Radiation therapy plays a strong role in breast cancer treatment – from the earliest stage to the latest stage of the disease. Many patients with breast cancer will benefit from radiation therapy, either as curative or adjuvant therapy, or as a palliative treatment. These patients are typically treated with 3D conformal radiation therapy over a course of seven weeks. Other patients may be candidates for brachytherapy. The term brachytherapy is derived from a Greek word meaning “from a short distance,” and describes the practice of treating cancer by placing radioactive material directly into the cancer or immediately around it.