Interferon-induced thyroiditis during treatment of chronic hepatitis C

Endokrynol Pol. 2012;63(1):66-70.

Abstract

Thyroid function disorders affect between 5% and 15% of patients treated with IFNα and RBV for chronic hepatitis C. Women and patients with thyroid peroxidase antibodies (TPOAb) found before the treatment are at risk of developing the disorders (46.1% vs. 5.4%). The spectrum of IFNα-induced thyroiditis (IIT) includes two groups. Disorders with an autoimmune background are: presence of thyroid autoantibodies without clinical disease, Hashimoto's disease and Graves' disease. The second group comprises diseases caused by the direct toxic effect of IFNα on the thyroid gland, i.e. destructive thyroiditis and non-autoimmune hypothyroidism. Thyroid diseases are not an absolute contraindication for IFNα and RBV therapy. In patients diagnosed with thyroid dysfunction, before the antiviral therapy it is necessary to achieve euthyreosis. Thyroid function disorders may occur at any moment of the therapy. The earliest have been observed in the 4th week of treatment, and the latest 12 months after its termination. During the therapy, in order to diagnose IIT early, it is recommended to determine TSH level every 2-3 months depending on the presence of TPOAb before the treatment. The diagnosis and treatment of thyroid function disorders should be conducted in co-operation with an endocrinologist.

MeSH terms

  • Age Factors
  • Algorithms
  • Antithyroid Agents / therapeutic use
  • Antiviral Agents / adverse effects*
  • Autoantibodies / drug effects
  • Autoantibodies / immunology
  • Diagnosis, Differential
  • Drug Interactions
  • Female
  • Graves Disease / chemically induced*
  • Graves Disease / drug therapy
  • Graves Disease / immunology
  • Hashimoto Disease / chemically induced*
  • Hashimoto Disease / drug therapy
  • Hashimoto Disease / immunology
  • Hepatitis C, Chronic / drug therapy*
  • Humans
  • Interferon-alpha / adverse effects*
  • Male
  • Ribavirin / adverse effects
  • Risk Factors
  • Sex Factors
  • Thyroid Gland / drug effects
  • Thyroid Gland / immunology
  • Thyroiditis / chemically induced*
  • Thyroiditis / drug therapy
  • Thyroiditis / immunology

Substances

  • Antithyroid Agents
  • Antiviral Agents
  • Autoantibodies
  • Interferon-alpha
  • Ribavirin