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Pancreatic neuroendocrine tumors

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https://www.readbyqxmd.com/read/28535439/critical-focus-on-mechanisms-of-resistance-and-toxicity-of-m-tor-inhibitors-in-pancreatic-neuroendocrine-tumors
#1
REVIEW
L Antonuzzo, M Del Re, V Barucca, F Spada, G Meoni, G Restante, R Danesi, F Di Costanzo, N Fazio
Pancreatic neuroendocrine tumors (pNETs) are rare neoplasms representing less than 2% of all pancreatic malignancies. The PI3K-AKT-mTOR pathway is often deregulated in pNETs and seems to play a key role in tumorigenesis. Everolimus, an inhibitor of the mTOR pathway, has demonstrated efficacy in the treatment of pNETs. Nevertheless de novo or acquired drug resistance is responsible for disease progression and represents a major obstacle to overcome by clinicians. Blocking the PI3K/AKT/mTOR pathway may cover the supposed main mechanisms of resistance to everolimus...
May 11, 2017: Cancer Treatment Reviews
https://www.readbyqxmd.com/read/28533666/comparison-of-imaging-based-and-pathological-dimensions-in-pancreatic-neuroendocrine-tumors
#2
Salvatore Paiella, Harmony Impellizzeri, Elisabetta Zanolin, Giovanni Marchegiani, Marco Miotto, Anna Malpaga, Riccardo De Robertis, Mirko D'Onofrio, Borislav Rusev, Paola Capelli, Sara Cingarlini, Giovanni Butturini, Maria Vittoria Davì, Antonio Amodio, Claudio Bassi, Aldo Scarpa, Roberto Salvia, Luca Landoni
AIM: To establish the ability of magnetic resonance (MR) and computer tomography (CT) to predict pathologic dimensions of pancreatic neuroendocrine tumors (PanNET) in a caseload of a tertiary referral center. METHODS: Patients submitted to surgery for PanNET at the Surgical Unit of the Pancreas Institute with at least 1 preoperative imaging examination (MR or CT scan) from January 2005 to December 2015 were included and data retrospectively collected. Exclusion criteria were: multifocal lesions, genetic syndromes, microadenomas or mixed tumors, metastatic disease and neoadjuvant therapy...
May 7, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28530019/men1-in-children-and-adolescents-data-from-patients-of-a-regional-referral-center-for-hereditary-endocrine-tumors
#3
Letizia Vannucci, Francesca Marini, Francesca Giusti, Simone Ciuffi, Francesco Tonelli, Maria Luisa Brandi
PURPOSE: To retrospectively evaluate the age of onset of MEN1-associated lesions in a group of affected children and adolescents and to compare the clinical features of our series with the evidence derived from the literature. METHODS: The study population consisted of 22 Italian children and adolescents (age 6-31 years at the time of the inclusion in this study) all with a clinical and/or a genetic diagnosis of MEN1 performed before the age of 16 who have been followed-up regularly from 1998 to 2016 at the Regional Referral Center for Hereditary Endocrine Tumors...
May 22, 2017: Endocrine
https://www.readbyqxmd.com/read/28529726/pancreatic-neuroendocrine-tumors-the-basics-the-gray-zone-and-the-target
#4
REVIEW
Dionysia Kelgiorgi, Christos Dervenis
Pancreatic neuroendocrine tumors (PanNETs) manifest with a range of symptoms and pose a therapeutic challenge. A team approach, in which many specialists come together, is necessary in the quest for the best patient-tailored treatment. Disciplines such as oncology, surgery, basic science, endocrinology, radiology, and nuclear medicine need to work side by side, equally contributing to patient care and to advancing our better understanding of this fascinating disease.
