Abstract Library

#3047 Functional Consequence of β-Arrestin 1 Gene Knock-Out in Pancreatic Neuroendocrine Tumor Cell Line BON-1

Introduction: An important limiting factor influencing treatment efficacy of neuroendocrine tumors (NETs) with somatostatin analogs (SSA) is the availability of somatostatin receptors (SSTR) on NETs. While downregulation or altered pattern of SSTR expression are important considerations, receptor internalization/desensitization by β-arrestins may be a crucial contributing factor. Interestingly, our previous study showed a preferential higher expression of β-arrestin 1 (ARRB1), in gastroenteropancreatic NETS (GEP-NETs) compared to pituitary adenomas.

Conference: 17th Annual ENETSConcerence (2020)

Presenting Author: Iyer A

Authors: Iyer A, Vriens J, Dogan-Oruç F, van Koetsveld P, Hofland L,

Keywords: β-arrestin 1, CRISPR-Cas9, BON-1, knock-out, SSTR, SSA, Pan-NET,

#2983 Differential TGF-β Signalling in Typical and Atypical Bronchial Carcinoids

Introduction: Typical and atypical bronchial carcinoids (TBC and ABC) are well-differentiated neuroendocrine neoplasms (NEN). Metastatic BC having low to moderate mitotic count may still be treated with somatostatin analogues and mTOR inhibitors; however, TBC and ABC have been reported to respond very differently to therapy and an effective treatment algorithm is still lacking. TGF-β is known for its ability to activate mTOR pathway and induce epithelial mesenchymal transition, affecting cell pathophysiological capabilities such as proliferation, migration and tissue invasiveness.

Conference: 17th Annual ENETSConcerence (2020)

Presenting Author: Borges de Souza P

Authors: Borges de Souza P, Tagliatti V, Capobianco S, Ambrosio M, Chinnici S,

Keywords: Neuroendocrine neoplasms, bronchial carcinoids, TGF-β,

#2876 Efficacy of Surufatinib in Western Patients (pts) with Pancreatic Neuroendocrine Tumors (PanNETs)

Introduction: Surufatinib is a targeted inhibitor of tyrosine kinases VEGFR1, 2, & 3, FGFR1, and CSF-1R. The safety profile was favorable in 2 completed studies (NCT02133157, NCT02267967) conducted in China. A recent phase 3 placebo controlled study (NCT02588170) confirmed safety, and demonstrated superior efficacy (PFS: 9.2 v 3.8 months) of Surufatinib in Chinese pts with advanced extra-pancreatic NETs (epNET).

Conference: 17th Annual ENETSConcerence (2020)

Presenting Author:

Authors: Dasari A, Paulson S, Sung M, Tucci C, Kauh J,

Keywords: Neuroendocrine Tumors, Pancreatic, Surufatinib,

#2827 Characterization of Epigenetic Modulation in Pancreatic Neuroendocrine Neoplasms

Introduction: Pancreatic neuroendocrine tumors (PanNETs) represent a rare and heterogeneous tumor entity. Despite advances in therapy cancer progression and resistance mechanisms are still challenging. Recent genome wide sequencing analyses in PanNETs identified a large number of mutated genes involved in epigenetic modulation.

Conference: 17th Annual ENETSConcerence (2020)

Presenting Author: Schmitz R

Authors: Schmitz R, Weißbach J, Kleinlein J, Schrader J, Grabowski P,

Keywords: PanNET, HDAC-Inhibition, SOCS3, lncRNA, Macrophages,

#2789 The Patient Journey – Experience from Symptoms to Diagnosis among Patients with Small Intestinal Neuroendocrine Tumours (SINET)

Introduction: Patients with SINET often have diffuse symptoms delaying diagnosis. In a patient survey it was observed that 1/3 of NET patients had a time span to diagnosis of > 5 years, with a median of 52 months. Here we assess the patients’ experience during that time period.

Conference: 17th Annual ENETSConcerence (2020)

Presenting Author: Holgersson K

Authors: Holgersson K, Ståhl E, Nilsson M, Grauers B, Mårtensson-Djäken E,

Keywords: SINET, patients' experience, interview,