RECENT ADVANCES IN RADIOTHERAPY MODALITIES FOR PROSTATE CANCER.

ABSTRACT

Radiotherapy is the attractive treatment option for prostate cancer and has a clear role in all stages of the disease. Over the last decade, advances in technology, imaging capabilities, and improved radiobiological understanding have deeply transformed radiotherapy for prostate cancer, allowing dose escalation and wide adoption of hypofractionation. Furthermore, the integration of magnetic resonance imaging (MRI) and improved physical precision of dose delivery have given an impetus to additionally target intraprostatic tumor lesions, previously agnostic to conventional radiotherapy target definition concept. The emerging data from randomized clinical trials and observation research show that ultra-hypofractionation is a safe approach while further follow-up is needed to assess its efficacy compared to standard fractionation. There is an ongoing uncertainty surrounding true alpha/beta ratio for prostate cancer since hypofractionation has so far failed to yield theoretically envisioned superior biochemical control outcomes. Finally, recently published randomized trial settled ongoing controversy regarding the role of elective pelvic lymph node radiotherapy in patients with high-risk prostate cancer, showing clear benefit when pelvic nodes were treated to 50 Gy. The role of partial gland dose escalation/tumor boosting is evolving, and more data is needed to adopt this approach in routine clinical care. Going forward, molecular imaging will be crucial to assess biology of the disease, predict a response potentially, and optimally personalize radiotherapy treatment decisions. In this narrative review, we critically analyzed the published literature and provided practical summary of recent prostate radiotherapy advances for busy clinicians.