So if you have a population of humans who, for generations, have selected genes via inbreeding, would it be a thing to have transmissible cancer? I'm thinking

So if you have a population of humans who, for generations, have selected genes via inbreeding, would it be a thing to have transmissible cancer? I'm thinking of the Amish population near my hometown that has definite inbreeding traits and particular disabilities associated with inbreeding in their bloodline/families. Would it be possible for them to develop some kind of transmissible cancer?