alexa A prospective study of the differential changes in serum thyroglobulin and its autoantibodies during propylthiouracil or radioiodine therapy of patients with Graves' disease.
Dermatology

Dermatology

Journal of Pigmentary Disorders

Author(s): FeldtRasmussen U, Bech K, Date J, Petersen PH, Johansen K, FeldtRasmussen U, Bech K, Date J, Petersen PH, Johansen K

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Abstract Measurement of serum thyroglobulin (Tg) and its autoantibody (TgAb) by radioimmunological methods was performed in 48 patients with Graves' disease during treatment with radioiodine (n = 16) or propylthiouracil (PTU) (n = 32). Twenty-five of the 48 patients were TgAb positive, their sera being inaccessible to measurement of serum Tg. TgAb showed only minor changes during PTU treatment, whereas TgAb fell rapidly after radioiodine, in 5 of 16 patients to unmeasurable levels, followed by a secondary rise to 4.5 times pre-treatment level after 20 weeks. Serum Tg showed a steady increase during the first weeks after radioiodine treatment, but fell to lower levels after one year. PTU caused only minor changes in the serum Tg concentration. There was no shift in molecular sizes of either Tg or TgAb during the course of the treatments. Five of 16 131I-treated patients developed myxoedema, 4 of whom were TgAb positive. Another 3 patients had high increases in TgAb without myxoedema. Six of 18 patients had relapse of thyrotoxicosis after withdrawal of PTU-treatment. There was no significant difference in serum concentrations of TgAb or Tg between those developing relapse and those remaining in remission, and it is concluded that serum Tg is a poor predictor of relapse in medically treated thyrotoxicosis.
This article was published in Acta Endocrinol (Copenh) and referenced in Journal of Pigmentary Disorders

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