The present invention provides a combination comprising (a) a compound of formula (I) and (b) one or more antineoplastic agents selected from the group consisting of an antimetabolite agent, analkylating or alkylating-like agent, an intercalating agent, a topoisomerase I or II inhibitor, an antimitotic agent, a kinase inhibitor, a proteasome inhibitor and an antibody inhibiting a growth factor or its receptor, wherein active ingredients of the combination are present in each case in free form or in the form of a pharmaceutically acceptable salt or any hydrate or solvate thereof, useful in the treatment of tumors.