I agree with Nelie, please talk with your doctors; also you could separate this is two (three) outcomes.

A) reasonable chance for cure
B) slowing down the progression
C) just palliative treatment

In either case there can be serious complications from treatment although for C the radiation/chemo dosage would be smaller and have less side effects. That might also be an option which you could take if the treatment turns out to be too much. So the decision could be deferred until later if that is of any use.
Perhaps this approach (go for it and decide later if continuation is desirable) is something to discuss with your team?


Markus