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. 2022 Nov 30;12:1003393. doi: 10.3389/fonc.2022.1003393

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Copyright © 2022 Wang, Wang, Wang, Yang, Guo, Ren, Mou, Jia and Song

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) Hematoxylin–eosin stain showing the mass consists of small round cells (hematoxylin-eosin, original magnification ×200). (B) Immunohistochemistry revealed extremely positive CD99 staining (× 200). (C) The fusion of EWSR1 with FLI1 was positively detected by FISH in tumor cells (yellow arrow) (× 1000).