I had a 35mm HR/PR+ IDC with no node involvement. My Ki67 was really low, which was one of the reasons my Onc suggested the testing. I had EndoPredict which is thankfully now a bit cheaper as Medicare now covers part of it (yay!!!). For me it was $3k but worth it because it meant less time off work in the end.
I did some of my own research on what the numbers would mean so that when I got the results I knew exactly what I wanted to do. I had decided if I was within 2 points of the 'cutoff' I would still get Chemo as the data showed the risks started to escalate slightly at that point. But that was just for my peace of mind. My results were well away from the cut-off, so I didn't have chemo.
Has your oncologist suggested this test? Do you know what your Ki67 is?