Analysis by Fisher exact test, Pearson chi-square test and log-rank test ^a)Prognostic subsets according to the new European Leukemia Net recommendations.

Abbreviations: RFI, relapse-free interval; HCT, hematopoietic stem cell transplantation; CR1, first complete response; CR2, second complete response; FLAG, fludarabine with G-CSF and Ara-C; MEC, mitoxantrone with etoposide and Ara-C; AI, ifosfamide; NS, not significant.