Cancer is a serious desease and we have many theories of it's cause.  From coffee to smoking!  The interesting thing is that TSE's are mostly looked at from a transmission point of view.  What's the Cause, that hasn't been proven yet.  Even more interesting is that "science" is able to pin the blame on infected beef that may have been a factor in 150 deaths when the sporatic CJD is responsible for 350-400 US deaths per year. ( the same rate as the UK) 1 in a million, while a town in Slovakia has 1 in 1000 cases, interesting!