Abstract
Summary
The aim of this study was to examine the effects of bisphosphonate discontinuation on bone metabolism at the spine and hip measured using 18 F-fluoride PET. Bone metabolism at the spine remained stable following discontinuation of alendronate and risedronate at 1 year but increased in the hip in the alendronate group only.
Introduction
Bisphosphonates such as alendronate (ALN) or risedronate (RIS) have persistent effects on spine BMD following discontinuation.
Methods
Positron emission tomography (PET) was used to examine regional bone metabolism in 20 postmenopausal women treated with ALN (n = 11) or RIS (n = 9) for a minimum of 3 years at screening (range 3–9 years, mean 5 years for both groups). Subjects underwent a dynamic scan of the lumbar spine and a static scan of both hips at baseline and 6 and 12 months following treatment discontinuation. 18 F-fluoride plasma clearance (Ki) at the spine was calculated using a three-compartment model. Standardised uptake values (SUV) were calculated for the spine, total hip, femoral neck and femoral shaft. Measurements of BMD and biochemical markers of bone turnover were also performed.
Results
With the exception of a significant decrease in spine BMD in the ALN group, BMD remained stable. Bone turnover markers increased significantly from baseline by 12 months for both study groups. Measurements of Ki and SUV at the spine and femoral neck did not change significantly in either group. SUV at the femoral shaft and total hip increased significantly but in the ALN group only, increasing by 33.8% (p = 0.028) and 24.0% (p = 0.013), respectively.
Conclusions
Bone metabolism at the spine remained suppressed following treatment discontinuation. A significant increase in SUV at the femoral shaft and total hip after 12 months was observed but for the ALN group only. This study was small, and further clinical studies are required to fully evaluate the persistence of BP treatment.
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Acknowledgements
We would like to thank the staff at the King’s College London PET Imaging Centre at St Thomas’ Hospital for their excellent technical support. This work was supported by an unrestricted grant from Warner Chilcott.
Conflicts of interest
Drs. Frost, Blake and Fogelman received research funding from Warner Chilcott to complete this study. Dr. Frost has received research funding from Eli Lilly, Warner Chilcott and Novartis. Dr. Fogelman has received research funding from Eli Lilly, Novartis, NPS, Procter & Gamble and Warner Chilcott. Dr. Eastell received consulting fees from Amgen, Novartis, Pfizer, Procter & Gamble, Servier, Ono and GSK; lecture fees from Eli Lilly and grant support from AstraZeneca, Procter & Gamble, Warner Chilcott, Amgen and Novartis. All other authors have no conflicts of interest.
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Frost, M.L., Siddique, M., Blake, G.M. et al. Regional bone metabolism at the lumbar spine and hip following discontinuation of alendronate and risedronate treatment in postmenopausal women. Osteoporos Int 23, 2107–2116 (2012). https://doi.org/10.1007/s00198-011-1805-9
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DOI: https://doi.org/10.1007/s00198-011-1805-9