Background & Aims: Xenin is a 25-amino acid peptide produced by specific endocrine cells of the duodenal mucosa. We investigated whether xenin is expressed in neuroendocrine tumors.
Methods: Seventy-two foregut and midgut neuroendocrine tumors were examined by means of immunohistochemistry, confocal laser microscopy with an antibody against the C-terminus of xenin, and high-pressure liquid chromatography after acidic extraction, assessed by radioimmunoassay.
Results: We found xenin-immunoreactive cells in 23 of 26 duodenal neuroendocrine tumors, including gastrinomas, somatostatinomas, and nonfunctioning and enterochromaffin cell tumors. In these tumors, up to 20% of the endocrine cells were xenin immunoreactive, and xenin immunoreactivity was concentrated in secretory granules. Xenin was coexpressed with chromogranin A. We found no xenin expression in gastrin-, somatostatin-, and serotonin-immunoreactive cells. High-pressure liquid chromatography after acidic extraction revealed 497 +/- 285 pmol of xenin per gram of tissue in 5 duodenal gastrinomas. The other neuroendocrine tumors, such as bronchial carcinoids, gastric enterochromaffin-like cell carcinoids, gastric and ileal enterochromaffin cell carcinoids, insulinomas, and gastrinomas of pancreatic origin, did not contain immunoreactive xenin.
Conclusions: Xenin is a peptide marker specific to neuroendocrine tumors of the duodenum. This finding may be useful in tumor classification and in the differential diagnosis of neuroendocrine tumors of the upper gut.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1053/gast.2002.36590 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Prognostic factors and outcomes of adjuvant and first-line metastatic treatments in melanoma a Turkish oncology group study.
Sci Rep
January 2025
Division of Medical Oncology, Marmara University School of Medicine, Istanbul, Turkey.
Management of melanoma has changed significantly with the discovery of targeted therapies and immune checkpoint inhibitors (ICI). Our aim in the study is to determine which treatment alternatives, specifically dabrafenib plus trametinib and ICIs, are effective in adjuvant therapy and which treatment is effective as first-line metastatic therapy. This retrospective, multicenter study included 120 patients diagnosed with stage IIIB-IIID melanoma receiving both adjuvant and first-line metastatic treatment between 2007 and 2023.
View Article and Find Full Text PDF[Clinicopathological analysis of primary gastric oncocytic neuroendocrine tumors].
Zhonghua Bing Li Xue Za Zhi
February 2025
Departmen of Pathology, Jiangsu Province (Suqian) Hospital/Suqian First Hospital, Suqian 223800, China.
[Advances in the pathology of digestive system diseases in China over the past ten years: retrospect and prospect].
Zhonghua Bing Li Xue Za Zhi
February 2025
Department of Pathology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, China.
The incidence of digestive system diseases is high. So digestive system pathology is widely concerned. In the past 10 years, Chinese pathologists insist on hard work and have made significant progress.
View Article and Find Full Text PDFClinical presentation of pheochromocytoma and screening recommendations.
Rev Clin Esp (Barc)
January 2025
Servicio de Endocrinología y Nutrición, Hospital Universitario Ramón y Cajal, Madrid, Spain; Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), Madrid, Spain. Electronic address:
Pheochromocytomas are neuroendocrine tumors that derive from sympathetic adrenomedullary chromaffin tissue and produce catecholamines. Due to the excess release of catecholamines, they can produce arterial hypertension, tachycardia, sweating, headache and a large number of other clinical manifestations secondary to the stimulation of α and β adrenoreceptors. Screening for pheochromocytoma is recommended in patients with paroxysmal, resistant or early-onset arterial hypertension, in cases with symptoms suggestive of catecholamine hypersecretion, patients with hereditary syndromes associated with pheochromocytomas, diabetes mellitus of atypical presentation and in adrenal incidentalomas with radiological characteristics not typical of adenoma (with > 10 Hounsfield Units on non-contrast CT).
View Article and Find Full Text PDFNovel Surgical Initiatives in Gastroenteropancreatic Neuroendocrine Tumours.
Curr Oncol Rep
January 2025
Department of General, Visceral and Thoracic Surgery, University Medical Center Hamburg- Eppendorf, Martinistraße 52, D-20246, Hamburg, Germany.
Purpose Of Review: Neuroendocrine tumours (NET) are rare entities arising from hormone producing cells in the gastroentero-pancreatic (GEP) tract. Surgery is the most common treatment of GEP-NETs.
Recent Findings: Improvements in surgical techniques allow for more locally advanced and metastasised GEP-NETs to be resected.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!