PMID- 36719454 OWN - NLM STAT- MEDLINE DCOM- 20231129 LR - 20231205 IS - 1432-2307 (Electronic) IS - 0945-6317 (Linking) VI - 483 IP - 5 DP - 2023 Nov TI - A novel EWSR1-MYB fusion in an aggressive advanced breast adenoid cystic carcinoma with mixed classical and solid-basaloid components. PG - 717-722 LID - 10.1007/s00428-023-03500-1 [doi] AB - Breast adenoid cystic carcinoma (AdCC) with a solid-basaloid component is rare. The solid-basaloid component is usually characterized by solid nests composed of basal-like cells with marked nuclear atypia, high mitotic activity, and necrosis. Given the rarity of such tumors, information on their clinicopathological and genomic characteristics is limited. Herein, we report a case of advanced breast cancer with a poor prognosis with histological and immunohistochemical characteristics of AdCC with a solid-basaloid component. For the solid-basaloid component, fluorescence in situ hybridization (FISH) analysis revealed rearrangement of the EWSR1 and MYB genes, and immunohistochemical staining indicated MYB positivity. Next-generation sequencing-based technology revealed a novel EWSR1-MYB fusion. To our knowledge, this is the first report of an EWSR1-MYB fusion in AdCC with a solid-basaloid component and a poor prognosis. Our findings may extend the genetic understanding of AdCC and aid in the clinical diagnosis of AdCC. CI - (c) 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature. FAU - Lei, Ting AU - Lei T AD - Department of Pathology, The Third Affiliated Hospital of Soochow University, Ju Qian Street 185, Changzhou, 213003, Jiangsu, China. FAU - Shi, Yongqiang AU - Shi Y AD - Department of Pathology, The Third Affiliated Hospital of Soochow University, Ju Qian Street 185, Changzhou, 213003, Jiangsu, China. FAU - Da, Wenyue AU - Da W AD - Department of Pathology, The Third Affiliated Hospital of Soochow University, Ju Qian Street 185, Changzhou, 213003, Jiangsu, China. FAU - Xia, Cunyan AU - Xia C AD - Department of Pathology, The Third Affiliated Hospital of Soochow University, Ju Qian Street 185, Changzhou, 213003, Jiangsu, China. FAU - Wang, Hui AU - Wang H AUID- ORCID: 0000-0003-2278-9965 AD - Department of Pathology, The Third Affiliated Hospital of Soochow University, Ju Qian Street 185, Changzhou, 213003, Jiangsu, China. 3wang7hui@163.com. LA - eng GR - QN202114/Changzhou Science and Technology Bureau/ PT - Case Reports PT - Journal Article DEP - 20230131 PL - Germany TA - Virchows Arch JT - Virchows Archiv : an international journal of pathology JID - 9423843 RN - 0 (EWSR1 protein, human) RN - 0 (RNA-Binding Protein EWS) SB - IM MH - Female MH - Humans MH - Breast/pathology MH - *Breast Neoplasms/pathology MH - *Carcinoma, Adenoid Cystic/genetics/pathology MH - High-Throughput Nucleotide Sequencing MH - In Situ Hybridization, Fluorescence MH - RNA-Binding Protein EWS/genetics OTO - NOTNLM OT - Advanced breast adenoid cystic carcinoma OT - EWSR1-MYB OT - Solid-basaloid components EDAT- 2023/02/01 06:00 MHDA- 2023/11/27 12:43 CRDT- 2023/01/31 11:14 PHST- 2022/09/27 00:00 [received] PHST- 2023/01/22 00:00 [accepted] PHST- 2023/01/19 00:00 [revised] PHST- 2023/11/27 12:43 [medline] PHST- 2023/02/01 06:00 [pubmed] PHST- 2023/01/31 11:14 [entrez] AID - 10.1007/s00428-023-03500-1 [pii] AID - 10.1007/s00428-023-03500-1 [doi] PST - ppublish SO - Virchows Arch. 2023 Nov;483(5):717-722. doi: 10.1007/s00428-023-03500-1. Epub 2023 Jan 31.