The treatment of cancer remains a formidable challenge owing to the difficulties in differentiating tumor from non-tumor cells in order to ameliorate the disease without causing intolerable toxicity to human patients. The use of monoclonal antibodies (mAbs) represents an attractive approach of overcoming this problem as the mAbs can be designed to selectively target tumor cells and elicit a variety of responses once bound. However, when rodent mAbs are administered in humans, anti-antibody responses are frequently observed. Hence, humanized monoclonal antibodies are instead widely used for...