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An assessment of cinacalcet HCl effects on bone histology in dialysis patients with secondary hyperparathyroidism.

Author(s): Malluche HH, Monier-Faugere MC, Wang G, Fraza O JM, Charytan C, Coburn JW, Coyne DW, Kaplan MR, Baker N, McCary LC, Turner SA, Goodman WG

Affiliation(s): University of Kentucky, Division of Nephrology, Bone and Mineral Metabolism, Lexington, KY 40536-0084, USA. hhmall@uky.edu

Publication date & source: 2008-04, Clin Nephrol., 69(4):269-78.

Publication type: Randomized Controlled Trial; Research Support, Non-U.S. Gov't

AIMS: Cinacalcet lowers plasma parathyroid hormone (PTH) levels in patients with secondary hyperparathyroidism (sHPT), but the bone histologic response has not been described. This prospective, double-blind, placebo-controlled trial assessed the effects of cinacalcet on bone histology and serum markers of bone metabolism in dialysis patients with sHPT. METHODS: Patients with intact PTH (iPTH) > or = 300 pg/ml were randomly assigned 2:1 to receive cinacalcet or placebo with concurrent vitamin D and/or phosphate binder therapy. Cinacalcet (30 - 180 mg/day) was used to achieve iPTH levels < or = 200 pg/ml. Bone biopsies were performed before and after one year of treatment. RESULTS: Baseline and end-of-study data were available from 32 patients (19 cinacalcet, 13 placebo). Baseline bone turnover was elevated in 27, reduced in 3 and normal in 2 patients. Serum bone-specific alkaline phosphatase (BSAP) and N-telopeptide (NTx) were elevated. Cinacalcet treatment decreased PTH and diminished activation frequency, bone formation rate/bone surface, and fibrosis surface/bone surface. Adynamic bone was observed in three patients receiving cinacalcet; in two of these, PTH levels were persistently low (< 100 pg/ml). The histomorphometric parameter changes in bone corresponded to PTH, BSAP and NTx reductions. Bone mineralization parameters remained normal. CONCLUSIONS: Treatment with cinacalcet lowered PTH and reduced bone turnover and tissue fibrosis among most dialysis patients with biochemical evidence of sHPT.

Page last updated: 2008-06-22

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