patritumab patritumab patritumab (inn) is a human monoclonal antibody designed for the treatment of cancer. it acts as an immunomodulator. patritumabmonoclonal antibodytypewhole antibodysourcehumantargether3clinical dataatc codenoneidentifierscas number1262787-83-6chemspidernoneunii86780vji1qkeggd12185 clinical trials it is in a phase 2 clinical trial for squamous cell cancer of the head and neck. it is to be included in a new arm of the i-spy 2 breast cancer trial.