Specific antinuclear antibodies and clinical features in 180 patients with Systemic Lupus Erythematosus
Keywords:
autoantibodies, clinical features, Cubans, systemic erythematous lupusAbstract
Objective: to determine the prevalence of the most frequent antinuclear antibody reactivities and their associations with clinical features in Cuban patients with systemic erythematous lupus.
Methods: clinical data present during the last year were obtained from 180 consecutive patients with systemic erythematous lupus. Serum samples were screened for seven autoantibodies (anti–double stranded DNA (anti-dsDNA), anti-nucleosome (anti-Nuc), anti-Sm, anti-RNP, anti-Ro, anti-La, and anti-topoisomerase 1 (anti-Topo 1) by ELISA. To determine associations between autoantibodies and clinical features, x2 or Fisher’s exact tests were used.
Results: the Anti-Nuc antibodies were the most frequent in systemic erythematous lupus patients (75.0 %). The anti-Nuc antibodies were strongly associated with neurological (p<0.001) and joint involvement (p<0.001), the anti-dsDNA with cytopenia, and the anti-Sm and anti-RNP with neurological involvement (p < 0.001). The most associated marker with renal involvement was low serum C4 (p < 0.001). Cytopenia was associated with several distinct autoantibody specificities (anti-Nuc, anti-dsDNA, anti-Sm, anti-RNP and anti-Topo 1), while no association was detected between mucocutaneous lesions and the presence of serological markers.
Conclusion: anti-Nuc, anti-dsDNA, anti-Smand anti-RNP antibodies were strongly associated with several clinical features in systemic erythematous lupus patients. These findings offer meaningful information to improve the clinical management of Cuban patients with systemic erythematous lupus.
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