I know it is in pilot's DNA to want to get back to the cockpit, but you need to focus 100% of your thoughts and energy on getting well.

You can worry about the FAA later. Hopefully you have good disability insurance.

That said, I do know several pilots that came back after various cancers, but not the one you mentioned specifically.

Previous poster said it best: you have to be stable and not on any disqualifying medications.

good luck.