Intravenous Zoledronic Acid 5 mg on Bone Turnover Markers and Bone Mineral Density in East China Subjects with Newly Diagnosed Osteoporosis: A 24-month Clinical Study.

Objective This randomized, double-blind, placebo-controlled study assessed the necessity of early intervention, safety and efficacy of intravenous zoledronic acid 5 mg/year in East China women with newly diagnosed osteoporosis at high risk of fracture during a 24-month treatment period. Methods Subjects (57 [52-62] years old) were randomized 3:2 to zoledronic acid versus placebo (randomized at baseline, zoledronic acid [175 cases], placebo-zoledronic acid [110 cases]). The bone mineral density of the lumbar spine and total hip was measured every 6 months with the use of dual-energy X-ray absorptiometry. Serum procollagen I N-terminal pro-peptide ( PINP) and serum C-telopeptide of type I collagen ( CTX) levels were measured every 6 months. The primary end point was the rate of change in the bone mineral density at the posteroanterior spine. Results For subjects with measurements at 24 months, zoledronic acid significantly increased bone mineral density ( BMD) at the lumbar spine (mean percent change ± SD, zoledronic acid 5.390% ± 0.854% versus placebo-zoledronic acid −1.038% ± 0.599%), the total hip (zoledronic acid 1.900% ± 0.262% versus placebo-zoledronic acid −1.631% ± 0.649%). Serum procollagen I N-terminal pro-peptide ( PINP) and CTX decreased rapidly with zoledronic acid 5 mg treatment ( P < 0.001 versus placebo at 6 month and 24 months) and changed from baseline in the zoledronic acid 5 mg and placebo-zoledronic acid 5 mg at 6 months by a mean of −66.348% and −75.375%, respectively ( P < 0.001), and at 24 months by −49.950% and −52.325%, respectively ( P < 0.001). No cases of serious adverse events were observed in two groups. Headache, pyrexia and myalgia occurred more commonly within the first 3 days after infusion with zoledronic acid 5 mg than with placebo (13.7% versus 2.1%, P = 0.0018; 28.0% versus 3.2%, P < 0.001; 21.7% versus 4.2%, P < 0.001, respectively). Conclusions These data show that early application of zoledronic acid 5 mg/year was well stimulated and tolerated for bone mass in newly diagnosed east china subjects with osteoporosis in a 24-month treatment. [ABSTRACT FROM AUTHOR]