This will be a prospective, multicenter, non-interventional study. It will be performed in 7 central laboratories (Hospital Universitario la Fe, Hospital Universitario de Salamanca, Hospital 12 de Octubre, Hospital Universitario Virgen del Rocío, Hospital Reina Sofía, Hospital Dr. Negrín and Clínica Universidad de Navarra) from the spanish PETHEMA group that will receive and process bone marrow and peripheral blood samples from AML patients at diagnosis and at resistance or first and subsequent relapses. In parallel, all patients will be enrolled in the ongoing PETHEMA epidemiologic registry of AML with a large number of clinical data however no safety information/Adverse Events about drug treatments will be collected. Currently, the PETHEMA group is reporting 600 newly diagnosed patients per year and accounts for 5000 cases in the data-base.