Teriparatide Plus Zoledronic Acid for Osteogenesis Imperfecta: A Randomized Clinical Trial.
Teriparatide plus zoledronic acid did not significantly reduce fracture risk in adults with osteogenesis imperfecta compared to standard care, despite increasing bone mineral density.
Where it sits
this study against the rest of the teriparatide (pth 1-34) corpusSummary and findings
This study assessed the effect of teriparatide plus zoledronic acid on fracture risk in adults with osteogenesis imperfecta. A total of 350 participants were randomized, receiving either the treatment or standard care. The results indicated no significant difference in fracture incidence between the two groups.
Abstract
<h4>Importance</h4>Osteogenesis imperfecta causes multiple fractures throughout life, causing substantial morbidity.<h4>Objective</h4>To determine whether the parathyroid hormone analogue teriparatide followed by zoledronic acid reduces the risk of fractures in adults with osteogenesis imperfecta.<h4>Design, setting, and participants</h4>Multicenter open-label, parallel-group, randomized clinical trial, conducted between May 17, 2017, and March 21, 2025, in adults attending one of 27 referral centers with a clinical diagnosis of osteogenesis imperfecta. Bone mineral density (BMD) was measured by dual x-ray absorptiometry and bone turnover by serum procollagen type 1 N-terminal propeptide and C-terminal telopeptide of type 1 collagen. Fractures were confirmed by skeletal imaging. Several measures of health-related quality of life were assessed.<h4>Interventions</h4>Those in the active group received 20 μg of teriparatide daily by subcutaneous injection for 2 years followed by an infusion of 5 mg of zoledronic acid. In the standard care group, bisphosphonates and other bone-targeted medicines could be used but teriparatide and other bone anabolic drugs were prohibited.<h4>Main outcomes and measures</h4>The primary end point was the number of participants with imaging-proven incident fractures adjudicated by reviewers blinded to treatment allocation. Secondary end points included the total number of fractures, changes in BMD, biochemical markers of bone turnover, and health-related quality of life.<h4>Results</h4>Of the 350 individuals randomized, 176 were allocated to receive teriparatide plus zoledronic acid, 174 to standard care, and 1 withdrew, leaving 349 evaluable participants. The mean age was 43.7 years (188 females [53.9%]). Most had type I osteogenesis imperfecta caused by pathogenic variants in the type 1 collagen genes. In the teriparatide plus zoledronic acid group 65 of 176 (36.9%) had incident fractures compared with 63 of 173 (36.4%) in the standard care group (absolute risk reduction, -1.57%; 95% CI, -9.90% to 5.89%; hazard ratio, 0.97; 95% CI, 0.68 to 1.38). Lumbar spine and total hip BMD increased significantly more with teriparatide plus zoledronic acid than standard care. Several quality-of-life measures favored teriparatide plus zoledronic acid. Adverse events were similar in both groups.<h4>Conclusions and relevance</h4>This randomized clinical trial among adults with osteogenesis imperfecta found that teriparatide plus zoledronic acid did not reduce fracture risk compared with standard care despite significantly increasing BMD, suggesting the importance of reduced bone quality rather than low bone density in the pathogenesis of fracture.<h4>Trial registration</h4>isrctn.org Identifier: ISRCTN15313991.
Background
The study addresses the treatment of Osteogenesis Imperfecta, a genetic disorder characterized by fragile bones. Previous research has indicated that Teriparatide, a parathyroid hormone analog, may enhance bone density, while Zoledronic Acid is known for its anti-resorptive properties. This study aims to explore the combined effects of these treatments, which could provide insights into more effective management strategies for this condition.
Methods
The study utilized a randomized clinical trial design, but specific details regarding the population, sample size, dosage, duration, and outcome measures were not reported in the abstract. The primary and secondary endpoints were not specified, limiting the understanding of the study's scope.
Results
Not reported in abstract.
Interpretation
Without specific results, it is challenging to compare this study's findings to existing literature. The lack of reported effect sizes or significance limits the ability to assess clinical relevance. Potential confounds include the absence of detailed methodology and outcomes, which are essential for evaluating the implications for clinical practice.
Key findings
- Not reported in abstract.
Limitations
- Not reported in abstract.