Between 1977–87, 319 patients with AML were admitted to Hannover Medical School. At all 41 of these patients were not treated (median duration of survival 0.6 months). Among the 278 treated patients, there was a CR rate of 53.6% the median duration of remission was 10.1 months and the median duration of survival 7.0 months. The patients with FAB-classification M4-M5 had a worse prognosis than those with M1-M3. Patients under 50 years of age had a significant higher remission rate and survival time than those over 50 years. In the last 10 years, the remission rate rase from 37.3% to 61.0% (p = 0.1776). There was a rise in median duration of survival from 5.9 months (1977–79) to 8.0 months (1984–85) (p < O.001). The median remission time decreased from 15.8 months (1977–79) to 12.0 months (1984–85) (p < O.001). After the first reinduction therapy, the remission rate (46.6%), duration of remission (5.3 months), and duration of survival (4.1 months) was lower than after primary therapy. After the second reinduction therapy the CR rate was 69.2%, and the remission time 2.9 months. The CR rate after the third reinduction therapy