Her2 Testing In Breast Cancer
Understanding HER2 HER2 proteins occur on the surface of breast cells, whether cancerous or normal. A gene we all have (HER2 or ERBB2) carries the instructions or blueprint for manufacturing these proteins. Each cell contains two copies of the gene. When there are extra copies of this gene (HER2 amplification) the result is an increased number of HER2 receptors on the surface of breast cells (HER2 overexpression). While normal breast cells have these receptors, HER2-positive breast cancer cells have up to 100 times as many....