Procure is the Proton Therapy Treatment Center in the metro area located in NJ. I know someone from another board who was treated there, after a recurrence, but cancer may have returned again. One thing, there are not many studies done with proton therapy, and new therapeutic equipment needs no clinical trials for approval like chemo does before approval, and just needs to meet or exceed the current type of treatment equipment it is to replace, and submit a form to the FDA to be fast track approval. I guess others, including MSKCC, are waiting to see more results. On Dr. Lee's video, she mentioned they may be looking into obtaining.
Do what you think is best, on medical advise, and tumor shrinkage first sounds like a good plan. I wish, and hope the best.