Disclosed is a vector, preferably a viral vector, containing a treatment factor and/or a nucleic acid encoding a cytotoxic factor under control of an Aurora kinase promoter. Also disclosed is a virus vector in which the promoter of a nucleic acid encoding a factor necessary to the replication or assembly of at least one virus is substituted by the Aurora kinase promoter. Also disclosed are a disease treatment agent, in particular a cancer treatment agent, which contains the aforementioned vector, and a clinical diagnostic agent, in particular a cancer diagnostic agent, which contains the vector containing the Aurora kinase promoter.