I joined bc.org after i had started treatment. For me, I was not given an AI to shrink my tumor, but rather Chemo. It was 5cm. After this decision was made, I got my genetic test back. I carried the BRCA2 mutation. The chemo was supposed to shrink the tumor. It did, but only by 1/2. The margin needed to remove it would still make a lumpectomy a no go. I need to add that not being large breasted, I never thought breast cancer would happen. Skin cancer yes. This was from 2021. I know today that getting info from bc.org and Mayo provided me with the courage to ask questions and how to be an advocate for myself. I had 3 sentinel nodes with no cancer. A result that is different among many of us.
There is so much research out there now. More knowledge will give more acceptance for your own choice.