Abstract
Inhibitors of tumor necrosing factor alpha (TNF-a) have proven to be highly effective in the treatment of rheumatoid arthritis (RA). Concerns, however, are raised about the possible association between these treatments and an increased development of malignancies. The objective of this paper was to compare the risk of hematologic and solid malignancies in patients treated for RA with anti-TNF therapy, with the risk in the general population. From January 2000 until January 2012, all RA patients that started treatment with anti-TNF agents were included in this single-center cohort study. The primary outcome of this study was the incidence of malignancy after starting anti-TNF treatment. In our cohort of 365 patients, 34 malignancies were discovered in 30 patients after the start of anti-TNF treatment; 20 patients developed a solid malignancy, 6 a hematologic, 2 a solid and a hematologic malignancy, and 2 patients developed 2 solid malignancies. The overall incidence rate (IR) of malignancy was 1379.1 per 100.000 patient years. The risk or standardized incidence ratio (SIR) of solid malignancy, calculated by comparison with the age-adjusted population in Flanders, was 120.1 in female and 136.7 in male patients. The calculated SIR of hematologic malignancy was 450.8 for women and 473.9 for men. Some immune modulation-related lymphoproliferative disorders regressed spontaneously when stopping TNF blockers. Overall, the malignancy risk in our rheumatoid arthritis patients treated with anti-TNF therapy was slightly higher than in the normal population; the risk of hematologic malignancies was more important.
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Acknowledgments
The authors thank Patricia Berghman for her administrative support, Dirk Teuwen for his critical comments, and Flip Van Oyen for his IT support.
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The authors declare that they have no competing interests.
Authors’ contributions
Nathalie Berghen and Laure-Anne Teuwen collected, analyzed and interpreted the data and drafted the manuscript. Patrick Verschueren and Rene Westhovens participated in the design of the study, interpreted the data and revised the manuscript critically. All authors read and approved the final manuscript.
The study was approved by the local Ethical Committee: the Medical Ethical Committee of the Leuven University Hospital.
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Nathalie Berghen and Laure-Anne Teuwen contributed equally to this work.
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Berghen, N., Teuwen, LA., Westhovens, R. et al. Malignancies and anti-TNF therapy in rheumatoid arthritis: a single-center observational cohort study. Clin Rheumatol 34, 1687–1695 (2015). https://doi.org/10.1007/s10067-015-3026-7
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DOI: https://doi.org/10.1007/s10067-015-3026-7