Serum copper level (SCL) was studied in 57 children with acute lymphoblastic leukemia (ALL) by atomic absorption spectrophotometry. It was found that changes in serum copper are to a greater extent related to the clinical course of ALL than to the age of the children examined. The highest mean SCL were obtained in untreated patients (261.2 microgram/100ml). Normalization of myelograms during treatment is accompanied by decrease of SCL. The significant increase of SCL in comparison with SCL in remission (129.8 microgram/100ml) occurred in extramarrow localizations (163.8 microgram/100 ml) and in the group of cases where after 1/2...2 months of maintenance therapy the recurrence of ALL was noted (168.8 microgram/100 ml). These observations suggest that SCL estimation may be useful as a auxiliary test in the clinical evaluation of the disease, for efficiacy of therapy and in predicting recurrences of ALL.
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