MLL-PTD was rare in childhood AML.     ///    MLL(+) adults had a poor outcome with no difference in survival between MLL-PTD and MLL/t11q23 groups..     ///    11q23 abnormalities were detected in 64% of MLL/t11q23 and in none of MLL-PTD by conventional cytogenetics.     ///    The frequency of MLL-PTD was 7.1% in adults and 0.9% in children (P<0.001).     ///    "There were no differences in remission rate, event-free survival and overall survival between adult MLL-PTD and MLL/t11q23 groups. "