Asubstance being studied in the imaging of some types ofcancer. M5A is a monoclonal antibody that binds to aprotein called CEA on the surface of some tumor cells. Itis linked to a radioisotope called indium In 111. Thecombined substance is injected into the blood, and amachine is used to find cells in the body that bind to it.Indium In 111 anti-CEA monoclonal antibody M5A is a type ofradioimmunoconjugate.
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