First... Get rid of "When it comes back." believe it is gone and then start working on making that happen.
When my husband was diagnosed 8 and 1/2 years ago, Duke was at the top of the heap. Note that is where Ted Kennedy went. (Same surgeon, same treatment as my husband) But since then, most of your good hospitals have caught up and are doing about the same thing. Go (or stay) where you are comfortable. If you do standard treatments you are likely to get standard results (hense your comment, "when it comes back).
It is my advise, as the researching wife of an 8 and 1/2 year, cancer free survivor) that you look outside of the box. We are under the complete belief that it is all about diet and lifestyle and we have the personal stats to back it up.
You might want to start out with the video "Forks Over Knives" and go from there. Do your own research, it is likely you could help save your son's life.
Healthy Blessings,
Lauren