HER2-positive breast cancer with invasive micropapillary carcinoma component shows immunosuppressive microenvironment and resistance to neoadjuvant therapy
BackgroundInvasive micropapillary carcinoma (IMPC) is a rare histopathological subtype of breast cancer (BC) that shows a high incidence of human epidermal growth factor receptor 2 (HER2)-positive expression. However, the therapeutic efficacy of curren…