There have been a couple studies done that suggest vegetarian diets are modestly cancer protective (~10% lower incidence). There have also been some that link increased meat consumption with increased risk of cancer. It's absolutely not clear that eating meat causes cancer. Dietary habits change your cancer mortality risk and being a vegetarian probably correlates with something like a 1-4% decreased risk.
I would be wildly surprised if there weren't animal protein inclusive diets that are good in other ways that surpass the cancer risk reduction of "being vegetarian".