The results of treatment for childhood acute myelogenous leukemia (AML) have improved considerably during the last ten years. This progress was demonstrated by the two consecutive multicenter studies, AML-BFM-78 and -83, in which almost identical extended multi drug regimes of che motherapy were administered for eight weeks and followed up by two years maintenance. The main difference in the second study was the addition of an eight-day intensive in duction course. Due to this new element, the relapse rate was reduced significantly. Another result of the BFM-83 study was the definition of two...