A drug that is used in the treatment of cancer. It belongs to the family of drugs called antimetabolites. Also called fluorouracil.
5-hydroxyindoleacetic acid (5-HIAA)
A breakdown product of serotonin that is excreted in the urine. Serotonin is a hormone found at high levels in many body tissues. Serotonin and 5-HIAA are produced in excess amounts by carcinoid tumors, and levels of these substances may be measured in the urine to test for carcinoid tumors.