How Good Is Tomotherapy For Treating Brain Tumor?

I am suffering from diffuse Astrocytoma brain tumor, grade II. The tumor has developed in the thinking side of my brain. Tumor is in the right thalamus of the brain. Doctors are saying surgery would be risky in my case as the tumor is quite deep inside.I am also being told that my survival rate is just 5 years. I want to know about the treatments available other than surgery. I have also heard about tomotherapy treatment which is an advanced version of radiation therapy. I want a complete removal of my tumor. I have even heard that most of the patients suffering from grade IV Astrocytoma (having survival time of 10-12 months) have got cured completely. Can anyone suggest me a complete cure?? I want to live longer. Please let me know asap about tomotherapy and other treatments availabIe. I would be thankful.