Biopsy report and questions

I had surgery Sept 1 and just received biopsy report over phone.  My original needle biopsy had grade 2 with a 2.5 tumor.  I received AC and Taxol chemo for 16 weeks before surgery.  The report said there was a very small spot left of ductal carcinoma in left breast with clear margins.  They had to take a cluster of 11 nodes which were clear because the sentential node injections didn't move.  Have any of you had to have additional treatment after having chemo and having a spot left?  I have a IHC positive with estrogen 30%, Progesteroin 5% and HER-2 IHC negative with Ki-67 of 75%. These numbers were from the first biopsy but haven't seen the surgical numbers yet.  Will see those Thursday when hopefully I will get the remaining 2 drains removed.  I have a bilateral mastectomy with right breast clear.