Lyn, its not any particular diet, just the bits I have picked up from research.
Im interested in what you say about kidneys and liver, that could provide some variety.
There have been studies that show a relationship between eggs and increased risk, possibly due to the very high Choline content. Not conclusive but enough indication for me to avoid them. I think I read this in a Harvard or ncbi study. Also Prostate.net discuss it.
Red meat I believe is not just about saturated fat, I was a bit brief above. All meat especially red meat and even more so poultry skin when cooked produce Heterocyclic Amines (HCAs) which are linked with cancer, especially when cooked quickly at high temperature. It also contains the growth hormones, Insulin - like growth factor (IGF 1)
Another I didn't mention is tinned tomatoes due to the BPAs produced by the plastic lining in the tin being easily absorbed by the acidity of the tomatoes.
Most of this is controversial but for me there is enough indication if not evidence to avoid these foods. I think why take the risk and my Veggie, Fish and White Meat diet is a healthy one any way.
Having said that I do have the very occasional treat and after two years I do miss a lot of the stuff I cut out.
If I remain recurrence free, at some point I may relax it a little.