Priorities

You're assuming that they don't get cancer. Almost everything with replicating cells gets cancer.

Aliens are different life forms. There is no 100% chance that any Alien would get it. I could get it, because I have replicating cells. But since the universe is so big, we can assume that there are aliens. Aliens who live on a different planet, different environments. They probably don't have the exact same molecular structure as us.

If the aliens don't have genetic code or replicating cells, what the heck would they have? But then again, we'd have no way of knowing either way.... Hmmmm....... I suppose in an infinite universe, it wouldn't be unlikely for aliens without replicating cells or DNA to exist, or aliens that simply don't have cancer.

Exactly. You can't say that everything in a universe that's continually expanding is exactly the same.

Actually, I think that Alens have been using Earth as their version of a Petri dish, sending all kinds of biological strains, to see if we can overcome them!