Good questions to ask.
In my 14 year journey with cancers I have seen a lot of changes. And I thank God that medical science keeps testing and learning. It does get nuts when protocol changes, but I am glad scientists are still studying.
First breast cancer, stage one, no chemo required, but it was an option I chose not to take, and that was after two opinions.
When I got a new breast cancer I took the chemo then. Did I question my decision not to have chemo the first time? For about 5 minutes.
With the lung cancer, stage 1A, I got opinions from an oncologist and a pulminologist, both saying no chemo. when the later studies came out saying chemo was an option for stage 1, my oncologist said if i came into his office as a new patient, he STILL wouldn't recommend it.
I think it comes down to personal decisions. There are no guarentees either way.
gail