As an antibody with reduced fucose content, obinutuzumab induces greater ADCC activity than
rituximab in vitro using human cancer cell lines. Obinutuzumab also demonstrated an increased
ability to induce direct cell death when compared to rituximab. Obinutuzumab binds to FcγRIII
using purified proteins with a higher affinity than rituximab. Obinutuzumab and rituximab bind
with similar affinity to overlapping epitopes on CD20.