The most common autoimmune marker was anti-nuclear antibody (ANA) (22/36, 61%), followed by lupus anticoagulant (15/30, 50%) and any one marker of autoimmune thyroiditis, namely anti-thyroid peroxidase, anti-thyroglobulin, or anti-TSH-receptor antibody (16/37, 43%). This evidence concerns the gene TPO and autoimmune thyroid disease.