Diagnosis of Pathological Complete Response by Minimal Invasive Biopsy After Neoadjuvant Chemotherapy in Breast Cancer

Ultrasound guided VAB was used directly prior to breast conserving surgery or mastectomy. It was performed by experienced physicians (\> 50 ultrasound guided minimal invasive biopsies per year, \> 500 breast ultrasound examination of the breast per year). The needle was placed below or beside the target lesion according to physician's choice. At least six biopsies should be taken; up to 12 according to the physicians choice. After the VAB a clip marker was placed to highlight the position of the biopsy for specimen radiography and pathology.