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The use of intensive antileukemic treatment is less widely accepted in high-risk MDS pts compared to de novo AML, due to the reported inferior results. It is questionable whether the poorer outcome reflects an intrinsic property of the involved stem cell or a higher frequency of poor prognostic factors. The purpose of this analysis is to identify disease-specific prognostic factors for outcome of young (aged <56 years) MDS and AML pts. This analysis combines the data of 591 pts in the AML-10 study and 203 pts with high-risk MDS or secondary AML (sAML) in the CRIANT study. Both groups received identical remission-induction therapy (idarubicin, cytarabine and etoposide), followed by one consolidation course with intermediate dose of cytarabine and idarubicin (IDIA). In both studies post-consolidation therapy consisted of alloSCT if an HLA-identical sibling donor was available. The remaining pts received autoSCT …