Validation of TAD in HER-2 with More Than 2 Lymph Nodes

The main objective of the study is to validate the DAT technique in patients with Her2-positive breast cancer who have more than two positive axillary lymph nodes at diagnosis. After receiving adequate oncological treatment and axillary assessment by ultrasound for complete radiological response, DAT and Berg level I and II lymphadenectomy will be performed to assess false negatives and positives, as well as their sensitivity and specificity.