@roroj Hello....... The options I was given for my Stage 1 Invasive Lobular Cancer were lumpectomy or mastectomy. I chose a bilateral mastectomy because my Stage 0 cancer was in my left breast and my Stage 1 invasive cancer was in my right. I wanted to eliminate the risk of cancer in both breasts, given my situation of following my cancer for two years prior to the invasive cancer diagnosis. However, lumpectomy would have been a reasonable choice as well - I had lumpectomy in the left Stage 0 breast initially. My tumor size was quite small. I don't remember now the exact size. I was lucky that there was no spread to my lymph nodes and that was my goal, to stop the cancer before it had a chance to grow further and spread. Another goal of mine was to avoid radiation and chemo, which I did. I hope I answered your question, but if you have further questions, please let me know. I'm happy to help and support you. I know how difficult this process can be. Hugs to you!