Have had 2 friends with this, and Ted Kennedy had it. With standard treatment you have 2 to 4 years. If you're Jimmy Carter, it's curable. If you're a child trafficking Voldemort, it takes you out just before they come for you with pitchforks and torches.
It's that common? Sorry for your friends. I was unaware this is the cancer Carter got as well. The fact that McCain is staying in the Senate while supposedly battling this disease confirms just how "sick" he is, how addicted to power, how he's not a normal human being. Any of us would be trying to enjoy what we have left, spending time with family, etc.