"Radiation oncology is the specialty of medicine that uses radiant energy for treating usually malignant disease and occasionally benign disease. Radiation oncologists are a fundamental component of the interdisciplinary practice of cancer treatment and may act as both consultants to referring physicians and primary oncologist to patients. Using a broad oncologic fund of knowledge, the radiation oncologist approaches the treatment of cancer with meticulous application of his/her technical expertise. If their knowledge base and relationship to the patient is like that of the medical oncologist (doctors who prescribe chemotherapy), the approach is more akin to the surgeon."
— Freeman, B. (2013). The Ultimate Guide to Choosing a Medical Specialty. 3rd Ed. Lange Medical Books/McGraw-Hill: New York. p. 435.