They were also observed in 67% (2/3) of AML with <i>CBFB::MYH11</i> fusion and in 20% (3/15) of primary myelofibrosis, but were absent in polycythemia vera, essential thrombocythemia, and chronic myelomonocytic leukemia. This evidence concerns the gene MYH11 and acquired polycythemia vera.