IMRT Intensity Modulated Radiation Therapy, and 3D Three Dimensional Radiation has a protocol similar to Protons. However, these types of Radiation are X-Rays (Photons) with the usual side effects. See Table for comparison of effects.
Note the top three items – bad news for the patient. The source is Dr. Metz at U. PA, he is the Doctor responsible for the new Proton Center at University of Pennsylvania around 2007.