Abstract
Pediatric mixed connective tissue disease (MCTD) is a subgroup of overlap syndromes. We aimed to compare the characteristics and outcomes in children with MCTD and other overlap syndromes. All MCTD patients met either Kasukawa or Alarcon-Segovia and Villareal criteria. The patients with other overlap syndromes had the features of ≥ 2 autoimmune rheumatic diseases but did not meet MCTD diagnostic criteria. Thirty MCTD (F/M = 28/2) and thirty (F/M = 29/1) overlap patients were included (disease onset < 18 years). The most prominent phenotype at disease onset and the last visit was systemic lupus erythematosus (SLE) in the MCTD group; juvenile idiopathic arthritis and dermatomyositis/polymyositis, respectively, in the overlap group. At the last visit, systemic sclerosis (SSc) phenotype was more frequent among MCTD than overlap patients (60% vs. 33.3%; p = 0.038). The frequency of the predominant SLE phenotype had decreased (60% to 36.7%), while predominant SSc phenotype had increased (13.3% to 33.3%) during follow-up in MCTD patients. Weight loss (36.7% vs. 13.3%), digital ulcers (20% vs. 0), swollen hands (60% vs. 20%), Raynaud phenomenon (86.7% vs. 46.7%), hematologic involvement (70% vs. 26.7%), and anti-Sm positivity (29% vs. 3.3%) were more common, while Gottron papules (16.7% vs. 40%) were less frequent among MCTD than overlap patients (p < 0.05). A higher percentage of overlap patients achieved complete remission than MCTD patients (51.7% vs. 24.1%; p = 0.047). The disease phenotype and outcome differ between pediatric MCTD and other overlap syndromes where MCTD may be regarded as a more severe disease. Analyzing these patients could pave the way for early and effective treatment.
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The entire dataset used for this study can be accessed from the corresponding author upon reasonable request.
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Acknowledgements
This study was presented as an abstract at the 28th European Paediatric Rheumatology Congress of the Paediatric Rheumatology European Association (PReS), held in Prague, Czech Republic, on 20-23 September 2022. The abstract of this study was published in the Proceedings of the Congress (https://doi.org/10.1186/s12969-022-00729-z).
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Conceptualization: EDB; methodology: EDB, APK, BÇA, BS, NAA, YB, MKP, EU, ÖK; formal analysis and investigation: EDB, AG, SS, SÖ, ZK, İB, MKC, AT, HES, ES, SD, EC, SC; writing—original draft preparation: EDB; writing—review and editing: EDB, APK, BCA, BS, NAA, YB, MKP, EU, ÖK, SÖ; supervision: SÖ. All co-authors take full responsibility for the integrity and accuracy of all aspects of the work.
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The study protocol was approved by the ethical committee of Hacettepe University (GO 21/925). And, local ethics committee approvals were obtained in the participating centers. The study was performed according to the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments. At the time of hospital admission, all patients/parents provided written informed consent for the use of their data anonymously for academic purposes.
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Batu, E.D., Günalp, A., Şahin, S. et al. Pediatric mixed connective tissue disease versus other overlap syndromes: a retrospective multicenter cohort study. Rheumatol Int 43, 1485–1495 (2023). https://doi.org/10.1007/s00296-023-05300-x
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DOI: https://doi.org/10.1007/s00296-023-05300-x