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The comparison of alendronate and raloxifene after denosumab (CARD) study: A comparative efficacy trial

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A Correction to this article was published on 09 November 2023

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Abstract

Summary

Denosumab discontinuation results in accelerated bone remodeling, decreased bone mineral density (BMD), and an increased risk of multiple vertebral fractures. Bisphosphonates are at least partially effective at inhibiting these consequences but there have been no randomized clinical trials assessing the efficacy of alternative antiresorptives.

Purpose

The aim of this study was to evaluate the comparative efficacy of alendronate and the SERM, raloxifene, in preventing the post-denosumab high-turnover bone loss.

Methods

We conducted an open-label randomized controlled trial in which 51 postmenopausal women at increased risk of fracture were randomized with equal probability to receive 12-months of denosumab 60-mg 6-monthly followed by 12-months of either alendronate 70-mg weekly or raloxifene 60-mg daily. Serum bone remodeling markers were measured at 0,6,12,15,18, and 24 and areal BMD of the distal radius, spine, and hip were measured at 0,12,18 and 24 months.

Results

After denosumab discontinuation, serum markers of bone remodeling remained suppressed when followed by alendronate, but gradually increased to baseline when followed by raloxifene. In the denosumab-to-alendronate group, denosumab-induced BMD gains were maintained at all sites whereas in the denosumab-to-raloxifene group, BMD decreased at the spine by 2.0% (95% CI -3.2 to -0.8, P = 0.003) and at the total hip by 1.2% (-2.1 to -0.4%, P = 0.008), but remained stable at the femoral neck and distal radius and above the original baseline at all sites. The decreases in spine and total hip BMD in the denosumab-to-raloxifene group (but not the femoral neck or distal radius) were significant when compared to the denosumab-to-alendronate group.

Conclusions

These results suggest that after one year of denosumab, one year of alendronate is better able to maintain the inhibition of bone remodeling and BMD gains than raloxifene.

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Correspondence to Sabashini K. Ramchand.

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JNT has a financial interest in Amgen. JNT’s interests were reviewed and are managed by MGH and Mass General Brigham in accordance with their conflict-of-interest policies. All other authors have no conflicts of interest to declare.

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Sabashini K. Ramchand and Joy N. Tsai are equal first authors.

The original online version of this article was revised: the ‘Co-first authorship’ note was missing, and should have read that Sabashini K. Ramchand and Joy N. Tsai are equal first authors.

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Ramchand, S.K., Tsai, J.N., Lee, H. et al. The comparison of alendronate and raloxifene after denosumab (CARD) study: A comparative efficacy trial. Osteoporos Int 35, 255–263 (2024). https://doi.org/10.1007/s00198-023-06932-2

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