@Frances54 I had the prosigna test and it was decisive in having chemo - I was borderline but given tumour size (no node) I had the test. My oncologist preferred it as it sorts tumours into luminal A and luminal B categories and Luminal B patients benefit from chemo. Prosigna calculates your risk based on the tumour of metatising - there is information about the test available on the website with the material the oncologist will give you. I am glad I had the chemo as I never wanted to think what if.