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Clinical heterogeneities and prognoses of patients with myositis specific antibody negative dermatomyositis: a retrospective study in China


1, 2, 3, 4, 5, 6, 7, 8, 9, 10

 

  1. Department of Rheumatology, Key Laboratory of Myositis, China-Japan Friendship Hospital, Beijing, China.
  2. School of Statistics, Renmin University of China, Beijing, China.
  3. Department of Rheumatology, Key Laboratory of Myositis, China-Japan Friendship Hospital, Beijing, China.
  4. Key laboratory of advanced optoelectronic quantum architecture and measurement, ministry of education, School of Physics, Beijing Institute of Technology, Beijing, China.
  5. Department of Radiology, China-Japan Friendship Hospital, Beijing, China.
  6. Department of Rheumatology, Key Laboratory of Myositis, China-Japan Friendship Hospital, Beijing, China.
  7. Department of Rheumatology, Key Laboratory of Myositis, China-Japan Friendship Hospital, Beijing, China.
  8. Department of Radiology, China-Japan Friendship Hospital, Beijing, China.
  9. Department of Rheumatology, Key Laboratory of Myositis, China-Japan Friendship Hospital, Beijing, China.
  10. Department of Rheumatology, Key Laboratory of Myositis, China-Japan Friendship Hospital, Beijing, China. guochunwang@hotmail.com

CER14849
2022 Vol.40, N°2
PI 0284, PF 0291
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PMID: 34796847 [PubMed]

Received: 31/05/2021
Accepted : 25/10/2021
In Press: 12/11/2021
Published: 25/02/2022

Abstract

OBJECTIVES:
The clinical features of myositis specific antibody negative dermatomyositis (MSA negative DM) varied greatly, and there were few reports in the literatures. This study aimed to describe and expand the clinical phenotypes and prognoses of MSA negative DM patients.
METHODS:
MSA negative DM patients were identified from January 2010 to June 2020. We retrospectively reviewed the clinical features and laboratory data. The survival status was followed up until July 31. 2020 SPSS version 21.0 and R version 3.6.1 software were used for the statistical analyses.
RESULTS:
A total of 97 MSA negative DM patients were enrolled. The most common type of rashes was heliotrope rash (80.4%). More than half of the patients (55.7%) had interstitial lung disease (ILD), and seven of them developed rapid progressive ILD. There were eleven patients with tumours. During the follow-up, twelve patients died, of whom 5 (41.7%) died due to infection. Two phenotypes of MSA negative DM patients were identified by cluster analysis. Patients in cluster 1 developed muscle weakness, mechanic’s hands, arthritis, and ILD more frequently. Patients in cluster 2 had a higher incidence of heliotrope rashes. Patients in cluster 1 tended to have worse prognoses, wherein the 1-year and 5-year survival rates (81.1% and 78.4%, respectively) were lower than those in cluster 2 (97.6% and 95.2%, respectively), with p value 0.04 and 0.056 respectively.
CONCLUSIONS:
Through cluster analysis, different clinical phenotypes of MSA negative DM patients were determined. The prognoses of the two subgroups were different in terms of survival rate and cause of death.

DOI: https://doi.org/10.55563/clinexprheumatol/t7942l

Rheumatology Article