Abstract Library

#4563 Clinical case of a young woman with acromegaly, hyperprolactinemia and pituitary tumour with mixed morphology of adenoma and gangliocytoma

Introduction: Acromegaly is a rare disorder that develops due to persistent hypersecretion of somatotropic hormone in adults after closure of the growth plates. In the majority of cases, the cause is a pituitary adenoma.

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Presenting Author:

Authors: Markova M, Kirova I, Elenkova A, Robeva R, Zacharieva S,

Keywords: acromegaly, hyperprolactinemia, pituitary adenoma, gangliocytoma,

#4519 ANXA1-labelled cancer-associated fibroblasts induces tumour invasion and immunosuppressive microenvironment

Introduction: The growth pattern of a tumour is a marker for distinguishing inert from invasive tumours. In general, tumours such as the encapsulated follicular variant of papillary thyroid carcinoma show expansive growth. In contrast, invasive tumours, such as colorectal cancer and squamous cell carcinoma of the tongue, show invasive growth with infiltration into surrounding structures and have a poorer prognosis. Pancreatic neuroendocrine neoplasm (PNEN) is the heterogeneous tumour originating from peptidergic neurons and neuroendocrine cells. PNEN with a high proportion of tumour mesenchyme, especially those presenting an infiltrating stroma, have a poor prognosis. In the infiltrating mesenchyme, cancer-associated fibroblasts (CAF) play an important role. However, little research has been done on the mechanisms of how infiltrating CAF affects tumour malignancy and immune microenvironment.

Conference:

Presenting Author: Wang Y

Authors: Wang Y, Xu J, Chen J, Xu X, Ji S,

Keywords: pancreatic neuroendocrine neoplasm, tumour-associated fibroblasts, immunosuppressive microenvironment,

#4342 A real-world retrospective analysis to evaluate the efficacy and safety of surufatinib in the treatment of unresectable, locally advanced or metastatic neuroendocrine neoplasms in China

Introduction: The incidence of NENs is on the rise. In NECs, research on surufatinib is still scarce.

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Presenting Author:

Authors: Liu S, Zhang L, Liu B, Liu Q,

Keywords: neuroendocrine neoplasm, surufatinib, neuroendocrine carcinoma, neuroendocrine tumour, real-world study,

#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,

#4007 Inactivation of PHLDA3 gene leading to tumorigenesis of pancreatic neuroendocrine tumors and its molecular mechanisms

Introduction: The molecular mechanism underlying the tumorigenesis of sporadic pancreatic neuroendocrine tumors (PNETs) is largely unknown. Our previous studies showed that loss of heterozygosity (LOH) at chromosome 1q31 (including PHLDA3 gene) was frequently found in sporadic PNETs (2005 insulinoma and 2003 gastrinoma, respectively).

Conference:

Presenting Author: Song Y

Authors: Song Y, Tong W, Wang Z, Chen Y,

Keywords: pancreatic neuroendocrine tumor, PHLDA3, tumorigenesis, prognosis,