Fracture types and risk factors in men with prostate cancer on androgen deprivation therapy: a matched cohort study of 19,079 men

The Journal of Urology
Shabbir M H AlibhaiLawrence Paszat

Abstract

Accumulating evidence shows that androgen deprivation therapy is associated with osteoporosis and fragility fractures of the spine, hip and wrist. One study suggested that androgen deprivation therapy may also be associated with nonfragility fractures in older men. Whether other clinical risk factors independently increase the risk of fractures is not certain. Using linked administrative databases in Ontario, Canada, we matched 19,079 men 66 years old or older with prostate cancer with at least 6 months of continuous androgen deprivation therapy or bilateral orchiectomy with men with prostate cancer who had never received androgen deprivation. Matching variables were age, prior cancer treatment, diagnosis year, comorbidity, medication, prior fractures and socioeconomic variables. Primary outcomes were a typical fragility fracture of the spine, hip or wrist and any fracture. Independent predictors of fracture outcomes were assessed with Cox proportional hazards models. At a mean 6.47-year followup androgen deprivation therapy was associated with an increased risk of fragility fracture (HR 1.65, 95% CI 1.53-1.78) and any fracture (HR 1.46, 95% CI 1.39-1.54). Independent predictors of fragility and any fracture were increasing age...Continue Reading

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