ERBB2 and neoplasm: By collecting pre- and post-NAT ultrasound imaging data from HER2-positive breast cancer and TNBC patients, we systematically analyzed the changes in the following parameters: maximum tumor diameter, tumor remission rate, peritumoral echogenicity, posterior echogenicity, tumor CDFI signal, lymph node remission rate, lymph node CDFI signal and hyperechoic medulla visible.