The aim of our study was to determine in vitro the kinetics of the cell uptake of radiolabelled monoclonal antibody a,b,c,e-(NHCSNH-PhCH2PO(OH)CH2-DO3A)2-3 (AntiCD66) radiolabelled with 111In usable for radioimmunoscintigraphy and with 90Y utilizable for radioimmunotherapy.