For what it's worth, I have a friend who's wife was diagnosed with stage 4 cancer. It's all over her liver, intestines, gallbladder, etc, etc. That was about 4 weeks ago. She isn't out of the woods just yet, but she is feeling and doing much better. She's doing a lot of natural things for it, but her primary protocol is IV Vit C in LARGE doses.
I also have a work buddy (in is early 30s) who got testicular cancer. He doesn't think environment or diet had/has anything to do with it and he opted for the chemo route. It did go into remission, but now they are trying to nurse him back from the brink of death.
I hope John chooses an alternative route. I hope he gets his health back.