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Risk factors for progression and prognosis of rheumatoid arthritis–associated interstitial lung disease: single center study with a large sample of Chinese population

  • Qiang Fu
  • Li Wang
  • Luling Li
  • Yifan Li
  • Ran Liu
  • Yi Zheng
Original Article
  • 13 Downloads

Abstract

Background

Factors associated with progression and survivals in rheumatoid arthritis–associated interstitial lung disease (RA-ILD) have not been described in a large center China cohort.

Methods

Seven-hundred and ninety-one consecutive RA patients who completed lung HRCT were considered as potential participants in this retrospective cohort study. Determinants of ILD progression were identified through multivariable logistic analysis. Cox hazards analysis was used to determine significant variables associated with survival.

Results

Of 307 patients diagnosed with RA-ILD, 266 were finally included. The 3-year survival rate of RA-ILD patients was 81.24%, and the 5-year survival rate was 69.71%. A total of 82 deaths occurred during follow-up, of which 56 died of respiratory failure due to ILD progression and/or pneumonia while 14 with malignancies (8 with lung cancer). Logistic regression analysis showed that anti-CCP antibody high titer positive (OR: 4.03, 95% CI: 1.04–15.69) and DLCO% < 45% (OR: 8.31, 95% CI: 2.17–31.75) were independent risk factors for the ILD progression. Cox hazards analysis revealed that advanced age (> 60 years old) of RA-ILD diagnosis (HR: 2.32, 95% CI: 1.27–4.25) and extensive lung involvement on HRCT (HR: 2.19, 95% CI: 1.24–3.87) were associated with worse survival. Treatment with cyclophosphamide (HR: 0.43, 95% CI: 0.26–0.69) was associated with better survival.

Conclusions

In RA-ILD patients, anti-CCP antibody high titer positive and DLCO% < 45% are risk factors for ILD progression. Advanced age and extensive lung involvement on HRCT, rather than the baseline UIP pattern, independently predict mortality after controlling for potentially influential variables. Furthermore, cyclophosphamide treatment helps to improve the prognosis in real-world experience.

Keywords

Interstitial lung disease Prognosis Progression Rheumatoid arthritis Risk factor 

Notes

Acknowledgments

We would like to thank Shuai Gao (experienced radiologist, Department of Radiology, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, China) for his assistance in identifying interstitial lung disease for the present study.

Author contributions

Yi Zheng had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis. Qiang Fu, Li Wang, and Yi Zheng were involved in the design of the study; Qiang Fu, Luling Li, Yifan Li, and Ran Liu selected the patients and acquired the data; Qiang Fu and Li Wang analyzed and interpreted the data; authors Qiang Fu and Li Wang jointly completed the writing, and Luling Li, Yifan Li, Ran Liu, and Yi Zheng were substantially involved in revising the article.

Compliance with ethical standards

Conflict of Interest

The authors declare that they have no competing interests.

Disclosures

None.

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Copyright information

© International League of Associations for Rheumatology (ILAR) 2018

Authors and Affiliations

  • Qiang Fu
    • 1
  • Li Wang
    • 2
  • Luling Li
    • 3
  • Yifan Li
    • 4
  • Ran Liu
    • 4
  • Yi Zheng
    • 4
  1. 1.Department of Rheumatology and ImmunologyThe First Affiliated Hospital of University of South ChinaHengyangChina
  2. 2.Department of Radiology, Beijing Chao-Yang HospitalCapital Medical UniversityBeijingChina
  3. 3.Department of Rheumatology and ImmunologyBeijing Chao-Yang Hospital West Hospital Affiliated to Capital Medical UniversityBeijingChina
  4. 4.Department of Rheumatology and Immunology, Beijing Chao-Yang Hospital West HospitalCapital Medical UniversityBeijingChina

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