@mimzy do you have results for ER and PR? Grade? Her2 will also be important. If you are ER+ they will do an Onctotype test which will guide your treatment.

Even with a mastectomy, one out of 5 radiologists would have recommended radiation for me, but I declined. An aromatase inhibitor to block estrogen was a strong treatment for me because my ER (estrogen score) was very high as was my progesteron (PR). Despite Grade 3, high ki67% and lymphovascular invasion, I had a low Oncotype score and just did surgery and an aromatase inhibitor. I am nine years out.

Oncotype is done for ER+ and HER2- cancers. If HER2 is positive, treatment is different, and includes Herceptin, maybe another drug.

I think once you have all your testing and info, you can make a decision about radiation- and about the type of surgery you want. Aromatase inhibitors can cut risk in half if you are ER+ and the Oncotype will estimate your risk.