Subclones with the t(9;22)/BCR-ABL1 rearrangement occur in AML and seem to cooperate with distinct genetic alterations..     ///    These cases allow some interesting conclusions: The BCR-ABL1 rearrangement apparently can cooperate with the NPM1 mutation similar to other class-I-mutations.     ///    Four patients had m-BCR (e1a2) BCR-ABL1 transcripts.     ///    "In rare cases of myeloid malignancies, the BCR-ABL1 fusion was reported to cooperate as class-I-mutation with class-II-mutations, but most cases had to be classified as blast phase of chronic myeloid leukaemia (CML). "