MLLT3 and acute myeloid leukemia: In t(9;11)(p22;q23); KMT2A::MLLT3 (previously called MLL-AF9 and the most common KMT2A fusion in pediatric AML), prognosis appears to be related to morphology, as those with acute monoblastic features have a significantly better outcome than cases showing other cytochemical types, at least in one study [82].