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. 2023 Jan 20;14:1071899. doi: 10.3389/fendo.2023.1071899

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Copyright © 2023 Keidai, Murakami, Yamamura, Tsunoda, Ikeda, Hida, Nagao, Yamada, Fukui, Ogura, Fukuda, Nakamoto, Obama and Inagaki

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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(A) Macroscopic view of resected tumors. T1–11 represent tumor #1–11. (B–G) Microscopic findings of the representative resected tumor. (B, C) Hematoxylin and eosin staining showed that the tumor was composed of spindle to ovoid cells forming the patternless pattern. Immunohistochemical stains of tumor #10 show tumor cells to be positive for (D) signal transducer and activator of transcription 6 (STAT6), (E) IGF2, (F) somatostatin receptor 2 (SSTR2) and negative for (G) SSTR5. Scale bar: 50 μm.