@kevinm4 You’re right about lung cancer vs prostate: we have way too many choices with way too many variations, so choosing the BEST treatment can be daunting!
At your age 72, IMRT is an excellent treatment if needed. Yes, it’s much longer than 5 SBRT (cyberknife, etc) sessions, but it is generally gentler on your insides most of the time.
Of course, I am allowing for exceptions at both ends of the spectrum, but IMRT (EBRT, etc) delivers the same amount of radiation as SBRT but over a 5-7 week span; so it’s less of a shock each time you get treated.
I had salvage therapy using IMRT -25 sessions as opposed to traditional 39. Studies showed increased SE’s short term but they were equal to the traditional method at 6 months; so, in effect, no difference.
You are G3+3 right now so AS is what you want; but if you become G3+4, treatment would probably be necessary and if you have the time IMRT is no big deal.
Phil