The process of analyzing cells or tissues to look for genetic changes that may be a sign of a disease or condition, such as cancer. These changes may be a sign that a person has an increased risk of developing a specific disease or condition. Genetic testing may also be done on tumor tissue to help diagnose cancer, plan treatment, or find out how well treatment is working.
Last updated: 2017-11-08
Source: The National Cancer Institute's Dictionary of Cancer Terms (http://www.cancer.gov/dictionary)