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The Neuroendocrine Tumor Research Foundation directs your individual donations to breakthrough scientific research. Since 2005, we have funded $37.6 million in research projects. The Neuroendocrine Research Foundation is a 501(c)(3) organization, so all donations are fully tax-deductible to the extent allowed by law. We are grateful to you for your generosity.
Home » For Patients » Nonfunctional and Functional NETS » Nonfunctional and functional GI NETs
Although many nonfunctional GI NETs may grow for a long time without causing signs or symptom, some nonfunctional tumors may cause signs or symptoms if the tumor blocks parts of the GI tract.
In functional GI NETs, the hormones released are usually metabolized as the blood flows from the gut to the liver. If the tumor has spread to the liver and the liver enzymes cannot destroy the extra hormones made by the tumor, high amounts of these hormones may remain in the body and cause carcinoid syndrome.
Carcinoid syndrome
The signs and symptoms of carcinoid syndrome include: