Its good that he can afford to continue with his oncologist, not everyone can.
Check this out:

Sen. Tom Coburn (R-OK) recently announced that he’s going to resign his U.S. Senate seat before his term expires. But it’s not clear to what extent this decision was influenced by the fact he’s suffered a relapse of prostrate cancer. He said in a video making the announcement public that, “I am now convinced that I can best serve my own children and grandchildren by shifting my focus elsewhere.” So he will soon retire.