Abstract:
:Insulinoma-associated protein 1 (INSM1) is an important biomarker of Achaete-scute homolog-like 1-driven pathways. For diagnosis of pancreatic neuroendocrine tumors (PanNET), chromogranin A (CGA), synaptophysin (SYP), and neural cell adhesion molecule (NCAM) were also considered as potential biomarkers. However, it is often difficult to diagnose it immunohistochemically. Hence, we examined the expression pattern of INSM1 in pancreatic solid tumors. We detected INSM1, CGA, SYP, and NCAM immunohistochemically, in 27 cases of NET [pure type: 25 cases, mixed adenoneuroendocrine carcinoma (MANEC): 2 cases]. We included 5 cases of solid-pseudopapillary neoplasm (SPN), 7 cases of acinar cell carcinoma (ACC), and 15 cases of pancreatic ductal adenocarcinoma (PDAC) as the control group. Nuclear expression of INSM1 was found in all PanNET pure type cases. However, expression of INSM1 was negative in PDAC, ACC, and SPN in all cases, whereas faint expression was seen in the cytoplasm from SPN. MANEC comprises of two components: neuroendocrine carcinoma and adenocarcinoma components. The NET component was positive for INSM1 expression, whereas the PDAC component does not express INSM1, which aids in distinguishing these components. Our results suggest that INSM1 is a useful immunohistochemical marker for diagnosing pancreatic neuroendocrine tumor.
journal_name
Med Mol Morpholjournal_title
Medical molecular morphologyauthors
Tanigawa M,Nakayama M,Taira T,Hattori S,Mihara Y,Kondo R,Kusano H,Nakamura K,Abe Y,Ishida Y,Okabe Y,Hisaka T,Okuda K,Fujino K,Ito T,Kawahara A,Naito Y,Yamaguchi R,Akiba J,Akagi Y,Yano Hdoi
10.1007/s00795-017-0167-6subject
Has Abstractpub_date
2018-03-01 00:00:00pages
32-40issue
1eissn
1860-1480issn
1860-1499pii
10.1007/s00795-017-0167-6journal_volume
51pub_type
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