MECOM and acute myeloid leukemia: Some of the fusions are common, such as the ETV6/RUNX1 [t(12;21)(p13;q22)] in ALL, RUNX1/RUNX1T1 (also known as AML1/ETO) [t(8;21)(q22;q22)] in AML and RUNX1/MECOM [t(3;21)(q26;q22)] in MDS, AML and CML in the blastic phase, whereas many of them have only been reported in single cases, i.e., they have not yet been shown to be recurrent (2,3).