Hi @Temple. Please bear in mind that you'll get a higher proportion of people having troubles with their AI here than in the general population, because they come here seeking advice and help when they're having trouble!
I had a genomic test to see whether chemo would be beneficial on my cancer and it was a clear yes. So I took a deep breath and did it.
As to assessing the benefits of various treatments, you could ask your oncologist to take you through a couple of online tools that show the benefit to your cancer specifics. They translate to an averaged percentage improvement to survival. They're a bit broad brush but they serve as an indicator.
It's your body and you're entitled to accept or decline any treatment. This question comes up regularly here and my response as always the same: make the decision that, should the worst happen and your cancer returns, you'll be comfortable with. No regrets, either way, you want to have no regrets. There's no right or wrong, just make sure you're not left saying "what if". K xox