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  • Title: A single infusion of zoledronic acid produces sustained remissions in Paget disease: data to 6.5 years.
    Author: Reid IR, Lyles K, Su G, Brown JP, Walsh JP, del Pino-Montes J, Miller PD, Fraser WD, Cafoncelli S, Bucci-Rechtweg C, Hosking DJ.
    Journal: J Bone Miner Res; 2011 Sep; 26(9):2261-70. PubMed ID: 21638319.
    Abstract:
    Two trials have shown that a single 5-mg infusion of zoledronic acid achieves much higher response rates in Paget disease of bone than risedronate. The duration of this effect is unknown. We have conducted an open follow-up of responders from the two trials (152 originally treated with zoledronic acid, 115 with risedronate) out to 6.5 years without further intervention. Endpoints were times to relapse (ie, return of serum total alkaline phosphatase activity to within 20% of the pretreatment value) or loss of response (response = normalization of alkaline phosphatase or 75% or greater reduction in its excess). Bone turnover markers were lower in the zoledronic acid group throughout follow-up, with mean alkaline phosphatase (ALP) remaining within the reference range in these patients, whereas the mean in the risedronate group was above normal from 1 year. Relapse rates were substantially greater in the risedronate group (23 of 115, 20%) than in those treated with zoledronic acid (1 of 152, 0.7%, p < .001), and loss of response occurred in 19 (12.5%) zoledronic acid patients compared with 71 (62%) risedronate patients (p < .0001). Risk ratios for relapse and loss of response in zoledronic acid patients were 0.02 [95% confidence interval (CI) 0.00-0.18] and 0.12 (95% CI 0.07-0.19), respectively. Changes from baseline in quality of life, assessed using SF-36 scores, were more positive in the zoledronic acid group across the follow-up period (p = .01). Bone markers at 6 months were predictive of response duration. These data demonstrate an unprecedented duration of remission of Paget disease following treatment with zoledronic acid, accompanied by an improved quality of life.
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