NPM1 and acute myeloid leukemia: NPM1 mutations were associated with a high percentage of blasts in peripheral blood (79.7 versus 33.1, P < 0.001), a high percentage of bone marrow blasts (91.2 versus 63.5, P < 0.001) and de novo AML (100% de novo AML with NPM1 mutations versus 71.43% de novo AML without NPM1 mutations, P = 0.068).