I had a recurrence on the chest wall 2 weeks after mastectomy. Er/pr +, her2 -, Onco 23, grade 3. Had 8 rounds of chemo to shrink tumor. Surgery to remove 3.2 cm of cancer with 3 bad margins. Surgeon initially refused to go in again. Went thru 2 tumor boards in Canada where I live. First tumor board in Alberta - 7 people- said no surgery go to radiation to take care of it. Second tumor board out-of-province approved surgery. Surgeon then agreed to re-excision to fix margins. Thank God! It is my understanding based on the Cambridge breast cancer calculator that surgery is 56% of the cure. They removed another 1.2 cm of cancer. That’s 1.2 billion cancer cells. Radiation is meant to mop up or sterilize a few hundred cells. The motto of the story is that no one knows how much cancer is in there until they remove the tissue and do the pathology. Otherwise it is simply guessing. The only way you will truly know and be reassured is to have another surgery to correct the margins. As one surgeon told me “a positive margin is a positive margin”. To be safe go in again and have the surgery as cancer cannot be underestimated. If you just have the radiation you might find that you have bigger problems later on. Best of luck to you!