Due to the association of thymic hyperplasia with autoimmune diseases, such as Graves' disease and myasthenia, it was suggested to dose anti-receptor antibodies, acetylcholine, and anti-muscarinic (associated with Graves' myasthenia), as well as anti-thyroid peroxidase and anti-thyroglobulin (associated with Graves' disease), which presented a negative result. This evidence concerns the gene TG and Graves disease.