Abstract
Summary
Anti-osteoporosis medication (AOM) use in patients exposed to glucocorticoids is thought to reduce fractures. We found post-menopausal women using glucocorticoids for at least 90 days who also used an AOM within 90 days had 48 % fewer fractures by 1 year and 32 % fewer fractures by 3 years compared to non-AOM users.
Introduction
The purpose of this study is to explore the effectiveness of adherence to quality measures by estimating the effect of anti-osteoporosis medication (AOM) initiation within 90 days after chronic (≥90 days) glucocorticoid (GC) therapy on osteoporotic fracture.
Methods
A new-user cohort was assembled using the MarketScan databases between 2000 and 2012. Included patients were female, age ≥50 at GC initiation, had a first GC fill daily dose ≥10 mg and persisted for at least 90 days. During a 365-day baseline period, patients were excluded for prior GC or AOM (bisphosphonate, denosumab, teriparatide) use, fracture, or cancer diagnosis. Initiators of an AOM in the 14 days pre- or 90 days post-GC fill were characterized as AOM users; those without, AOM non-users. Follow-up began 91 days after GC fill with patients followed until fracture, loss of continuous enrollment, initiation of AOM by AOM non-users, or end of study period. A propensity score was estimated for AOM receipt using all measured covariates and converted to a stabilized inverse probability of treatment weights (IPTW). Weighted hazard ratios (HR) and associated 95 % confidence intervals (95 % CI) were estimated using weighted Cox proportional hazard models.
Results
Of the 7885 women eligible for the study, 12.1 % were AOM users. AOM use was associated with lower fracture incidence: weighted HR of 0.52 (95 % CI 0.29, 0.94) at 1 year and weighted HR of 0.68 (95 % CI 0.47, 0.99) at 3 years.
Conclusions
AOM initiation within 90 days of chronic GC use was associated with a fracture reduction of 48 % at 1 year and 32 % at 3 years.
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Acknowledgments
The database infrastructure used for this project was funded by the Department of Epidemiology, UNC Gillings School of Global Public Health; the Cecil G. Sheps Center for Health Services Research, UNC; the CER Strategic Initiative of UNC’s Clinical Translational Science Award (1 ULI RR025747); and the UNC School of Medicine.
Conflicts of interest
Robert A. Overman, Margret L. Gourlay, Chad L. Deal, and J. Bradley Layton declare that they have no conflicts of interest. Joel F. Farley has received prior consulting support from Daiichi-Sankyo Pharmaceuticals for unrelated research. M. Alan Brookhart has received research support Amgen and has sat on advisory boards for Amgen, Merck, and Pfizer (honoraria received by institution). He has received consulting fees from RxAnte, Inc. and World Health Information Science Consultants, LLC.
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Overman, R.A., Gourlay, M.L., Deal, C.L. et al. Fracture rate associated with quality metric-based anti-osteoporosis treatment in glucocorticoid-induced osteoporosis. Osteoporos Int 26, 1515–1524 (2015). https://doi.org/10.1007/s00198-014-3022-9
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DOI: https://doi.org/10.1007/s00198-014-3022-9