Abstract Library

#2993 Proposal of New Imaging Criteria for Evaluating the Response of Liver Metastases to Systemic Treatments in Digestive Neuroendocrine Tumors (NET) as an Alternative to RECIST 1.1

Introduction: RECIST 1.1 criteria have been challenged for the evaluation of treatment response in NET.

Conference: 17th Annual ENETSConcerence (2020)

Presenting Author:

Authors: de Mestier L, Dromain C, Lamarca A, La Salvia A, Op de Beeck B,

Keywords: imaging criteria, response evaluation, CT scan,

#2804 Claudin-18 Is a Sensitive and a Specific Marker for Gastric Neuroendocrine Tumors

Introduction: Antibody-based cancer therapies are emerging as promising therapeutics in oncology, including one in clinical trials that targets claudin-18, a protein expressed in normal gastric epithelium and some gastric adenocarcinoma. We currently have no markers for gastric well-differentiated neuroendocrine tumors (NETs).

Conference: 17th Annual ENETSConcerence (2020)

Presenting Author:

Authors: Wong M, Huynh C, Kim S, Dhall D, Guindi M,

Keywords: claudin-18, anti-claudin 18, neuroendocrine tumor, neuroendocrine hyperplasia, autoimmune metaplastic atrophic gastritis,

#2129 Phosphohistone H3 (PHH3) Immunohistochemical Staining Outperforms Conventional H&E Mitotic Count in Classifying Pulmonary Carcinoids

Introduction: Pulmonary carcinoids (PC) are well-differentiated NETs and are classified as typical carcinoid (TC) and atypical carcinoid (AC). Despite the fact that TC and AC exhibit significant differences in patient survival, their classification depends on relatively subtle differences in mitotic count (MC). Although careful counting of mitotic figures (MF) is essential, it is a very subjective task, time-consuming and lacks of sensitivity and interobserver reproducibility, due to selection bias of the hot spots, heterogeneous distribution of MF, difficulty in distinguishing MF from similar chromatin changes (i.e. in apoptotic cells or due to crush, karyorrhectic debris, pyknosis or apoptosis).

Conference: 15th Annual ENETSConcerence (2018)

Presenting Author: Luong T

Authors: Luong T, McCaughran W, Caplin M, Toumpanakis C, Thirlwell C,

Keywords: Phosphohistone H3, Pulmonary Carcinoids, Typical Carcinoid, Atypical Carcinoid, Mitotic Count, H&E,

#2126 Histone Replacement in Cancer: Dissecting the Role of H3.3 Chaperones in Pancreatic Tumorigenesis

Introduction: Cancer driver mutations affecting the histone H3.3 chromatin remodellers ATRX and DAXX were recently discovered in 43% of sporadic pancreatic neuroendocrine tumours (PNET). Progressive age-dependent replacement of canonical H3.1/2 with H3.3 is crucial for maintaining genome integrity through expression of repressive markers at heterochromatic sites, where loading is mediated by ATRX and DAXX. Loss of H3.3 chaperones in PNET is associated with activation of ALT, a telomere maintenance mechanism, eventually leading to chromosome instability. It has been suggested that ATRX/DAXX expression is necessary for repressing ALT, but mechanistic details of this interaction are not fully understood.

Conference: 15th Annual ENETSConcerence (2018)

Presenting Author: Sposito T

Authors: Sposito T, C Nguyen Tu M, Thirlwell C, Salomoni P,

Keywords: PNET, mouse model, epigenetic,

#2097 Oral Ondansetron Offers Effective Symptomatic Bridging for Carcinoid Syndrome Refractory to Somatostatin Analogues

Introduction: Somatostatin analogues (SSA) are standard for symptomatic patients with neuroendocrine tumours (NETs). However, most patients experience tachyphylaxis, and limited options exist for this refractory carcinoid syndrome (RCS). Recently, ondansetron has been associated with reduction of bowel movement in a small series.

Conference: 15th Annual ENETSConcerence (2018)

Presenting Author: Kiesewetter B

Authors: Kiesewetter B, Duan H, Haug A, Riss P, Selberherr A,

Keywords: carcinoid syndrome, ondansetron, 5-HT3 antagonist, neuroendocrine tumor, somatostatin, analogues,