ArticleBeijing da xue xue bao. Yi xue ban = Journal of Peking University. Health sciences2025
[Rheumatic disease spectrum and immunological profile of anti-PM/Scl antibodies in idiopathic inflammatory myopathies].
Article in Beijing da xue xue bao. Yi xue ban = Journal of Peking University. Health sciences, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
objectiveTo systematically investigate the rheumatic disease spectrum associated with anti-PM/Scl antibodies and to clarify their clinical significance in idiopathic inflammatory myopathies (IIM).
methodsPatients who were tested positive for anti-PM/Scl antibodies by immunoblotting at Peking University People' s Hospital from January 2016 to December 2024 were enrolled. Clinical and immunolo gical data were systematically collected and compared across the subgroups defined by anti-PM/Scl75, anti-PM/Scl100, or dual antibody positivity.
resultsA total of 422 anti-PM/Scl-positive patients were enrolled. Among them, 83.2% (351/422) were diagnosed with connective tissue disease (CTD), 7.8% (33/422) were not diagnosed with CTD, and 9.0% (38/422) had an undetermined clinical diagnosis. Among 422 patients, most commonly represented by IIM (19.7%), systemic sclerosis (SSc, 14.2%), overlap syndrome (11.8%), undifferentiated CTD (UCTD, 10.4%), rheumatoid arthritis (6.9%), Sjögren syndrome (6.4%), and systemic lupus erythematosus (6.2%), the remaining diseases accounting for 24.4%. Within the IIM subgroup, dermatomyositis predominated (74.7%), followed next by anti-synthetase syndrome (21.7%) and immune-mediated necrotizing myopathy (3.6%). Anti-PM/Scl75 antibodies were detected in 52.1% (220/422) of the total patients, anti-PM/Scl100 in 43.6% (184/422), and both in 4.3% (18/422). In the subsequent detailed analysis of the anti-PM/ Scl-positive subgroup, double-positive patients showed a significantly higher prevalence of SSc (38.9%
conclusionAnti-PM/Scl antibodies define a broad disease spectrum encompassing IIM, SSc, overlap syndromes, and UCTD. Dual positivity for anti-PM/Scl75 and anti-PM/Scl100 identifies patients prone to systemic sclerosis and pulmonary involvement, suggesting additive pathogenic effects of the two antibody specificities.
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