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CLINICAL SCIENCE: Human Mineral Metabolism and Bone Disease |
1
*Ochsner Clinic Foundation and New Orleans Nephrology Associates New Orleans, Louisiana ||Our Lady of Lourdes RMC, Lafayette, Louisiana ¶Brookdale Plaza Nephrology Associates, Brooklyn, New York **Gosford Hospital, Gosford, New South Wales, Australia
2
Foothills Hospital, Calgary, Alberta, Canada
3
Credit Valley Hospital, Mississauga, Ontario, Canada
4
California Pacific Medical Center, San Francisco, California
5
6
7
8

Amgen Inc., Thousand Oaks, California
9

VA Greater Los Angeles Healthcare System and David Geffen School of Medicine at UCLA, Los Angeles, California
* To whom correspondence should be addressed. E-mail: jlindberg{at}bellsouth.net.
| Abstract |
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Management of secondary hyperparathyroidism is challenging with traditional therapy. The calcimimetic cinacalcet HCl acts on the calcium-sensing receptor to increase its sensitivity to calcium, thereby reducing parathyroid hormone (PTH) secretion. This phase 3, multicenter, randomized, placebo-controlled, double-blind study evaluated the efficacy and safety of cinacalcet in hemodialysis (HD) and peritoneal dialysis (PD) patients with PTH
300 pg/ml despite traditional therapy. A total of 395 patients received once-daily oral cinacalcet (260 HD, 34 PD) or placebo (89 HD, 12 PD) titrated from 30 to 180 mg to achieve a target intact PTH (iPTH) level of
250 pg/ml. During a 10-wk efficacy assessment phase, cinacalcet was more effective than control for PTH reduction outcomes, including proportion of patients with mean iPTH levels
300 pg/ml (46 versus 9%), proportion of patients with
30% reduction in iPTH from baseline (65 versus 13%), and proportion of patients with
20,
40, or
50% reduction from baseline. Cinacalcet had comparable efficacy in HD and PD patients; 50% of PD patients achieved a mean iPTH
300 pg/ml. Cinacalcet also significantly reduced serum calcium, phosphorus, and Ca x P levels compared with control treatment. The most common side effects, nausea and vomiting, were usually mild to moderate in severity and transient. Once-daily oral cinacalcet was effective in rapidly and safely reducing PTH, Ca x P, calcium, and phosphorus levels in patients who received HD or PD. Cinacalcet offers a new therapeutic option for controlling secondary hyperparathyroidism in patients with chronic kidney disease on dialysis.
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