Our basic and translational scientists studied the biological implications of two treatments for prostate cancer, accelerated radiation (SBRT) and conventionally fractionated radiation (CFRT), and were able to identify patients with a unique class of genetic biomarkers that puts them at significantly increased risk of toxicity following SBRT. Early results indicate that this information meaningfully impacts both treatment choice as well as overall toxicity, supporting the importance of the biomarker test for prostate cancer treatment choices moving forward.