Eighteen Months of Treatment With Subcutaneous Abaloparatide Followed by 6 Months of Treatment With Alendronate in Postmenopausal Women With Osteoporosis: Results of the ACTIVExtend Trial

To assess the efficacy and safety of 18 months of subcutaneous abaloparatide (ABL-SC) or placebo (PBO) followed by 6 months of alendronate (ALN) (preplanned interim analysis). ACTIVExtend, an extension of ACTIVE, enrolled patients who completed 18 months of ABL-SC or PBO in ACTIVE to receive up to 24 additional months of open-label ALN; there was 1 month between the studies to re-consent patients. Of 1243 eligible ACTIVE patients, 1139 (92%) were enrolled in ACTIVExtend beginning November 20, 2012. These results are from a prespecified 6-month interim analysis (cutoff date, June 2, 2015); the study is ongoing. Findings indicated percentages of patients with new morphometric vertebral fractures: PBO/ALN, 4.4% vs ABL-SC/ALN, 0.55%; relative risk reduction, 87% (relative risk, 0.13; 95% CI, 0.04-0.41; P