The American Society for Radiation Oncology (ASTRO) has issued a new guideline, The Role of Postoperative Radiation Therapy for Endometrial Cancer: An ASTRO Evidence-Based Guideline, that details the use of adjuvant radiation therapy in the treatment of endometrial cancer. The guideline's executive summary is published in the May-June 2014 issue of Practical Radiation Oncology (PRO), the official clinical practice journal of ASTRO. The full-length guideline is available as an open-access article online.