Flow cytometric analysis, chromosome analysis, FISH, and reverse transcriptase-PCR (RT-PCR) results indicated AML-MRC resulting from t(3;21) with the RUNX1-MECOM fusion gene.     ///    Detection of RUNX1-MECOM fusion gene and t(3;21) in a very elderly patient having acute myeloid leukemia with myelodysplasia-related changes.. 