Abstract
Two recent papers that examined the association between oral bisphosphonates and the risk of esophageal cancer reported seemingly discrepant findings, despite both studies using data from the UK General Practice Research Database, from similar time periods. Each paper set out brief conclusions within their abstracts, generating two opposing impressions: that the risk of incident esophageal cancer is not significantly increased with bisphosphonate use, or that the risk is increased when bisphosphonates have been prescribed ten or more times, or for longer than 5 years. Of course, the latter conclusion was more widely reported in the popular press, and with patients arriving at the clinic wanting to discuss the reports, clinicians must be able to interpret the existing evidence correctly. In this article we discuss important methodological issues regarding the two observational studies, define areas of consensus and discrepancy, examine possible bias and confounding, and condense the results into a clinically useful summary.
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Acknowledgements
W. G. Dixon is supported by an MRC Clinician Scientist Fellowship (G0902272), and D. H. Solomon receives salary support from the National Institutes of Health of the USA (AR055989).
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W. G. Dixon and D. H. Solomon contributed equally to all aspects of the preparation of this manuscript.
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D. H. Solomon receives a research grant from Amgen for the study of rheumatoid arthritis. W. G. Dixon declares no competing interests.
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Dixon, W., Solomon, D. Bisphosphonates and esophageal cancer—a pathway through the confusion. Nat Rev Rheumatol 7, 369–372 (2011). https://doi.org/10.1038/nrrheum.2011.60
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DOI: https://doi.org/10.1038/nrrheum.2011.60
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