Abstract: The present invention relates to an antibody, or an antigen-binding fragment thereof, specifically binding to APRIL for use in the prevention and/or treatment of hypertriglyceridemia, metabolic syndrome, non-alcoholic steatohepatitis, diabetes mellitus type 2, abdominal aortic aneurysm, atherogenic dyslipidemia, cardiovascular events (e.g., myocardial infarction and stroke) and/or atherosclerosis. The invention further relates to a polynucleotide that encodes and/or a pharmaceutical composition that comprises the antibody or an antigen-binding fragment of the invention. The invention also relates to a kit and/or method for quantifying the concentration of nc-APRIL, canonical APRIL or total APRIL in a sample. Further, the invention relates to a nephelometric assay for quantifying nc-APRIL.