I agree it's really a tough decision. I also have Stage 1 IDC with the same treatment: surgery & radiation only. . When I asked my oncologist point blank about the re-occurrence rate. She seemed evasive but said this drug lowers re-occurrence by 50% (of whatever percentage I have). She was evasive on the % I have of re-occurrence. Anastrozole (I've only been on it for 10 months) is aggravating my arthritis - not fun. She also said because my tumor was ER+ my re-occurrence rate will NEVER be 0. That bothered me for some weeks, but now I have accepted that fact. I refuse to live in fear - but still wonder if the drugs help that much. I found this calculator to be of great interest. Someone posted this a while back. https://www.breastcancer.org/research-news/online-tool-predicts-hr-pos-recurrence-risk https://www.cts5-calculator.com/