I will dig out my records. For one of those, I think it was close at 4.5% for the low risk cutoff. but I don't want to rely on memory. I did these tests at the 5 year point of AI treatment. Breast Cancer Index tells you benefit of continuing on anti-estrogen meds, since many now do 7-10 years. It gives risk of distant recurrence for years 5-10.
Prosigna Assay, also known as PAM50, also measures risk of distant recurrence in years 0-10 for those treated or going to be treated with anti-hormone meds.

You mentioned "throwing everything at" a cancer, including chemo. That concept went out the window with genomic testing. According to the Oncotype, there is no change in risk by not doing chemo for those with scores indicating no benefit. In fact, chemo may do more harm than good.

I will dig out my scores. I was shocked that with my Oncotype of 8, these other tests had me at high risk. Oncotype basically told me that chemo was not of benefit. But with grade 3 and LVI I had my doubts about low risk. Nevertheless I am 7 years out, knock on wood!