Randomized controlled trial of zoledronic acid for treatment of osteoporosis in women
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1 Research Report Randomized controlled trial of zoledronic acid for treatment of osteoporosis in women Journal of International Medical Research 41(3) ! The Author(s) 2013 Reprints and permissions: sagepub.co.uk/journalspermissions.nav DOI: / imr.sagepub.com Hua Bai 1, *, Danqing Jing 1, *, Aitao Guo 2 and Shinan Yin 1 Abstract Objective: To assess the effect of zoledronic acid (ZOL) on bone mineral density (BMD) and fracture risk at the L1 L4 vertebrae, femoral neck, hip and trochanter in Chinese women with osteoporosis. Methods: A randomized controlled trial was conducted in female patients with osteoporosis, randomized to receive one 5-mg ZOL intravenous infusion per year or placebo equivalent. Facture risk and BMD were measured over a 2-year follow-up period. Results: A statistically significant reduction in the risk of fracture was observed at the trochanter in the ZOL group (n ¼ 242) compared with the placebo group (n ¼ 241); (odds ratio 0.54 [95% confidence interval 0.29, 0.98]): BMD was 0.24, 0.28, 0.31 and 0.22 greater at the L1 L4 vertebrae, total hip, femoral neck and trochanter, respectively, in the ZOL group. The incidence of adverse events was comparable between treatment groups. Conclusions: This study indicated that ZOL could increase BMD and reduce fracture risk in women with osteoporosis over a 2-year follow-up period, and was not associated with any serious drug-related adverse effects. Keywords Zoledronic acid, osteoporosis, fracture, bone mineral density, randomized controlled trial Date received: 3 January 2013; accepted: 18 January Department of Endocrinology, First Affiliated Hospital of The General Hospital of the People s Liberation Army (PLA), Beijing , China 2 Department of Pathology, The General Hospital of the PLA, Beijing , China *These authors contributed equally to this work. Corresponding author: Dr Shinan Yin, Department of Endocrinology, First Affiliated Hospital of the General Hospital of the PLA, Gong Ti Nan Road, Chaoyang District, Beijing , China. ysn667@163.com
2 698 Journal of International Medical Research 41(3) Introduction Osteoporosis is a skeletal disease characterized by compromised bone strength and increased risk of fracture. 1 In the USA, osteoporosis occurs in 55% of the population aged 50 years. 2 The incidence of osteoporosis is likely to rise as life expectancy increases. It is estimated, for example, that >25% of the population in Canada will be aged 65 years by According to the World Health Organization, it is estimated that there are 75 million people with osteoporosis in Europe, the USA and Asia, with 9 million new fractures reported every year, worldwide. 3,4 Osteoporosis-related fractures are usually associated with increased morbidity and mortality, and increased healthcare costs. 5 7 Several therapies (including teriparatide, calcitonin, alendronate and strontium ranelate) have been shown to be well tolerated and effective in the prevention of osteoporosis Clinical studies have indicated that nitrogen-containing bisphosphonates not only inhibit bone resorption but also preserve bone mass, thereby reducing the risk of osteoporotic fractures. 11 Most bisphosphonates are given orally but this results in low bioavailability and poor adherence, which consequently reduce the treatment benefit Alendronate and risedronate have been reported to reduce nonvertebral and hip fractures in women with osteoporosis Zoledronic acid (ZOL) is an aminobisphosphonate that has a prolonged dosing interval and a high affinity for mineralized bone. 19 Intravenous infusion of ZOL may rapidly localize to bone, where it reduces osteoclastic bone resorption through inhibition of farnesyl pyrophosphate synthase, which is a key enzyme in the mevalonate pathway. 