Hi Lauren, I flew to out to Mexico City for a cryoablation/immunotherapy treatment that has not yet been approved in the US. However, my Dr. is from the states, where we initially met him. We have had an amazing experience and I am currently going through a strong immune response that involves fever and flu like symptoms as the body's immune system attacks the cancer, no fun to be sure, but exactly what the doctors want to happen.I know treatments like this are not the norm, but they do involve FDA approved immunotherapies, just used in a combination that is not yet approved in the states. Brief Opdivo infusions upon return are the next step followed by several scans to measure progress. I hope to share more upon completion of this protocol that is useful for Stage 4 patients especially. God bless.