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NCI Dictionary of Cancer Terms

B3 monoclonal antibody  listen  (… MAH-noh-KLOH-nul AN-tee-BAH-dee)

  A substance that binds to a molecule called Lewis Y antigen that is found on many types of tumor cells and some normal cells. It is being studied in the treatment of several types of cancer that express the Lewis Y antigen. It is a type of monoclonal antibody.