A laboratory test that uses antibodies to test for certain antigens in a sample of tissue. The antibody is usually linked to a radioactive substance or a dye that causes the antigens in the tissue to light up under a microscope. Immunohistochemistry is used to help diagnose diseases, such as cancer. It may also be used to help tell the difference between different types of cancer.
Source: NCI Dictionary of Cancer Terms2009-09-30 Date last modified: 2014-03-25