title: Effect of metastatic cancer on platelet monoamine oxidase activity and serotonin metabolism.
abstract: Platelet monoamine oxidase (MAO) activity and urinary excretion of 5-hydroxyindoleacetic acid (5-HIAA), serotonin, tyramine and tryptamine were measured in patients with a variety of metastatic cancers and in healthy control subjects. The patients with cancer had higher platelet MAO activity and lower urinary excretion of 5-HIAA, sertonin and tyramine than the healthy subjects. The urinary tryptamine excretion was not significantly different in the two groups. At the present time it is unclear if the alterations in platelet MAO activity and monoamine excretion are casually related.
mesh_terms: D000328:Adult; D000368:Aged; D001792:Blood Platelets / Q000201:enzymology*; D005260:Female; D006801:Humans; D006897:Hydroxyindoleacetic Acid / Q000652:urine; D008297:Male; D008875:Middle Aged; D008995:Monoamine Oxidase / Q000097:blood*; D009362:Neoplasm Metastasis; D009369:Neoplasms / Q000378:metabolism*; D012701:Serotonin / Q000652:urine*; D014363:Tryptamines / Q000652:urine; D014439:Tyramine / Q000652:urine
chemical_list: D014363:Tryptamines; D012701:Serotonin; D006897:Hydroxyindoleacetic Acid; D008995:Monoamine Oxidase; D014439:Tyramine