Abstract library

22 results for "DNA damage repair".
#2280 The BON-SSTR2 Chicken Chorioallantoic Membrane (CAM) Model for the Analysis of Lu-17-DOTATOC Sensitizing Agents
Introduction: Peptide radioreceptor therapy (PRRT) is a promising therapy option for SSTR2-positive pancreatic neuroendocrine neoplasms (NEN). However, therapeutic effects are often not satisfying concerning sensitivity to PRRT. We hypothesize that the slow proliferation of NENs provides sufficient time for the repair of beta-particle induced-DNA damage. The ubiquitin-proteasome-system is involved in DNA damage repair and affected by the proteasome inhibitor bortezomib (Velcade®). The inhibition of DNA damage repair during PRRT may be an option to improve therapy response in NEN. We have recently demonstrated the damage repair inhibitory and pro-apoptotic effect of bortezomib in NEN in vitro (Briest et al., in revision).
Conference: 15th Annual ENETS conference (2018)
Category: Basic Science - In vitro models, tumor growth, CTCs
Presenting Author: Dr. Franziska Briest
#401 Status of DNA Repair and Cell Proliferation Markers in High Grade Neuroendocrine Carcinoma of the Uterine Cervix (cNEC) Compared to Small Cell Carcinoma of the Lung (SCLC)
Introduction: Most patients (pts) with cNEC are treated with chemotherapy regimens used for SCLC due to both tumors’ histological similarity and aggressive behavior.
Conference: 9th Annual ENETS Conference (2012)
Category: Basic
Presenting Author: Boris Naraev
#1404 The Proteasome Inhibitor Bortezomib Is a Highly Effective Treatment Option for Gastroenteropancreatic Neuroendocrine Neoplasms and Sensitizes to DNA Damaging Therapy In Vitro
Introduction: Gastroenteropancreatic neuroendocrine neoplasms are fairly rare tumors with very heterogeneous behavior and molecular characteristics. Their generally slow proliferation render them virtually resistant to many DNA damaging therapeutic approaches. Bortezomib has been shown to be effective in GEP-NENs in vitro but has been withdrawn from clinical assessment due to a small phase II study on bortezomib monotherapy in 2004.
Conference: 13th Annual ENETS conference (2016)
Category: Medical treatment - Targeted therapies
Presenting Author: Franziska Briest
#55 Metronomic combination therapy including temozolamide, bevacizumab and somatostatin analogue for the treatment of malignant gastroenteropancreatic neuroendocrine tumors
Introduction: Malignant gastroenteropancreatic neuroendocrine tumors (GEPNETS), mainly carcinoids, are not considered to be particularly chemotherapy-sensitive to conventional chemotherapeutic schemes. Long-standing evidence suggests these tumors to be highly vascularised and responsive to antiangiogenic strategies. Newest reports demonstrate benefit by the use of temozolamide, an oral alkylating agent similar to intravenous dacarbazine. The DNA repair enzyme O6-alkylguanine–DNA alkyltransferase (AGAT) confers cancer cell resistance to O6-alkylating agents such as temozolamide through its ability to remove methyl/alkyl groups from the O6-position of guanine, thus correcting drug-induced DNA damage.
Conference: 7th Annual ENETS Conference (2010)
Category: Clinical
Presenting Author: DR Anna Koumarianou
#1546 O6-Methylguanine DNA Methyltransferase (MGMT) Expression by Immunochemistry May Help Predict Response to Streptozotocin-based Chemotherapy in Pancreatic Neuroendocrine Tumours
Introduction: Streptozotocin (STZ) is an alkylating agent inducing DNA damage mainly repaired by MGMT. STZ-based chemotherapy is the first line treatment of non-resectable well-differentiated PNET. As for temozolomide, tumour MGMT deficiency may predict the efficacy of STZ in PNET.
Conference: 13th Annual ENETS conference (2016)
Category: Medical treatment - Chemotherapy
Presenting Author: Dr Olivia Hentic
Authors: Hentic O, Cros J, Zappa M, Rebours V, ...
Keywords: MGMT, Streptozotocin, PFS
#2239 pNET G3 Tumor Stabilization Achieved by an Individualized Molecular Therapy Based on Tumor Genome Sequencing Results
Introduction: High-grade pancreatic neuroendocrine neoplasms (pNENs) constitute a heterogeneous group of malignant neoplasms, encompassing neuroendocrine tumors (NET) G3 and carcinomas (NEC). Due to poor data on NET G3 tumors no standard therapy in metastatic disease could be established so far. Tumor genome sequencing might help to better profile NET G3 tumors and could provide novel opportunities for individualized and thereby successful patient specific treatments.
Conference: 15th Annual ENETS conference (2018)
Category: Case reports
Presenting Author: Martina Steurer
#1845 Mismatch Repair (MMR) Protein Expression is Uncommon in Poorly Differentiated Neuroendocrine Carcinoma
Introduction: Microsatellite instability (MSI) has been reported to occur in a significant proportion of neuroendocrine carcinoma (NEC) and mixed adenoneuroendocrine carcinomas (MANEC) (11 out of 89 cases, Sahnane et al, ERC 2015). It might be predictive of response to immunotherapy.
Conference: 14th Annual ENETS conference (2017)
Category: Biomarkers
Presenting Author: Dr Julien Hadoux
#2101 The Effect of Temozolomide on Pancreatic Neuroendocrine Tumors in Vitro and Role of MGMT and MMR System in Temozolomide Resistance
Introduction: Temozolomide (TMZ) has been suggested as a treatment option for patients with pancreatic neuroendocrine tumours (PNETs). The tumour response to TMZ has been linked to expression levels of O6-methylguanine-DNA methyltransferase (MGMT) and components of the mismatch repair (MMR) system.
Conference: 15th Annual ENETS conference (2018)
Category: Basic Science - In vitro models, tumor growth, CTCs
Presenting Author: Drs. Anela Blazevic
#616 Assessment of DNA Double-Strand Breaks in Blood Lymphocytes after Whole-Body Radiation Exposure in Patients with Neuroendocrine Tumors Undergoing 177Lu-Octreotate Therapy
Introduction: Peptide receptor radionuclide therapy using somatostatin receptor-binding peptides, such as 177Lu-Octreotate (LuTate), has been clinically proven to be effective in treating patients with inoperable neuroendocrine tumors. Despite the rather high radiation exposure, only few side effects have been reported. However, blood cells are very sensitive to radiation. Therefore, it is important to determine how much radiation they received. Recently, the detection by immunofluorescence of the phosphorylation of the histone variant H2AX (γ‐H2AX) has been established as a reliable and sensitive technique to monitor DNA double-strand breaks (DSBs) in blood lymphocytes.
Conference: 10th Annual ENETS Conference (2013)
Category: Basic Science - Genetics, epigenetics, miRNAs
Presenting Author: Dr Delphine Denoyer
#174 Loss of Expression of the DNA Mismatch Repair Proteins MLH1 and MSH2 is Rare in Pancreatic and Small Intestinal Neuroendocrine Tumors
Introduction: Loss of expression of the DNA mismatch repair (MMR) proteins MLH1 and MSH2, which is known to correlate strongly with MSI, has not been well studied in pancreatic or small intestinal NETs.
Conference: 8th Annual ENETS Conference (2011)
Category: Basic
Presenting Author: Dr Daniel Rayson
Authors: Rayson D, Arnason T, Sapp H, Barnes P, ...