Has anyone used proton therapy? I was reading about it online for my dad. He has synovial sarcoma in the left lung. Primary and only location. It's pretty bad. They are doing chemo (past 9 months) and actually attempting to drain some fluid in his lungs today. The chemo was working, but then we took a break and the tumor grew, so back on the chemo train. Just curious about proton therapy since the oncologist said radiation would do more damage than good at this point, but I heard proton therapy is different. Sounds like the do it at MD Anderson.