Hi Louise, I was borderline for radiotherapy too though my situation was different. I had ICD grade 2, 33mm tumour on scans,clear nodes. I had chemo first and just had 8mm DCIS after final pathology from my mastectomy. I was not in a clear category for needing rads but they will never know how big my tumour really was and there was evidence of lymphovascular invasion. My onc who tends to treat aggressively said she would have rads in my position for all the reasons you say. However rads also have side effects and had a significant affect on my reconstruction. Good luck with your decision
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