[Value of serum sialic acid determination in children].

In order to find out whether sialic acid (SA) is suitable as a tumor marker this compound was determined in the sera of 48 healthy and of 168 sick children. In healthy children under six months of age lower concentrations of SA were found (x = 41 +/- 5 mg/dl) than in subjects aged six months to 18 years (x = 68 +/- 8 mg/dl). Inflammatory diseases of various etiologies lead to a significant increase in both age groups (x = 93 +/- 28 mg/dl), the same could be observed in subjects up to 14 days after surgery. In children with malignant disorders the concentration of SA was significantly higher (x = 83 +/- 27 mg/dl) than in the healthy subjects, but not higher than in patients with inflammatory diseases. We conclude that SA might play a role in the follow up protocol of patients with malignant tumors.