@NonlinOrg welcome to the forums!
Good news, the modern understanding of evolution actually includes a fully developed and coherent mathematical theory. So we can compare cancer and evolution to see if it is a match. And it is.
To be clear here, the "behavior" I am referring to is that dogs are sexually promiscuous and Tasmanian devils like to bite each other. That is it. Nothing really dramatic here, and it is just a way of pointing out that the evolution of parasitic tumors is dependent on the environment which is shaped by the behavior of its hosts.
Evolution often (usually?) depends on incidental and preexisting environmental conditions. So this is one way that these examples actually match evolution. A great example where we see good concordance between evolution and cancer, so thanks for bringing it up!
Any how, we would love to hear more about you. What is your position on origins? Are you a young or old earther? Are you a Christian, like me, that believes that God created everything? Do you hold to Ken Ham-like de novo creation or the progressive creation of Hugh Ross? Who are the thinkers here that you most agree with?
Before I get into extended debates with people, I find it best to understand our baseline positions and identify some common ground. Let's start with that.
I imagine this blog is yours? http://nonlin.org/ There are some well written posts there. Looking forward to seeing you write on there about cancer and evolution =).
And once again, welcome!