The correct way to phrase this is that humans have a level of cancer that does not greatly impede the fitness of the species in having offspring. We didn't hill climb into other evolutionary protective mechanisms because they either were not discovered or did not convey appropriate fitness benefits.
Our evolutionary biology doesn't "care" if we get cancer. Just that we have healthy children and can rear them for one or two generations. That was a (locally) optimal algorithm.
We have plenty of in-built checks and protections in our molecular biology, and they are sufficient to expand the species.
Our evolutionary biology doesn't "care" if we get cancer. Just that we have healthy children and can rear them for one or two generations. That was a (locally) optimal algorithm.
We have plenty of in-built checks and protections in our molecular biology, and they are sufficient to expand the species.