Abstract Library

#4539 Single-nucleus profiling of the tumour microenvironment in SI-NET patients

Introduction: Small intestinal neuroendocrine tumours (SI-NETs) are frequently present as multiple synchronous primary tumours in the small bowel. They are thought to arise from enterochromaffin (EC) cells in the gut, which account for less than 1% of the intestinal epithelium. Previously reported lack of shared somatic driver alterations in SI-NETs suggests that other, non-genetic mechanisms are likely involved in their tumorigenesis.

Conference:

Presenting Author: Mäkinen N

Authors: Mäkinen N, Kasai Y, Kim G, Thirlwell C, Nakakura E,

Keywords: small intestinal NET, tumour microenvironment, single-nucleus sequencing,

#4507 Biliary complications for metastatic patients with neuroendocrine tumours of the pancreatic head and their influence on survival: Is it necessary to change the current management?

Introduction: Neuroendocrine tumours of the pancreatic head (NETPH) can be associated with local complications. At the metastatic stage, surgery of the primary tumour (PT) is not a standard of care. But the biliary complications (BC) due to the untreated NETPH may complicate the management and deteriorate the prognosis.

Conference:

Presenting Author: Ujlaki G

Authors: Ujlaki G, Fernandez de Sevilla E, Moog S, Lamartina L, Hadoux J,

Keywords: neuroendocrine, pancreatic head, metastatic, biliary complications,

#4496 ATRX, DAXX, and menin immunohistochemistry identify prognostic relevant non-functioning neuroendocrine tumours subgroups

Introduction: Non-functioning pancreatic neuroendocrine tumours (NF-pNETs) are rare tumours with a variable prognosis. Recent studies have identified prognostic subgroups based on ATRX, DAXX and MEN1 mutations along with chromosomal aneuploidies.

Conference:

Presenting Author: Verschuur A

Authors: Verschuur A, Jairam J, Eldem B, Singhi A, Hackeng W,

Keywords: pancreatic neuroendocrine tumour, ATRX, DAXX, MEN1, menin, biomarker,

#4327 Metastatic non-functional pancreatic neuroendocrine tumour with transformation to insulinoma shown on 68Ga-Exendin-4 PET/CT

Introduction: 68Ga-exendin-4 PET/CT imaging has been utilised for benign insulinomas. However, some reports demonstrated the absence of GLP-1R expression of malignant insulinomas.

Conference:

Presenting Author:

Authors: Gao J, Xu J, Liang Y, Chen J, Song S,

Keywords: pancreatic neuroendocrine tumour, PET/CT, insulinoma, 68Ga-exendin-4,

#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,