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TNF-α −308 G/A polymorphism and responsiveness to TNF-α blockade therapy in moderate to severe rheumatoid arthritis: a systematic review and meta-analysis

Abstract

Although tumor necrosis factor-α (TNF-α) blockade is a very effective therapy for rheumatoid arthritis (RA), not all patients achieve a favorable outcome. The objective of this study was to determine if the common TNF-α variant −308(A) predicts poor response to TNF-α inhibitors in RA patients using meta-analysis. Studies were identified using MEDLINE and EMBASE. Data were extracted based on DAS28 or achieving at least American College of Rheumatology 20 response. A total of nine studies met the inclusion criteria representing a total of 692 RA patients. There was no significant heterogeneity among study effect sizes (P=0.36). The frequency of the A allele was 22% (119/531) in responders and 37% (60/161) in non-responders. The odds of having the A allele was lower in responders versus non-responders (odds ratio (OR)=0.43, 95% confidence intervals (CI): 0.28−0.68, P=0.000245), irrespective of the TNF-α inhibitor prescribed, indicating that the −308(A) variant predicts poor response to TNF-α inhibitors. The clinical utility of prospectively genotyping for this variant when initiating anti-TNF-α therapy for RA should now be formally assessed.

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Acknowledgements

JB would like to acknowledge funding from the Canadian Institute of Health Research, CIHR (Grant. no. 84392) and PR was supported by grants from CIHR and the Arthritis Society of Canada.

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O'Rielly, D., Roslin, N., Beyene, J. et al. TNF-α −308 G/A polymorphism and responsiveness to TNF-α blockade therapy in moderate to severe rheumatoid arthritis: a systematic review and meta-analysis. Pharmacogenomics J 9, 161–167 (2009). https://doi.org/10.1038/tpj.2009.7

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