Ertumaxomab (trade name Rexomun) is a rat-murine hybrid monoclonal antibody designed to treat some types of cancer.

It is a trifunctional antibody which works by linking T-lymphocytes and macrophages to the cancer cells.[1]

Phase II clinical trial evaluating the treatment of breast cancer was terminated due to change in Fresenius' development plans.[2] (So they could concentrate on their other product catumaxomab (trade name Removab).[3]: 35 )

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