I am glad you are looking for more information! If there is one thing I can really support it is getting informed. I am terrible at keeping track of links these days, but if you are thinking you would like a second opinion at Mayo there is a link for a request for appointment that I am sure another mentor could provide. @hopeful33250 or @johnbishop probably have it quite handy. They are amazing. Advocating for yourself is so important, especially when you are talking about cancer.
If not Mayo, are you close to a large center or teaching hospital?