Abstract: The present invention relates to a method of treating a warm-blooded animal having acute myeloid leukemia (AML) which is resistant to conventional chemotherapy, comprising administering to said animal a therapeutically effective amount of a compound of formula I wherein the radicals and symbols have the meanings as defined in the specification, together or in combination with a conventional compound or compound mixture useful in AML treatment, in particular a topoisomerase II inhibitor, an antimetabolite, or an antitumor antibiotic, for simultaneous, separate or sequential use, and to a pharmaceutical composition and a commercial package comprising said combination.