David there really is only one way to approach this monster of a disease,and that it is to hit it hard with every available weapon you are offered.Dont ever be fooled in to thinking that you can turn your back on it for a moment.
If you have questions about the quality of your fathers life in the long term racked up aginst the quality of his life short term during treatment,then get a second or even a third opinion about his treatment options.I would hazard a guess that you will get the same advice from all of them ,but you need to be happy in your own mind that you are getting the best options available for your dads particular case and future recovery.
Radiotherapy is hard there is no doubting that,but if it is necessary to save your dads life it will become another hurdle you will have to face,and everyone here will do their best to walk you through every twist and turn.


good luck with whatever you decide

liz