HER2 Status

HER2 status refers to whether a breast cancer tumor has high levels of a protein called HER2 (human epidermal growth factor receptor 2) on its surface. HER2 helps cells grow and divide, and when it's overproduced, the cancer can grow more aggressively. Testing determines if the tumor is HER2-positive (high levels), negative (normal levels), or equivocal. This information guides treatment, as HER2-positive cancers often respond well to targeted therapies specifically designed to block this protein, improving outcomes. Understanding HER2 status is essential for personalized treatment planning in breast cancer management.