11q23/MLL aberrations are a frequent abnormality in pediatric AML.24,25,26 The frequency of 11q23/MLL-rearranged AML may have been underestimated because of low number of cases in the included study and because in our study as well as in other studies performed in the past, the cryptic MLL rearrangements may be not detected by conventional karyotyping. Here, KMT2A is linked to acute myeloid leukemia.