Determinants associated with bone mineral density increase in response to daily teriparatide treatment in patients with osteoporosis

Introduction: Several factors associated with bone mineral density (BMD) increase are reported with daily teriparatide treatment, but there has been no systematic analysis to summarize these associations. The purpose of this study was to investigate the clinical determinants associated with BMD increase to daily teriparatide treatment. Methods: This was a retrospective study. We performed an analysis of 306 patients diagnosed with osteoporosis. Teriparatide was administered at 20 mu g/day for 12 months. The primary efficacy measure was a change in lumbar spine (LS) BMD from baseline at 12 months. To determine the response variables of BMD changes, we investigated the clinical determinants using univariate and multivariate analyses. Results: There was a 9.8 +/- 82% increase in IS BMD after 12 months. Prior bisphosphonate treatment and baseline procollagen type IN-terminal propeptide (PINP) concentration were significantly associated with IS BMD absolute response by univariate analyses. In the multiple regression model, patients with higher baseline PINP concentration had a significantly greater IS BMD absolute increase. Prior bisphosphonate use lost its correlation in the multiple regression models. Conclusion: Our results showed that baseline PINP concentration was a useful predictor of LS BMD absolute increase regardless of prior treatment. (C) 2014 Elsevier Inc. All rights reserved.