A NDROGEN DEPRIVATION THERAPY (ADT) HAS BEEN the mainstay for the treatment of advanced prostate cancer for the past 7 decades. Surgical castration (orchiectomy) and the use of estrogens have been largely replaced by the administration of gonadotropin-releasing hormone (GnRH) agonists as the most common form of ADT used today.1,2 GnRH agonists are relatively easy to administer, avoid the well-known cardiovascular risks of estrogens and the psychological trauma of surgical castration, and allow the potential for the androgen blockade to be reversed. 1,2 In the armamentarium of drugs used to treat cancer, modern ADT is generally considered to be well tolerated; however, adverse effects of ADT can include loss of libido, hot flashes, weight gain, osteopenia, unique metabolic syndrome, and alterations in lipid profile. [1][2][3] More recent data suggest there may be an association between ADT with GnRH agonists and increased incidence of cardiovascular disease and cardiovascular mortality. This concern was first recognized from 2 population-based studies using the data from the national Surveillance, Epidemiology, and End ResultsMedicare database. A study by Keating et al 4 reported an association between ADT and increased risk of incident of coronary heart disease (adjusted hazard ratio [HR], 1.16; 95% CI, 1.10-1.21), myocardial infarction (adjusted HR, 1.11; 95% CI, 1.05-1.27), and sudden cardiac death (adjusted HR, 1.16; 95% CI, 1.05-1.27). A study by Saigal et al 5 noted that ADT was associated with an increased risk of serious cardiovascular morbidity (HR, 1.20; 95% CI, 1.15-1.26) during 5 years of follow-up of patients treated with ADT. Data from the Prostate Strategic Urologic Research Endeavor (CaP-SURE) database further confirmed the increased risk of cardiovascular disease among patients with localized prostate cancer treated with ADT. 6 These reports in combination with other studies showing an association between ADT and cardiovascular risk prompted the US Food and Drug Administration to issue a safety warning on October 20, 2010, requiring labeling on GnRH agonists about an "increased risk of diabetes and certain cardiovascular diseases (heart attack, sudden cardiac death, stroke) in men receiving these medications for the treatment of prostate cancer."7 The cumulative data to date support the warning issued by the Food and Drug Administration; however, these data leave practicing physicians and patients in a quandary when the risks of a GnRH agonist outweigh its benefits.The study in this issue of JAMA by Nguyen and colleagues 8 helps further clarify this dilemma. The authors report the results of a systematic review and meta-analysis of randomized trials to determine whether ADT is associated with cardiovascular mortality, prostate cancer-specific mortality, and all-cause mortality in men with unfavorable-risk, nonmetastatic prostate cancer. In 8 randomized trials that consisted of 4141 patients, the incidence of cardiovascular death among patients receiving ADT vs control was 11.0% (95% CI, 8.3%-...