I had the same situation, bilateral mastectomy with clean lymph nodes... Yes, your breast surgeon might tell you that you are 'cancer free' at this point, (which is so awesome by the way!!) but as Andre said, chemo is a great way to make sure there are no residual tiny cells lurking that may be too small for imaging to see. Your oncologist may want to do an oncotype test to determine if your type of cancer would even respond well to chemo(some types don't). My oncotype test came in with a score of 19 which was just barely intermediate, but being in that grey area combined with my age(32), my onco recommended doing chemo and I agreed.... Interesting side note: If you do need the oncotype test, I found through some researching (and it ended up true with my own case as well) that the grade of your tumor seems to frequently correlate with your oncotype score. In other words, my tumor was grade 2 (out of 1, 2 or 3), and my oncotype test came back intermediate (out of low, intermediate or high)... Unfortunately I can't remember where I read that, sorry, so it may not be true in every case, but it was true for me. Sending you good vibes for your meeting with your oncologist!!!!