Androgen-deprivation therapy (ADT), which is achieved through surgical or medical castration, has been a cornerstone in the management of metastatic prostate cancer (PCa) for the past 50 years. But the use of bilateral orchiectomy has been nearly eliminated in the U.S. because of cosmetic and psychological concerns.
Quoc-Dien Trinh, M.D., of Brigham and Women's Hospital and Dana-Farber Cancer Institute, Boston, and coauthors compared adverse effects of GnRHa and bilateral orchiectomy in 3,295 men with metastatic PCa (66 or older) between 1995 and 2009. The authors analyzed six major adverse effects, which were picked based on their effect on a patient's quality of life, the potential for increased health care costs, and on a previously described association with ADT use. The six adverse effects were: any fractures, peripheral artery disease, venous thromboembolism, cardiac-related complications, diabetes and cognitive disorders.
The study indicates surgical castration through orchiectomy was associated with lower risks of any fractures, peripheral artery disease and cardiac-related complications compared with medical castration with GnRHa. No statistically significant difference was found between orchiectomy and GnRHa for diabetes and cognitive disorders.
Men treated with GnRHa for 35 months or more were at the greatest risk of experiencing any fracture, peripheral artery disease, venous thromboembolism, cardiac-related complications and diabetes, according to the results.
The authors note limitations to the study, primarily its retrospective design which relies on historical data.
"In some patients who need permanent androgen suppression, surgical castration may represent a suitable alternative to GnRHa. However, other considerations must be contemplated when deciding between medical or surgical castration (i.e., young age, intermittent ADT)," the study concludes.
Sun et al. Comparison of Gonadotropin-Releasing Hormone Agonists and Orchiectomy Effects of Androgen-Deprivation Therapy. JAMA Oncol. Published online December 23, 2015. doi:10.1001/jamaoncol.2015.4917 [Abstract]