Additional biochemical evaluation showed persistent mild hyperthyroidism (TSH 0.01 mU/L, FT4 22.7 pmol/L, T3 2.9 nmol/L; RI 1.3-2.7) and was negative for the presence of anti-TPO antibodies, anti-thyroglobulin antibodies, and TRAb. This evidence concerns the gene TG and hyperthyroidism.