[Arylsulfatase A and B activity in acute lymphoblastic leukemia in children].

The activity of arylsulphatase A and B was determined in peripheral blood lymphoblasts in 23 children with acute lymphoblastic leukaemia before starting treatment. A low level of activity was found in the group of leukaemic children with poor prognosis, while in children with better prognostic indices this reactivity was high. The course of changes in this activity was traced also during induction of remission of leukaemia and during 3-year maintenance treatment.