Hello @JaneinMelbourne,
This is a tough decision.
Did the Prosigna provide any useful "cut off" points? i.e. My Oncotype DX test result of 20 (at age 54 with very hormone receptive BC), indicated that chemo was of less than 1% benefit and not "necessary" AS LONG AS I do endocrine therapy. A score of 26 or higher would indicate that chemo is definitely of benefit. The cut off scores are lower for younger women.
Some people would go ahead with chemo just for that 1% reduction in risk.
My score was the deciding factor for me, and I did not have chemo.
If that's no use, do you have a rapour with your oncologist - ask them what they would do if it were them or their wife/daughter?
Best of luck.