. . "GP-related antigens as biomarkers for certain diseases, for example, atherosclerosis and other vascular diseases, and angiogenesis/neogenesis in tumor development.In a preferred embodiment of the invention, monoclonal antibodies of class IgG are provided for use in said diagnostic immunoassay which are obtainable by hybridomas formed by fusion of cells from a mouse myeloma and spleen cells from a" . .