A radiation oncologist is a doctor who specializes in the treatment of cancer patients, using radiation therapy as the main modality of treatment. Radiation can be given as a curative modality, either alone or in combination with surgery and/or chemotherapy. It may also be used palliatively, to relieve symptoms in patients with incurable cancers. Radiation oncologists work closely with other physicians such as surgical oncologists, surgeons, internal medicine subspecialists and medical oncologists, as part of the multi-disciplinary cancer team.