I had Stage 1a ductal carcinoma that was ER/PR + HER2- and ki67 of 1%. I had a 8mm tumor and no lymphovascular invasion. My Oncotype came back at 29. The oncologist suggested chemo and I wanted to do the Mammaprint test since the Oncotype result was so unexpected. The Mammaprint came back as low risk of recurrence and no chemo benefit. My oncologist took my case to the tumor board who said no chemo and I also consulted with two additional cancer doctors who both said no chemo. I ended up not doing chemo and will never know if I made the right decision. My onco dr subsequently ran the RSCLIN model which includes other data like age, tumor size, grade, recurrence score and number of lymph nodes involved and this model showed very low benefit to chemo. This was 6 years ago.