The radiolabeled Tc-99 colloid or phytate (500 Mbq) will be injected into the primary tumor 2 hours before surgery. A localized scintiscan will then be performed to confirm the radiolabeling of the sentinel node before surgery and for documentation. Isosulphan blue dye will be injected subdermal (0.5ml) over the tumor and intraparenchymal (3-4ml) towards the axilla 10-15mins before incision.