Dose‐dependent effect of androgen deprivation therapy for localized prostate cancer on adverse cardiac events

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Abstract
Objectives To investigate the dose‐dependent effect of androgen deprivation therapy (ADT) on adverse cardiac events in elderly men with non‐metastatic prostate cancer (PCa) stratified according to life expectancy. Patients and Methods A total of 50 384 men diagnosed with localized PCa between 1992 and 2007 were identified within the Surveillance, Epidemiology, and End Results registry areas. We compared those who received ADT within 2 years of PCa diagnosis with those who did not, calculated as monthly equivalent doses of GnRH agonists (P < 0.001). The effect of prolonged (≥8 doses) GnRH agonist use on cardiac events was sustained across all strata of life expectancy; however, there was no effect among men with a life expectancy of P = 0.964). The use of GnRH agonists was associated with a higher risk of CHD (HR P < 0.001). Conversely, the use of GnRH was generally not associated with an increased risk of AMI or SCD, except for men who received ≥8 doses of GnRH agonists and had a life expectancy of ≥5 years, who were at a significantly higher risk of SCD (HR for life expectancy 5–10 years: 1.19, 95% CI 1.06–1.33; P = 0.003 and HR for life expectancy >10 years: 1.16, 95% CI 1.04–1.29; P = 0.006). Finally, orchiectomy was not associated with overall cardiac events, AMI or SCD, and was protective with regard to cardiac‐related interventions (HR 0.78, 95% CI 0.68–0.90, P = 0.001). Conclusion Exposure to ADT with GnRH agonists is associated with an increased risk of cardiac events in elderly men with localized PCa and a decent life expectancy. Clinicians should carefully weigh the risks and benefits of ADT in patients with a prolonged life expectancy. Routine screening and lifestyle interventions are warranted in at‐risk subpopulations treated with ADT.
Funding Information
  • Vattikuti Urology Institute
  • Women of the University Medical Center Hamburg-Eppendorf

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