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We describe 4 patients with onset or aggravation of thyroid dysfunction induced by interferon (IFN) treatment of hepatitis type C. All 4 patients were females; 2 had hyperthyroidism and 2 had hypothyroidism during or after IFN therapy. The onset or aggravation of thyroid dysfunction occurred during administration of IFN in 1 patient and 4 weeks after the end of IFN therapy in the remaining 3 patients. The 2 patients who demonstrated hyperthyroidism were euthyroid and negative for thyroid autoantibodies before receiving IFN therapy. The remaining 2 patients who demonstrated hypothyroidism were positive for thyroid autoantibodies before IFN therapy. One of these patients had a slight decrease in thyroid function before IFN therapy. Anti-thyroid stimulating hormone (TSH) receptor antibodies became positive in all 4 patients. Since there may have been a causal relationship between IFN therapy and the onset or aggravation of thyroid dysfunction, IFN therapy should be administered with caution.

Thyroid Dysfunction Induced by Interferon Therapy for the Treatment of Hepatitis Type C. A Report of 4 Cases.