Abstract library

330 results for "mammalian target of rapamycin".
#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
#96 Expression of components of the mTOR pathway in gastroenteropancreatic neuroendocrine tumors
Introduction: Recently, the mammalian target of rapamycin (mTOR) inhibitors have entered late phase clinical trials in a broad variety of solid human malignancies, including neuroendocrine tumors (NETs). Since these drugs will certainly be used as routine therapeutics in the near future, it is surprising that information on the exact expression patterns of mTOR and its downstream target 4EBP1 in NETs is still lacking.
Conference: 7th Annual ENETS Conference (2010)
Category: Basic
Presenting Author: Atsuko Kasajima
#100 Mammalian target of rapamycin (mTOR) expression analysis and therapeutic approach in lung and gastroenteropancreatic poorly differentiated endocrine carcinoma (PDEC)
Introduction: PDEC clinically include gastroenteropancreatic PDEC, small cell lung cancer (SCLC) and large cell neuroendocrine carcinoma (LCNEC). These tumors are clinically similar and aggressive and they are usually treated with platinum compounds. mTOR signalling pathway has emerged as a promising target for well-differentiated endocrine carcinoma therapy. Because of varying behavior, PDEC are usually excluded from clinical trials employing the mTOR inhibitor RAD001.
Conference: 7th Annual ENETS Conference (2010)
Category: Basic
Presenting Author: Emilio Bajetta
#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, ...
#154 Long-term disease stabilization in a patient with advanced pancreatic neuroendocrine tumor treated with combined everolimus and octreotide LAR after prior failure of cytotoxic therapy
Introduction: Targeting of multiple pathways has become an important strategy for improved tumor control in metastatic neuroendocrine tumors (NETs). Among these targets is the mammalian target of rapamycin (mTOR), a central regulator of cell growth, proliferation, and apoptosis, which is blocked by everolimus, an oral inhibitor of mTOR that has shown efficacy in patients with metastatic pancreatic NETs. Recent evidence has suggested that suppression of insulin-like growth factor-1 receptor (IGF-1R) secretion with octreotide therapy, along with concurrent inhibition of mTOR by everolimus, may improve tumor control synergistically by preventing feedback activation of the PI3K/Akt/mTOR pathway.
Conference: 7th Annual ENETS Conference (2010)
Category: Clinical
Presenting Author: Alexandre Teulé Vega
#276 Mammalian Target of Rapamycin Pathway Activation is Associated with RET Mutation Status in Medullary Thyroid Carcinoma
Introduction: The genetic pathways involved in medullary thyroid carcinoma (MTC), except for RET mutations, are largely unknown, as well as the detailed expression mapping of intracellular signalling transducers.
Conference: 8th Annual ENETS Conference (2011)
Category: Basic
Presenting Author: MD Marco Volante
#437 mTOR Expression in Primary Pancreatic Neuroendocrine Tumors and their Metastases
Introduction: The mammalian target of rapamycin (mTOR), an important regulator of cell proliferation and invasion, is activated in pancreatic neuroendocrine tumors (PNETs). Information on detailed expression of mTOR in locally advanced or metastatic PNET is poorly described.
Conference: 9th Annual ENETS Conference (2012)
Category: Clinical
Presenting Author: Prof Vera Delektorskaya
Authors: Kozlov N, Pavlovskaya A, ...
#648 Mammalian Target of Rapamycin (mTOR) Expression Analysis and Therapeutic Approach in Primitive (T) and Metastatic (M) Ileal Neuroendocrine Tumors (INT)
Introduction: mTOR signalling pathway has emerged as a promising target for well-differentiated endocrine pancreatic carcinoma therapy. Because of varying behavior, INT are usually excluded from clinical trials employing the mTOR inhibitor, RAD001.
Conference: 10th Annual ENETS Conference 2013 (2013)
Category: Pathology, grading, staging
Presenting Author: MD, PhD Massimo Milione
Keywords: mTor, midgut, carcinoid
#701 High Expression of Mammalian Target of Rapamycin (mTOR) in NF1-Related Periampullary Neuroendocrine Tumors
Introduction: Neurofibromatosis type 1 (NF1) is a rare inherited disorder associated with cutaneous lesions and neoplasms in the nervous and gastroenteropancreatic systems, including periampullary NETs. NF1-coded protein, neurofibromin, is a tumor suppressor that negatively regulates the mammalian target of rapamycin (mTOR). Preclinical in vitro and in vivo studies demonstrated a constitutive activation of mTOR pathway associated with significant antineoplastic effects of mTOR inhibitors in NF1-related glial tumor models.
Conference: 10th Annual ENETS Conference 2013 (2013)
Category: Surgical treatment
Presenting Author: MD Paola Razzore
#726 Expression and Phosphorilation of mTOR Pathway and Antitumor Activity of mTOR Inhibitors in Neuroendocrine Tumors
Introduction: The mammalian target of rapamycin (mTOR) is a protein kinase involved in the control of cancer cell metabolism, growth and proliferation. The mTOR pathway has attracted broad scientific and clinical interest, particularly in light of the ongoing clinical cancer trials with mTOR inhibitors in pts with neuroendocrine tumors (NETs). To identify the best candidates for treatment with mTOR inhibitors is challenging.
Conference: 10th Annual ENETS Conference 2013 (2013)
Category: Epidemiology/Natural history/Prognosis - Registries, nationwide and regional surveys
Presenting Author: Concetta Sciammarella