It is sad that ur friend has it but do not worry, ur pal has still a chance :)
I have posted on Cancer Forum already with loads of info about this issue and to my delight my post was marked with 'R'! It meant for me that it would be seen by many people. And it is the main thing for me! :))
I will repost this link for u (and many others who is new here). But for u I just copy a few links from that long post just to 'get the idea' what it is all about.
One of the books I mentioned for reading over there (in that post):
Recovery From Cancer (and how she beat the odds) by Elain Nussbaum (this book is about a lady who had a bad stage of a cancer and went for chemo. One of her legs were amputated, then when cancer spread, her both breasts were removed and after it did not help and cancer kept spreading she discovered plant based diet and went for it. The result? Cancer WAS GONE!