Many people with cancer have radiotherapy. Research shows that at least one in two people with cancer would benefit from radiotherapy treatment.

Radiotherapy is a treatment used against cancer. The treatment owes its existence to a combination of the scientific disciplines of physics and biology. As a general term, radiation means waves of energy, such as light or heat. The form of radiation used in cancer therapy is known as ionizing radiation - a high-energy form of radiation. It is named ionizing radiation because it has enough energy to remove electrons from atoms, thus forming ions.

Stereotactic radiosurgery is a procedure utilizing very accurate targeted radiation in large doses to effectively kill a tumor or destroy a lesion.  It is considered a noninvasive procedure that has been used as an effective alternative to surgery for treating small tumors.