Quote Originally Posted by Seraphim View Post
From what I understand about cancer cells is that they are the person's own cells that for some reason continue to multiply beyond what they are designed to, and thus cause tumors, etc. As far as I know, they are made up of the person's own DNA?
they are the person's own cells, made from their dna, but mutated.

a child is also made from a person's dna, but mutated. (primarily by combining with someone else's dna, but random mutation also plays a small role)