The Oncotype DX screening
test is performed on each tumor sample to get the Recurrence
Score. The Oncotype DX test scores the breast tumor on 21 different genes involved in breast cancer and gives a Recurrence Score, or a number between zero and 100 that shows the chance of the breast cancer returning within 10 years of the original diagnosis.
The Recurrence Score is then categorized into one of three groups: low, intermediate, or high risk.