I am 4.5 yrs post R breast lumpectomy. I had 2 tumors measuring 2cm combined, ancillary node dissection with 5 of 10 nodes positive. I was staged IIIA, grade 2. I received 8 treatments of chemo and 6 weeks by 5 days of radiation and am currently on Tamoxifen 20mg daily. I recently had my annual mammo which showed a small cluster of microcalcificaton, which I asked to be biopsied. The result was negative for DCIS or invasive cancer, however showed atypical cells. How likely is it that I still have breast cancer and what about my lymph system?