Abstract
Abstract Immunohistochemistry (IHC) is a technique used to quantify the expression of biomarkers in antigens and tissues by making them visible. The IHC technique is based on a binding reaction. Human epidermal growth factor receptor 2 (HER2) is a receptor protein present on the surface of cancer cells and used as an indicator for breast cancer Four paraffin-embedded breast sections were shown positive HER-2 expressed cells. The percentage of positive cells of carcinoma breast tissue was 6% whereas the percentage of normal tissue was less than 1%.