Goggle Predict Breast Cancer Tool.

The OncotypeDX test will give the odds of recurrence if one takes aromatase inhibitors AND has not had chemo or radiation previously for the cancer (the sample of which is tested by Oncotype, looking at 21 genes determined to be best predictors). To calculate the rough odds of recurrence if one does not take the drugs, one can double the risk given as it's thought that the adjuvent anti-hormone meds 'can' reduce the recurrence risk by 42-50%.

Google OncotypeDX for more info.