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). This evidence concerns the gene RUNX1 and chronic myelogenous leukemia, BCR-ABL1 positive.