Skeletal response to teriparatide in real-life setting: effects of age, baseline bone density and prior denosumab use.

Objectives: Teriparatide (TPD) is an osteoanabolic agent used in patients with high osteoporotic fracture risk. Predictors of therapeutic response to TPD in real-life setting are not well characterised. This study investigated the influence of previous antiresorptive therapy, age and other patient characteristics on the skeletal response to TPD.

Methods: Retrospective study at the metabolic bone clinic, University Hospitals Leuven, Belgium. Patients with osteoporosis and a high fracture burden received TPD for 9-18 months. Bone mineral density (BMD) was measured at baseline, 9 and 18 months at lumbar spine (LS), femoral neck (FN) and total hip (TH).

Results: BMD at LS increased at 9 months (change mean (standard error) 6.8 % (0.7)  < 0.001) and at 18 months (8.0 % (0.9)  < 0.001), while BMD at FN and TH did not change significantly. Non-response in BMD change at the LS was seen with prior denosumab use (odds ratio 0.21, 95% confidence interval (CI) 0.049-0.912,  = 0.037). Changes in BMD at TH were significantly greater in younger patients and in patients with a lower baseline BMD.

Conclusion: TPD-induced changes in BMD at TH might depend on age and baseline BMD and at LS on prior denosumab use. The results suggest that these factors may be relevant for clinical decision making when initiating TPD treatment, although larger studies are needed to confirm these findings.