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  Vol. 280 No. 24, December 23, 1998 TABLE OF CONTENTS
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Effect of Alendronate on Risk of Fracture in Women With Low Bone Density but Without Vertebral Fractures

Results From the Fracture Intervention Trial

Steven R. Cummings, MD; Dennis M. Black, PhD; Desmond E. Thompson, PhD; William B. Applegate, MD; Elizabeth Barrett-Connor, MD; Thomas A. Musliner, MD; Lisa Palermo, MA; Ronald Prineas, MD; Susan M. Rubin, MA; Jean C. Scott, PhD; Thomas Vogt, MD, MPH; Robert Wallace, MD; A. John Yates, MD; Andrea Z. LaCroix, PhD; for the Fracture Intervention Trial Research Group

JAMA. 1998;280:2077-2082.

Context.— Alendronate sodium reduces fracture risk in postmenopausal women who have vertebral fractures, but its effects on fracture risk have not been studied for women without vertebral fractures.

Objective.— To test the hypothesis that 4 years of alendronate would decrease the risk of clinical and vertebral fractures in women who have low bone mineral density (BMD) but no vertebral fractures.

Design.— Randomized, blinded, placebo-controlled trial.

Setting.— Eleven community-based clinical research centers.

Subjects.— Women aged 54 to 81 years with a femoral neck BMD of 0.68 g/cm2 or less (Hologic Inc, Waltham, Mass) but no vertebral fracture; 4432 were randomized to alendronate or placebo and 4272 (96%) completed outcome measurements at the final visit (an average of 4.2 years later).

Intervention.— All participants reporting calcium intakes of 1000 mg/d or less received a supplement containing 500 mg of calcium and 250 IU of cholecalciferol. Subjects were randomly assigned to either placebo or 5 mg/d of alendronate sodium for 2 years followed by 10 mg/d for the remainder of the trial.

Main Outcome Measures.— Clinical fractures confirmed by x-ray reports, new vertebral deformities detected by morphometric measurements on radiographs, and BMD measured by dual x-ray absorptiometry.

Results.— Alendronate increased BMD at all sites studied (P<.001) and reduced clinical fractures from 312 in the placebo group to 272 in the intervention group, but not significantly so (14% reduction; relative hazard [RH], 0.86; 95% confidence interval [CI], 0.73-1.01). Alendronate reduced clinical fractures by 36% in women with baseline osteoporosis at the femoral neck (>2.5 SDs below the normal young adult mean; RH, 0.64; 95% CI, 0.50-0.82; treatment-control difference, 6.5%; number needed to treat [NNT], 15), but there was no significant reduction among those with higher BMD (RH, 1.08; 95% CI, 0.87-1.35). Alendronate decreased the risk of radiographic vertebral fractures by 44% overall (relative risk, 0.56; 95% CI, 0.39-0.80; treatment-control difference, 1.7%; NNT, 60). Alendronate did not increase the risk of gastrointestinal or other adverse effects.

Conclusions.— In women with low BMD but without vertebral fractures, 4 years of alendronate safely increased BMD and decreased the risk of first vertebral deformity. Alendronate significantly reduced the risk of clinical fractures among women with osteoporosis but not among women with higher BMD.


From the Departments of Epidemiology and Biostatistics (Drs Cummings and Black and Mss Palermo and Rubin) and Medicine (Dr Cummings), University of California, San Francisco; Merck Research Laboratories, Rahway, NJ (Drs Thompson, Musliner, and Yates); Department of Preventive Medicine, University of Tennessee, Memphis (Dr Applegate); University of California, San Diego (Dr Barrett-Connor); University of Miami, Miami, Fla (Dr Prineas); University of Maryland, Baltimore (Dr Scott); Cancer Research Center of Hawaii, Honolulu (Dr Vogt); Department of Preventive Medicine, University of Iowa, Iowa City (Dr Wallace); and the Center for Health Studies, Group Health Cooperative, Seattle, Wash (Dr LaCroix).



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