Hi there @Caccal, I'm sorry you are in this position. You will find a great deal of support and experience from this online community. There is information about the Oncotype DX tumour profiling test on the BCNA website. https://www.bcna.org.au/news/2018/06/new-research-findings-confirm-the-benefit-of-the-oncotype-dx-tumour-profiling-test/
This test is designed to identify if chemotherapy will be beneficial for a specific group of people with early breast cancer. The target group have breast cancer that is hormone receptor positive, HER2 negative, and node negative. It sounds like your circumstances are different and so the benefit to you of chemotherapy is more clear cut. I agree with @kmakm that it would be good to have an understanding of why the doctors are recommending chemotherapy in your case. If you would like to talk with an experienced cancer nurse, or get more information or support you could call the BCNA Helpline on 1800 500 258 between 9am-6pm.