Can chicken feet have cancer cells?

Maybe. Cancer is not a human patent.

In any case, chickens can eat cancer, because chicken cancer cells are harmless to people, that is, as a kind of nutrition, it is no different from ordinary chickens.

If you can't eat it, can you put a pig's head around a person's neck and grow it?

Can't you? !

Because they are heterogeneous substances to the human body, the body will reject them.