Hmmm.... Rabbits can get cancer? One time, my ferret had a tumor, but I didn't know animals could get cancer. My parents gave away all of our ferrets after that anyway. Now I have dogs.
Aww, that would suck.
I have a ferret that lives with my dad (as I couldn't bring him with when I moved, only cats are allowed here). His name's dongle... I've had other ferrets, too... A couple of which have passed on from old age and two we got for free (they were basically starving, poor things) that we "fattened up" a little and sold to a pet store (as 3 was too many at the time).
If you can get a ferret, get one.
I want another someday and really wish my one could live with me, but he's old and "on his way out" also.
I had a rabbit once, named Nightmare (she was albino) and only I could hold her... I'd like another bunny, too, ha ha ha.
Hamsters are fun, but I worry about their size. And they're not the same as a bunny, so I don't know why you can't have another rabbit (or have you not asked?).
And yes, basically any animal can get cancer.