So far, Apple Computer CEO Steve Jobs has.
his was a rare form of pancreatic cancer that is much more survivable than ordinary. The pancreatic cancer that most people get is highly lethal. With surgery, the five year survival rate under the very best of circumstances (caught early, done in a leading research hospital, etc) is under 40%. With other risk factors, it goes down from there. And without surgery, the survival rate is essentially nil. And because it has no symptoms until the cancer is advanced, most people aren't diagnosed until it's too late for surgery.
And the surgery is pretty radical, so you have quality of life issues even if it's successful--for instance, without a pancreas you're an insulin-dependent diabetic for the rest of your life. So some patients opt not to have the surgery even if it gives them a slight chance at recovery.
I know about this because a family friend was recently diagnosed, so I've been reading up on it.