Fracture risk in men with prostate cancer: a population-based study

Area of Science:

• Oncology
• Geriatrics
• Epidemiology

Background:

• Prostate cancer patients, especially those on androgen-deprivation therapy (ADT), exhibit increased fracture incidence.
• Limited data exist on fracture risk in men with localized prostate cancer.

Purpose of the Study:

• To estimate fracture risk in unselected community men diagnosed with prostate cancer.
• To assess the association between ADT and other risk factors with fracture risk.

Main Methods:

• Population-based retrospective cohort study of 742 men with prostate cancer diagnosed between 1990-1999.
• Follow-up for 6821 person-years, estimating cumulative fracture incidence and relative risk.
• Time-to-fracture regression models evaluated risk factors, including ADT use.

Main Results:

• Overall fracture risk was elevated 1.9-fold (9% absolute increase) compared to the general community.
• Fracture risk was higher in men not on ADT and further increased 1.7-fold in ADT-treated versus untreated men.
• Pathologic fractures accounted for 14% of excess risk in ADT users; traditional osteoporosis factors were noted in non-ADT users.

Conclusions:

• Men with prostate cancer have a significantly elevated fracture risk, even without ADT.
• ADT further increases fracture risk, largely due to associations with pathologic fractures.
• Indication bias may influence observed associations; fracture prevention effectiveness may be limited by advanced disease and pathologic fractures.