Hi- no my son has not been to Mayo so I don’t have any input on them. But as for MSK- they are sooooo on top of everything. We also see oncologists in our home state (a large cancer center as well) and the difference is VERY obvious. I believe that if you are dealing with something as rare and as aggressive as synovial sarcoma, patients/families need to go to top cancer centers. I just know that for this type- MSK is amazing.