I believe our immune systems and maintenance processes co-evolved with caloric scarcity plus the cellular stress of borderline starvation to keep onco processes

I believe our immune systems and maintenance processes co-evolved with caloric scarcity plus the cellular stress of borderline starvation to keep onco processes in check. It's curious that cancer and neurodegenerative diseases tend to be mutually exclusive. I wonder if there is genetic &| epigenetic basis for it.