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  • Title: Effects of odanacatib on BMD and safety in the treatment of osteoporosis in postmenopausal women previously treated with alendronate: a randomized placebo-controlled trial.
    Author: Bonnick S, De Villiers T, Odio A, Palacios S, Chapurlat R, DaSilva C, Scott BB, Le Bailly De Tilleghem C, Leung AT, Gurner D.
    Journal: J Clin Endocrinol Metab; 2013 Dec; 98(12):4727-35. PubMed ID: 24064689.
    Abstract:
    CONTEXT: Odanacatib (ODN) is a selective cathepsin K inhibitor being developed to treat osteoporosis. OBJECTIVE: The effects of ODN were evaluated on bone mineral density (BMD), biochemical markers of bone turnover, and safety in patients previously treated with alendronate. DESIGN: This was a randomized, double-blind, placebo-controlled, 24-month study. SETTING: The study was conducted at private or institutional practices. PARTICIPANTS: Postmenopausal women (n = 243) ≥ 60 years of age with low BMD at the total hip, femoral neck, or trochanter (T-score ≤-2.5 but >-3.5 without prior fracture or ≤-1.5 but >-3.5 with prior fracture) on alendronate for ≥ 3 years. INTERVENTION: The intervention included ODN 50 mg or placebo weekly. MAIN OUTCOME MEASURES: The primary end point was percentage change from baseline of femoral neck BMD at month 24. BMD was assessed by dual-energy x-ray absorptiometry at baseline and 6, 12, and 24 months. Biochemical markers of bone turnover (serum C-telopeptides of type 1 collagen, urinary N-telopeptides of type 1 collagen, serum bone specific alkaline phosphatase, and serum N-terminal propeptide of type 1 collagen) were measured at baseline and 3, 6, 12, 18, and 24 months. RESULTS: In the ODN group, BMD changes from baseline at the femoral neck, trochanter, total hip, and lumbar spine at 24 months (1.7%, 1.8%, 0.8%, and 2.3%, respectively) were significantly different from the placebo group. ODN significantly decreased urinary N-telopeptides of type 1 collagen to creatinine ratio and significantly increased serum N-terminal propeptide of type 1 collagen compared with placebo. Serum C-telopeptides of type 1 collagen was unexpectedly increased with ODN treatment. The safety profile appeared similar between groups. CONCLUSIONS: ODN provided incremental BMD gains in osteoporotic women after alendronate treatment.
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