You'll be hard pressed to find anything stimulatory/anabolic that does not stimulate already existing cancers. The simplest example, protein consumption can also promote cancer growth (I can find a ref if pressed, I'm just lazy right now).
On the other hand, this study found that a high protein, low carb diet can reduce cancer growth in mice[1]. This is not to say that what you said is inaccurate. I just see your comment and the first thing I think is "uh oh, can I still eat paleo?"
Given that anabolism can promote tumor growth, do weightlifters tend to have more intense bouts of cancer?
Remember that a high protein low carb diet is significantly different from a normal high carb high protein diet.
As to the second point the best answer I can give you is maybe. Unfortunately different cancers have completely different mechanisms, while high protein may be bad for mammary cancers it might be good for bone cancers. So it's really situational.
So what you're telling me is I can't have complete knowledge or control over my life? How am I going to live forever, then??
Edit: but seriously, thanks for the response. I think a lot of people are torn by trying to make basic decisions like this, and making sense of conflicting findings is pretty frustrating. Seems like a lot of carbs is bad, though, so I'm going to go with that.
