Localization of enzymes involved in the modification of HS chains. (A) CISH for NDST4 in IDC, negative for two ducts of normal appearance (arrows) and positive for the rest of the tissue, mainly consisting of tumor cells, magnification 200X. (B) CISH for HS3OST4 in IDC. The terminal ductal lobular unit showing an intense reactivity (arrow) while the staining patterns are less intense in tumor cells, magnification 100X. (C) CISH for SULF2 in IDC. At the bottom right unstained normal breast ducts are seen (arrow). Some adipose tissue is also present. Hybridization is positive for the rest of the tissue, constituted by tumor cells, magnification 100X. (D,E) Inmunohistochemistry for SULF1 in IDC. (D) Healthy tissue, terminal ductal lobular unit, magnification 200X (E) Intense immunostaining in tumor cells that grow into irregular ducts with lights, magnification 400X.