PMID: 6975630Oct 1, 1981Paper

Antibodies to Sm in patients with systemic lupus erythematosus. Correlation of Sm antibody titers with disease activity and other laboratory parameters

Arthritis and Rheumatism
F A BaradaR P Taylor

Abstract

Thirty patients with systemic lupus erythematosus (SLE) were studied over a 2.5-year period. The group was divided into 14 patients with antibodies to Sm and a control group that failed to exhibit antibodies to Sm over the study period. The titer of antibodies to Sm fluctuated in all 14. A rising titer of antibodies to Sm 1) predicted a flare disease in 50% an 2) correlated with an exacerbation of disease in 60%. Patients with antibodies to Sm had a comparable incidence of severe disease, renal disease, and central nervous system disease. They exhibited significantly more leukopenia and antibodies to non-Sm, non-RNP extractable nuclear antigen. In only 1 patient, a rise in titer of antibodies to Sm did not correlate with or predict a disease flare in contradistinction to other serologic markers of SLE, specifically antibodies to double-stranded DNA and cryoglobulins. Though infrequently detected, antibodies to Sm can help in the management of patients with SLE.

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