I'm not sure that I am qualified to answer this one. But I think there are a lot of healthy folks that get cancer as well. Think its an indescriminant killer.
I do believe that it can not hurt to take the healthy path as prevention. If you count all the wrong things to do-I did them and I got cancer-so I guess that I am a poster boy for the correctness of things not to do.
By getting healthy now-we can beat this thing. Kind of like quitting smoking, may not be a total reverse but an extender of life.
Good luck and keep swinging.