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Objective We performed a prospective study to determine the efficacy and safety of denosumab on bone metabolic indices and bone mineral density (BMD) in 29 patients receiving long-term glucocorticoids (GCs) who had clinical risk factors for fracture. Methods Among these patients, 16 had systemic lupus erythematosus (SLE), 6 RA, 4 other autoimmune diseases, and 3 renal diseases. All patients received donosumab 60 mg at baseline and 6 months. Serum N-terminal cross-linked telopeptide of type I collagen (NTX) and bone-specific alkaline phosphatase (BAP) levels were measured as bone metabolic indices. BMD at the lumbar spine (LSBMD) and femoral neck (FNBMD) were measured using dual energy X-ray absorptiometry and expressed as a percentage of the young adult mean (%YAM). Results Denosumab therapy significantly reduced serum NTX and BAP levels from baseline after 12 months (from 19.2 to 13.9 nmol BCE/L; from 11.9 to 9.2 U/L, respectively). In 18 patients treated with bisphosphonates before the start of denosumab therapy, the improvements in the LSBMD and FNBMD values were 1.5%YAM/year and 1.1%YAM/year, respectively. The LSBMD and FNBMD values were both significantly higher 12 months after denosumab therapy (3.5%YAM/year and 3.0%YAM/year, respectively). The LSBMD gain was significantly higher after denosumab therapy than during bisphosphonate therapy. No fractures were observed in any patients during denosumab therapy. Conlusion Denosumab is effective and safe in preventing bone resorption and BMD loss in patients treated with long-term GCs for inflammatory diseases. This is the first study showing a significant increase in not only LSBMD but also FNBMD in GC-induced osteoporosis after denosumab therapy.

Effects of Denosumab on Bone Metabolic Markers and Bone Mineral Density in Patients Treated with Glucocorticoids