Hi Anna 15, I have finished chemo and mastectomy. My cancer was a similar size, lymph node negative and estrogen receptive however as another relative also had breast cancer, my medical team thought it prudent to be tested for the BRCA 2 gene . I was positive hence the mastectomy over a lumpectomy, chemo and now on estrogen blockers. As far as I could understand, the BRCA 2 gene has indicated that I am susceptible to breast cancer of various types including hormone. The BRCA 2 mutation does not lead itself towards any one type of breast cancer. If possible I would be discussing your relative’s cancer with your medical team and asking if a gene test for BRCA 1 and 2 would be appropriate. This may then lead to a slightly different recommendation for your ongoing treatment plan. Wishing you the best!