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Risk Factors for Denosumab Discontinuation in Patients with Postmenopausal Osteoporosis.

OBJECTIVES
Persistence with treatment is key to achieving successful treatment outcomes in patients with osteoporosis. We investigated risk factors for denosumab discontinuation in patients with postmenopausal osteoporosis (PMO).


METHODS
A total of 333 patients with PMO who had never received osteoporosis treatment were included in this study. Baseline demographics and retention rate of denosumab were evaluated in all patients. Univariate analysis was performed in patients divided into two groups according to whether they had continued or discontinued denosumab. A Cox proportional hazards model was used to determine risk factors for denosumab discontinuation.


RESULTS
Mean age was 80.7 years, body mass index (BMI) was 21.5 kg/m2, and T-scores for the lumbar spine and femoral neck were -2.7 and -2.8, respectively. The retention rate of denosumab at 36 months was 50.3%. Patients who continued denosumab were younger and had higher BMI, serum albumin (Alb) levels, and lumbar spine bone mineral density, and fewer vertebral fractures (VFs), compared with those who discontinued denosumab. The Cox proportional hazards model revealed that a low BMI, low serum Alb levels, and a high number of VFs are independent risk factors for denosumab discontinuation.


CONCLUSIONS
A low BMI, low serum Alb levels, and a high number of VFs were associated with denosumab discontinuation in patients with PMO.