19,20 The effectiveness and tolerability of intravenous ZOL in decreasing fracture risk and influencing bone mineral density (BMD) has not previously been explored in a mainland Chinese female population. As such, there is a clinical need for randomized controlled trials of ZOL in this population. The present study assessed the effect of ZOL on BMD and fracture risk at the L1 L4 vertebrae, femoral neck, hip and trochanter, in women with osteoporosis enrolled in a 2-year, randomized, placebo-controlled trial at a large teaching hospital in China. Patients and methods Study population Female patients with a primary diagnosis of osteoporosis were recruited from the Department of Endocrinology, First Affiliated Hospital of the General Hospital of the PLA, Beijing, China between May 2008 and November For inclusion in the study women had to be postmenopausal, have a BMD T-score 2.5 at the femoral neck but no evidence of vertebral fractures, or a BMD T-score 1.5 with radiological diagnosis of two or more vertebral fractures. Exclusion criteria were: (i) patients with secondary osteoporosis or other diseases known to affect bone metabolism; (ii) patients taking sodium fluoride, parathyroid hormone, anabolic steroids or growth hormone within 6 months of study entry, or systemic corticosteroids within 12 months of study entry; (iii) patients with malignant, hepatic and renal diseases; (iv) a serum calcium concentration of >11.0 mg/dl and untreated hypocalcaemia. The Ethics Committee of the First Affiliated Hospital of the General Hospital of the PLA reviewed and approved the study protocol. All patients enrolled in the study provided written informed consent. Study treatment Eligible patients were randomized at study entry to receive 5 mg ZOL (Yangtze River Pharmaceutical Group, Taizhou, Jiangsu Province, China) by intravenous infusion or placebo intravenous infusion (0.25 mg
3 Bai et al. 699 activated vitamin D3) at the start of the study and after 12 months. All patients also received a supplement of 600 mg elemental calcium and 400 IU vitamin D, orally, taken every day for the duration of the study. Study assessments Patients were followed up with telephone interviews and clinic visits at 6, 12, 18 and 24 months over the 2-year study period. Clinic visits consisted of an assessment of BMD, fracture incidence and adverse effects of treatment. Bone mineral densities of the lumbar vertebrae (L1 L4), total hip, femoral neck and trochanter were measured by dualenergy X-ray absorptiometry (Hologic Õ, Waltham, MA, USA) at each study visit. Vertebral fracture was defined as a reduction of 20% (minimum 4 mm) from baseline in the height of any vertebra, as measured by radiography. All fractures were confirmed by the Genant et al. 21 semiquantitative assessment method. Safety assessments included recording of all adverse events, physical examination, measurement of vital signs, haematological toxicity monitoring, blood biochemistry and urinalysis at each clinic visit during followup. Adverse events were recorded and classified according to the Medical Dictionary for Regulatory Activities. 22 Statistical analyses Statistical analyses were carried out using SPSS Õ statistical software, version 16.0 (SPSS, Inc. Chicago, IL, USA) for Windows Õ. Efficacy and safety parameters were compared between ZOL and placebo groups by Student s t-test for continuous variables or 2 -test for categorical variables. BMD was expressed as mean SD; change in BMD was calculated as the mean percentage change from baseline. Fracture rate was evaluated as a percentage. Statistical significance was set at P < 0.05 and all tests were two-sided. Results A total of 694 patients with osteoporosis were screened for inclusion in the study; 211 of these patients were ineligible for study participation according to the prespecified inclusion and exclusion criteria, therefore 483 were randomized to treatment. Of the randomized patients, 242 received ZOL and 241 received placebo. The mean body mass index (BMI), previous osteoporosis drug use, T-score at the femoral neck and baseline BMD in the L1 L4 lumbar vertebrae, femoral neck, hip and trochanter were similar in the ZOL and placebo groups. Demographic characteristics and T-scores at the femoral neck for the patient population are summarized in Table 1; baseline BMD is presented in Table 2. Fracture incidence at the L1 L4 Table 1. Demographic and baseline characteristics of 483 Chinese women with osteoporosis, randomized to receive 5 mg zoledronic acid (ZOL), administered once every 12 months, or placebo equivalent. Characteristic ZOL n ¼ 242 Placebo n ¼ 241 Age, years Body mass index, kg/m 2 Previous vertebral fracture a 149 (61.57) 144 (59.75) T-score at femoral neck (43.39) 109 (45.23) 2.5 to (54.13) 126 (52.28) (2.48) 6 (2.49) Data presented as mean SD or n (%) of patients. a Vertebral fracture was defined as a reduction of 20% (minimum 4 mm) from baseline in the height of any vertebra as measured by radiography. No statistically significant between-group differences were observed (P 0.05; Student s t-test for continuous variables or 2 -test for categorical variables).
