Clonal expansion of a new MLL rearrangement in the absence of leukemia

Clonal expansion of mixed-lineage leukemia (MLL) rearrangements is highly indicative for acute leukemia.[1][1]-[5][2] Here, we report the unusual finding of an MLL rearrangement in the absence of leukemia. A 5-year-old girl was diagnosed with acute myeloid leukemia (AML) characterized by a variant