Abstract
Summary
During the first year of Prospective Observational Scientific Study Investigating Bone Loss Experience (POSSIBE US™), many women transitioned (i.e., discontinued or switched) from their baseline osteoporosis medication. Participants not on stable therapy at entry, with side effects, and with poor physical status were at higher risk of transitioning. Understanding factors associated with persistence may lead to improved outcomes.
Introduction
Postmenopausal osteoporosis (PMO) medication use patterns may differ by treatment history and drug class. We describe these patterns among patients in primary care settings using patient-reported data.
Methods
Data from 3,006 participants of the POSSIBLE US™ were used to estimate the probability of a baseline PMO medication transition (i.e., discontinuation or switch) and hazard ratios (HRs) for predictors of these transitions.
Results
One year after study entry, the probability of persisting with a baseline medication was 66% (95% CI: 64–68%). After adjusting for age and osteoporosis diagnosis, factors at entry independently associated with a higher risk of baseline medication transition were treatment status cohort, side effect severity, and OPAQ-SV physical function score. Compared to participants stable on therapy at entry, others had a higher risk, ranging from HR = 1.59 (95% CI: 1.36–1.85) for those new to therapy to HR = 2.00 (95% CI: 1.27–3.15) for those who recently augmented therapy at entry. Participants reporting moderate (HR = 1.31, 95% CI: 1.09–1.57) or severe (HR = 1.88, 95% CI: 1.49–2.39) side effects had a higher risk than those not reporting side effects. Participants reporting Osteoporosis Assessment Questionnaire-Short Version physical function scores in the lowest tertile had a higher risk (HR = 1.27, 95% CI: 1.07–1.52) than those reporting scores in the highest tertile.
Conclusion
Baseline osteoporosis medication transitions were common in the first year of POSSIBLE US™. Participants not on stable therapy at entry, or who reported severe side effects, or had poor physical health status were at higher risk for these transitions.
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Acknowledgments
The authors would like to acknowledge the other members of the POSSIBLE US™ Steering Committee: Elizabeth Barrett-Connor, Ted Ganiats, Marc Hochberg, Barbara Lukert, Robert Recker, Robert Rubin, and David Macarios. In addition, we are grateful for the methodologic and data analysis contributions of Mike Gao, Aalok Nadkar, Michael Damiata, and Richard Baumann. We would also like to acknowledge the REGISTRAT, Inc. staff that assisted with the implementation of this study and ongoing data collection as well as Michelle N Bradley of Amgen Inc. who provided editorial assistance. Funding for this study was provided by Amgen Inc., Thousand Oaks, CA USA.
Conflicts of interest
This study was funded by Amgen Inc., Thousand Oaks, CA, USA. Anna Tosteson provides consulting services to Amgen Inc. and Eli Lilly & Co. Thy P Do and Mary S Anthony are employees of Amgen Inc. Sally Wade provides consulting services to Amgen Inc. Robert W Downs receives research funding from and provides consulting services to Amgen Inc. The authors agree to allow the journal to review the primary data if requested.
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Tosteson, A.N.A., Do, T.P., Wade, S.W. et al. Persistence and switching patterns among women with varied osteoporosis medication histories: 12-month results from POSSIBLE US™. Osteoporos Int 21, 1769–1780 (2010). https://doi.org/10.1007/s00198-009-1133-5
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DOI: https://doi.org/10.1007/s00198-009-1133-5