^a)Cases with changed karyotypes between diagnosis and relapse; ^b)Cases with unchanged karyotypes between diagnosis and relapse.

Abbreviations: FAB, French-American-British classification; EM, extramedullary; WBC, white blood count; Fav., favorable; Int., intermediate; Unfav., unfavorable; No., number; OR, overall response; CR, complete response; CRp, CR with incomplete platelet recovery; HCT, hematopoietic stem cell transplantation; RFI, relapse-free interval; CR1, first complete response; SD, standard deviation; NS, not significant.