Circulating serotonin is produced in the duodenum by enterochromaffin cells, specialized endocrine cells in the epithelia lining the gut, and functions within a specialized neuroendocrine network.

A clinical trial for patients with high-grade neuroendocrine tumors is now open for enrollment at Sylvester Comprehensive Cancer Center, part of the University of Miami Miller School of Medicine.

During the hospitalization, serum levels of serotonin and its metabolite ... Carcinoid tumors are neoplasms that arise from neuroendocrine cells throughout the body, but are most prevalent in ...