FLT3 and susceptibility to pneumonia measurement: As this difference might be associated with the observed difference in the overall survival, we analyzed in detail the reasons for unusually low number of transplantations (5/19) in the group 2: although additional 7 patients were indicated due to Flt3-ITD positivity or relaps (12/19 in total), the transplantation could not be performed mainly due to unfavorable leukemia status (6/7, 1 patient had atypical pneumonia and flu).