Clinical Research Directory

Evaluation of Patients With Systemic Sclerosis Without Specific or Associated Autoantibodies

Sponsor: Central Hospital, Nancy, France

Summary

Systemic sclerosis (SSc) is a complex systemic autoimmune disease with variable phenotype and prognosis. Autoantibodies are important diagnostic biomarkers in SSc. More than 90% of patients with SSc had anti-nuclear antibodies. Autoantibodies specific to SSc (anti-topoisomerase I antibodies, anti-centromeres, anti-RNA polymerase III, anti-Th/To, anti-fibrillarin, anti-NOR90) or associated with overlap syndromes (anti-RNA polymerase III antibodies -PM/Scl, anti-KU, anti-U1RNP, anti-TRIM21) are detected in most patients. Excluding anti-TRIM21 antibodies, autoantibodies are usually mutually exclusive and are associated with distinct phenotypes. Around 5 to 10% of patients with SSc have no autoantibodies detectable with routine biological tests. Recently, new autoantibody specificities have been described in SSc (anti-eIF2B, anti-RuvBL1/2, anti-BICD2, anti-U11/U12 RNP antibodies). "Seronegative" patients could represent new specificities of autoantibodies (unknown or not currently routinely evaluated) associated with different phenotypes of the disease. Primary objective is to compare the phenotype of patients with systemic sclerosis with or without detectable specific or associated autoantibodies. Secondary objectives are: * to determine homogeneous groups of patients with systemic sclerosis without detectable specific or associated autoantibodies * to compare the phenotype of patients with systemic sclerosis without detectable specific or associated autoantibodies according to anti-nuclear antibodies status

Official title: Phenotypic Evaluation of Patients With Systemic Sclerosis Without Specific or Associated Autoantibodies

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