2017: F1000Research
https://www.readbyqxmd.com/read/28529632/imaging-of-chemokine-receptor-4-expression-in-neuroendocrine-tumors-a-triple-tracer-comparative-approach
#5
Rudolf A Werner, Alexander Weich, Takahiro Higuchi, Jan S Schmid, Andreas Schirbel, Michael Lassmann, Vanessa Wild, Martina Rudelius, Theodor Kudlich, Ken Herrmann, Michael Scheurlen, Andreas K Buck, Saskia Kropf, Hans-Jürgen Wester, Constantin Lapa
C-X-C motif chemokine receptor 4 (CXCR4) and somatostatin receptors (SSTR) are overexpressed in gastro-entero-pancreatic neuroendocrine tumors (GEP-NET). In this study, we aimed to elucidate the feasibility of non-invasive CXCR4 positron emission tomography/computed tomography (PET/CT) imaging in GEP-NET patients using [(68)Ga]Pentixafor in comparison to (68)Ga-DOTA-D-Phe-Tyr3-octreotide ([(68)Ga]DOTATOC) and (18)F-fluorodeoxyglucose ([(18)F]FDG). Twelve patients with histologically proven GEP-NET (3xG1, 4xG2, 5xG3) underwent [(68)Ga]DOTATOC, [(18)F]FDG, and [(68)Ga]Pentixafor PET/CT for staging and planning of the therapeutic management...
2017: Theranostics
https://www.readbyqxmd.com/read/28526880/prognostic-relevance-of-uch-l1-and-%C3%AE-internexin-in-pancreatic-neuroendocrine-tumors
#6
Yu-Li Song, Run Yu, Xin-Wei Qiao, Chun-Mei Bai, Chong-Mei Lu, Yu Xiao, Ding-Rong Zhong, Jie Chen, Yu-Pei Zhao, Tai-Ping Zhang, Tian-Tian Song, He-Li Gao, Ying-Hua Wan, Lin Shen, Jie Chen, Bin Lv, Jian-Jiang Hao, Ye Zhang, Laura Tang, Yuan-Jia Chen
Prognostic biomarkers for the pancreatic neuroendocrine tumors are needed. Proteomic study on insulinoma has been rarely reported. We identified the differential expression of proteins between insulinoma and their paired tissues by proteomic analysis, and evaluated the prognostic significance of specific proteins in pancreatic neuroendocrine tumors including insulinoma. The differential expression of select proteins was validated in more than 300 tumors using immunohistochemical staining and western blot. Methylation of UCH-L1 promoter in tumors was examined by methylation specific PCR and validated by sequencing...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28521422/clinical-outcomes-and-prognostic-factors-of-resected-pancreatic-neuroendocrine-neoplasms-a-single-center-experience-in-china
#7
Kaizhou Jin, Guopei Luo, Jin Xu, Bo Zhang, Chen Liu, Shunrong Ji, Liang Liu, Jiang Long, Quanxing Ni, Xianjun Yu
The aim of the present study was to investigate the clinical, pathological and prognostic characteristics of Chinese patients with resected pancreatic neuroendocrine neoplasms (p-NENs). Data from patients who were surgically treated and pathologically diagnosed with p-NENs at the Department of Pancreatic Oncology of the Fudan University Shanghai Cancer Center (Shanghai, China), between January 2003 and July 2015, were evaluated using univariate and multivariate analyses. A total of 162 patients with p-NENs met the criteria of the present study and were included in the analysis...
May 2017: Oncology Letters
https://www.readbyqxmd.com/read/28515932/single-stage-laparoscopic-adrenalectomy-for-pheochromocytoma-and-enucleation-of-a-pancreatic-neuroendocrine-tumor-in-von-hippel-lindau-disease-a-case-report
#8
Marco Casaccia, Simona Macina, Rosario Fornaro
Von Hippel-Lindau (VHL) disease is an inherited syndrome with autosomal-dominant transmission, characterized by central nervous system and retinal hemangioblastomas, visceral cysts and tumors. Optimal surgical treatment, including its timing, remains a controversial topic. The present study reports the case of a 67-year-old female patient with adrenal and pancreatic manifestations of VHL. A laparoscopic cortex-sparing left adrenalectomy for a 4-cm pheochromocytoma and pancreatic enucleation for pancreatic polypeptidoma of the pancreas tail were performed during the same operative procedure...
