I too was diagnosed with DCIS with 4 micro-invasions. My surgeon was 99.9% certain that she removed all of it but because the micro-invasions were so close to breaking out of the duct she removed my sentinal Lymph node to be 100% certain. Thank goodness everything was contained in my duct. After my lumpectomy, I underwent 25 rounds of radiation and am now on Tamoxifen for 5 years. I'm 2.5 years in. Is anyone else on Tamoxifen for DCIS by any chance? I'd love to hear from some of you about being on the drug. Thank you! It's nice to finally find a forum for this topic.