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Neuroendocrine neoplasms are highly heterogeneous tumors in terms of primary origin, molecular landscape, clinical presentation and behavior. To date, several drugs have been approved and many ongoing trials are testing new agents or new combinations. In this work we aim to provide a comprehensive review of approved agents and promising novel drugs in clinical development for the treatment of neuroendocrine neoplasms. Our manuscript could be a useful review and guidance for neuroendocrine neoplasms-dedicated clinicians.

Neuroendocrine tumors (NETs) are a heterogeneous family of neoplasms of increasing incidence and high prevalence due to their relatively indolent nature. Their wide anatomic distribution and their characteristic ability to secrete hormonally active substances pose unique challenges for clinical management. They are also characterized by the common expression of somatostatin receptors, a target that has been extremely useful for diagnosis and treatment (i.e., somatostatin analogues (SSAs) and peptide-receptor radionuclide therapy (PRRT)). Chemotherapy is of limited use for NETs of non-pancreatic origin, and the only approved targeted agents for advanced progressive NETs are sunitinib for those of pancreatic origin, and everolimus for lung, gastrointestinal and pancreatic primaries. Despite recent therapeutic achievements, thus, systemic treatment options remain limited. In this review we will discuss the state-of-the-art targeted therapies in the field of NETs, and also future perspectives of novel therapeutic drugs or strategies in clinical …