4 700 Journal of International Medical Research 41(3) vertebrae, femoral neck, hip and trochanter was lower in patients receiving ZOL compared with patients receiving placebo (Figure 1); the only significant differences between treatment groups were at the trochanter (P < 0.05) and in the overall fracture risk (46% difference, odds ratio 0.54 [95% confidence interval [CI] 0.29, 0.98]). Compared with the placebo group, BMD was significantly higher in the ZOL group at all regions, as assessed at the 24-month follow-up (P < 0.05; Table 2, Figure 2A D). No statistically significant differences were observed between the two treatment groups with respect to serious adverse events or deaths: eight (3.3%) patients in the ZOL Table 2. Bone mineral density at the L1 L4 vertebrae, femoral neck, total hip and trochanter in 483 Chinese women with osteoporosis, randomized to receive 5 mg zoledronic acid (ZOL), administered once every 12 months, or placebo equivalent. ZOL n ¼ 242 Placebo n ¼ 241 Statistical significance a Region Baseline 24 months Baseline 24 months Baseline 24 months L1 L4 vertebrae NS P < 0.05 Femoral neck NS P < 0.05 Total hip NS P < 0.05 Trochanter NS P < 0.05 Data presented as mean SD. a Bone mineral density was compared between treatment groups by Student s t-test. NS, not statistically significant (P 0.05). Figure 1. Mean incidence of fractures during a 24-month follow-up period in Chinese women with osteoporosis, treated with 5 mg zoledronic acid (n ¼ 242) administered once every 12 months, or placebo equivalent (n ¼ 241). *P < 0.05 (Student s t-test)
5 Bai et al. 701 Figure 2. Change in bone mineral density (BMD) at (A) L1 L4 vertebrae, (B) total hip, (C) femoral neck and (D) trochanter, in Chinese women with osteoporosis treated with 5 mg zoledronic acid (n ¼ 242) administered once every 12 months, or placebo equivalent (n ¼ 241). *P < 0.05 (Student s t-test)
6 702 Journal of International Medical Research 41(3) group and nine (3.7%) patients in the placebo group experienced serious adverse events or died during the study. Serious cardiac symptoms were reported in six (2.5%) patients in the ZOL group and eight (3.3%) patients in the placebo group. There were no significant differences in the incidences of the most common adverse events, which were first-dose acute-phase reactions: headache, chills, pyrexia, myalgia, arthralgia and influenza-like symptoms were reported in 67 (27.7%) patients receiving ZOL and 61 (25.3%) patients receiving placebo. There were no significant differences in the incidences of the more serious events of atrial fibrillation, cardiac arrhythmia and renal dysfunction. Discussion In the present randomized controlled clinical trial, treatment of Chinese women with osteoporosis with an annual injection of 5 mg ZOL significantly increased BMD in the L1 L4 vertebrae, total hip, femoral neck and trochanter, and lowered the incidence of fractures, compared with the rates observed in the placebo group. The differences in BMD between the two groups remained significant during 24 months follow-up. Findings from the present study are consistent with those of previous trials Findings of a study in Taiwan indicated that, compared with placebo, ZOL was associated with an increase in BMD of 4.9%, 4.3% and 7.0% in the total hip, femoral neck and trochanter, respectively, in Chinese women with osteoporosis. 24 Similarly, it has been reported that an annual single 15-min infusion of 5 mg ZOL significantly improved BMD over a 3-year period and was not associated with serious adverse events, compared with placebo. 23 Published data on the effects of ZOL in osteoporosis are, however, inconsistent. Another large sample study with 7765 postmenopausal osteoporosis-affected women indicated that 5 mg ZOL had no significant influence on BMD in the femoral neck compared with placebo. 