FCN3 and systemic lupus erythematosus: In SLE patients, the titers of anti-ficolin-3 antibodies were significantly associated with the titers of anti-dsDNA antibodies (r = 0.46, p<0.0001, Spearman test) (Fig 2A) as well as with the titers of anti-C1q antibodies (r = 0.38, p<0.0001, Spearman test) (Fig 2B).