May 2017: Molecular and Clinical Oncology
https://www.readbyqxmd.com/read/28510792/a-systematic-review-of-proinsulin-secreting-pancreatic-neuroendocrine-tumors
#9
Timothy D Murtha, Beatrice C Lupsa, Sachin Majumdar, Dhanpat Jain, Ronald R Salem
BACKGROUND: Pancreatic neuroendocrine tumors (PNETs) are a heterogeneous group of islet cell-derived neoplasms with a propensity toward hormone production. Among PNETs, proinsulin-secreting tumors (proinsulinomas) are exceedingly rare. The objective of this study is to collect and summarize the existing literature to provide a comprehensive evaluation of this uncommon disease. METHODS: A systematic review was performed to characterize the clinicopathologic features of proinsulinoma...
May 16, 2017: Journal of Gastrointestinal Surgery: Official Journal of the Society for Surgery of the Alimentary Tract
https://www.readbyqxmd.com/read/28507564/management-of-the-hormonal-syndrome-of-neuroendocrine-tumors
#10
Paweł Gut, Joanna Waligórska-Stachura, Agata Czarnywojtek, Nadia Sawicka-Gutaj, Maciej Bączyk, Katarzyna Ziemnicka, Jakub Fischbach, Kosma Woliński, Jarosław Kaznowski, Elżbieta Wrotkowska, Marek Ruchała
Gastroenteropancreatic neuroendocrine tumors (GEP/NET) are unusual and rare neoplasms that present many clinical challenges. They characteristically synthesize store and secrete a variety of peptides and neuroamines which can lead to the development of distinct clinical syndrome, however many are clinically silent until late presentation with mass effects. Management strategies include surgery cure and cytoreduction with the use of somatostatin analogues. Somatostatin have a broad range of biological actions that include inhibition of exocrine and endocrine secretions, gut motility, cell proliferation, cell survival and angiogenesis...
April 1, 2017: Archives of Medical Science: AMS
https://www.readbyqxmd.com/read/28504695/epigenetic-pathway-inhibitors-represent-potential-drugs-for-treating-pancreatic-and-bronchial-neuroendocrine-tumors
#11
K E Lines, M Stevenson, P Filippakopoulos, S Müller, H E Lockstone, B Wright, S Grozinsky-Glasberg, A B Grossman, S Knapp, D Buck, C Bountra, R V Thakker
Cancer is associated with alterations in epigenetic mechanisms such as histone modifications and methylation of DNA, and inhibitors targeting epigenetic mechanisms represent a novel class of anti-cancer drugs. Neuroendocrine tumors (NETs) of the pancreas (PNETs) and bronchus (BNETs), which may have 5-year survivals of <50% and as low as 5%, respectively, represent targets for such drugs, as >40% of PNETs and ~35% of BNETs have mutations of the multiple endocrine neoplasia type 1 (MEN1) gene, which encodes menin that modifies histones by interacting with histone methyltransferases...
May 15, 2017: Oncogenesis
https://www.readbyqxmd.com/read/28501471/comparison-of-endoscopic-ultrasound-guided-fine-needle-aspiration-and-pet-ct-in-preoperative-diagnosis-of-pancreatic-adenocarcinoma
#12
Jin-Ping Lai, Yong Yue, Wei Zhang, Yihua Zhou, David Frishberg, Laith H Jamil, James M Mirocha, Maha Guindi, Bonnie Balzer, Shikha Bose, Dengfeng Cao, Simon Lo, Xuemo Fan, Joanne K Rutgers
BACKGROUND: Endoscopic ultrasound guided fine needle aspiration (EUS-FNA) is the procedure of choice to investigate and sample pancreatic masses for the preoperative diagnosis of pancreatic ductal adenocarcinoma (PDAC). The role of (18)fluoro-deoxyglucose positron emission tomography/computed tomography (PET/CT) in PDAC is debated. This study evaluates the role of EUS-FNA as compared to PET/CT in the preoperative evaluation of PDAC. METHODS: Preoperative evaluation by PET/CT and EUS-FNA was performed on 25 patients with pancreatic solid lesions, who underwent a subsequent Whipple procedure or partial pancreatic resection...
