I've done the research, and millions of dogs go un neutered who don't get that cancer. Personally, I think poor diet and lack of exercise contribute more to any kind of cancer then being neutered or not.
P.S. Don't try to guilt me into neutering my boys, I will do what I see fit for them, and taking away their breeding rights before they are even adults are horrible. I'm not planning on breeding them right now, but who's to say I won't get them titled and plans change? You never know, for right now, they are just my companions, and potential agility buddies!