Abstract
Background
Bone mineral density (BMD) has been reported to increase without specific treatment in long-term renal transplant recipients. The aim of this study was to evaluate the effect of ibandronate on BMD and kidney function in long-term renal transplant recipients as compared to a control group. Furthermore, we searched for a gender-specific treatment effect of ibandronate on BMD.
Methods
In a retrospective, matched case-control study 60 stable renal transplant recipients were included on long-term follow-up. The patient cohort was divided into two groups. The control group (n = 30) comprised patients with close-to-normal bone mineral density who did not receive ibandronate treatment and the treatment group (n = 30) comprised patients with reduced bone mineral density who received ibandronate treatment. The groups were matched for sex, age at the time of renal transplantation, use of steroids, renal transplant function and time lag between the dual-energy X-ray absorptiometry (DEXA) measurements and renal transplantation. Patients of the treatment group were treated with 12.0 ± 6.7 g ibandronate. Treatment cycles lasted 19.3 ± 11.0 months. The first bone mineral density testing was performed 55.3 ± 60.2 months after renal transplantation followed by a second measurement 26.8 ± 12.1 months later.
Results
Both groups did not differ in absolute (g/cm2) or relative (%) changes in BMD at the lumbar spine (0.033 ± 0.079 vs. 0.055 ± 0.066 g/cm2, p = 0.217 and 3.6 ± 7.8 vs. 6.4 ± 8.1 %, p = 0.124) or femoral neck (0.013 ± 0.106 vs. 0.025 ± 0.077 g/cm2, p = 0.647 and 3.2 ± 13.6 vs. 5.0 ± 13.1 %, p = 0.544) over the study period. There was no correlation of ibandronate dosages with changes in BMD (LS: r = −0.089; p = 0.639 and FN: r =+0.288; p = 0.445). We could neither determine a negative effect of ibandronate on renal transplant function over the study period, estimated via the CKD-EPI formula (−2.9 ± 7.6 vs. −2.7 ± 10.6 mL/min/1.73 m2, p = 0.900) nor a gender-specific action of ibandronate on bone mass changes.
Conclusions
Ibandronate treatment was safe with respect to renal transplant function but did not result in a significant additive improvement in bone mineral density as compared to the untreated control group. A gender-specific action of ibandronate on BMD at the LS or FN could not be determined either.
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Author contribution
Frank-Peter Tillmann designed the study, performed the statistical analyses, and drafted the manuscript. Michael Schmitz helped to collect the data and drafted the manuscript. Marcus Jäger and Rüdiger Krauspe conceived the study and helped to draft the manuscript. Lars-Christian Rump conceived the study, participated in its design and coordination and helped to draft the manuscript.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Tillmann, F.P., Schmitz, M., Jäger, M. et al. Ibandronate in stable renal transplant recipients with low bone mineral density on long-term follow-up. Int Urol Nephrol 48, 279–286 (2016). https://doi.org/10.1007/s11255-015-1133-7
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DOI: https://doi.org/10.1007/s11255-015-1133-7