Breast Cancer Index is a genomic test (like the Oncotype) done with your surgical specimens, after 5 years of hormonal therapy. It gives risk and it gives benefit of extended hormonal therapy. Risk is on a scale, benefit is a yes or no. I also did the Prosigna Assay at the 5 year point.

I was high risk (5.7% risk of recurrence), no benefit with the BCI, High risk with the Prosigna (9%?) and originally had an Oncotype of 8 with 6% risk on meds (grade 3, LVI). I actually wanted to do more letrozole!