I will comment on the "is it cancer" thing. The below is my opinion, based on the information I have found in the medical literature.

An ameloblastoma is incredibly rare. Having one metastasize is somewhat rare (low single-digit percentage) - but it is documented in the medical literature. That said, even medical professionals who know what an ameloblastoma is... almost certainly have no idea this happens. I only found it in the literature last year, not back in my 2007/2008 literature searches.

It's taken a long time for me to get around to the point of view that ameloblastoma actually is cancer.

Ameloblastoma is an uncontrolled growth of cells (tumor) which destroys the tissues around it and sometimes will metastasize. It meets all the requirements of cancer. It's just that the wider medical community hasn't caught up yet.

Not uncommon in science. We get new information and need to update our understanding of the world.

Anybody have a contact for who officially defines "is this cancer?" so that I can have a chat with them? Won't be the first time I've disputed world-class experts, usually successfully - even outside my area of expertise.