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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 ...
well-differentiated neuroendocrine tumors, further subdivided into tumors with benign and those with uncertain behavior; well-differentiated (low grade) neuroendocrine carcinomas with low-grade malignant behavior; poorly differentiated (high grade) neuroendocrine carcinomas, which are the large cell neuroendocrine and small cell carcinomas.
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 ]
Carcinoid syndrome is a paraneoplastic syndrome comprising the signs and symptoms that occur secondary to neuroendocrine tumors (formerly known as carcinoid tumors). [1] The syndrome is caused by neuroendocrine tumors most often found in the gut releasing biologically active substances into the blood causing symptoms such as flushing and diarrhea, and less frequently, heart failure, vomiting ...
The immunohistochemical phenotype of focal neuroendocrine differentiation in prostate cancer has been intensively studied. Chromogranin A, which is the most abundant product of prostatic neuroendocrine cells and neuroendocrine tumor cells, is widely recognized as a reliable marker for neuroendocrine differentiation. [4]
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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