A substance being studied in the treatment of some types of cancer. M5A is a monoclonal antibody that binds to a protein called CEA, which is found on some cancer cells. It is linked to a radioactive substance called yttrium Y 90, which may help kill cancer cells. Yttrium Y 90-DOTA anti-CEA monoclonal antibody M5A is a type of radioimmunoconjugate.
Source: NCI Dictionary of Cancer Terms
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