JOURNAL ARTICLE
META-ANALYSIS
RESEARCH SUPPORT, NON-U.S. GOV'T
REVIEW
SYSTEMATIC REVIEW
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Malignancies associated with tumour necrosis factor inhibitors in registries and prospective observational studies: a systematic review and meta-analysis.

OBJECTIVES: This project was undertaken to assess the risk of malignancy in patients with rheumatoid arthritis treated with tumour necrosis factor inhibitors (TNFi) in clinical practice, as recorded in prospective, observational studies.

METHODS: The authors undertook comprehensive searches of MEDLINE, EMBASE, the Cochrane Database of Systematic Reviews and American College of Rheumatology, European League against Rheumatism and British Society for Rheumatology conference abstracts according to a prespecified protocol.

RESULTS: The searches identified 2039 full-text papers and 1979 conference abstracts, of which 21 full texts and eight abstracts met the inclusion criteria. The pooled estimate for the risk of all-site malignancy from seven studies was 0.95 (95% CI 0.85 to 1.05). Two studies reported there was no evidence that longer exposure to TNFi agents increased the risk of malignancy. In patients with previous malignancies there was a higher risk of a new/recurring malignancy. This risk was not increased further by exposure to TNFi, although CI were wide. Results from four studies showed that patients treated with TNFi have a significantly increased risk of developing a non-melanoma skin cancer (1.45, 95% CI 1.15 to 1.76). In addition, patients are at an increased risk of developing melanoma, as the pooled estimate from two studies was 1.79 (95% CI 0.92 to 2.67). The pooled estimate for the risk of lymphoma was 1.11 (95% CI 0.70 to 1.51).

CONCLUSIONS: This systematic review and meta-analysis shows that TNFi treatments do not increase the risk of malignancy, particularly lymphoma. However, they do appear to increase the risk of skin cancer, including melanoma.

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