Abstract library

1723 results for "tumor heterogeneity".
#2283 Ultra-Deep Targeted Resequencing Reveals Recurrent DAXX and CYFIP2 Mutations and Implicates Novel Pathways in Pancreatic Neuroendocrine Tumors
Introduction: Recent studies in pancreatic neuroendocrine tumors have identified mutations in DAXX/ATRX, MEN1, and genes involved in the phosphoinositide-3-kinase/Akt/mammalian target of rapamycin (PI3K-Akt-mTOR) pathway. However, these studies focused on abundant mutations.
Conference: 15th Annual ENETS conference (2018)
Category: Basic Science - Genetics, epigenetics, miRNAs, Omics
Presenting Author: Timon Vandamme
#584 KI-67 HETEROGENEITY IN GASTRO-ENTERO-PANCREATIC NEUROENDOCRINE TUMORS
Introduction: The neuroendocrine tumor (NET) proliferation-based grading system (ENETs/WHO) has proved reliable for prognostic stratification, however concerns exist on Ki67 heterogeneity.
Conference:
Category: Basic
Presenting Author: Dr Federica Grillo
#961 Heterogeneity in the Ki-67 Index of Neuroendocrine Tumors
Introduction: Tumor heterogeneity due to tumor evolution is becoming more widely recognised. Neuroendocrine tumors (NET) are routinely graded using the Ki-67 index based on a single tumor location, however, this could lead to undergrading if the Ki-67 index is higher at the metastatic site.
Conference: 11th Annual ENETS Conference (2014)
Category: Pathology, grading, staging
Presenting Author: Helen Miller
Authors: Miller H, Flora R, Drymousis P, Wasan H, ...
#22 A Case Illustrative of Phenotypic Heterogeneity and Challenges in the Management of Paraganglioma
Introduction: Paragangliomas (PGLs) are extra-adrenal, usually benign, highly vascularized tumors that originate from neural-crest-derived chromaffin cells. These tumors are subdivided as either sympathetic or parasympathetic, depending on their location and catecholamine production. Sympathetic PGLs are situated along the abdominal sympathetic trunk and usually produce catecholamines, whereas parasympathetic PGLs are located in the head and neck, and these usually do not produce catecholamines. PGLs may present as sporadic or inherited tumor syndrome, including MEN 2, with RET germline mutations, von Hippel-Lindau (VHL) disease due to germline mutations in VHL gene, and pheochromocytoma-PGL syndrome. The latter is frequently a hereditary condition and is caused by germline mutations in the SDHB, SDHC, or SDHC genes. Patients with familial PGLs may present at a younger age, often as multifocal tumors, with an increased risk of recurrence and a higher frequency of malignancy in those with SDHB mutations. SDH mutations induce angiogenesis and tumorogenesis through the inhibition of hypoxia-inducible factors (HIF)-propyl hyroxylase. A younger age at onset, malignancy, and a positive family history are clinical parameters of high specificity, but low sensitivity for diagnosis. Genetic analysis for mutations in SDH genes for the patient and family members, and surveillance for the affected patient and family members, are necessary where there are no clear clinical or family indicators for the syndrome. We present a case of a large abdominal malignant PGL in a 20-year-old pt. that went on without clinical detection for at least three years.
Conference: 7th Annual ENETS Conference (2010)
Category: Clinical
Presenting Author: Dr Mohammed Ahmed
#863 Assessment of Neuroendocrine Tumors' Heterogeneity with Combination of Molecular Imaging Studies
Introduction: Neuroendocrine tumors (NET) are heterogeneous neoplasms. The choice of the appropriate molecular imaging study for assessment of disease extent usually depends on tumor grade.
Conference: 11th Annual ENETS Conference (2014)
Category: Imaging (radiology, nuclear medicine, endoscopy)
Presenting Author: MD Roberta E Rossi
#2162 Single Cell Copy Number Variation Analysis (CNV) of Circulating Tumor Cells (CTCs) in Neuroendocrine Tumor (NET) Patients
Introduction: The identification and characterization of CTCs as part of a minimally invasive “liquid biopsy” provides an opportunity to explore NET biology, identify therapeutic targets and investigate tumour heterogeneity.
Conference: 15th Annual ENETS conference (2018)
Category: Basic Science - In vitro models, tumor growth, CTCs
Presenting Author: Dr Alexa Childs
Authors: Childs A, Vesely C, Rizzo F M, Ensell L, ...
#544 Second Primary Tumor in Patients with Gastroenteropancreatic Neuroendocrine Tumors (GEPNETs): Data From a Retrospective Observational Unicentric Study
Introduction: It is known that GEPNETs are associated with a high incidence of second primary tumors, especially in the context of inherited syndromes and synchronous injuries to the intestine.
Conference: 9th Annual ENETS Conference (2012)
Category: Clinical
Presenting Author: MD Paula J Fonseca
#151 Rationale for combining mTOR with other targeted agents in the treatment of neuroendocrine tumors
Introduction: Advanced neuroendocrine tumors (NETs) are aggressive and incurable with standard treatment. Many cellular targets are being evaluated in this patient population, including mammalian target of rapamycin (mTOR), a kinase that is the central regulator of several signaling pathways related to cell growth, angiogenesis, and bioenergetics. Because mTOR serves as a neoplastic switch activated by many cancer-related mutations, mTOR inhibition may have broad efficacy across tumor types, including NETs. Somatostatin analogs (SSAs) have long been used to treat carcinoid symptoms in NET patients. The SSA octreotide long-acting release (LAR) demonstrated significant antitumor effects against advanced midgut NETs in the phase III PROMID study.
Conference: 7th Annual ENETS Conference (2010)
Category: Clinical
Presenting Author: Kjell Öberg
Authors: Öberg K, Yao J C, ...
#158 Progression-free survival (PFS) as a primary endpoint for clinical studies in advanced neuroendocrine tumors (NETs)
Introduction: Successfully testing new antitumor agents requires primary study endpoints that are clinically important, and also provide sufficient statistical power within a timeframe and population size that is feasible for the tumor type. Using overall survival (OS) as the primary endpoint in NET studies is challenging because of the low incidence (5.25/100,000 annually), disease heterogeneity, extended survival time (Yao 2008), and confounding effects of multiple therapies. These inherent aspects of NETs make OS an extremely difficult and challenging endpoint to evaluate clinical efficacy.
Conference: 7th Annual ENETS Conference (2010)
Category: Clinical
Presenting Author: Simron Singh
Authors: Singh S, Law C, ...
#1606 Tumor Growth Rate to Assess Tumor Activity in Patients with Lung Neuroendocrine Tumors on Lanreotide Autogel: A Case-Series Analysis
Introduction: The slow-growing character of neuroendocrine tumors (NET) makes it difficult to assess treatment impact on tumor growth.
Conference: 14th Annual ENETS conference (2017)
Category: Clinical cases/reports
Presenting Author: Frank van Fraeyenhove
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