Abstract
We investigated rates of insufficient and over-responsiveness to orally administered bisphosphonates in postmenopausal women, and tested the efficacy of intravenous ibandronate in patients with insufficient response to orally administered bisphosphonates. Postmenopausal women were treated with either alendronate (70 mg/week; n = 88) or risedronate (35 mg/week; n = 84) for 1 year, and their response to orally administered bisphosphonates was assessed using serum C-telopeptide (CTX) levels. Insufficient responders were changed to once-quarterly intravenous ibandronate 3 mg injection (n = 13) or maintained on orally administered bisphosphonates (n = 19), according to patients’ preference, for an additional 1 year. There was no significant difference in baseline characteristics between two orally administered bisphosphonate groups except the bone mineral density values at the lumbar spine. Insufficient rate was higher in the risedronate group (19.0 %) than in the alendronate group (8.0 %), using the premenopausal serum CTX median as a cut-off (P = 0.043). The over-response rate among the alendronate group (59.1 %) was significantly higher than that in the risedronate group (38.1 %), based on a serum CTX cut-off value of 0.100 ng/ml (P = 0.006). Intravenous ibandronate suppressed serum CTX levels to a significantly greater degree at 7 days after the second dosing (0.191 ± 0.110 ng/mL; P < 0.001) and 3 months after the fourth dosing (0.274 ± 0.159 ng/mL; P = 0.004) among insufficient responders, compared with post-oral/pre-intravenous levels (0.450 ± 0.134 ng/mL). Rates of insufficient and over-responsiveness to orally administered bisphosphonates were considerable, and a change to intravenous bisphosphonates may be considered in patients showing an insufficient response to orally administered bisphosphonates.
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Acknowledgments
This study was supported by a grant of the Korea Health Technology R&D Project, Ministry of Health & Welfare, Republic of Korea (Project No.: A110536).
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All authors have no conflicts of interest.
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S. J. Bae and B.-J. Kim contributed equally to this work.
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Bae, S.J., Kim, BJ., Lim, K.H. et al. Efficacy of intravenously administered ibandronate in postmenopausal Korean women with insufficient response to orally administered bisphosphonates. J Bone Miner Metab 30, 588–595 (2012). https://doi.org/10.1007/s00774-012-0361-5
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DOI: https://doi.org/10.1007/s00774-012-0361-5