26 Such discrepancies in clinical outcome may be due to differing case backgrounds, sample size or other factors. The role of ZOL in women with osteoporosis, therefore, needs to be validated in larger sample-size studies (including women of different ethnicities or including more ethnically diverse groups). In the present study, the overall fracture risk over 24 months in osteoporosis-affected women treated with ZOL was lower compared with placebo, which confirms the findings of previous studies It has been reported that ZOL treatment significantly lowered the incidence of clinical vertebral and nonvertebral fractures compared with placebo (hazard ratio [95% CI] of ZOL for fracture during the 3-year follow-up period 0.34 [0.21, 0.55]). 25 In their study, Hwang et al. 24 demonstrated that ZOLtreated patients had a significantly reduced risk of morphometric vertebral fracture and clinical vertebral fracture. Taken together, these data suggest that ZOL treatment plays an important role in preventing fractures among women with osteoporosis. The most common adverse events associated with ZOL treatment in the present study were first-dose acute-phase reactions such as pyrexia, myalgia, arthralgia, headache, chills and influenza-like symptoms. Similar symptoms have also been reported elswhere. 23,27 30 The incidence of serious adverse events in the present study was, however, markedly lower than that determined in some investigations 24,30 and this may be due to discrepancies in the average BMI between the populations studied. In conclusion, results of the present randomized, placebo-controlled clinical trial indicate that a single yearly dose of 5 mg ZOL can increase BMD and decrease the risk of fracture among female patients with osteoporosis over a 24-month period. Furthermore, ZOL was not associated with
7 Bai et al. 703 any serious drug-related adverse effects. The present findings suggest that ZOL could be used as an effective treatment for women with osteoporosis. Declaration of conflicting interest The authors declare that there are no conflicts of interest. Funding This research received no specific grant from any funding agency in the public, commercial, or notfor-profit sectors. Acknowledgements The authors would like to thank the First Affiliated Hospital of the General Hospital of the People s Liberation Army for its help and all the patients who participated in this study. References 1. National Institutes of Health Consensus Development Panel on Osteoporosis Prevention, Diagnosis, and Therapy. Osteoporosis prevention, diagnosis, and therapy. JAMA 2001; 285: National Osteoporosis Foundation. Clinician s guide to prevention and treatment of osteoporosis. Washington DC: USA, International Osteoporosis Foundation. Facts and statistics about osteoporosis and its impact, docs/facts-and-statistics.html (2010, accessed 9 April 2013). 4. Burge R, Dawson-Hughes B, Solomon DH, et al. Incidence and economic burden of osteoporosis-related fractures in the United States, J Bone Miner Res 2007; 22: International Osteoporosis Foundation. Quality of life: why prevent the first fracture? (2010, accessed 9 April 2013). 6. Nshimyumukiza L, Durand A, Gagnon M, et al. An economic evaluation: simulation of the cost-effectiveness and cost-utility of universal prevention strategies against osteoporosis-related fractures. J Bone Miner Res 2013; 28: Viswanathan HN, Curtis JR, Yu J, et al. Direct healthcare costs of osteoporosisrelated fractures in managed care patients receiving pharmacological osteoporosis therapy. Appl Health Econ Health Policy 2012; 10: Hwang JS, Tu ST, Yang TS, et al. Teriparatide vs. calcitonin in the treatment of Asian postmenopausal women with established osteoporosis. Osteoporos