Risk of serious bacterial infections among rheumatoid arthritis patients exposed to tumor necrosis factor alpha antagonists
Department of Quantitative Health Sciences
Antibodies, Monoclonal; Antirheumatic Agents; Arthritis, Rheumatoid; Bacterial Infections; Cohort Studies; Female; Health Maintenance Organizations; Humans; Immunocompromised Host; Immunoglobulin G; Immunosuppressive Agents; Methotrexate; Middle Aged; Receptors, Tumor Necrosis Factor; Retrospective Studies; Risk Factors; Tumor Necrosis Factor-alpha; United States
Bioinformatics | Biostatistics | Epidemiology | Health Services Research
OBJECTIVE: To evaluate the risk of serious bacterial infections associated with tumor necrosis factor alpha (TNFalpha) antagonists among rheumatoid arthritis (RA) patients.
METHODS: A retrospective cohort study of US RA patients enrolled in a large health care organization identified patients who received either TNFalpha antagonists or methotrexate (MTX). Administrative data were used to identify hospitalizations with possible bacterial infections; corresponding medical records were abstracted and reviewed by infectious disease specialists for evidence of definite infections. Proportional hazards models evaluated time-dependent infection risks associated with TNFalpha antagonists.
RESULTS: Hospital medical records with claims-identified suspected bacterial infections were abstracted (n=187) among RA patients who received TNFalpha antagonists (n=2,393; observation time 3,894 person-years) or MTX (n=2,933; 4,846 person-years). Over a median followup time of 17 months, the rate of hospitalization with a confirmed bacterial infection was 2.7% among the patients treated with TNFalpha antagonists compared with 2.0% among the patients treated with MTX only. The multivariable-adjusted hazard ratio (HR) of infection among the patients who received TNFalpha antagonists was 1.9 (95% confidence interval [95% CI] 1.3-2.8) compared with patients who received MTX only. The incidence of infections was highest within 6 months after initiating TNFalpha antagonist therapy (2.9 versus 1.4 infections per 100 person-years; multivariable-adjusted HR 4.2, 95% CI 2.0-8.8).
CONCLUSION: The multivariable-adjusted risk of hospitalization with a physician-confirmed definite bacterial infection was approximately 2-fold higher overall and 4-fold higher in the first 6 months among patients receiving TNFalpha antagonists versus those receiving MTX alone. RA patients were at increased risk of serious infections, irrespective of the method used to define an infectious outcome. Patients and physicians should vigilantly monitor for signs of infection when using TNFalpha antagonists, particularly shortly after treatment initiation.
DOI of Published Version
Arthritis Rheum. 2007 Apr;56(4):1125-33. Link to article on publisher's site
Arthritis and rheumatism
Curtis, Jeffrey R.; Patkar, Nivedita M.; Xie, Aiyuan; Martin, Carolyn K.; Allison, Jeroan J.; Saag, Michael S.; Shatin, Deborah; and Saag, Kenneth G., "Risk of serious bacterial infections among rheumatoid arthritis patients exposed to tumor necrosis factor alpha antagonists" (2007). Quantitative Health Sciences Publications and Presentations. 813.