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This study investigated the immunohistochemical reactivity of the INSM1 antibody in 20 normal canine neuroendocrine tissues from various anatomical locations, 87 hyperplastic or neoplastic tissues of neuroendocrine origin, and 62 non-neuroendocrine neoplasms and compared the results with those of chromogranin A and synaptophysin in neuroendocrine neoplasms. Western blot was performed on fresh canine pituitary glands and canine parathyroid glands to confirm the specificity of the anti-INSM1 antibody. The results showed that the anti-INSM1 antibody could detect nuclear expression in normal canine neuroendocrine tissues, except for the parathyroid glands. INSM1 was detectable in 79\/87 (91%) of the hyperplastic and neoplastic neuroendocrine lesions, but all parathyroid carcinomas and parathyroid adenomas (three samples each) were negative for INSM1. In contrast, INSM1 was detected in only one of 62 (2%) non-neuroendocrine neoplasms. The overall percentage of neuroendocrine neoplasms that immunolabeled positively for all three markers was 89%. In addition, the nuclear expression of INSM1 was easier to interpret than that of chromogranin A or synaptophysin. These findings confirm that INSM1 is a useful immunohistochemical marker for diagnosing canine neuroendocrine neoplasms, except for parathyroid neoplasms, and should be considered as part of immunohistochemistry panels to improve diagnostic capability.<\/jats:p>","DOI":"10.1177\/03009858241279127","type":"journal-article","created":{"date-parts":[[2024,9,30]],"date-time":"2024-09-30T07:50:58Z","timestamp":1727682658000},"page":"178-186","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":4,"title":["Insulinoma-associated protein 1 (INSM1) immunohistochemical expression in normal, hyperplastic, and neoplastic canine neuroendocrine tissues"],"prefix":"10.1177","volume":"62","author":[{"given":"Fu-Hua","family":"Yang","sequence":"first","affiliation":[{"name":"National Taiwan University, Taipei"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ya-Pei","family":"Chang","sequence":"additional","affiliation":[{"name":"National Taiwan University, Taipei"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yen-Chen","family":"Chang","sequence":"additional","affiliation":[{"name":"National Taiwan University, Taipei"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8877-1886","authenticated-orcid":false,"given":"Hui-Wen","family":"Chang","sequence":"additional","affiliation":[{"name":"National Taiwan University, Taipei"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chian-Ren","family":"Jeng","sequence":"additional","affiliation":[{"name":"National Taiwan University, Taipei"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jia-Wei","family":"Jiang","sequence":"additional","affiliation":[{"name":"HOPE Veterinary Pathology Diagnostic Center, New Taipei City"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wen-Tien","family":"Tsao","sequence":"additional","affiliation":[{"name":"HOPE Veterinary Pathology Diagnostic Center, New Taipei City"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"I-Chi","family":"Luo","sequence":"additional","affiliation":[{"name":"HOPE Veterinary Pathology Diagnostic Center, New Taipei City"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0098-0278","authenticated-orcid":false,"given":"Wei-Hsiang","family":"Huang","sequence":"additional","affiliation":[{"name":"National Taiwan University, Taipei"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2024,9,30]]},"reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1177\/03009858231177225"},{"key":"e_1_3_2_3_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1939-1676.1997.tb00464.x"},{"key":"e_1_3_2_4_2","doi-asserted-by":"publisher","DOI":"10.1210\/en.2010-1065"},{"key":"e_1_3_2_5_2","doi-asserted-by":"publisher","DOI":"10.1038\/s41598-020-68507-z"},{"key":"e_1_3_2_6_2","first-page":"5393","article-title":"INSM1 is the best marker for the diagnosis of neuroendocrine tumors: comparison with CGA, SYP and CD56","volume":"10","author":"Fujino K","year":"2017","unstructured":"Fujino K, Yasufuku K, Kudoh S, et al. 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