The present invention relates to a fusion protein comprising therapeutic and diagnostic potential against chronic vascular diseases, such as atherosclerosis, a nucleic acid molecule encoding said fusion protein, a pharmaceutical and diagnostic composition which comprises the fusion protein or the nucleic acid molecule, the use of the fusion protein or the nucleic acid molecule for the production of a pharmaceutical and diagnostic composition, a method for the diagnosis of acute or chronic vascular diseases, and a method for the production of a fusion protein.