Cases were subclassified into primary myelofibrosis (PMF), n=4; refractory cytopenia with multilineage dysplasia, n=3; acute myeloid leukemia (AML) with myelodysplasia-related changes, n=3; refractory anemia with excess blasts-2, n=1; AML-not otherwise specified, n=1; therapy-related AML, n=1; blast phase of PMF, n=1; and chronic myelomonocytic leukemia, n=1.