We developed an allele-specific quantitative polymerase chain reaction (AS-qPCR) for FLT3 2503G>T, KIT 2446G>T, and KIT 2447A>T and compared the change in the expression levels of the FLT3 or KIT mutations assessed by AS-qPCR to those of the RUNX1-RUNX1T1 fusion gene and WT1 by conventional quantitative PCR.     ///    The change in the expression levels of the FLT3 or KIT mutations at the time of relapse and just after hematopoietic stem cell transplantation correlated well with that of the RUNX1-RUNX1T1 fusion gene and WT1. 