Diagnostic Applications of Nuclear Medicine: Neuroendocrine Tumors

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Nuclear Oncology

Abstract

Neuroendocrine tumors (NETs) originate from neuroendocrine cells ubiquitously distributed throughout the body and occur mainly in the gastrointestinal and bronchopulmonary system. They are rare, mostly sporadic, and comprise 0.66% of all neoplasia. Their incidence/prevalence is increasing based upon more sophisticated diagnostic strategies. Despite the majority being indolent, they are frequently metastatic at diagnosis. As a consequence, their prognosis is often limited.

The European Neuroendocrine Tumor Society (ENETS) diagnostic and prognostic stratification criteria are based on histological ty**, differentiation, grading (Ki67), and TNM staging. Although the general application of Ki67 is controversial, it remains embedded in therapeutic decision-making pending the implementation of molecular stratification systems.

Surgery is the only curative option. It is, however, effective in ~20% given the metastatic status of most lesions. Other therapeutic options include somatostatin analogs, interferon, “targeted” drugs, and peptide receptor radionuclide radiotherapy (PRRT).

NETs present a diagnostic and therapeutic challenge as their clinical presentation is protean, nonspecific, and late with hepatic metastases often present. Imaging plays a fundamental role in diagnosis, staging, treatment selection, and follow-up. Current modalities include morphologic techniques (CT, MRI), transabdominal ultrasound (US), endoscopic (EUS), and intraoperative US (IOUS). Molecular imaging includes scintigraphy (with111In-pentetreotide or 99mTc-HYNIC-Tyr3-octreotide) and, more recently, PET with 68Ga- and 64Cu-labeled somatostatin analogs (SSA), 18F-DOPA, and [11C]C-5-HTP. Catecholamine metabolism is usually imaged with 123I-metaiodo-benzylguanidine. [18F]FDG PET/CT has a prognostic role. A role for somatostatin receptor antagonists (better target/background ratio) as theranostics is currently proposed.

The major unmet needs are the development of more inclusive criteria for therapy monitoring, the validation of the recent PET techniques, and the integration of molecular biologic and metabolic information.

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Bodei, L. et al. (2022). Diagnostic Applications of Nuclear Medicine: Neuroendocrine Tumors. In: Volterrani, D., Erba, P.A., Strauss, H.W., Mariani, G., Larson, S.M. (eds) Nuclear Oncology. Springer, Cham. https://doi.org/10.1007/978-3-319-26067-9_18-2

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    Diagnostic Applications of Nuclear Medicine: Neuroendocrine Tumors
    Published:
    18 August 2022

    DOI: https://doi.org/10.1007/978-3-319-26067-9_18-2

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    Diagnostic Applications of Nuclear Medicine: Neuroendocrine Tumors
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    17 October 2016

    DOI: https://doi.org/10.1007/978-3-319-26067-9_18-1

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