Hi @RoslynT
I am sorry I did not have the Prosigna test but putting it into the search bar as @SoldierCrab suggests would be the best way of finding out about others experiences with it.
When asked, your oncologist can give you general statistics based on your particular cancer pathology. Of course no one can actually tell you for absolutely certain whether chemo will help you stay cancer free. I imagine the test you are talking about will give you more accurate information about how effective chemo would be against your type and grade of cancer.
I went with chemo as the general statistics for people with pathology similar to mine gave a 17% difference. This meant that for every 100 people with my type, stage and grade of cancer 17 more would stay cancer free if they had chemo. My oncologist broke down the statistics according to each of the treatments (surgery, chemo, radio and hormone therapy) that I could have. I found this helped me to understand how each treatment could improve my situation. Everybody will be different according to their individual pathology and there are no absolute guarantees.
Wishing the very best with whatever you decide.
xxx