Hi! No, I had dcis. My oncologist did want me to start off with the 20mg first so I did. I was on it about three weeks before I called her. I had some back pain and cramping like my period was coming everyday. So when I called her she told me to take a week off then go to 10mg. I did that for 4 months . Then staring having some bladder pains/ cramps. So I just decided to go down to the 5mg. I have a follow up appointment with her in a few weeks. So we will see what she suggests. But so far the 5mg is very manageable. My bladder still acts up but not as much. No back pain at all any more. Although when I went to the 10mg my back felt a whole lot better than the 20mg. The 20mg just seemed way way way to strong for me.