NCI Dictionary of Cancer Terms
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monoclonal antibody (MAH-noh-KLOH-nul AN-tee-BAH-dee)
A type of protein made in the laboratory that can bind to substances in the body, including cancer cells. There are many kinds of monoclonal antibodies. A monoclonal antibody is made so that it binds to only one substance. Monoclonal antibodies are being used to treat some types of cancer. They can be used alone or to carry drugs, toxins, or radioactive substances directly to cancer cells.