April 13, 2017: Pancreatology: Official Journal of the International Association of Pancreatology (IAP) ... [et Al.]
https://www.readbyqxmd.com/read/28501118/impact-of-chromogranin-a-differentiation-and-mitoses-in-nonfunctional-pancreatic-neuroendocrine-tumors-%C3%A2-2%C3%A2-cm
#13
Katelin A Mirkin, Christopher S Hollenbeak, Joyce Wong
BACKGROUND: Small pancreatic neuroendocrine tumors (PNETs) are a unique subset of pancreatic neoplasms. Chromogranin A (CgA) levels, mitotic rate, and histologic differentiation are often used to characterize PNET behavior. This study evaluates the impact of these factors on survival in patients with PNETs. METHODS: The US National Cancer Data Base (1998-2012) was reviewed for patients with stages I-III, nonfunctional PNETs ≤2 cm. Clinicopathologic characteristics were collected, and univariate and multivariate survival analyses were performed...
May 1, 2017: Journal of Surgical Research
https://www.readbyqxmd.com/read/28498280/immunohistochemical-characterization-of-the-origins-of-metastatic-well-differentiated-neuroendocrine-tumors-to-the-liver
#14
Zhaohai Yang, David S Klimstra, Ralph H Hruban, Laura H Tang
Metastatic neoplasms of unknown primary site pose a major challenge to patient management. As targeted therapies are now being tailored to neuroendocrine tumors (NETs) of different primary sites, identifying the origin of metastatic NETs has become increasingly important. Compared with more extensive efforts on metastatic adenocarcinomas of unknown primary, the literature on metastatic NETs (often to the liver) is relatively sparse and most studies are based on primary tumors. We sought to study metastatic well-differentiated NETs to the liver to identify markers that predict the site of origin...
May 11, 2017: American Journal of Surgical Pathology
https://www.readbyqxmd.com/read/28488114/a-simple-morphological-classification-to-estimate-the-malignant-potential-of-pancreatic-neuroendocrine-tumors
#15
Atsushi Oba, Atsushi Kudo, Keiichi Akahoshi, Mitsuhiro Kishino, Takumi Akashi, Eriko Katsuta, Yasuhito Iwao, Hiroaki Ono, Yusuke Mitsunori, Daisuke Ban, Shinji Tanaka, Yoshinobu Eishi, Ukihide Tateishi, Minoru Tanabe
BACKGROUND: A novel morphological classification using resected specimens predicted malignant potential and prognosis in patients with pancreatic neuroendocrine tumors (P-NETs). The aim of this study was to examine the predictive ability of morphological diagnoses made using non-invasive multi-detector computed tomography (MDCT) in P-NETs. METHODS: Between 2002 and 2015, 154 patients were diagnosed with P-NETs at the Tokyo Medical and Dental University, and 82 patients who underwent surgical treatment were enrolled...
May 9, 2017: Journal of Gastroenterology
https://www.readbyqxmd.com/read/28487490/differentiation-of-pancreatic-neuroendocrine-carcinoma-from-pancreatic-ductal-adenocarcinoma-using-magnetic-resonance-imaging-the-value-of-contrast-enhanced-and-diffusion-weighted-imaging
#16
Chuangen Guo, Xiao Chen, Zhongqiu Wang, Wenbo Xiao, Qidong Wang, Ke Sun, Xiaoling Zhuge
Pancreatic neuroendocrine carcinoma (PNEC) is often misdiagnosed as pancreatic ductal adenocarcinoma (PDAC). This retrospective study differentiated PNEC from PDAC using magnetic resonance imaging (MRI), including contrast-enhanced (CE) and diffusion-weighted imaging (DWI). Clinical data and MRI findings, including the T1/T2 signal, tumor boundary, size, enhancement degree, and apparent diffusion coefficient (ADC), were compared between 37 PDACs and 13 PNECs. Boundaries were more poorly defined in PDAC than PNEC (97...
