Given that the LL37 and IFNα serum levels were increased in AAV patients, particularly in those with crescentic GN, we further investigated whether the serum levels of LL37 were correlated with the IFNα levels and whether the levels of LL37 and IFNα were correlated with the serum levels of creatinine and complement C3. This evidence concerns the gene C3 and anti-neutrophil cytoplasmic antibody-associated vasculitis.