To achieve a complete characterization of AML, inmunophenotype analysis (defining the pattern for MRD studies), cytogenetics, FISH for inv(16), t(8;21) and t(15;17), and molecular study for AML1/ETO, CBFβ/MYH11, NPM1 and FLT3-ITD will be performed in all cases. For FLT3-ITD, the ratio between the mutated and not mutated allele will be calculated.