Abstract
Breast cancer is the most prevalent disease for women. With advances in breast cancer screening, most breast cancers are now diagnosed in the early stages. With knowledge of different subtypes and their behavior, breast cancer treatment has become more individualized. Radiation therapy as one of the mainstays of breast cancer treatment has also been evolving. This review attempts to provide a summary of the most influential clinical studies that have driven the technological advances in radiation therapy for early-stage breast cancer.