[Increased rate of sister chromatid exchange following therapy of acute lymphoblastic leukemias and non-Hodgkin lymphomas in childhood].

Sister chromatid exchanges rates (SCE) were studied in peripheral blood lymphocytes of 10 patients with acute lymphoblastic leukaemia (ALL) or leukaemic transformed non-Hodgkin-lymphomas (NHL) and in lymphocytes of 10 healthy juvenile donors (control). Following treatment the patient group has been in continuous complete remission for 11 months on the average. In the number of SCE's significant differences were found: 10,90/metaphases in the patients versus 7,56/metaphases in the controls. These results significantly show a long time influence of the treatment on the SCE rates, possibly inducing chromosome aberrations.