@dada I agree your Oncologist will not and is not allowed to advise you on your decision, it does have to be yours unfortunately.
I never had percentages either, I had no choice with chemo as I had a recurrence same spot in the scar tissue inspite of radiation and 4yrs of tamoxifen. So in my yearly checkup it was found Stage 2 Grade 3, automatic chemo but no radiation as Id already done it. 1 yr later I did a mastectomy/reconstruction as prevention, didnt want to go through another recurrence. I look back at my path and would have chosen differently had I known what my path was going to be. The thing is we make the right decisions at the right time. For me personally I would have opted for a mastectomy and no treatment as at DCIS originally I think that would have stopped it completely.
You are guided by the Oncologist and I was so against chemo, horrified!!! BUT...I thought to myself as much as I detest having to do this at least I knew I had done everything possible, so I would have no regrets. Eventhough I did everything 1st time...you have to try and find what you feel is best for you...no stats really can do that.
All the best x M