Surgery, if feasible, is the only curative therapy. If the tumor has metastasized (most commonly, to the liver) and is considered incurable, there are some promising treatment modalities, such as radiolabeled octreotide (e.g. Lutetium (177Lu) DOTA-octreotate) or the radiopharmaceutical 131I-mIBG (meta iodo benzyl guanidine) for arresting the growth of the tumors and prolonging survival in patients with liver metastases, though these are currently experimental. Chemotherapy is of little benefit and is generally not indicated. Octreotide or lanreotide (somatostatin analogues) may decrease the secretory activity of the<unk> , and may also have an anti-proliferative effect. Interferon treatment is also effective, and usually combined with somatostatin analogues. As the metastatic potential of a coincidental<unk>  is probably low, the current recommendation is for follow up in 3 months with CT or MRI, labs for tumor markers such as serotonin, and a history and physical, with annual physicals thereafter.
Carcinoid
Analeptic
Psychogenic
Malignant 
Carcinogenesis
Carcinogen
Neuroskeptic
Toxicant