Radiation oncology is that the medicine concerned with prescribing radiation, and is distinct from radiology, the utilization of radiation in medical imaging and diagnosis. Radiation could also be prescribed by a radiation oncologist with intent to cure ("curative") or for adjuvant therapy. It may even be used as palliative treatment (where cure isn't possible and therefore the aim is for local disease control or symptomatic relief) or as therapeutic treatment (where the therapy has survival benefit and may be curative). It is also common to mix radiotherapy with surgery, chemotherapy, hormone therapy, immunotherapy, or some mixture of the four. Most common cancer types are often treated with radiotherapy