As a preventive measure, vegetarian/vegan diets are correlated with lower incidence of some types of cancer. There's a little bit of research showing that survivors of these same types of cancer may do better afterward (as in lower likelihood of recurrence) with a plant-based diet, but it's too soon to draw any conclusions there.
But there's nothing to suggest eliminating meat can help combat cancer or increase survival rates. And good nutrition -- including and especially protein -- is critical while fighting cancer. Switching to a plant based diet usually makes this harder for people.
Don't throw around stuff like this. It's pseudoscientific, at best.
> thank you for the downvote, whoever you are.
You're welcome.