Excretion of octopamine metabolites in neuroblastoma.

The urinary concentrations of o-hydroxymandelic acid, m-hydroxymandelic acid, p-hydroxymandelic acid, homovanillic acid and vanillylmandelic acid were determined in 57 healthy children and 9 patients with neuroblastoma. The concentrations of o-hydroxymandelic acid and p-hydroxymandelic were not significantly different for both groups whereas the concentrations of m-hydroxymandelic acid, homovanillic acid and vanillylmandelic acid were elevated 20- to 30-fold in the neuroblastoma patients.