My sister told me to have it. Once she said that I dared not because in the back of my mind if I got secondary breast cancer I know what she would say.LOL. I had clear margins and clear lymph nodes but did have small vascular invasion so that was the real reason. I thought if anything had got into blood stream chemo would mop up. I did not do well with chemo. I was very sick and I blame chemo for my system not tolerating aramatose inhibitors which gave me extra 20% survival rate. We are all very different and our bodies react very differently. Again, had thete not been vein involvement no way would I opt for 4 rounds of chemo for 4%. Am I glad I did it? There is no way of determining that as I will never know if I would have been able to tolerate aramatose inhibitors if I hadn't 'gone ahead. Nor will i know if it helped me survive or not. There is just no way to tell. God luck..