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Arthritis Care Res (Hoboken). 2019 Sep 17. doi: 10.1002/acr.24071. [Epub ahead of print]

Association of Seropositivity and Mortality in Rheumatoid Arthritis and the Impact of Treatment With Disease-Modifying Antirheumatic Drugs.

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Bristol-Myers Squibb, Princeton, New Jersey, USA.
Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital, Boston, Massachusetts, USA.



Seropositivity for anti-citrullinated protein antibody (ACPA)/rheumatoid factor (RF) in rheumatoid arthritis (RA) is associated with increased overall mortality; however, association between antibody titers and mortality is not well-established. Investigating relationships between antibody titers and mortality may clarify their role in RA pathogenesis. This study evaluated association of antibody titers with mortality and its modification by disease-modifying antirheumatic drugs (DMARDs).


Eligible patients with established RA were identified through administrative claims data linked to laboratory results (2005-2016). Patients were categorized by positive status for ACPA/RF, or both. Patients were further divided into groups by autoantibody titers. DMARD-exposed patients were categorized into biologic (b)DMARD and conventional (c)DMARD subcohorts. Crude mortality rates/1000 patient-years and Kaplan-Meier curves were compared between antibody categories. Adjusted Cox proportional hazard regression and sensitivity (propensity-matched patients) analyses were conducted.


Overall, 53,849 and 79,926 patients had evaluable ACPA and RF status, respectively. For both autoantibodies, mortality rates were significantly higher in seropositive versus seronegative patients (risk increase of 48.0% and 44.0% in ACPA- and RF-positive patients, respectively; p<0.001 each). Mortality rates were greatest in patients with higher versus lower autoantibody titers (ACPA, hazard ratio [HR] 1.60; 95% confidence interval [CI] 1.45-1.76; RF, HR 1.78; 95% CI 1.66-1.91). In cDMARD-exposed patients, HRs were higher in seropositive versus seronegative cohorts; in bDMARD-exposed patients, there was no difference in mortality by serostatus.


Elevated ACPA/RF titers were independently associated with increased mortality among patients with RA, and persisted in patients treated with cDMARDs but not with bDMARDs.


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