April 21, 2017: Oncotarget
https://www.readbyqxmd.com/read/28485270/a-review-of-the-scaffold-protein-menin-and-its-role-in-hepatobiliary-pathology
#17
Laurent Ehrlich, Chad Hall, Fanyin Meng, Terry Lairmore, Gianfranco Alpini, Shannon Glaser
Multiple endocrine neoplasia type I (MEN1) is a familial cancer syndrome with neuroendocrine tumorigenesis of the parathyroid glands, pituitary gland, and pancreatic islet cells. The MEN1 gene codes for the canonical tumor suppressor protein, menin. Its protein structure has recently been crystallized, and it has been investigated in a multitude of other tissues. In this review, we summarize recent advancements in understanding the structure of the menin protein and its function as a scaffold protein in histone modification and epigenetic gene regulation...
April 28, 2017: Gene Expression
https://www.readbyqxmd.com/read/28484200/pancreatic-schwannoma-revealed-contrast-by-contrast-enhanced-ultrasonography-a-case-report
#18
Takatoshi Egami, Takanori Yamada, Tomoharu Matsuura, Atsushi Tsuji, Yurimi Takahashi, Yuzo Sasada, Hideto Ochiai, Shohachi Suzuki, Shioto Suzuki, Yasuhiko Saida
An asymptomatic pancreatic tumor was discovered in a 77-year-old man during a medical check-up. An abdominal computed tomography (CT) and magnetic resonance imaging (MRI) revealed a cystic mass containing a septum-like solid portion in the head of the pancreas, measuring 3.5cm in diameter. Additionally, abdominal contrast-enhanced ultrasonography (US) revealed increased flow in the solid portion and a tumor capsule in its early phase. We preoperatively diagnosed the lesion as a cystic-degenerated pancreatic neuroendocrine tumor or solid-pseudopapillary tumor and performed a pancreatoduodenectomy...
2017: Nihon Shokakibyo Gakkai Zasshi, the Japanese Journal of Gastro-enterology
https://www.readbyqxmd.com/read/28480609/pancreatic-neuroendocrine-tumor-correlations-between-mri-features-tumor-biology-and-clinical-outcome-after-surgery
#19
Rodrigo Canellas, Grace Lo, Sreejita Bhowmik, Cristina Ferrone, Dushyant Sahani
PURPOSE: To assess which magnetic resonance imaging (MRI) features are associated with pNETs (pancreatic neuroendocrine tumors) grade based on the WHO classification, as well as identify MRI features related to disease progression after surgery. MATERIALS AND METHODS: In this Institutional Review Board (IRB)-approved study, 1.5T and 3.0T MRI scans of 80 patients with surgically verified pNETs were assessed. The images were evaluated for tumor location; size; pattern; predominant signal intensity on precontrast T1 - and T2 -weighted images, as well as on postcontrast arterial and portal venous phase T1 -weighted sequences; presence of pancreatic duct dilatation; pancreatic atrophy; restricted diffusion; vascular involvement by the tumor; extrapancreatic tumor spread; and synchronous liver metastases...
May 8, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28479381/integrated-clinicopathological-features-and-gene-microarray-analysis-of-pancreatic-neuroendocrine-tumors
#20
Huaqiang Zhou, Qinchang Chen, Wulin Tan, Zeting Qiu, Si Li, Yiyan Song, Shaowei Gao
Pancreatic neuroendocrine tumors are relatively rare pancreatic neoplasms over the world. Investigations about molecular biology of PNETs are insufficient for nowadays. We aimed to explore the expression of messenger RNA and regulatory processes underlying pancreatic neuroendocrine tumors from different views. The expression profile of GSE73338 were downloaded, including samples with pancreatic neuroendocrine tumors. First, the Limma package was utilized to distinguish the differentially expressed messenger RNA...
May 4, 2017: Gene
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