Abstract Library

#3381 Time to reclassify gastric carcinomas of diffuse type to neuroendocrine carcinomas

Introduction: The difference between adeno- and neuroendocrine carcinomas has been disputed for decades. Occurrence of neuroendocrine tumor cells in adenocarcinomas has been recognized, but the distinction between them has been made upon a certain number of tumor cells with a neuroendocrine marker. The number of positive cells depends upon the sensitivity of the method. Carcinogenesis generally results in loss and not gain of function. New gene expression of markers specific for a cell type seldom occurs.

Conference:

Presenting Author: Waldum H

Authors: Waldum H, Mjønes P,

Keywords: adenocarcinoma, neuroendocrine carcinoma, neuroendocrine tumor (NET), classification,

#3098 The incidence rate and clinical characteristics of autoimmune metaplastic atrophic gastritis and associated neoplasia in Chinese patients

Introduction: The incidence rate of autoimmune metaplastic atrophic gastritis (AMAG) is on the rise gradually and it may lead to an increased risk of associated gastric neoplastic lesions. However, there is limited literature about the respective incidence of neoplasia with AMAG, such as gastric neuroendocrine tumors (g-NETs), gastric hyperplastic polyps (GHPs) and gastric carcinoma.

Conference: 18th Annual ENETS Concerence (2021)

Presenting Author: Hu H

Authors: Hu H, Li R, Xu R, Zhang S,

Keywords: autoimmune metaplastic atrophic gastritis, incidence, neoplasia, gastric hyperplastic polyps, gastric carcinoma, pepsinogen 1/2 ratio,

#801 Normal Gastrointestinal Neuroendocrine Cells Lack E-cadherin

Introduction: E-cadherin plays a crucial role in the adhesion between epithelial cells and thus epithelial integrity. Moreover, germ line mutations in the E-cadherin gene (CDH1) causing loss of E-cadherin function (adhesion) leads to hereditary gastric cancer of the diffuse type, according to Laurén. Even sporadic gastric carcinomas of the diffuse type often lose E-cadherin expression due to mutations. Lack of E-cadherin has been recorded at an early phase in such carcinomas.

Conference: 11th Annual ENETSConcerence (2014)

Presenting Author: Hauso �

Authors: Hauso �, Nordbø H, Ringnes E, Sørdal �, Nordrum I,

Keywords: E-cadherin, neuroendocrine cell, gastric cancer, adhesion molecules, neuroendocrine tumors, carcinoid,

#622 Evaluation of Mucin and Neuroendocrine Expression in Diffuse Gastric Cancer with Signet Ring Cell Morphology

Introduction: A proportion of diffuse gastric carcinoma, according to the Lauren classification system, has signet ring cell morphology. Signet ring cells are characterized by a peripherally placed nucleus and a central amorphous substance, which is reported to be mucin based on Periodic Acid Schiff positivity (PAS). PAS is not a specific staining method for mucin. Neuroendocrine expression has previously been reported in tumor cells in diffuse type gastric cancer.

Conference: 10th Annual ENETSConcerence (2013)

Presenting Author: Sørdal �

Authors: Sørdal �, Qvigstad G, Nordrum I, Waldum H,

Keywords: gastric signet ring cell carcinoma, mucin, neuroendocrine markers, PAS,

#443 Neuroendocrine Carcinoma (NEC) and Composite Exocrine-Neuroendocrine Carcinoma (CENEC) of the Stomach: A Clinicopathological Review of 58 Cases

Introduction: NEC of the stomach is an uncommon tumor accounting for 0.5% of all gastric carcinomas and about 6% of gastric NETs. CENEC contain both areas of NEC and conventional carcinoma. The histological diagnosis is difficult.

Conference: 9th Annual ENETSConcerence (2012)

Presenting Author:

Authors: Vashakmadze L, Belous T, Khomyakov V, Cheremissov V, Mutasov A,

Keywords: neuroendocrine carcinoma, stomach NEC,