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  • Title: The Efficacy of Parathyroid Hormone Analogues in Combination With Bisphosphonates for the Treatment of Osteoporosis: A Meta-Analysis of Randomized Controlled Trials.
    Author: Li W, Chen W, Lin Y.
    Journal: Medicine (Baltimore); 2015 Sep; 94(38):e1156. PubMed ID: 26402797.
    Abstract:
    Parathyroid hormone (PTH) analogues increase bone strength primarily by stimulating bone formation, whereas antiresorptive drugs (bisphosphonates) reduce bone resorption. Therefore, some studies have been designed to test the hypothesis that the concurrent administration of the 2 agents would increase bone density more than the use of either one alone. This meta-analysis aimed to determine whether combining PTH analogues with bisphosphonates would be superior to PTH alone. Electronic databases were searched to identify relevant publications up to March, 2014. Randomized controlled trials (RCTs) comparing PTH analogues combined bisphosphonates with PTH for osteoporosis were analyzed. According to the Cochrane Handbook for systematic Reviews of Interventions 5.2, we identified eligible studies, evaluated the methodological quality, and abstracted relevant data. Totally 7 studies involving 641 patients were included for meta-analysis. The pooled data showed that there were no significant differences in the percent change of spine BMD (MD1-year = -0.97, 95% CI -2.81 to 0.86, P = 0.30; MD2-year =  - 0.57, 95% CI -5.01 to 6.14, P = 0.84), femoral neck BMD (MD1-year = 0.60, 95% CI -0.91 to 2.10, P = 0.44; MD2-year = -0.73, 95% CI -4.97 to 3.51, P = 0.74), the risk of vertebral fracture (risk ratio [RR] = 1.27; 95% CI 0.29-5.57; P = 0.75), and the risk of nonvertebral fracture (RR = 0.97; 95% CI 0.40-2.35; P = 0.95) between the 2 groups, whereas combination group improves the percent change of hip BMD at 1 year (MD = 1.16, 95% CI 0.56-1.76; P < 0.01) than PTH analogues group. Our results showed that there was no evidence for the superiority of combination therapy, although significant change was found for hip BMD at 1 year in combination group. Further large multicenter randomized controlled trials are still needed to investigate the efficacy of combination therapy.
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