Abstract
Pancreatic endocrine tumors (PET), also often called islet cell tumors, are rare neoplasms thought to have an indolent natural course when compared to exocrine cancers of the pancreas. Their annual incidence is <1 per 100,000 person per year in the general population. Most tumors are sporadic but 15–30% can be part of multiple endocrine neoplasia type 1, von Hippel–Lindau’s disease, neurofibromatosis 1, or tuberous sclerosis (TSC1/2). Due the indolent nature and unspecific symptoms of the tumors, there is usually a delay in diagnosis, from 1 to 6 years, and, hence, they are metastastic and unresectable, when the diagnosis is finally made. The prognosis of patients with endocrine pancreatic tumors is difficult to predict because the criteria of malignancy have been ambiguous. Recently, two new classification systems have been developed. The WHO-classification divides PETs into three general categories: (1) well-differentiated endocrine tumors of benign behavior (confined to the pancreas, non-angioinvasive, no perineural invasion, <2 cm in diameter <2% Ki-67 positive cells) or uncertain behavior (confined to the pancreas and one or more of the following features: >2 cm in diameter, >2% Ki-67 positive cells, angioinvasion, perineural invasion), (2) well-differentiated endocrine carcinomas, low-grade malignant, with gross local invasion and/or metastases, and (3) poorly differentiated endocrine carcinomas, high-grade malignant. Recently, two tumor-node-metastasis (TNM) staging systems has been proposed, one by ENETS (Table 9.1), and another by the American Joint Committee on Cancer (AJCC) (Table 9.2), which will be used in the United States. Both the WHO and ENETS TNM-classifications are being adopted and validated by several groups.
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Eriksson, B. (2011). Medical Management of Islet Cell Carcinoma. In: Yao, J., Hoff, P., Hoff, A. (eds) Neuroendocrine Tumors. Current Clinical Oncology. Humana Press. https://doi.org/10.1007/978-1-60327-997-0_9
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