Disclosed is the use of Volasertib or a salt or a hydrate thereof for treating patients suffering from acute myeloid leukemia (AML) comprising administering a high dose of Volasertib in combination with fludarabine, cytarabine and Granulocyte colony-stimulating factor (GCSF) or in combination with fludarabine, cytarabine, GCSF and a daunorubicin citrate liposome injection.