Anti-SSA and anti-SSB antibodies are most characteristic of which condition?

• A. Rheumatoid arthritis
• B. Sjögren's syndrome
• C. Systemic lupus erythematosus
• D. ANCA vasculitis

Answer: (B)

Anti-SSA (Ro) and anti-SSB (La) antibodies are classic markers of Sjögren's syndrome. This autoimmune condition primarily targets exocrine glands, leading to reduced tear and saliva production and causing dry eyes (keratoconjunctivitis sicca) and dry mouth. The presence of these antibodies reflects B-cell–driven autoimmunity against ribonucleoprotein components and is strongly associated with Sjögren's. They can appear in some patients with other autoimmune diseases, especially SLE, but their association is strongest with Sjögren's.

Clinically, Sjögren's is evaluated with tests such as the Schirmer test for tear production and sometimes a lip biopsy showing focal lymphocytic sialadenitis. Management focuses on symptomatic relief with artificial tears and saliva substitutes, plus agents like pilocarpine or cevimeline for gland stimulation, and monitoring for potential complications like lymphoma.

Rheumatoid arthritis is more characteristically linked to anti-CCP and RF antibodies, while SLE is more associated with anti-dsDNA and anti-Smith antibodies, and ANCA vasculitis with specific ANCA patterns.