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Ten years of very infrequent zoledronate therapy in older women: an open-label extension of a randomized trial.

J Clin Endocrinol Metab. 2020 Feb 04;: Authors: Grey A, Horne A, Gamble G, Mihov B, Reid IR, Bolland M

CONTEXT: Intravenous zoledronate prevents bone loss and reduces fracture risk in older adults but the optimal dosing strategy required to achieve each outcome is not known. OBJECTIVE: To assess the effect of very infrequent zoledronate therapy on bone mineral density (BMD) and markers of bone turnover. DESIGN AND PARTICIPANTS: An average of 5.5 years after randomization to either a single dose of 5mg zoledronate or placebo, 33 of the original cohort of 50 older women with osteopenia entered a 5-year open-label extension study. SETTING: Academic research center. INTERVENTION: A 5mg dose of intravenous zoledronate was administered to all participants. MAIN OUTCOME MEASURES: BMD and bone turnover were measured annually, generating data over almost 11 years in women who received 5mg zoledronate at 0 and 5.5 years (ZZ, n=16), or placebo at baseline and 5mg zoledronate at 5.5 years (PZ, n=17). RESULTS: After redosing, BMD in ZZ remained stable, while BMD in PZ increased. At 11 years, changes from baseline BMD in ZZ and PZ were 3.8% (95% CI 1.1,6.5) and 2.9% (0.3,5.5) at the lumbar spine (P=0.61), 0.9% (-1.7,3.5) and -2.8% (-5.3,-0.3) at the total hip (P=0.006), and 0.4% (-0.8,1.6 ) and -0.4% (-1.3,0.5) at the total body (P=0.14). Bone turnover markers were similar in the PZ and ZZ groups throughout the 5 years after redosing. CONCLUSIONS: These results suggest that zoledronate 5mg administered at a 5.5-year interval prevents bone loss over almost 11 years. Clinical trials to investigate whether very infrequent treatment with zoledronate reduces fracture risk are justified. PMID: 32016386 [PubMed - as supplied by publisher]

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