Radiation therapy uses high-energy rays to kill cancer cells, which has different side effects such as hair loss in the treated area, skin pain, swelling. fatigue/weakness and more. Advances in all types of treatment will improve doctors' ability to combine chemotherapy, radiation therapy and surgery for the treatment of all stages of lung cancer. All forms of cancer are treated most successfully in their early stages, which has sparked interest in screening. for lung cancer before it causes symptoms. Advances in imaging techniques, such as low-dose helical CT, are currently being researched and may help find better ways to diagnose lung cancer early. Genetic testing to determine which people are at higher risk of lung cancer is also underway.