Described is a pharmaceutical composition containing (a) a parvovirus and (b) a chemotherapeutic agent, preferably as separate entities. The parvovirus might be based on parvovirus H1, LuIII, Mouse minute virus (MMV), Mouse parvovirus (MPV), Rat minute virus (RMV), Rat parvovirus (RPV), Rat virus (RV), vectors based on the foregoing viral species, and/or cells capable of actively producing the foregoing viral species. The pharmaceutical composition is beneficial for the treatment of a tumor. Tumors for which a parvovirus or the adjunction of the invention has particular utility include glioma, medulloblastoma, meningioma and pancreatic cancer. Preferred chemotherapeutic agents are gemcitabine and Temozolodine.