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Incidence and risk of osteonecrosis of the jaw among the Taiwan osteoporosis population

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Abstract

Summary

Evidence of the incidence and risk of osteonecrosis of the jaw (ONJ) in Asian osteoporosis populations receiving different osteoporosis medications is lacking. We found that there is no excess incidence of or risk for ONJ in osteoporosis patients >50 years old using alendronate as compared with patients using raloxifene or calcitonin under real-world conditions in Taiwan.

Introduction

To provide information on ONJ in Asian populations, this study compares the incidence and risk of ONJ between patients receiving alendronate and those receiving non-bisphosphonate osteoporosis medications in Taiwan.

Methods

Enrollees in the National Health Insurance Research Database (NHIRD) from 2003 to 2007, aged above 50 years, with vertebral/hip fracture, and new to osteoporosis therapy were recruited. Patients with Paget’s disease or cancer during the baseline period were excluded. Patients were classified into either the alendronate or the calcitonin/raloxifene (control) group according to their exposure during follow-up. Previously proposed possible ONJ diagnosis codes were adopted as potential ONJ cases, but qualifying cases also had a repeated ONJ diagnosis within 8 weeks of the first diagnosis and received one or more broad-spectrum oral antibiotics. Cox modeling compared the risk of ONJ between the alendronate and the control groups, which were matched using propensity scores. Results were examined in series sensitivity analyses, including different cumulative dose groups.

Results

We found 25 potential ONJ cases in the alendronate (N = 18,030) and 21 in the control groups (N = 25,615). Over the 6-year follow-up period, no increased risk of ONJ in the alendronate group in the original (hazard ratio (HR), 0.87; 95 % confidence interval (CI), 0.47–1.58) or propensity score-matched cohorts (HR, 0.86; 95 % CI, 0.44–1.69) was found. All comparison groups exhibited a similar incidence of ONJ, ranging from 6.9 to 8.2/10,000 person-years.

Conclusion

Under real-world conditions, there is no excess risk for ONJ in osteoporosis patients >50 years old using alendronate as compared with patients using raloxifene or calcitonin.

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Acknowledgments

This study was supported in part by grants from the Department of Health, Executive Yuan, Taiwan and National Science Council, Taiwan (NSC 99-2320-B-006-016-MY3)

Conflicts of interest

None.

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Authors and Affiliations

  1. Institute of Clinical Pharmacy and Pharmaceutical Sciences, College of Medicine, National Cheng Kung University, No.1 University Road, Tainan, 70101, Taiwan

    T.-C. Lin & Y.-H. Kao Yang

  2. Department of Orthopedics, College of Medicine, National Cheng Kung University, Tainan, Taiwan

    C.-Y. Yang

  3. Department of Orthopedics, National Cheng Kung University Hospital, Tainan, Taiwan

    C.-Y. Yang

  4. Health Outcome Research Center, National Cheng Kung University, Tainan, Taiwan

    T.-C. Lin, Y.-H. Kao Yang & S.-J. Lin

  5. Department of Pharmacy Administration, University of Illinois at Chicago, Chicago, IL, USA

    S.-J. Lin

Authors
  1. T.-C. Lin
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  2. C.-Y. Yang
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  3. Y.-H. Kao Yang
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  4. S.-J. Lin
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Correspondence to Y.-H. Kao Yang.

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Lin, TC., Yang, CY., Kao Yang, YH. et al. Incidence and risk of osteonecrosis of the jaw among the Taiwan osteoporosis population. Osteoporos Int 25, 1503–1511 (2014). https://doi.org/10.1007/s00198-014-2624-6

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  • DOI: https://doi.org/10.1007/s00198-014-2624-6

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