Abstract Library

#4194 Temozolomide treatment induces an MMR-dependent hypermutator phenotype in well-differentiated pancreatic neuroendocrine tumors

Introduction: Temozolomide (TMZ), an alkylating agent, is an effective treatment used in multiple tumor types including advanced pancreatic neuroendocrine tumors (PanNET). In glioblastomas, TMZ induces a hypermutator and hyperprogressor phenotype in a subset of patients through MMR deficiency. In advanced colon cancer, TMZ priming increases tumor mutational burden (TMB), favouring immunotherapy efficacy.

Conference:

Presenting Author: de Mestier L

Authors: de Mestier L, Cohen D, de Rycke O, Masliah Planchon J, Fleischmann Z,

Keywords: temozolomide, hypermutation, pancreatic neuroendocrine tumor,

#4189 Pit and pitfalls of tumor mutational burden assessment in well-differentiated pancreatic neuroendocrine tumors: Two case reports from University of Verona

Introduction: The hypermutated phenotype is used as a predictive parameter for immune-checkpoint inhibitors (ICI). However, the relationship between high TMB, the underlying mutational drivers and response to ICI is still unclear.

Conference:

Presenting Author: Trevisani E

Authors: Torresan I, Reni A, Trevisani E, Borghesani M, Rossi A,

Keywords: Neuroendocrine tumor, NGS, Tumor Mutational Burden, Alkylating agent, DNA Damage Repair, Liquid biopsy,

#4182 DNA damage repair genes alterations in pancreatic neuroendocrine tumor treated with Temozolomide

Introduction: Temozolomide (TMZ), a standard therapy for pancreatic neuroendocrine tumors (pNETs), is an alkylating agent causing missense mutations and triggering cell death.

Conference:

Presenting Author: Trevisani E

Authors: Trevisani E, Reni A, Torresan I, Borghesani M, Rossi A,

Keywords: DNA Damage Repair, Tumor mutational burden, Neuroendocrine, Temozolomide,

#3969 A case report of a high-grade pancreatic NET patient with high tumor mutation burden who benefited from chemotherapy combined with immunotherapy

Introduction: For patients with well-differentiated G3 NET, the efficacy of immune checkpoint inhibitors (ICIs) is currently not clear. The expression level of PD-L1 in tumor tissue, high microsatellite instability (MSI-H), and high tumor mutational burden (TMB-H) are considered indicators for selecting potential beneficiaries of immunotherapy.

Conference:

Presenting Author:

Authors: Jia X, Liang Y, Chen J,

Keywords: g3 pancreatic net, captem, tmb-h, icis,

#3250 High TMB and MSI-high as independent predictors of survival in NENs

Introduction: To date, there are no validated molecular biomarkers for personalized therapy in NENs. Tumor genome sequencing may help unravel NEN molecular landscape and identify novel targets for an individualized approach.

Conference: 18th Annual ENETS Concerence (2021)

Presenting Author:

Authors: La Salvia A, Barroso G, Espinosa Olarte P, Anton Pascual B, Modrego Sanchez A,

Keywords: molecular profiling, neuroendocrine neoplasm, TMB, microsatellite instability (MSI)/mismatch repair deficiency (MMRd) status, prognosis,