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[Selenium, glutathione peroxidase and TBARS in plasma of children with malignant diseases of the hematopoietic system].

The selenium and TBARS concentrations and glutathione peroxidase activity were measured in the plasma of children with leukemia, lymphoma and histiocytosis X. A group of fifty-four children aged 1 to 16 years was divided into the following age groups: 1-3, 3-7, 7-16 years. In the patients aged 3-7 and 7-16 years, plasma selenium concentration and glutathione peroxidase activity were significantly lower than in age-matched healthy children.