Thyroid disease in Sjögren's syndrome

Area of Science:

• Rheumatology
• Endocrinology
• Immunology

Background:

• Primary Sjögren's syndrome (pSS) frequently coexists with thyroid disease, particularly autoimmune thyroiditis and subclinical hypothyroidism.
• This association suggests shared genetic or environmental factors and common pathogenic mechanisms.
• Patients with pSS show a higher prevalence of autoimmune thyroid disease, and vice versa.

Purpose of the Study:

• To investigate the frequent association between primary Sjögren's syndrome and thyroid disorders.
• To explore potential shared etiologies, including common antigens and genetic predispositions.
• To highlight the clinical implications of this comorbidity for patient management and research.

Main Methods:

• Retrospective analysis of patient data from 1960 to 2007.
• Review of laboratory data and clinical presentations for diagnoses of pSS and thyroid disease.
• Analysis of autoantibody profiles (antithyroglobulin, anti-thyroid peroxidase, rheumatoid factor, anti-Ro/SSA) and lymphoma risk.

Main Results:

• Autoimmune thyroiditis and subclinical hypothyroidism were the most common thyroid conditions in pSS patients.
• pSS was 10 times more frequent in autoimmune thyroid disease patients; autoimmune thyroiditis was 9 times more frequent in pSS patients.
• Increased risk for thyroid MALT lymphoma (67-fold) and parotid lymphoma (44-fold) associated with pSS and autoimmune thyroiditis.

Conclusions:

• A strong association exists between primary Sjögren's syndrome and autoimmune thyroid disease, likely due to shared antigens and genetic factors.
• Thyroid dysfunction is common in pSS, and patients with thyroid disease should be screened for pSS.
• Further research is needed to elucidate the shared pathogenesis and implications for B cell lymphoma development.