Postmastectomy Radiation Therapy

This pocket guide is derived from recommendations in the ASTRO-ASCO-SSO Guideline. This resource is a practice tool based on an ASTRO-ASCO-SSO practice guideline and is not intended to substitute for the independent professional judgment of the treating physician. Practice guidelines do not account for individual variation among patients. This pocket guide does not purport to suggest any particular course of medical treatment. Use of the practice guidelines and this resource are voluntary. The practice guidelines and additional information are available at www. asco.org/breast-cancer-guidelines. Copyright © 2025 by American Society for Radiation Oncology, American Society of Clinical Oncology, and Society of Surgical Oncology. All rights reserved.