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  • Title: Remission of Graves' hyperthyroidism predicted by smooth decreases of thyroid-stimulating antibody and thyrotropin-binding inhibitor immunoglobulin during antithyroid drug treatment.
    Author: Takasu N, Yamashiro K, Komiya I, Ochi Y, Sato Y, Nagata A.
    Journal: Thyroid; 2000 Oct; 10(10):891-6. PubMed ID: 11081255.
    Abstract:
    It is important to know whether a patient with Graves' disease will get into remission or not during antithyroid drug (ATD) treatment. Thyrotropin (TSH) receptor antibodies (TRAb) cause Graves' disease. Thyroid-stimulating antibody (TSAb) and TSH-binding inhibitor immunoglobulin (TBII) have been measured as TRAb to diagnose Graves' disease and to follow Graves' patients. Smooth decreases of TSAb and TBII during ATD treatment predict the remission of Graves' hyperthyroidism. We followed serial changes of TSAb and TBII in 58 Graves' patients before, during, and after ATD treatment; TSAb was measured as a stimulator assay, using porcine thyroid cells, and TBII as a receptor assay. Patterns of TSAb and TBII changes during ATD treatment differ from one patient to another. TSAb and TBII activities decreased and disappeared in 52 (group A) but continued to be high in the other 6 (group B); 39 of the 52 group A patients achieved remission, but all of the 6 group B patients with persistently positive TSAb and TBII continued to have hyperthyroidism. No differences in the initial TSAb and TBII activities were noted between the 52 group A patients and the 6 group B patients. Of the 52 group A patients in whom TSAb and TBII had disappeared, 44 had smooth decreases of TSAb and TBII (group A1), and 8 had complex changes of TSAb and/or TBII (group A2); 36 of the 44 group A1 patients (82%) but only 3 of the 8 group A2 patients (37%) continued to be in remission more than 1 year after ATD discontinuation. The number of remission in group A1 was significantly larger than that in group A2. No differences in the initial TSAb and TBII activities were noted between group A1 and group A2. More than 80% of group A1 patients, who had smooth decreases of TSAb and TBII, continued to be in remission longer than 1 year. We demonstrated that smooth decreases of TSAb and TBII during ATD treatment predicted the remission of Graves' hyperthyroidism. The Graves' patients can be classified into A1, A2, and B groups according to the patterns of TSAb and TBII changes during ATD treatment. Group A1 patients, who had smooth decreases of TSAb and TBII, had higher rate of remission than the others. Smooth decreases of TSAb and TBII during the early phase of ATD treatment are a reliable predictor of the remission.
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