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. 2021 Oct 19;11:666815. doi: 10.3389/fonc.2021.666815

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Copyright © 2021 Wong, Li and Cheung

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Photomicrographs of OCCC showing (A) tubulocystic pattern with tubules lined by hobnail, clear and eosinophilic cells (H&E). The carcinoma cells are immunoreactive for napsin A (B) and HNF-1β (C) but negative for estrogen receptor (D).