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Research ArticleArticle

Systemic Lupus Erythematosus Features in Rheumatoid Arthritis and Their Effect on Overall Mortality

MURAT ICEN, PAULO J. NICOLA, HILAL MARADIT-KREMERS, CYNTHIA S. CROWSON, TERRY M. THERNEAU, ERIC L. MATTESON and SHERINE E. GABRIEL
The Journal of Rheumatology January 2009, 36 (1) 50-57; DOI: https://doi.org/10.3899/jrheum.080091
MURAT ICEN
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PAULO J. NICOLA
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HILAL MARADIT-KREMERS
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CYNTHIA S. CROWSON
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TERRY M. THERNEAU
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ERIC L. MATTESON
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SHERINE E. GABRIEL
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  • For correspondence: gabriel.sherine@mayo.edu
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Abstract

Objective

Features of systemic lupus erythematosus (SLE) are commonly observed in patients with rheumatoid arthritis (RA). However, their frequency and clinical significance are uncertain. We examined the frequency of SLE features in RA and their effect on overall mortality.

Methods

We assembled a population-based incidence cohort of subjects aged ≥ 18 years first diagnosed with RA [1987 American College of Rheumatology (ACR) criteria] between 1955 and 1995. Information regarding disease characteristics, therapy, comorbidities, and SLE features (1982 ACR criteria) were collected from the complete inpatient and outpatient medical records. Cox regression models were used to estimate the mortality risk associated with lupus features.

Results

The study population comprised 603 subjects with incident RA (mean age 58 yrs, 73% women) with a mean followup time of 15 years. By 25 years after RA incidence, ≥ 4 SLE features were observed in 15.5% of the subjects with RA. After adjustment for age and sex, occurrence of ≥ 4 SLE features was associated with increased overall mortality [hazard ratio (HR) 5.54, 95% confidence interval (CI) 3.59–8.53].With further adjustment for RA characteristics, therapy, and comorbidities, the association weakened but remained statistically significant (HR 2.56, 95% CI 1.60–4.08). After adjustment for age, sex, RA characteristics, therapy, and comorbidities, thrombocytopenia (2.0, 95% CI 1.2, 3.1) and proteinuria (1.8, 95% CI 1.3, 2.6) were significantly associated with mortality.

Conclusion

SLE features were common in RA, given sufficient observation time. Subjects with RA who developed ≥ 4 SLE features had an increased risk of death. Proteinuria and thrombocytopenia were individually associated with an increased mortality risk.

Key Indexing Terms:
  • RHEUMATOID ARTHRITIS
  • SYSTEMIC LUPUS ERYTHEMATOSUS
  • MORTALITY

Footnotes

  • Supported in part by a grant from the National Institutes of Health, NIAMS (R01 AR46849), and the National Institutes of Health (AR-30582) US Public Health Service. Dr. Nicola was funded by a fellowship from the Fundação para a Ciência e Tecnologia, Portugal (SFRH/BD/17282/2004).

    • Accepted for publication July 3, 2008.
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The Journal of Rheumatology
Vol. 36, Issue 1
1 Jan 2009
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Systemic Lupus Erythematosus Features in Rheumatoid Arthritis and Their Effect on Overall Mortality
MURAT ICEN, PAULO J. NICOLA, HILAL MARADIT-KREMERS, CYNTHIA S. CROWSON, TERRY M. THERNEAU, ERIC L. MATTESON, SHERINE E. GABRIEL
The Journal of Rheumatology Jan 2009, 36 (1) 50-57; DOI: 10.3899/jrheum.080091

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Systemic Lupus Erythematosus Features in Rheumatoid Arthritis and Their Effect on Overall Mortality
MURAT ICEN, PAULO J. NICOLA, HILAL MARADIT-KREMERS, CYNTHIA S. CROWSON, TERRY M. THERNEAU, ERIC L. MATTESON, SHERINE E. GABRIEL
The Journal of Rheumatology Jan 2009, 36 (1) 50-57; DOI: 10.3899/jrheum.080091
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