Citatuzumab bogatox (VB6-845) is recombinant immunotoxin that composed of Fab fragment of humanized antibody targeting EpCAM and a modified cytotoxin bouganin. Citatuzumab bogatox binds to and selectively induces apoptosis in EpCAM-positive cell lines and shows good activity in EpCAM-positive human tumour xenograft models[1][2][3].