Have a look at youtubes for talk by professor robert thomas regarding insulin resistance, all cancers, etc.
Insulin resistance is being linked to so many disease and illnesses.
He is a leading Oncologist in UK but thinks outside NHS guidelines and tries to help patients with different choices in lifestyle.
He doesnt just believe in food choices being hugely important but also stress and carcigens from environment etc.
Same as Aseem Malholtra cardiologist and instigator of the Pioppi lifestyle diet.. he has studied the life style of people whose lifestyle is getting their village to a life expectancy of 90.
Prof Thomas says that even bad genes although cant actually be changed for cancer, the way tgey act can be modified through different life choices.