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Delayed Denosumab Injections and Bone Mineral Density Response: An Electronic Health Record-based Study.

J Clin Endocrinol Metab. 2020 Jan 02;: Authors: Lyu H, Zhao SS, Yoshida K, Tedeschi SK, Xu C, Nigwekar SU, Leder BZ, Solomon DH

CONTEXT: Discontinuation of denosumab leads to a rapid reversal of its therapeutic effect. However, there are no data regarding how unintended delays or missed injections of denosumab impact bone mineral density (BMD) response. OBJECTIVE: We examined the association of delays in injections of denosumab with BMD change. DESIGN: We used electronic medical records from two academic hospitals from 2010 to 2017. PARTICIPANTS: Patients over 45 years of age and used at least two doses of 60mg denosumab. Denosumab adherence was evaluated by the medication coverage ratio (MCR). Good adherence corresponds to a dosing interval ≤7 months (defined by MCR ≥93%), moderate adherence corresponds to an interval of 7-10 months (MCR 75-93%), and poor adherence corresponds to an interval ≥10 months (MCR ≤74%). OUTCOME MEASURES: Annualized percent BMD change from baseline at the lumbar spine, total hip, and femoral neck. RESULTS: We identified 938 denosumab injections among 151 patients; the mean (SD) age was 69 (10) years, and 95% were female. Patients with good adherence had an annualized BMD increase of 3.9% at the lumbar spine, compared with patients with moderate (3.0%) or poor adherence (1.4%, p for trend 0.002). Patients with good adherence had an annualized BMD increase of 2.1% at the total hip, compared with patients with moderate (1.3%) or poor adherence (0.6%, p for trend 0.002). CONCLUSIONS: A longer interval between denosumab injections is associated with suboptimal BMD response at both spine and total hip. Strategies to improve the timely administration of denosumab in real-world settings are needed. PMID: 31894244 [PubMed - as supplied by publisher]

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