RecruitingPAS 1ml Magtrace® for Sentinel Lymph Node Biopsy in Breast Cancer PatientsThe purpose of this study is to provide prospective evidence in the US population of the frequency of skin discoloration and Sentinel Lymph Node detection rate in patients who have recevied Magtrace for Sentinel Lymph Node Biopsy (SLNB) and to evaluate the impact that skin discoloration has on patients when it does occur using patient reported outcome measures.