Fig. 5

a Complete response to neoadjuvant therapy with absence of malignant cells and replacement of malignant cells by hyalinized fibrous tissue (thin arrow). Complete response to neoadjuvant therapy with absence of malignant cells and replacement of malignant cells by hyalinized fibrous tissue (thin arrow) and atrophied breast lobule (arrow head). c Incomplete response to neoadjuvant therapy with few residual clusters of invasive ductal carcinoma (arrow head) and replacement of tumor cells by hyalinized fibrous tissue (thin arrow). d Incomplete response to neoadjuvant therapy with few residual clusters of invasive ductal carcinoma (arrowhead). e Incomplete response to neoadjuvant therapy with clusters of residual invasive ductal carcinoma (arrowhead). f Incomplete response to neoadjuvant therapy with residual clusters of invasive ductal carcinoma (arrowhead). g Incomplete response to neoadjuvant therapy with many residual clusters of invasive ductal carcinoma (arrowhead). h Incomplete response to neoadjuvant therapy with sheets of residual invasive ductal carcinoma (arrowhead)