Gamma Rays are caused when subatomic particles interact. Gamma Rays can induce DNA alterations, some of these alterations can cause Cancerous Tumors. However in an operation called Gamma Knife surgery, concentrated Gamma Ray waves can help to reduce the size and infectiousness of a cancer. Large doses of Gamma Radiation will kill the Patient ( Search Radiation Poisoning) Even if procedures such as bone marrow transplant are underway the patient will surely die due to Gamma Radiation Poisoning.