Int 2006; 17: Yen ML, Yen BL, Jang MH, et al. Effects of alendronate on osteopenic postmenopausal Chinese women. Bone 2000; 27: Hwang JS, Chen JF, Yang TS, et al. The effects of strontium ranelate in Asian women with postmenopausal osteoporosis. Calcif Tissue Int 2008; 83: Bianchi G and Sambrook P. Oral nitrogencontaining bisphosphonates: a systematic review of randomized clinical trials and vertebral fractures. Curr Med Res Opin 2008; 24: Cramer JA, Amonkar MM, Hebborn A, et al. Compliance and persistence with bisphosphonate dosing regimens among women with postmenopausal osteoporosis. Curr Med Res Opin 2005; 21: Penning-van Beest FJ, Erkens JA, Olson M, et al. Loss of treatment benefit due to low compliance with bisphosphonate therapy. Osteoporos Int 2008; 19: Lai PS, Chua SS, Chew YY, et al. Effects of pharmaceutical care on adherence and persistence to bisphosphonates in postmenopausal osteoporotic women. J Clin Pharm Ther 2011; 36: Sergi G, Pintore G, Falci C, et al. Preventive effect of risedronate on bone loss and frailty fractures in elderly women treated with anastrozole for early breast cancer. J Bone Miner Metab 2012; 30: Osaki M, Tatsuki K, Hashikawa T, et al. Beneficial effect of risedronate for preventing recurrent hip fracture in the elderly
8 704 Journal of International Medical Research 41(3) Japanese women. Osteoporos Int 2012; 23: Ferrari S, Nakamura T, Hagino H, et al. Longitudinal change in hip fracture incidence after starting risedronate or raloxifene: an observational study. J Bone Miner Metab 2011; 29: Altintas F, Ozkut AT, Beyzadeog lu T, et al. [The effect of risedronate treatment on bone turnover markers in patients with hip fracture]. Acta Orthop Traumatol Turc 2007; 41: Kavanagh KL, Guo K, Dunford JE, et al. The molecular mechanism of nitrogen-containing bisphosphonates as antiosteoporosis drugs. Proc Natl Acad Sci USA 2006; 103: Palacio EP, Mu ller SS, Sardenberg T, et al. Detecting early biomechanical effects of zoledronic Acid on femurs of osteoporotic female rats. J Osteoporos 2012; 2012: Genant HK, Wu CY, van Kuijk C, et al. Vertebral fracture assessment using a semiquantitative technique. J Bone Miner Res 1993; 8: MedDRA MSSO. Medical Dictionary for Regulatory Activities Maintenance and Support Services version Reston, VA: Northrop Grumman Corp, Black DM, Delmas PD, Eastell R, et al. Once-yearly zoledronic acid for treatment of postmenopausal osteoporosis. N Engl J Med 2007; 356: Hwang JS, Chin LS, Chen JF, et al. The effects of intravenous zoledronic acid in Chinese women with postmenopausal osteoporosis. J Bone Miner Metab 2011; 29: Boonen S, Black DM, Colo n-emeric CS, et al. Efficacy and safety of a once-yearly intravenous zoledronic acid 5 mg for fracture prevention in elderly postmenopausal women with osteoporosis aged 75 and older. J Am Geriatr Soc 2010; 58: Eastell R, Black DM, Boonen S, et al. Effect of once-yearly zoledronic acid five milligrams on fracture risk and change in femoral neck bone mineral density. J Clin Endocrinol Metab 2009; 94: Boonen S, Reginster JY, Kaufman JM, et al. Fracture risk and zoledronic acid therapy in men with osteoporosis. N Engl J Med 2012; 367: Gamsjaeger S, Hofstetter B, Zwettler E, et al. Effects of 3 years treatment with once-yearly zoledronic acid on the kinetics of bone matrix maturation in osteoporotic patients. Osteoporos Int 2013; 24: Silverman SL, Kriegman A, Goncalves J, et al. Effect of acetaminophen and fluvastatin on post-dose symptoms following infusion of zoledronic acid. Osteoporos Int 2011; 22: McClung M, Recker R, Miller P, et al. Intravenous zoledronic acid 5 mg in the treatment of postmenopausal women with low bone density previously treated with alendronate. Bone 2007; 41:
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