Not to push any one treatment, but Protons have been around for almost 15 years now and new facilities are being constructed in Oklahoma City, Hampton Roads, VA, Philadelphia , and northern Ill. The fact that only 5 centers exist in the US makes it difficult financially to go and stay some place up to 3 months. Currently the 5 US centers are running behind as more and more people are looking at this treatment option.
I have never heard one negative statement about proton treatment except it's cost. And now even Medicare covers 80% and as a retired militry person
Some say it will be the gold standard in 5 years.
Retired USAF Richard & Debbie on The Shores of Toledo Bend Lake Louisiana