The wisdom is to think horses not zebras when your hear hoofbeats. In my case, it is a zorse. The biopsy shows cancerous cells and the diagnosis is Ductal Carcinoma in situ September 26, 2007. This is considered Stage 0 cancer. When Dr. B does the surgery, the biopsy of the tumor finds that 1% is invasive. I will have to have radiation. The tumor is also tested to see if it is estrogen progesterone sensitive. It is, and I will have to take an anti-hormone, probably tamoxifen.