In this context, we could have gained more information regarding the background of the presence of anti-CCP antibodies in PsA patients if we could examine the genetic terrain of these anti-CCP positive patients, knowing that Korendowych et al. observed that all PsA patients with positive anti-CCP antibodies carried the common epitope (HLA-DRB1) [12], a genotype characteristic to RA [21]. Here, HLA-DRB1 is linked to rheumatoid arthritis.