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NCI Dictionary of Cancer Terms

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indium In 111 anti-CEA monoclonal antibody M5A  listen  (IN-dee-um … MAH-noh-KLOH-nul AN-tee-BAH-dee …)

  A substance being studied in the imaging of some types of cancer. M5A is a monoclonal antibody that binds to a protein called CEA on the surface of some tumor cells. It is linked to a radioisotope called indium In 111. The combined substance is injected into the blood, and a machine is used to find cells in the body that bind to it. Indium In 111 anti-CEA monoclonal antibody M5A is a type of radioimmunoconjugate.