"A patient who undergoes conventional radiation therapy is exposed to X-rays. As they pass through both healthy and diseased tissue, X-rays leave a track of damage - much like a bullet. This damage can help destroy tumors, but may cause significant harm to surrounding areas.

Protons cause less damage to healthy tissue as they enter the body, and deposit the majority of their destructive energy at the tumor site. As a result, normal, healthy tissue receives less exposure to radiation, resulting in fewer treatment complications."