KI-67

KI-67 is a protein found in the nucleus of cells that serves as a key marker for cell proliferation. This protein is present during all active phases of the cell cycle but is absent in resting (non-dividing) cells, making it a valuable indicator of cell growth. In clinical settings, KI-67 is commonly used in pathology to assess the growth rate of tumors. By measuring the proportion of KI-67-positive cells in a tissue sample, doctors can determine how quickly a tumor is likely to grow and spread. This information is crucial for diagnosing cancer, predicting outcomes, and planning effective treatment strategies, including chemotherapy and radiation therapy. The KI-67 index helps provide a clearer picture of tumor aggressiveness and patient prognosis.