Abstract Library

#4446 Uncommon ophthalmic presentation of a small bowel neuroendocrine tumour: Case report

Introduction: Neuroendocrine tumours (NETs), including carcinoid tumours, are slow-growing neoplasms commonly originating in the gastrointestinal tract or bronchus, but they can also arise in other sites. Due to their indolent nature, the majority of NETs are diagnosed at an advanced stage, typically to the lymph nodes, liver, or bones.

Conference:

Presenting Author:

Authors: Hamidatou K, Behourah Z, Ahed Messaoud M, Megaiz A, Lechar M,

Keywords: Neuroendocrine tumour, Carcinoid tumour, Orbital metastasis, somatostatin analogue injection,

#4235 Tricuspid valve replacement and liver transplantation in a 51-year-old female patient with grade 1 ileum NET and refractory carcinoid syndrome

Introduction: Refractory carcinoid syndrome (RCSy) could lead to severe complications.

Conference:

Presenting Author: Tőke J

Authors: Tőke J, Kövesdi A, Szolnoky J, Huszty G, Piros L,

Keywords: refractory carcinoid syndrome, liver transplantation, ileum neuroendocrine tumor,

#4166 Characterising the tumor microenvironment of multifocal small intestinal NETs

Introduction: Small intestinal neuroendocrine tumors (SI-NETs) are thought to arise from enterochromaffin cells of the gut, often with multiple synchronous primary tumors. Recently, we showed that synchronous primary tumors from the same SI-NET patient display distinct somatic mutational profiles, suggesting that these tumors originate independently, despite few clear driver mutations. Thus, new mechanistic insights into multifocal SI-NETs are urgently needed.

Conference:

Presenting Author:

Authors: Mäkinen N, Lee I, Dohlman A, Gao T, Zhang Z,

Keywords: small intestinal NET, tumor microenvironment, tumor microbiome,

#3874 Ileum NET lost to follow-up due to COVID-19 pandemic presents with multiple metastases and severe carcinoid syndrome

Introduction: Small bowel neuroendocrine tumors (NETs) arise from the diffuse neuroendocrine system. These are often diagnosed as a result of acute symptomatology such as bowel obstruction and are the most common cause of carcinoid syndrome (CS) due to liver metastases (LM).

Conference:

Presenting Author:

Authors: Diculescu R, Becheanu G, Croitoru A, Poiana C,

Keywords: neuroendocrine tumor, carcinoid syndrome, carcinoid heart disease, Octreotide,

#3805 Transcriptomic analyses of multifocal ileal neuroendocrine tumors

Introduction: Small intestinal neuroendocrine tumors are mostly located in the distal ileum with a high incidence of multiple synchronous primary tumors. To date, loss of heterozygosity (LOH) at chr18 has been the most frequent genomic event identified, occurring in ~60% of tumors. Recently, we showed that synchronous primary tumors from the same ileal NET patient display distinct somatic mutational profiles, including distinct patterns of chr18 LOH, suggesting these tumors originate independently. Thus, new mechanistic insights into multifocal ileal NETs are urgently needed.

Conference:

Presenting Author:

Authors: Mäkinen N, Zhang Z, Munn S, Kasai Y, Kim G,

Keywords: Multifocal ileal NETs, RNA-sequencing, Gene expression,