Keytruda is classified as a monoclonal antibody. Monoclonal antibodies are a relatively new type of âtargetedâ cancer therapy. Antibodies are an integral part of the bodyâs immune system. Normally, the body creates antibodies in response to an antigen (such as a protein in a germ) that has entered the body. The antibodies attach to the antigen in order to mark it for destruction by the immune system.
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