You can ask your oncologist for the statistics for people with a similar diagnosis. I did this at my first appointment and this helped me to understand what difference chemo and hormone therapy would make to my chance of recurrence. For me the difference was 20% for chemo and then 30% for hormone therapy. My pathology was different to yours as I had lymph node involvement. She wrote all this information down for me along with the info about the type of chemo etc. If you are not happy with the reasoning behind the recommendation for chemo, it might be a good idea to get a second opinion. Chemo is a major treatment and you have a right to understand what you will be achieving by putting yourself through it.
Hope you can get an answer. Deanne xxx