BTG3 and autoimmune disease: The workup for autoimmune diseases was negative and included myeloperoxidase antibody (< 20 IU/ml), proteinase 3 antibody (< 20 IU/ml), anti-CCP < 7 U/ml, HLA-B27 (-), ANA-IIF < 1:100, and ANA + ENA antibody spectrum (-).