Abstract
In this post hoc analysis of the Denosumab Fracture Intervention Randomized Placebo-Controlled Trial (DIRECT) in Japanese postmenopausal women and men with osteoporosis, we evaluated the relationship between vertebral fracture risk and both bone mineral density (BMD) T-score and percent change after 24 months of denosumab treatment at total hip, femoral neck, and lumbar spine. Logistic regression analysis was performed and the proportion of treatment effect explained by BMD in vertebral fracture risk was estimated. The results demonstrate that both total hip BMD T-score and change can be strong predictors of subsequent fracture risk, and that total hip BMD change explained 73%, while T-score explained 23%, of the treatment effect. In contrast, neither femoral neck BMD change nor T-score can predict the effect of denosumab on vertebral fracture risk. Furthermore, although lumbar spine BMD T-score was associated with vertebral fracture incidence, lumbar spine BMD change was inversely related to vertebral fracture risk. Because there was no relationship between lumbar spine BMD change and T-score at 24 months of denosumab treatment, and because there can be small undetectable vertebral deformities that may increase BMD values, these results suggest that lumbar spine BMD change is not a good surrogate for vertebral fracture risk assessment. It is suggested that both total hip BMD change and T-score can be good surrogates for predicting vertebral fracture risk in Japanese patients with osteoporosis under denosumab treatment.
ClinicalTrials.gov identifier: NCT00680953.
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Acknowledgements
The study was sponsored by Daiichi Sankyo Co., Ltd., Tokyo, Japan.
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The study was funded by Daiichi Sankyo Co., Ltd., Tokyo, Japan.
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TM, TS, TH, MS, and TN provided substantial contributions to the study conception and design. TO, KW, and HT were involved in the design and conduct of the study and in collecting data. NO and SM were responsible for statistical analysis of the data. All authors revised the paper critically for intellectual content and approved the final version. All authors agree to be accountable for the work and to ensure that any questions relating to the accuracy and integrity of the paper are investigated and properly resolved.
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Naoki Okubo, Taisuke Osakabe, Ko Watanabe, and Hideo Takami are Daiichi Sankyo employees. Shigeyuki Matsui has received consulting fees from Daiichi Sankyo. Toshio Matsumoto has received consulting fees from Daiichi Sankyo, Chugai, Amgen, and Teijin. Toshitsugu Sugimoto has received consulting fees from Asahi-Kasei and Daiichi Sankyo. He has also received research grants from Eli Lilly Japan, Eisai, Chugai, Daiichi Sankyo, and Astellas. Takayuki Hosoi has received consulting fees from Daiichi Sankyo. Masataka Shiraki has received consulting fees from Daiichi Sankyo, Chugai, Teijin, Asahi-Kasei, and MSD. Toshitaka Nakamura has received consulting fees from Teijin, Daiichi Sankyo, Chugai, Asahi-Kasei, and Amgen.
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223_2020_750_MOESM1_ESM.tif
Supplemental Fig. 1 Relationship between incidence of new or worsening vertebral fracture over 2 years and T-score at baseline in (a) total hip BMD, (b) femoral neck BMD, and (C) lumbar spine BMD. The predicted curves with 95% confidence intervals are presented for each treatment group. Data represent the 5th to 95th percentiles in total hip BMD for each treatment group. The solid lines represent the denosumab group and the dashed lines represent the placebo group. (TIF 1262 kb)
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Okubo, N., Matsui, S., Matsumoto, T. et al. Relationship Between Bone Mineral Density and Risk of Vertebral Fractures with Denosumab Treatment in Japanese Postmenopausal Women and Men with Osteoporosis. Calcif Tissue Int 107, 559–566 (2020). https://doi.org/10.1007/s00223-020-00750-y
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DOI: https://doi.org/10.1007/s00223-020-00750-y