NCIt definition : An immunoconjugate consisting of a humanized monoclonal antibody against the tumor-associated
sialoglycotope CA6 (huDS6) conjugated to the cytotoxic maytansinoid DM4, with potential
antineoplastic activity. The anti-CA6 monoclonal antibody moiety of SAR566658 targets
and binds to the cell surface antigen CA6. Upon antibody/antigen binding and internalization,
the immunoconjugate releases DM4, which binds to tubulin and disrupts microtubule
assembly/disassembly dynamics, resulting in inhibition of cell division and cell growth
of CA6-expressing tumor cells. The CA6 epitope is found on a variety of solid tumors,
including breast, ovarian, cervical, lung and pancreatic tumors.;