisa Baba, Takehisa Suzuki, Chihiro Koike, Yoko Tateishi, Michihiko Tajiri, Tamiko Takemura, Takashi Ogura, Munetaka Masuda, Kenichi Ohashi
Histology and Histopathology 2019 April 9, : 18114
30964151
In order to clarify idiopathic interstitial pneumonia (IIP)-associated lung adenocarcinoma (LADC), we herein focused on the expression profiles of mucin proteins, the most common cellular differentiation markers. The expression of the mucin (MUC) 1, MUC2, MUC3B, MUC4, MUC5AC, MUC5B, MUC6, MUC7, MUC9, and MUC21 proteins was examined immunohistochemically and their levels were semi-quantified in 80 IIP-associated LADCs and 106 non-IIP LADCs. LADCs were divided into low and high expressers based on thresholds obtained from the receiver operating characteristic (ROC) curves of each mucin protein. Low expressers of MUC1, MUC7, and MUC21 and high expressers of MUC4, MUC5AC, MUC5B, and MUC9 were dominant in the IIP group. Multivariate analyses confirmed that the correlations between mucin expression profiles and IIP-associated LADCs were independent of putative confounding factors, such as smoking, gender, histological types, and cytological types. Thus, the expression profiles of these mucin proteins significantly differed between the IIP and non-IIP groups. IIP-associated LADCs appear to have unique cellular differentiation features and they may develop through a distinct histogenetic pathway. This is the first study to demonstrate that IIP-associated LADCs have unique mucin expression profiles.

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