You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is All are TRUE about foregut carcinoid tumors, EXCEPT: and explain in detail?
Foregut carcinoid tumors generally have a low serotonin content. They are argentaffin-negative but argyrophilic and occasionally secrete adrenocoicotropic hormone or 5-hydroxytryptophan, causing an atypical carcinoid syndrome. They are often multi hormonal and metastasize to bone. Ref: Harrisons Principles of Internal Medicine, 18th Edition, Page 3058.