NPM1 and acute myeloid leukemia: The aim of the presented study was to analyze a relationship between the expression of the chosen microRNA: miR-34a, miR-191, miR-199a and miR-199b and the response to induction chemotherapy in AML patients in the context of recognized prognostic factors (including FLT3-ITD, FLT3D835, NPM1 and CEBPA mutations and cytognenetic changes) as well as parameters of complete blood count.