Antinuclear Antibody-negative Systemic Lupus Erythematosus. I. Anti-Ro(SSA) and Anti-La(SSB) Antibodies
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Anti-Ro(SSA) and anti-La(SSB) antibodies are found in approximately 25% of systemic lupus erythematosus patients. These antibodies are also detected in lupus patients who fail to demonstrate a significant antinuclear antibody (ANA) titer when mouse liver is employed as the substrate. Approximately 5% to 10% of systemic lupus patients are in this category. These ANA-negative, Ro(SSA)-positive lupus patients generally demonstrate a prominent widespread photosensitive dermatitis and are frequently initially seen and evaluated by a dermatologist.
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