In co-culture of human blood cells and human CEACAM5+ gastric cancer cells, it was shown to induce phagocytosis activity, associated with increased activation/maturation of both monocytes and dendritic cells. Tusamitamab R848 ADC evaluated in vivo in CEACAM5+ pancreatic human tumor model, HPAFII, leads to robust antitumor activity with complete regressions (CR) after single administration at 5 mg/kg....Based on preclinical in vitro and in vivo data, the tusamitamab R848 ADC is an innovative ADC approach with the potential to eradicate CEACAM5+ tumors in patients.