Also called erbB-2 (or ERb-2) -Receptor tyrosine-protein kinase
HER2 is a protein that helps breast cancer cells grow quickly.
HER2/neu protein is a receptor tyrosine kinase that is normally involved in cell growth and division. However, in some cancers, the HER2/neu gene is overexpressed or mutated, leading to an overproduction of the protein. This can cause cells to grow and divide uncontrollably, leading to tumor formation.