Journal
BIOLOGY-BASEL
Volume 12, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/biology12081069
Keywords
neuroendocrine tumors; somatostatin analogs; combination treatment; carcinoid syndrome
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There are various systemic combination regimens being investigated for advanced well-differentiated gastroenteropancreatic neuroendocrine tumors (GEP-NETs). This review provides an overview of the clinical trials and prospective studies on combination treatments. Results show a wide range of efficacy in reported combinations, and only a few phase 3 trials have shown practice-changing results. Peptide receptor radionuclide therapy (PRRT)-based combinations and anti-vascular endothelial growth factor (VEGF) agent combinations with standard chemotherapy have shown promising results, while immune-checkpoint inhibitor-based combinations have limited applicability.
There is an evolving landscape of systemic combination regimens for patients with advanced well-differentiated gastroenteropancreatic neuroendocrine tumors (GEP-NETs). In this review, we provide a comprehensive outline of the existing clinical trials/prospective studies investigating these combinations. PubMed was searched using key relevant terms to identify articles referring to GEP-NETs and combination treatments. No systematic search of the literature or metanalysis of the data was performed, and we focused on the most recent literature results. Primarily, phase 1 and 2 clinical trials were available, with a smaller number of phase 3 trials, reporting results from combination treatments across a wide range of antiproliferative agents. We identified significant variability in the anti-tumor activity of the reported combinations, with occasional promising results, but only a very small number of practice-changing phase 3 clinical trials. Overall, the peptide receptor radionuclide therapy (PRRT)-based combinations (with chemotherapy, dual PPRT, and targeted agents) and anti-vascular endothelial growth factor (VEGF) agent combinations with standard chemotherapy were found to have favorable results and may be worth investigating in future, larger-scale trials. In contrast, the immune-checkpoint inhibitor-based combinations were found to have limited applicability in advanced, well-differentiated GEP-NETs.
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