Radiotherapy combined with hormonal therapy in prostate cancer: the state of the art

Piotr Milecki^1,2, Piotr Martenka¹, Andrzej Antczak³, Zbigniew Kwias^3
1Department of Radiotherapy, Greater Poland Cancer Center, Poznan, Poland; ²Department of Electroradiology, Medical University, Poznan, Poland; ³Chair of Urology, Medical University, Poznan, Poland

Abstract: Androgen-deprivation therapy (ADT) is used routinely in combination with definitive external beam radiation therapy (EBRT) in patients with high-risk clinically localized or locally advanced disease. The combined treatment (ADT–EBRT) also seems to play a significant role in improving treatment results in the intermediate-risk group of prostate cancer patients. On the other hand, there is a growing body of evidence that treatment with ADT can be associated with serious and lifelong adverse events including osteoporosis, cardiovascular disease, diabetes, and many others. Almost all ADT adverse events are time dependant and tend to increase in severity with prolongation of hormonal manipulation. Therefore, it is crucial to clearly state the optimal schedule for ADT in combination with EBRT, that maintaining the positive effect on treatment efficacy would keep the adverse events risk at reasonable level. To achieve this goal, treatment schedule may have to be highly individualized on the basis of the patient-specific potential vulnerability to adverse events. In this study, the concise and evidence-based review of current literature concerning the general rationales for combining radiotherapy and hormonal therapy, its mechanism, treatment results, and toxicity profile is presented.

Keywords: prostate cancer, radiotherapy, androgen deprivation, combined treatment