I am a believer in the benefits of anti-inflammatory diet and lifestyle. I have done a review of the current literature and while I can't produce reams of data directly linking cancer and inflammation I think some of it is just common sense. Our typical American diet consists of far too many Omega 6's and 9's which both lead to inflammation and not nearly enough Omega 3's which reduce inflammation. To top it off 65% of our adult population is either overweight or obese also promoting inflammation. Additionally, there are many components in our environment that also promote inflammation.
Cox-2 inhibitors (aspirin, tumeric/curcumin, etc) are known to be anti-inflammatory and may have some benefit in cancer prevention and prevention of recurrence although I can't say the research is definitive. I think we are safe to say that a diet rich in Omega-3 fats, high in fruits, vegetables and whole grains, moderate in calories (portion size) is excellent for just about anyone. I am pasting a nice article from the AICR newsletter from Fall 2008 addressing the issue and an anti-inflammatory pyramid from Dr. Weil's website. Please note on the pyramid that soy is included but may not be appropriate for everyone. The same is true for "supplements". I believe it is best to get nutrients from diet whenever possible.
http://www.aicr.org/site/DocServer/S...pdf?docID=2541
http://www.drweil.com/drw/ecs/pyrami...odpyramid.html