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Vertebral Fractures Following Discontinuation of Denosumab: a Post-hoc Analysis of the Randomized Placebo-controlled FREEDOM Trial and its Extension.

著者 Cummings SR , Ferrari S , Eastell R , Gilchrist N , Beck Jensen JE , McClung M , Roux C , Törring O , Valter I , Wang AT , Brown JP
J Bone Miner Res.2017 Nov 04 ; ():.
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Denosumab reduces bone resorption and vertebral and nonvertebral fracture risk. Denosumab discontinuation increases BTMs 3 months after a scheduled dose is omitted, reaching above-baseline levels by 6 months, and decreases BMD to baseline levels by 12 months. We analyzed the risk of new or worsening vertebral fractures, especially multiple vertebral fractures, in participants who discontinued denosumab during the FREEDOM study or its Extension. Participants received ≥2 doses of denosumab or placebo Q6M, discontinued treatment, and stayed in the study ≥7 months after the last dose. Of 1001 participants who discontinued denosumab during FREEDOM or Extension, the vertebral fracture rate increased from 1.2 per 100 participant-years during the on-treatment period to 7.1, similar to participants who received and then discontinued placebo (N=470; 8.5 per 100 participant-years). Among participants with ≥1 off-treatment vertebral fracture, the proportion with multiple (>1) was larger among those who discontinued denosumab (60.7%) than placebo (38.7%; p=0.049), corresponding to a 3.4% and 2.2% risk of multiple vertebral fractures, respectively. The odds (95% CI) of developing multiple vertebral fractures after stopping denosumab were 3.9 (2.1-7. 2) times higher in those with prior vertebral fractures, sustained before or during treatment, than those without, and 1.6 (1.3-1.9) times higher with each additional year of off-treatment follow-up; among participants with available off-treatment total hip (TH) BMD measurements, the odds were 1.2 (1.1-1.3) times higher per 1% annualized TH BMD loss. The rates (per 100 participant-years) of nonvertebral fractures during the off-treatment period were similar (2.8, denosumab; 3.8, placebo). The vertebral fracture rate increased upon denosumab discontinuation to the level observed in untreated participants. A majority of participants who sustained a vertebral fracture after discontinuing denosumab had multiple vertebral fractures, with greatest risk in participants with a prior vertebral fracture. Therefore, patients who discontinue denosumab should rapidly transition to an alternative antiresorptive treatment. This article is protected by copyright. All rights reserved.
PMID: 29105841 [PubMed - as supplied by publisher]
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