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The new 2019 WHO classification and grading criteria for neuroendocrine tumors of the digestive system grades all the neuroendocrine tumors into three grades, based on their degree of cellular differentiation (from well-differentiated NET grade (G)1 to G3, and poorly-differentiated neuroendokrina cancer, NEC G3), morphology, mitotic rate and Ki ...
The World Health Organization (WHO) classification scheme places neuroendocrine tumors into three main categories, which emphasize the tumor grade rather than the anatomical origin: [4] [5] well-differentiated neuroendocrine tumors, further subdivided into tumors with benign and those with uncertain behavior
Gastrinoma is the second most common functional pancreatic neuroendocrine tumor (pNET), with a yearly incidence of approximately 0.5 to 21.5 cases per a million of people worldwide. [5] Gastrinomas are located predominantly in the duodenum (70%) and pancreas (25%). [ 20 ]
Grading in cancer is distinguished from staging, which is a measure of the extent to which the cancer has spread. Pathology grading systems classify the microscopic cell appearance abnormality and deviations in their rate of growth with the goal of predicting developments at tissue level (see also the 4 major histological changes in dysplasia ).
Stomach cancer, also known as gastric cancer, is a malignant tumor of the stomach. It's a cancer that develops from the lining of the stomach . [ 10 ] Most cases of stomach cancers are gastric carcinomas , which can be divided into a number of subtypes, including gastric adenocarcinomas . [ 2 ]
The tumor typically produces serotonin, Tachykinin peptides and other substances, which cause flushing, tachycardia, diarrhea and in some cases fibrosis of the heart valves. [citation needed] There are often several small and highly fibrotic tumors present in the intestine. The tumors often spread to the mesenteries and the liver. [citation needed]
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