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Effects of teriparatide in postmenopausal women with osteoporosis on prior alendronate or raloxifene: differences between stopping and continuing the antiresorptive agent.

Author(s): Cosman F, Wermers RA, Recknor C, Mauck KF, Xie L, Glass EV, Krege JH

Affiliation(s): Helen Hayes Hospital, West Haverstraw, New York 10993, USA. cosmanf@helenhayeshosp.org

Publication date & source: 2009-10, J Clin Endocrinol Metab., 94(10):3772-80. Epub 2009 Jul 7.

Publication type: Research Support, Non-U.S. Gov't

OBJECTIVE: The aim of the study was to assess adding vs. switching to teriparatide 20 microg/d in patients on alendronate or raloxifene. DESIGN: We conducted a randomized, open-label trial. PATIENTS AND INTERVENTIONS: Postmenopausal women with osteoporosis on alendronate or raloxifene for at least 18 months added teriparatide (Add groups) or switched to teriparatide (Switch groups) for 18 months. MAIN OUTCOME MEASURES: We measured bone turnover markers (BTM) and bone mineral density (BMD). RESULTS: In the alendronate stratum, increases in BTM were smaller in the Add vs. Switch group [6-month PINP (64 vs. 401%); bone ALP (15 vs. 71%); betaCTX (27 vs. 250%); all P < 0.001]. However, at 6 months, total hip BMD increased more in the Add vs. Switch group (1.4 vs. -0.8%; P = 0.002). In the Add vs. Switch group, 18-month BMD increments were higher in lumbar spine (8.4 vs. 4.8%; P = 0.003) and total hip (3.2 vs. 0.9%; P = 0.02), but not in femoral neck (2.7 vs. 2.3%; P = 0.75). In the raloxifene stratum, increases in BTM were also smaller in the Add vs. Switch group [6-month PINP (131 vs. 259%; P < 0.001), bone ALP (31 vs. 44%; P = 0.035), and betaCTX (67 vs. 144%; P = 0.001)]. At 6 months, total hip BMD increase was greater in the Add vs. Switch group (1.8 vs. 0.5%; P = 0.028). At 18 months, increases in lumbar spine (9.2 vs. 8.1%), total hip (2.8 vs. 1.8%), and femoral neck (3.8 vs. 2.2%) were not significantly different between groups. CONCLUSIONS: In women with osteoporosis treated with antiresorptives, greater bone turnover increases were achieved by switching to teriparatide, whereas greater BMD increases were achieved by adding teriparatide.

Page last updated: 2009-10-20

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