[Hepatitis C virus infection and thyroid diseases].

Area of Science:

• Hepatology
• Endocrinology
• Immunology

Background:

• Hepatitis C virus (HCV) infection is associated with a significant prevalence of thyroid autoimmunity.
• Interferon alpha therapy for chronic hepatitis C can induce various thyroid dysfunctions, primarily hypothyroidism.
• The interplay between HCV, thyroid autoimmunity, and interferon treatment requires further investigation.

Purpose of the Study:

• To review the prevalence of thyroid autoimmunity in HCV-infected patients.
• To examine the impact of interferon alpha treatment on thyroid function in chronic hepatitis C.
• To explore the relationship between HCV infection and autoimmune thyroid diseases.

Main Methods:

• Literature review of studies on HCV infection and thyroid diseases.
• Analysis of data on anti-thyroid auto-antibody prevalence in HCV patients.
• Evaluation of clinical presentations and outcomes of interferon-induced thyroid dysfunction.

Main Results:

• Anti-thyroid auto-antibodies are found in 4.6-15% of HCV patients, particularly in females.
• Interferon alpha treatment causes thyroid dysfunction in 3-15% of cases, with hypothyroidism being more common.
• Thyroid dysfunction can manifest during or after interferon treatment, with immunological mechanisms implicated.

Conclusions:

• Further clinical studies are essential to elucidate the links between HCV infection and thyroid autoimmunity.
• Identifying risk factors for thyroid dysfunction during interferon alpha therapy is crucial.
• Basic research is needed to understand the effects of HCV and interferon on thyroid autoimmunity and function.