Between 1995-1997, at 7 centres of the Polish Paediatric Leukaemia/Lymphoma Study Group (PPLLSG) treatment was started in 102 children with acute non-lymphoblastic leukaemia. Sixty-two children treated according to the new protocol adjusted for risk factors were evaluated. Thirty-one patients belonged to standard risk and 23 to high risk group. Eight children were not evaluated due to early death. Out of 62 children, 44 (70,9%) achieved remission; in standard and high risk groups the rates of remission were 87,5% and 73%, respectively. Four-year event-free survival (EFS), relapse-free survival (RFS) and overall survival (OS) probability in all patients were: 40,2%, 42% and 59% respectively, in standard risk group: 49,5%, 52,5%, 59,1%; in high risk group: 42%, 43,4% and 57,8%. In comparison with the previous period (1983-1994) EFS increased from 30% to 42%, which was statistically insignificant.