If I understand Colin's point correctly, I agree no diet, Vitamin or mineral supplementation, or ideal lifestyle can cure cancer. G-d is the healer and even can heal without any of those things.
Don't get me wrong, I do believe in eating G-d's wholesome foods in it simplest form -- as much raw being ideal, including all the other 7 lifestyle laws.
The thing is, the spirit is what heals or destroy. I have heard of many sick people reforming and getting sicker. At times they dragged their whole family in their path of destruction all because their spirit was out of fear and being judgmental towards others.
The goal shouldn't be healing but surrendering our life to Jesus and accepting His will whether it be.
In 2009, I heard a live testimony of Gloria Bentzinger who had brain Tumor. This is one of the cancers that are rare to recover from. They had scheduled to operate on her, and conducted another MRI just prior to the surgery, and it totally disappeared. What happened? She didn't go to Weimar and follow the NEWSTART program, or whatever. She simply surrendered to Jesus. And for some reason in His wisdom, He saw fit to heal her.
You can read her testimony here and find it on page 8.
http://www.adventistarchives.org/docs/RH/RH19970116-V174-03__C.pdf Here's a quote of what she learned from her experience :
"Our twisted views on the priority of immediate physical healing override the more important emotional and spiritual healing that God gives. My encounter with God when I submitted to His will was the most beautiful part of my experience. The tumor disappearing was just the "icing on the cake".