“..so if he beats this we could have this guy for another 20 years.”
Trust me, he isn’t going to beat this. He could well be gone before the end of the year, even with advanced treatment. In any event, he will be gone from the Senate in a matter of days if he has a shred of decency.
He might. They caught it very early, and got it all out. He'll have expidited access to the latest treatment options.
People with money/connections can get scans and tests frequently and regularly, and catch these things very early on... which greatly improves their odds of beating them.