The present invention provides a method of preventing or reducing restenosis,neointima formation, graft failure, atherosclerosis, angiogenesis and/or solidtumour growth in a subject. The method comprises administering to the subjecta prophylactically effective dose of a nucleic acid which decreases the levelof c-Jun mRNA, c-Jun mRNA translation or nuclear accumulation or activity of c-Jun. It is preferred that the nucleic acid is a DNAzyme that targets c-JunmRNA.