LPA and systemic lupus erythematosus: The initial search yielded 67 citations, there were 25 articles for “Lp(a)” AND “rheumatoid arthritis,” 20 for “systemic lupus erythematosus,” 4 for “immune system,” 11 for “APS,” 3 for “systemic sclerosis”, and 4 for “autoimmune disease.” The literature research showed no citations for the keywords “systemic vasculitis” and “Sjögren's syndrome.” Thirteen citations (Frostegard, Sari, Romero 2000 (3), Zhang 2011, Atsumi, Sakata) were duplicates.