All the cells in a human body grow and divide to form new cells. This is a normal process. But when these cells start growing at an abnormal rate it is cancer. This condition implies the abnormal proliferation of cells. It basically starts at one site in your body and then spreads to other areas. One of the most common treatment for cancer is radiation therapy. It is usually a preferred treatment option when there is early diagnosis. Your physician may administer it as a stand-alone treatment or he may combine it with some other procedure. This is a localised