I remember an argument I had on FR some years ago with a ‘medical professional’ that was claiming that cancer wasn’t ever contagious. Almost worth digging through old posts to look for it.
Assuming he/she wasn't in *Veterinary* medicine then one can assume that he/she believed that human beings were being discussed.
My cancer — cancer free since 1988, by the way — isn’t contagious, as far as I know. However, I’ve been banned from donating blood for life.
As an aside, I don’t see groups of cancer survivors running around, insisting that they be able to donate blood, unlike the homosexual activists. I’m guessing that’s because, like me, most would be mortified if somebody developed cancer from a survivor transfusion.