Hi @DaniJ, I had hormone positive cancer but her2negative. My cancer was about 18 mm. It was a grade 3 so very aggressive. I had a lumpectomy, chemo and radium plus hormone therapy. I did discuss both types of surgery and went with the lumpectomy in the end. I was lucky my bc was contained and no lymph involvement. I am large breasted so plenty to work with as my surgeon advised. If I had been small breasted a lumpectomy would not have been an option for me. I went with my surgeon advice ie the lumpectomy and so glad I did. Good luck with your decision.